Patent Grant
11970739
This application contains a Sequence Listing that has been submitted electronically as an XML file named 47706-0307002.xml. The XML file, created on Jul. 6, 2023, is 15000 bytes in size. The material in the XML file is hereby incorporated by reference in its entirety.
Cells within a tissue of a subject have differences in cell morphology and/or function due to varied analyte levels (e.g., gene and/or protein expression) within the different cells. The specific position of a cell within a tissue (e.g., the cell's position relative to neighboring cells or the cell's position relative to the tissue microenvironment) can affect, e.g., the cell's morphology, differentiation, fate, viability, proliferation, behavior, and signaling and cross-talk with other cells in the tissue.
Spatial heterogeneity has been previously studied using techniques that only provide data for a small handful of analytes in the context of an intact tissue or a portion of a tissue, or provides substantial analyte data for dissociated tissue (i.e., single cells), but fail to provide information regarding the position of the single cell in a parent biological sample (e.g., tissue sample).
Moreover, multiplex detection of different analytes (e.g., nucleic acid, protein, etc.) in the same biological sample, while preserving spatial information remains a challenge in the field. Current methods include transcriptome wide spatial detection or various protein detection methods, however, methods that accomplish both within the spatial context of a biological sample are still needed.
Multiplex detection of different analytes (e.g., nucleic acid, protein, etc.) in the same biological sample, while preserving spatial information remains a challenge in the field. As described above, current methods include transcriptome wide spatial detection or various protein detection methods, including immunofluorescence, however, methods that detect both spatial gene expression and spatial protein expression within the spatial context of a biological sample simultaneously are still needed.
Provided herein are methods for determining the spatial location of a nucleic acid and a protein from a biological sample including: a) providing a spatial array including a first and second plurality of capture probes where each plurality includes a spatial barcode and a capture domain, b) contacting the spatial array with a biological sample, c) contacting the biological sample with (i) a plurality of analyte capture agents, where an analyte capture agent includes an analyte binding moiety and an oligonucleotide including an analyte binding moiety barcode and an analyte capture sequence, where the analyte capture sequence includes a sequence complementary to a second plurality of capture domains, and (ii) a plurality of templated ligation probes, where one of the templated ligation probes includes a sequence complementary a first plurality of capture domains, d) binding the analyte binding moiety of the analyte capture agent to a target protein, e) hybridizing the templated ligation probes to a target nucleic acid and ligating the probes to produce ligation products, f) hybridizing the ligation products to the first plurality of capture domains and the analyte capture sequences of the bound analyte capture agents to the second plurality of capture domains on the spatial array, and g) determining the sequence or a portion thereof of a captured ligation product, or a complement thereof, and the sequence of the spatial barcode of the capture probe, or a complement thereof, that is associated with the ligation product, and the sequence of the analyte binding moiety barcode, or a complement thereof, of the bound analyte capture agent, thereby determining the spatial location of a nucleic acid and the protein from the biological sample.
In some embodiments, the capture domains of the first plurality of capture probes are defined non-homopolymeric capture sequences or homopolymeric sequences. In some embodiments, the capture domains of the second plurality of capture probes are defined non-homopolymeric sequences or homopolymeric capture sequences. In some embodiments, capture domains of the first plurality of capture probes are different from the capture domains of the second plurality of capture probes. In some embodiments, homopolymeric sequence includes a polyT sequence and the non-homopolymeric sequence includes a fixed sequence or a degenerate sequence. In some embodiments, the fixed sequence includes at least one sequence selected from SEQ ID NO: 1 through SEQ ID NO: 11.
In some embodiments, the nucleic acid is a RNA or DNA. In some embodiments, the RNA is a mRNA.
In some embodiments, the biological sample is a tissue sample. In some embodiments, tissue sample is a fresh-frozen tissue sample or a fixed tissue sample, where the fixed tissue sample is a formalin-fixed tissue sample, an acetone fixed tissue sample, a paraformaldehyde tissue sample, or a methanol fixed tissue sample. In some embodiments, the biological sample is a tissue section, where the tissue section is a fresh-frozen tissue section or a fixed section, and optionally, where the fixed tissue section is a formalin-fixed paraffin-embedded tissue section, an acetone fixed tissue section, a paraformaldehyde tissue section, or a methanol fixed tissue section. In some embodiments, the tissue sample is derived from a biopsy sample or a whole rodent embryo.
In some embodiments, before step (b) the biological sample is deparaffinized and decrosslinked. In some embodiments, the decrosslinking includes the use of a buffer. In some embodiments, the buffer includes Tris-EDTA buffer at a pH from about 8 to about 10 and a temperature from about 60° C. to about 80° C. In some embodiments, the buffer includes citrate buffer at a pH from about 5 to about 7 and a temperature from about 70° C. to about 100° C.
In some embodiments, the hybridizing the templated ligation products and the analyte capture sequences of the bound analyte capture agents includes permeabilizing the biological sample.
In some embodiments, the analyte capture sequence of the oligonucleotide is blocked prior to binding to the target protein. In some embodiments, the oligonucleotide of the analyte capture agent is blocked by a blocking probe. In some embodiments, the blocking probe is removed prior to hybridizing the analyte capture sequence of the oligonucleotide of the analyte capture sequence to the capture domain of the capture probe.
In some embodiments, the determining in step (g) includes: a) extending the captured ligation products and the captured oligonucleotides of the analyte capture agents, where the extension products include the spatial barcode or a complement thereof, b) releasing the extension products, or complements thereof, from the spatial array, c) producing a library from the released extension products or complements thereof, and d) sequencing the library.
In some embodiments, prior to step (c) the method includes pre-amplifying the extension products, or complements thereof.
In some embodiments, the complement of the oligonucleotide of the analyte capture agent includes an analyte binding moiety barcode specific to the analyte binding moiety of the analyte capture agent.
In some embodiments, the first and second plurality of capture probes include a cleavage domain, one or more functional domains, a unique molecular identifier, and combinations thereof.
In some embodiments, the method includes imaging the biological sample. In some embodiments, the imaging includes one or more of expansion microscopy, bright field microscopy, dark field microscopy, phase contrast microscopy, electron microscopy, fluorescence microscopy, reflection microscopy, interference microscopy and confocal microscopy.
In some embodiments, the method includes staining the biological sample. In some embodiments, the staining includes hematoxylin and eosin. In some embodiments, the staining includes the use of a detectable label selected from the group consisting of a radioisotope, a fluorophore, a chemiluminescent compound, a bioluminescent compound, or a combination thereof.
In some embodiments, the spatial array includes one or more protein dilution series.
Also provided herein are spatial array including: a) a plurality of capture probes including spatial barcodes and a first plurality of capture domains hybridized to a plurality of templated ligation products, and b) a plurality of capture probes including spatial barcodes and a second plurality of capture domains hybridized to a plurality of oligonucleotides from analyte capture agents, where the oligonucleotides include an analyte capture sequence and an analyte binding moiety barcode.
In some embodiments, the capture probes include cleavage domains, unique molecular identifiers, one or more functional sequences, or a combination thereof.
In some embodiments, the first plurality of capture domains are homopolymeric sequences or defined non-homopolymeric sequences. In some embodiments, the second plurality of capture domains are homopolymeric sequences or defined non-homopolymeric sequences. In some embodiments, the first plurality of capture domains are poly(T) sequences. In some embodiments, the spatial array includes one or more protein dilution series.
Also provided herein are kit including: a) a spatial array including a plurality of capture probes, where the capture probes include spatial barcodes and where the plurality of capture probes include a first plurality of first capture domains and a second plurality of second capture domains, b) one or more analyte capture agents, c) one or more nucleic acid templated ligation probe pairs, and d) one or more enzymes and buffers for practicing any of the methods described herein.
Also provided herein are methods for determining the spatial location of a nucleic acid and a protein in a diseased biological sample including: a) providing a spatial array including a first and a second plurality of capture probes where each plurality includes a spatial barcode and a capture domain, b) contacting the diseased biological sample with the spatial array, c) contacting the diseased biological sample with: (i) a plurality of analyte capture agents, where an analyte capture agent includes an analyte binding moiety and an oligonucleotide including an analyte binding moiety barcode and an analyte capture sequence, where the analyte capture sequence includes a sequence complementary to a second plurality of capture domains, and (ii) a plurality of templated ligation probes, where one of the templated ligation probes includes a sequence complementary a first plurality of capture domains, d) binding the analyte binding moiety of the analyte capture agent to a target protein, e) hybridizing the templated ligation probes to a target RNA and ligating the probes to produce templated ligation products, f) hybridizing the templated ligation products to the first plurality of capture domains and the analyte capture sequences of the bound analyte capture agents to the second plurality of capture domains on the spatial array, and g) determining the sequence or a portion thereof of a captured ligation product, or a complement, and the sequence of the spatial barcode of the capture probe, or a complement thereof, that is associated with the ligation product, and the sequence of the analyte binding moiety barcode, or a complement thereof, of the bound analyte capture agent, thereby determining the spatial location of a nucleic acid and the protein in the diseased biological sample.
In some embodiments, the diseased biological sample is a cancerous biological sample. In some embodiments, the cancerous biological sample is an ovarian cancer biological sample, a breast cancer biological sample, a lung cancer biological sample, or a melanoma. In some embodiments, the breast cancer sample is triple positive breast cancer or a ductal cell invasive carcinoma sample.
All publications, patents, and patent applications mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent, patent application, or item of information was specifically and individually indicated to be incorporated by reference. To the extent publications, patents, patent applications, and items of information incorporated by reference contradict the disclosure contained in the specification, the specification is intended to supersede and/or take precedence over any such contradictory material.
Where values are described in terms of ranges, it should be understood that the description includes the disclosure of all possible sub-ranges within such ranges, as well as specific numerical values that fall within such ranges irrespective of whether a specific numerical value or specific sub-range is expressly stated.
The term “each,” when used in reference to a collection of items, is intended to identify an individual item in the collection but does not necessarily refer to every item in the collection, unless expressly stated otherwise, or unless the context of the usage clearly indicates otherwise.
Various embodiments of the features of this disclosure are described herein. However, it should be understood that such embodiments are provided merely by way of example, and numerous variations, changes, and substitutions can occur to those skilled in the art without departing from the scope of this disclosure. It should also be understood that various alternatives to the specific embodiments described herein are also within the scope of this disclosure.
The following drawings illustrate certain embodiments of the features and advantages of this disclosure. These embodiments are not intended to limit the scope of the appended claims in any manner. Like reference symbols in the drawings indicate like elements.
The present disclosure features methods, compositions, and kits for spatial analysis of biological samples. More specifically, the present disclosure features methods, compositions, and kits for both spatial gene expression and spatial protein expression in a biological sample.
Spatial analysis methodologies and compositions described herein can provide a vast amount of analyte and/or expression data for a variety of analytes within a biological sample at high spatial resolution, while retaining native spatial context. Spatial analysis methods and compositions can include, e.g., the use of a capture probe including a spatial barcode (e.g., a nucleic acid sequence that provides information as to the location or position of an analyte within a cell or a tissue sample (e.g., mammalian cell or a mammalian tissue sample) and a capture domain that is capable of binding to an analyte (e.g., a protein and/or a nucleic acid) produced by and/or present in a cell. Spatial analysis methods and compositions can also include the use of a capture probe having a capture domain that captures an intermediate agent for indirect detection of an analyte. For example, the intermediate agent can include a nucleic acid sequence (e.g., a barcode) associated with the intermediate agent. Detection of the intermediate agent is therefore indicative of the analyte in the cell or tissue sample.
Non-limiting aspects of spatial analysis methodologies and compositions are described in U.S. Pat. Nos. 10,774,374, 10,724,078, 10,480,022, 10,059,990, 10,041,949, 10,002,316, 9,879,313, 9,783,841, 9,727,810, 9,593,365, 8,951,726, 8,604,182, 7,709,198, U.S. Patent Application Publication Nos. 2020/239946, 2020/080136, 2020/0277663, 2020/024641, 2019/330617, 2019/264268, 2020/256867, 2020/224244, 2019/194709, 2019/161796, 2019/085383, 2019/055594, 2018/216161, 2018/051322, 2018/0245142, 2017/241911, 2017/089811, 2017/067096, 2017/029875, 2017/0016053, 2016/108458, 2015/000854, 2013/171621, WO 2018/091676, WO 2020/176788, Rodrigues et al., Science 363(6434):1463-1467, 2019; Lee et al., Nat. Protoc. 10(3):442-458, 2015; Trejo et al., PLoS ONE 14(2):e0212031, 2019; Chen et al., Science 348(6233):aaa6090, 2015; Gao et al., BMC Biol. 15:50, 2017; and Gupta et al., Nature Biotechnol. 36:1197-1202, 2018; the Visium Spatial Gene Expression Reagent Kits User Guide (e.g., Rev C, dated June 2020), and/or the Visium Spatial Tissue Optimization Reagent Kits User Guide (e.g., Rev C, dated July 2020), both of which are available at the 10x Genomics Support Documentation website, and can be used herein in any combination, and each of which is incorporated herein by reference in their entireties. Further non-limiting aspects of spatial analysis methodologies and compositions are described herein.
Some general terminology that may be used in this disclosure can be found in Section (I)(b) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663. Typically, a “barcode” is a label, or identifier, that conveys or is capable of conveying information (e.g., information about an analyte in a sample, a bead, and/or a capture probe). A barcode can be part of an analyte, or independent of an analyte. A barcode can be attached to an analyte. A particular barcode can be unique relative to other barcodes. For the purpose of this disclosure, an “analyte” can include any biological substance, structure, moiety, or component to be analyzed. The term “target” can similarly refer to an analyte of interest.
Analytes can be broadly classified into one of two groups: nucleic acid analytes, and non-nucleic acid analytes. Examples of non-nucleic acid analytes include, but are not limited to, lipids, carbohydrates, peptides, proteins, glycoproteins (N-linked or O-linked), lipoproteins, phosphoproteins, specific phosphorylated or acetylated variants of proteins, amidation variants of proteins, hydroxylation variants of proteins, methylation variants of proteins, ubiquitylation variants of proteins, sulfation variants of proteins, viral proteins (e.g., viral capsid, viral envelope, viral coat, viral accessory, viral glycoproteins, viral spike, etc.), extracellular and intracellular proteins, antibodies, and antigen binding fragments. In some embodiments, the analyte(s) can be localized to subcellular location(s), including, for example, organelles, e.g., mitochondria, Golgi apparatus, endoplasmic reticulum, chloroplasts, endocytic vesicles, exocytic vesicles, vacuoles, lysosomes, etc. In some embodiments, analyte(s) can be peptides or proteins, including without limitation antibodies and enzymes. Additional examples of analytes can be found in Section (I)(c) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663. In some embodiments, an analyte can be detected indirectly, such as through detection of an intermediate agent, for example, a ligation product or an analyte capture agent (e.g., an oligonucleotide-conjugated antibody), such as those described herein.
A “biological sample” is typically obtained from the subject for analysis using any of a variety of techniques including, but not limited to, biopsy, surgery, and laser capture microscopy (LCM), and generally includes cells and/or other biological material from the subject. In some embodiments, a biological sample can be a tissue section. In some embodiments, a biological sample can be a fixed and/or stained biological sample (e.g., a fixed and/or stained tissue section). Non-limiting examples of stains include histological stains (e.g., hematoxylin and/or eosin) and immunological stains (e.g., fluorescent stains). In some embodiments, a biological sample (e.g., a fixed and/or stained biological sample) can be imaged. Biological samples are also described in Section (I)(d) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663.
In some embodiments, a biological sample is permeabilized with one or more permeabilization reagents. For example, permeabilization of a biological sample can facilitate analyte capture. Exemplary permeabilization agents and conditions are described in Section (I)(d)(ii)(13) or the Exemplary Embodiments Section of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663.
Array-based spatial analysis methods involve the transfer of one or more analytes from a biological sample to an array of features on a substrate, where each feature is associated with a unique spatial location on the array. Subsequent analysis of the transferred analytes includes determining the identity of the analytes and the spatial location of the analytes within the biological sample. The spatial location of an analyte within the biological sample is determined based on the feature to which the analyte is bound (e.g., directly or indirectly) on the array, and the feature's relative spatial location within the array.
A “capture probe” refers to any molecule capable of capturing (directly or indirectly) and/or labelling an analyte (e.g., an analyte of interest) in a biological sample. In some embodiments, the capture probe is a nucleic acid or a polypeptide. In some embodiments, the capture probe includes a barcode (e.g., a spatial barcode and/or a unique molecular identifier (UMI)) and a capture domain). In some embodiments, a capture probe can include a cleavage domain and/or a functional domain (e.g., a primer-binding site, such as for next-generation sequencing (NGS)). See, e.g., Section (II)(b) (e.g., subsections (i)-(vi)) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663. Generation of capture probes can be achieved by any appropriate method, including those described in Section (II)(d)(ii) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663.
The functional sequences can generally be selected for compatibility with any of a variety of different sequencing systems, e.g., Ion Torrent Proton or PGM, Illumina sequencing instruments, PacBio, Oxford Nanopore, etc., and the requirements thereof. In some embodiments, functional sequences can be selected for compatibility with non-commercialized sequencing systems. Examples of such sequencing systems and techniques, for which suitable functional sequences can be used, include (but are not limited to) Ion Torrent Proton or PGM sequencing, Illumina sequencing, PacBio SMRT sequencing, and Oxford Nanopore sequencing. Further, in some embodiments, functional sequences can be selected for compatibility with other sequencing systems, including non-commercialized sequencing systems.
In some embodiments, the spatial barcode 105 and functional sequences 104 is common to all of the probes attached to a given feature. In some embodiments, the UMI sequence 106 of a capture probe attached to a given feature is different from the UMI sequence of a different capture probe attached to the given feature.
In some embodiments, more than one analyte type (e.g., nucleic acids and proteins) from a biological sample can be detected (e.g., simultaneously or sequentially) using any appropriate multiplexing technique, such as those described in Section (IV) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663.
In some embodiments, detection of one or more analytes (e.g., protein analytes) can be performed using one or more analyte capture agents. As used herein, an “analyte capture agent” refers to an agent that interacts with an analyte (e.g., an analyte in a biological sample) and with a capture probe (e.g., a capture probe attached to a substrate or a feature) to identify the analyte. In some embodiments, the analyte capture agent includes: (i) an analyte binding moiety (e.g., that binds to an analyte), for example, an antibody or antigen-binding fragment thereof; (ii) analyte binding moiety barcode; and (iii) an analyte capture sequence. In some embodiments, the analyte capture agent includes a capture agent barcode domain that is conjugated or otherwise attached to the analyte binding moiety. In some embodiments, the capture agent barcode domain is covalently-linked to the analyte binding moiety. In some embodiments, a capture agent barcode domain is a nucleic acid sequence. In some embodiments, a capture agent barcode domain includes an analyte binding moiety barcode and an analyte capture sequence.
In some embodiments, analyte capture agents are capable of binding to analytes present inside a cell. In some embodiments, analyte capture agents are capable of binding to cell surface analytes that can include, without limitation, a receptor, an antigen, a surface protein, a transmembrane protein, a cluster of differentiation protein, a protein channel, a protein pump, a carrier protein, a phospholipid, a glycoprotein, a glycolipid, a cell-cell interaction protein complex, an antigen-presenting complex, a major histocompatibility complex, an engineered T-cell receptor, a T-cell receptor, a B-cell receptor, a chimeric antigen receptor, an extracellular matrix protein, a posttranslational modification (e.g., phosphorylation, glycosylation, ubiquitination, nitrosylation, methylation, acetylation or lipidation) state of a cell surface protein, a gap junction, and an adherens junction. In some embodiments, the analyte capture agents are capable of binding to cell surface analytes that are post-translationally modified. In such embodiments, analyte capture agents can be specific for cell surface analytes based on a given state of posttranslational modification (e.g., phosphorylation, glycosylation, ubiquitination, nitrosylation, methylation, acetylation or lipidation), such that a cell surface analyte profile can include posttranslational modification information of one or more analytes.
As used herein, the term “analyte binding moiety” refers to a molecule or moiety capable of binding to a macromolecular constituent (e.g., an analyte, e.g., a biological analyte). In some embodiments of any of the spatial profiling methods described herein, the analyte binding moiety of the analyte capture agent that binds to a biological analyte can include, but is not limited to, an antibody, or an epitope binding fragment thereof, a cell surface receptor binding molecule, a receptor ligand, a small molecule, a bi-specific antibody, a bi-specific T-cell engager, a T-cell receptor engager, a B-cell receptor engager, a pro-body, an aptamer, a monobody, an affimer, a darpin, and a protein scaffold, or any combination thereof. The analyte binding moiety can bind to the macromolecular constituent (e.g., analyte) with high affinity and/or with high specificity. The analyte binding moiety can include a nucleotide sequence (e.g., an oligonucleotide), which can correspond to at least a portion or an entirety of the analyte binding moiety. The analyte binding moiety can include a polypeptide and/or an aptamer (e.g., a polypeptide and/or an aptamer that binds to a specific target molecule, e.g., an analyte). The analyte binding moiety can include an antibody or antibody fragment (e.g., an antigen-binding fragment) that binds to a specific analyte (e.g., a polypeptide).
In some embodiments, an analyte binding moiety of an analyte capture agent includes one or more antibodies or antigen binding fragments thereof. The antibodies or antigen binding fragments including the analyte binding moiety can specifically bind to a target analyte. In some embodiments, the analyte is a protein (e.g., a protein on a surface of the biological sample (e.g., a cell) or an intracellular protein). In some embodiments, a plurality of analyte capture agents comprising a plurality of analyte binding moieties bind a plurality of analytes present in a biological sample. In some embodiments, the plurality of analytes includes a single species of analyte (e.g., a single species of polypeptide). In some embodiments in which the plurality of analytes includes a single species of analyte, the analyte binding moieties of the plurality of analyte capture agents are the same. In some embodiments in which the plurality of analytes includes a single species of analyte, the analyte binding moieties of the plurality of analyte capture agents are the different (e.g., members of the plurality of analyte capture agents can have two or more species of analyte binding moieties, wherein each of the two or more species of analyte binding moieties binds a single species of analyte, e.g., at different binding sites). In some embodiments, the plurality of analytes includes multiple different species of analyte (e.g., multiple different species of polypeptides).
As used herein, the term “analyte binding moiety barcode” refers to a barcode that is associated with or otherwise identifies the analyte binding moiety. In some cases, an analyte binding moiety barcode (or portion thereof) may be able to be removed (e.g., cleaved) from the analyte capture agent. In some embodiments, by identifying an analyte binding moiety and its associated analyte binding moiety barcode, the analyte to which the analyte binding moiety binds can also be identified. An analyte binding moiety barcode can be a nucleic acid sequence of a given length and/or sequence that is associated with the analyte binding moiety. An analyte binding moiety barcode can generally include any of the variety of aspects of barcodes described herein. For example, an analyte capture agent that is specific to one type of analyte can have coupled thereto a first capture agent barcode domain (e.g., that includes a first analyte binding moiety barcode), while an analyte capture agent that is specific to a different analyte can have a different capture agent barcode domain (e.g., that includes a second barcode analyte binding moiety barcode) coupled thereto. In some aspects, such a capture agent barcode domain can include an analyte binding moiety barcode that permits identification of the analyte binding moiety to which the capture agent barcode domain is coupled. The selection of the capture agent barcode domain can allow significant diversity in terms of sequence, while also being readily attachable to most analyte binding moieties (e.g., antibodies or aptamers) as well as being readily detected, (e.g., using sequencing or array technologies). Additional description of analyte capture agents can be found in Section (II)(b)(ix) of WO 2020/176788 and/or Section (II)(b)(viii) U.S. Patent Application Publication No. 2020/0277663.
In some embodiments, the capture agent barcode domain of an analyte capture agent includes an analyte capture sequence. As used herein, the term “analyte capture sequence” refers to a region or moiety configured to hybridize to, bind to, couple to, or otherwise interact with a capture domain of a capture probe. In some embodiments, an analyte capture sequence includes a nucleic acid sequence that is complementary to or substantially complementary to the capture domain of a capture probe such that the analyte capture sequence hybridizes to the capture domain of the capture probe. In some embodiments, an analyte capture sequence comprises a poly(A) nucleic acid sequence that hybridizes to a capture domain that comprises a poly(T) nucleic acid sequence. In some embodiments, an analyte capture sequence comprises a poly(T) nucleic acid sequence that hybridizes to a capture domain that comprises a poly(A) nucleic acid sequence. In some embodiments, an analyte capture sequence comprises a non-homopolymeric nucleic acid sequence that hybridizes to a capture domain that comprises a non-homopolymeric nucleic acid sequence that is complementary (or substantially complementary) to the non-homopolymeric nucleic acid sequence of the analyte capture region.
There are at least two methods to associate a spatial barcode with one or more neighboring cells, such that the spatial barcode identifies the one or more cells, and/or contents of the one or more cells, as associated with a particular spatial location. One method is to promote analytes or analyte proxies (e.g., intermediate agents) out of a cell and towards a spatially-barcoded array (e.g., including spatially-barcoded capture probes). Another method is to cleave spatially-barcoded capture probes from an array and promote the spatially-barcoded capture probes towards and/or into or onto the biological sample.
In some cases, capture probes may be configured to prime, replicate, and consequently yield optionally barcoded extension products from a template (e.g., a DNA or RNA template, such as an analyte or an intermediate agent (e.g., a ligation product or an analyte capture agent), or a portion thereof), or derivatives thereof (see, e.g., Section (II)(b)(vii) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663 regarding extended capture probes). In some cases, capture probes may be configured to form ligation products with a template (e.g., a DNA or RNA template, such as an analyte or an intermediate agent, or portion thereof), thereby creating ligations products that serve as proxies for a template.
As used herein, an “extended capture probe” refers to a capture probe having additional nucleotides added to the terminus (e.g., 3′ or 5′ end) of the capture probe thereby extending the overall length of the capture probe. For example, an “extended 3′ end” indicates additional nucleotides were added to the most 3′ nucleotide of the capture probe to extend the length of the capture probe, for example, by polymerization reactions used to extend nucleic acid molecules including templated polymerization catalyzed by a polymerase (e.g., a DNA polymerase or a reverse transcriptase). In some embodiments, extending the capture probe includes adding to a 3′ end of a capture probe a nucleic acid sequence that is complementary to a nucleic acid sequence of an analyte or intermediate agent specifically bound to the capture domain of the capture probe. In some embodiments, the capture probe is extended using reverse transcription. In some embodiments, the capture probe is extended using one or more DNA polymerases. The extended capture probes include the sequence of the capture probe and the sequence of the spatial barcode of the capture probe.
In some embodiments, extended capture probes are amplified (e.g., in bulk solution or on the array) to yield quantities that are sufficient for downstream analysis, e.g., via DNA sequencing. In some embodiments, extended capture probes (e.g., DNA molecules) act as templates for an amplification reaction (e.g., a polymerase chain reaction).
Additional variants of spatial analysis methods, including in some embodiments, an imaging step, are described in Section (II)(a) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663. Analysis of captured analytes (and/or intermediate agents or portions thereof), for example, including sample removal, extension of capture probes, sequencing (e.g., of a cleaved extended capture probe and/or a cDNA molecule complementary to an extended capture probe), sequencing on the array (e.g., using, for example, in situ hybridization or in situ ligation approaches), temporal analysis, and/or proximity capture, is described in Section (II)(g) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663. Some quality control measures are described in Section (II)(h) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663.
Spatial information can provide information of biological and/or medical importance. For example, the methods and compositions described herein can allow for: identification of one or more biomarkers (e.g., diagnostic, prognostic, and/or for determination of efficacy of a treatment) of a disease or disorder; identification of a candidate drug target for treatment of a disease or disorder; identification (e.g., diagnosis) of a subject as having a disease or disorder; identification of stage and/or prognosis of a disease or disorder in a subject; identification of a subject as having an increased likelihood of developing a disease or disorder; monitoring of progression of a disease or disorder in a subject; determination of efficacy of a treatment of a disease or disorder in a subject; identification of a patient subpopulation for which a treatment is effective for a disease or disorder; modification of a treatment of a subject with a disease or disorder; selection of a subject for participation in a clinical trial; and/or selection of a treatment for a subject with a disease or disorder.
Exemplary methods for identifying spatial information of biological and/or medical importance can be found in U.S. Patent Application Publication No. 2021/0140982A1, U.S. Patent Application No. 2021/0198741A1, and/or U.S. Patent Application No. 2021/0199660.
Spatial information can provide information of biological importance. For example, the methods and compositions described herein can allow for: identification of transcriptome and/or proteome expression profiles (e.g., in healthy and/or diseased tissue); identification of multiple analyte types in close proximity (e.g., nearest neighbor analysis); determination of up- and/or down-regulated genes and/or proteins in diseased tissue; characterization of tumor microenvironments; characterization of tumor immune responses; characterization of cells types and their co-localization in tissue; and identification of genetic variants within tissues (e.g., based on gene and/or protein expression profiles associated with specific disease or disorder biomarkers).
Typically, for spatial array-based methods, a substrate functions as a support for direct or indirect attachment of capture probes to features of the array. A “feature” is an entity that acts as a support or repository for various molecular entities used in spatial analysis. In some embodiments, some or all of the features in an array are functionalized for analyte capture. Exemplary substrates are described in Section (II)(c) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663. Exemplary features and geometric attributes of an array can be found in Sections (II)(d)(i), (II)(d)(iii), and (II)(d)(iv) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663.
Generally, analytes and/or intermediate agents (or portions thereof) can be captured when contacting a biological sample with a substrate including capture probes (e.g., a substrate with capture probes embedded, spotted, printed, fabricated on the substrate, or a substrate with features (e.g., beads, wells) comprising capture probes). As used herein, “contact,” “contacted,” and/or “contacting,” a biological sample with a substrate refers to any contact (e.g., direct or indirect) such that capture probes can interact (e.g., bind covalently or non-covalently (e.g., hybridize)) with analytes from the biological sample. Capture can be achieved actively (e.g., using electrophoresis) or passively (e.g., using diffusion). Analyte capture is further described in Section (II)(e) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663.
In some cases, spatial analysis can be performed by attaching and/or introducing a molecule (e.g., a peptide, a lipid, or a nucleic acid molecule) having a barcode (e.g., a spatial barcode) to a biological sample (e.g., to a cell in a biological sample). In some embodiments, a plurality of molecules (e.g., a plurality of nucleic acid molecules) having a plurality of barcodes (e.g., a plurality of spatial barcodes) are introduced to a biological sample (e.g., to a plurality of cells in a biological sample) for use in spatial analysis. In some embodiments, after attaching and/or introducing a molecule having a barcode to a biological sample, the biological sample can be physically separated (e.g., dissociated) into single cells or cell groups for analysis. Some such methods of spatial analysis are described in Section (III) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663.
In some cases, spatial analysis can be performed by detecting multiple oligonucleotides that hybridize to an analyte. In some instances, for example, spatial analysis can be performed using RNA-templated ligation (RTL). Methods of RTL have been described previously. See, e.g., Credle et al., Nucleic Acids Res. 2017 Aug. 21; 45(14):e128. Typically, RTL includes hybridization of two oligonucleotides to adjacent sequences on an analyte (e.g., an RNA molecule, such as an mRNA molecule). In some instances, the oligonucleotides are DNA molecules. In some instances, one of the oligonucleotides includes at least two ribonucleic acid bases at the 3′ end and/or the other oligonucleotide includes a phosphorylated nucleotide at the 5′ end. In some instances, one of the two oligonucleotides includes a capture domain (e.g., a poly(A) sequence, a non-homopolymeric sequence). After hybridization to the analyte, a ligase (e.g., SplintR ligase) ligates the two oligonucleotides together, creating a ligation product. In some instances, the two oligonucleotides hybridize to sequences that are not adjacent to one another. For example, hybridization of the two oligonucleotides creates a gap between the hybridized oligonucleotides. In some instances, a polymerase (e.g., a DNA polymerase) can extend one of the oligonucleotides prior to ligation. After ligation, the ligation product is released from the analyte. In some instances, the ligation product is released using an endonuclease (e.g., RNAse H). The released ligation product can then be captured by capture probes (e.g., instead of direct capture of an analyte) on an array, optionally amplified, and sequenced, thus determining the location and optionally the abundance of the analyte in the biological sample.
During analysis of spatial information, sequence information for a spatial barcode associated with an analyte is obtained, and the sequence information can be used to provide information about the spatial distribution of the analyte in the biological sample. Various methods can be used to obtain the spatial information. In some embodiments, specific capture probes and the analytes they capture are associated with specific locations in an array of features on a substrate. For example, specific spatial barcodes can be associated with specific array locations prior to array fabrication, and the sequences of the spatial barcodes can be stored (e.g., in a database) along with specific array location information, so that each spatial barcode uniquely maps to a particular array location.
Alternatively, specific spatial barcodes can be deposited at predetermined locations in an array of features during fabrication such that at each location, only one type of spatial barcode is present so that spatial barcodes are uniquely associated with a single feature of the array. Where necessary, the arrays can be decoded using any of the methods described herein so that spatial barcodes are uniquely associated with array feature locations, and this mapping can be stored as described above.
When sequence information is obtained for capture probes and/or analytes during analysis of spatial information, the locations of the capture probes and/or analytes can be determined by referring to the stored information that uniquely associates each spatial barcode with an array feature location. In this manner, specific capture probes and captured analytes are associated with specific locations in the array of features. Each array feature location represents a position relative to a coordinate reference point (e.g., an array location, a fiducial marker) for the array. Accordingly, each feature location has an “address” or location in the coordinate space of the array.
Some exemplary spatial analysis workflows are described in the Exemplary Embodiments section of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663. See, for example, the Exemplary embodiment starting with “In some non-limiting examples of the workflows described herein, the sample can be immersed . . . ” of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663. See also, e.g., the Visium Spatial Gene Expression Reagent Kits User Guide (e.g., Rev C, dated June 2020), and/or the Visium Spatial Tissue Optimization Reagent Kits User Guide (e.g., Rev C, dated July 2020).
In some embodiments, spatial analysis can be performed using dedicated hardware and/or software, such as any of the systems described in Sections (II)(e)(ii) and/or (V) of WO 2020/176788 and/or U.S. Patent Application Publication No. 2020/0277663, or any of one or more of the devices or methods described in Sections Control Slide for Imaging, Methods of Using Control Slides and Substrates for, Systems of Using Control Slides and Substrates for Imaging, and/or Sample and Array Alignment Devices and Methods, Informational labels of WO 2020/123320.
Suitable systems for performing spatial analysis can include components such as a chamber (e.g., a flow cell or sealable, fluid-tight chamber) for containing a biological sample. The biological sample can be mounted for example, in a biological sample holder. One or more fluid chambers can be connected to the chamber and/or the sample holder via fluid conduits, and fluids can be delivered into the chamber and/or sample holder via fluidic pumps, vacuum sources, or other devices coupled to the fluid conduits that create a pressure gradient to drive fluid flow. One or more valves can also be connected to fluid conduits to regulate the flow of reagents from reservoirs to the chamber and/or sample holder.
The systems can optionally include a control unit that includes one or more electronic processors, an input interface, an output interface (such as a display), and a storage unit (e.g., a solid state storage medium such as, but not limited to, a magnetic, optical, or other solid state, persistent, writeable and/or re-writeable storage medium). The control unit can optionally be connected to one or more remote devices via a network. The control unit (and components thereof) can generally perform any of the steps and functions described herein. Where the system is connected to a remote device, the remote device (or devices) can perform any of the steps or features described herein. The systems can optionally include one or more detectors (e.g., CCD, CMOS) used to capture images. The systems can also optionally include one or more light sources (e.g., LED-based, diode-based, lasers) for illuminating a sample, a substrate with features, analytes from a biological sample captured on a substrate, and various control and calibration media.
The systems can optionally include software instructions encoded and/or implemented in one or more of tangible storage media and hardware components such as application specific integrated circuits. The software instructions, when executed by a control unit (and in particular, an electronic processor) or an integrated circuit, can cause the control unit, integrated circuit, or other component executing the software instructions to perform any of the method steps or functions described herein.
In some cases, the systems described herein can detect (e.g., register an image) the biological sample on the array. Exemplary methods to detect the biological sample on an array are described in WO 2021/102003 and/or U.S. patent application Ser. No. 16/951,854, each of which is incorporated herein by reference in their entireties.
Prior to transferring analytes from the biological sample to the array of features on the substrate, the biological sample can be aligned with the array. Alignment of a biological sample and an array of features including capture probes can facilitate spatial analysis, which can be used to detect differences in analyte presence and/or level within different positions in the biological sample, for example, to generate a three-dimensional map of the analyte presence and/or level. Exemplary methods to generate a two- and/or three-dimensional map of the analyte presence and/or level are described in PCT Application No. 2020/053655 and spatial analysis methods are generally described in WO 2021/102039 and/or U.S. patent application Ser. No. 16/951,864, each of which is incorporated herein by reference in their entireties.
In some cases, a map of analyte presence and/or level can be aligned to an image of a biological sample using one or more fiducial markers, e.g., objects placed in the field of view of an imaging system which appear in the image produced, as described in the Substrate Attributes Section, Control Slide for Imaging Section of WO 2020/123320, WO 2021/102005, and/or U.S. patent application Ser. No. 16/951,843, each of which is incorporated herein by reference in their entireties. Fiducial markers can be used as a point of reference or measurement scale for alignment (e.g., to align a sample and an array, to align two substrates, to determine a location of a sample or array on a substrate relative to a fiducial marker) and/or for quantitative measurements of sizes and/or distances.
Multiplex Gene Expression and Protein Analysis
Understanding both gene and protein expression in biological systems can be helpful for gaining insights into normal, developing, and diseased tissues. While single cell RNA-seq (scRNA-seq) makes it possible to obtain high-resolution gene expression measurements, the technique requires cells to be dissociated, thereby losing anatomical and organizational information. Similarly, numerous protein detection techniques are known and can provide spatial information of proteins in a biological sample, however, methods of simultaneously detecting levels of gene expression (e.g., mRNA) of the protein, or even the entire transcriptome are still needed.
Thus, disclosed herein are “multi-omics” approaches that can provide a powerful complement to traditional methodologies, enabling a greater understanding of cellular heterogeneity and organization within biological samples. The combination of protein detection using analyte capture agents on a spatial array allows for the simultaneous examination of protein and gene expression from the same biological sample (e.g., tissue section). For example, an array comprising capture probes (e.g., any of the capture probes described herein) can be contacted with a biological sample, a plurality of templated ligation probes, and a plurality of analyte capture agents that result in simultaneous gene and protein expression analysis.
In some embodiments, the plurality of templated ligation probes include a pair of probes for a target nucleic acid (e.g., DNA, RNA). The probes are complementary to portions of the target nucleic acid, however, when both probes hybridize to the target nucleic acid a gap is present between the two probes. In some embodiments, the gap is ligated, thereby generating a templated ligation product (e.g., DNA or RNA templated ligation product). In some embodiments, one of the pair of probes includes a flanking sequence complementary to a capture domain of the array. In some embodiments, the sequence complementary to the capture domain of the templated ligation product hybridizes to the capture domain of the capture probe.
In some embodiments, analyte capture agents, as described herein, can also be contacted with the biological sample. In some embodiments, the analyte capture agents are contacted with the biological sample before the biological sample is contacted with an array. In some embodiments, the analyte capture agents are contacted with the biological sample after the biological sample is contacted with the array. In some embodiments, the analyte binding moiety of the analyte capture agent interacts (e.g., binds) to an analyte (e.g., protein) in a biological sample. In some embodiments, the analyte binding moiety is an antibody or antigen-binding fragment.
Analyte capture agents can also include a conjugated oligonucleotide that can comprise one or more domains. For example, the conjugated oligonucleotide can include an analyte binding moiety barcode and an analyte capture sequence. In some embodiments, the analyte binding moiety barcode, or a complement thereof, refers to (e.g., identifies) a barcode that is associated with or otherwise identifies the analyte binding moiety. In some embodiments, the conjugated oligonucleotide can include an analyte capture sequence. In some embodiments, the analyte capture sequence is capable of interacting with (e.g., hybridizing) to a capture domain of a capture probe on a substrate.
In some embodiments, the templated ligation probes are allowed to bind the target nucleic acid before the analyte capture agents are delivered to the biological sample. In some embodiments, the templated ligation probes can be ligated together before, concurrently, or after the analyte capture agents are delivered to the biological sample. In some embodiments, the analyte capture agents are delivered to the biological sample and the analyte binding moiety is allowed to bind the target analyte (e.g., protein) before the templated ligation probes are delivered. In some embodiments, the analyte capture agents are delivered to the biological sample and the analyte capture sequence is blocked (e.g., blocked by any of the methods described herein). In some embodiments, the analyte capture sequence of the analyte capture agents is unblocked (e.g., unblocked by any of the methods described herein) before, concurrently, or after the templated ligation probes (e.g., RNA templated ligation probes) are delivered and/or before, concurrently, or after the templated ligation probes are ligated together.
Thus, provided herein are methods for determining the spatial location of a nucleic acid and a protein from a biological sample including: a) providing a spatial array including a first and second plurality of capture probes where each plurality includes a spatial barcode and a capture domain, b) contacting the spatial array with a biological sample, c) contacting the biological sample with (i) a plurality of analyte capture agents, where an analyte capture agent includes an analyte binding moiety and an oligonucleotide including an analyte binding moiety barcode and an analyte capture sequence, where the analyte capture sequence includes a sequence complementary to a second plurality of capture domains, and (ii) a plurality of templated ligation probes, where one of the templated ligation probes includes a sequence complementary a first plurality of capture domains, d) binding the analyte binding moiety of the analyte capture agent to a target protein, e) hybridizing the templated ligation probes to a target nucleic acid and ligating the probes to produce ligation products, f) hybridizing the ligation products to the first plurality of capture domains and the analyte capture sequences of the bound analyte capture agents to the second plurality of capture domains on the spatial array, and g) determining the sequence or a portion thereof of a captured ligation product, or a complement thereof, and the sequence of the spatial barcode of the capture probe, or a complement thereof, that is associated with the ligation product, and the sequence of the analyte binding moiety barcode, or a complement thereof, of the bound analyte capture agent, thereby determining the spatial location of a nucleic acid and the protein from the biological sample.
Also provided herein are methods for determining the spatial location of a nucleic acid and a protein in a diseased biological sample including: a) providing a spatial array including a first and a second plurality of capture probes where each plurality includes a spatial barcode and a capture domain, b) contacting the diseased biological sample with the spatial array, c) contacting the diseased biological sample with: (i) a plurality of analyte capture agents, where an analyte capture agent includes an analyte binding moiety and an oligonucleotide including an analyte binding moiety barcode and an analyte capture sequence, where the analyte capture sequence includes a sequence complementary to a second plurality of capture domains, and (ii) a plurality of templated ligation probes, where one of the templated ligation probes includes a sequence complementary a first plurality of capture domains, d) binding the analyte binding moiety of the analyte capture agent to a target protein, e) hybridizing the templated ligation probes to a target RNA and ligating the probes to produce templated ligation products, f) hybridizing the templated ligation products to the first plurality of capture domains and the analyte capture sequences of the bound analyte capture agents to the second plurality of capture domains on the spatial array, and g) determining the sequence or a portion thereof of a captured ligation product, or a complement, and the sequence of the spatial barcode of the capture probe, or a complement thereof, that is associated with the ligation product, and the sequence of the analyte binding moiety barcode, or a complement thereof, of the bound analyte capture agent, thereby determining the spatial location of a nucleic acid and the protein in the diseased biological sample.
In some embodiments, the nucleic acid is RNA. In some embodiments, the RNA is mRNA. In some embodiments, the nucleic acid is DNA.
In some embodiments, the diseased biological sample is a cancerous biological sample. In some embodiments, the cancerous biological sample is an ovarian cancer biological sample or a breast cancer biological sample. In some embodiments, the breast cancer sample is triple positive breast cancer. In some embodiments, the breast cancer is invasive ductal cell carcinoma breast cancer. In some embodiments, the invasive ductal cell carcinoma is grade II invasive ductal carcinoma. In some embodiments, the invasive ductal cell carcinoma is grade III invasive ductal carcinoma. In some embodiments, the breast cancer is invasive lobular carcinoma. In some embodiments, the cancerous biological sample is lung cancer. In some embodiments, the cancerous biological sample is melanoma. In some embodiments, the cancerous biological sample is colon cancer. In some embodiments, the cancerous biological sample is glioblastoma. In some embodiments, the cancerous biological sample is prostate cancer.
In some embodiments, the capture probes include unique molecular identifiers, functional sequences, or combinations thereof.
In some embodiments, the first plurality of capture domains are homopolymeric sequences. In some embodiments, the first plurality of capture domains comprise poly(T) sequences. In some embodiments, the first plurality of capture domains are defined non-homopolymeric sequences. In some embodiments, the first plurality of capture domains includes a degenerate sequence. In some embodiments, the first plurality of capture domains includes a fixed sequence. For example, the first plurality of capture domains can comprises one of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, or SEQ ID NO: 11.
In some embodiments, the second plurality of capture domains are homopolymeric sequences. In some embodiments, the second plurality of capture domains are defined non-homopolymeric sequences. In some embodiments, the second plurality of capture domains comprise poly(T) sequences. In some embodiments, the second plurality of capture domains includes a degenerate sequence. In some embodiments, the second plurality of capture domains includes a fixed sequence. For example, the second plurality of capture domains can comprise one of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, or SEQ ID NO: 11.
In some embodiments, the first plurality of capture domains and the second plurality of capture domains include the same sequence. In some embodiments, the first plurality of capture domains and the second plurality of capture domains include different sequences.
Generally, the methods of the present disclosure can be used with any biological sample (e.g., any biological sample described herein). In some embodiments, the biological sample is a tissue section. In some embodiments, the biological sample is a tissue sample. In some embodiments, the biological sample is a fresh-frozen biological sample. In some embodiments, the biological sample is a fixed biological sample (e.g., formalin-fixed paraffin embedded (FFPE), paraformaldehyde, acetone, or methanol). In some embodiments, the biological sample is an FFPE sample. In some embodiments, the biological sample is an FFPE tissue section. In some embodiments, the tissue sample is a tumor sample. In some embodiment, the tissue section is a tumor tissue section. In some embodiments, the tumor tissue section is a fixed tumor tissue section (e.g., a formal-fixed paraffin-embedded tumor tissue section). In some embodiments, the tumor sample comprises one or more cancer tumors. Numerous types of cancer are known in the art. In some embodiments, the tissue sample is derived from a biopsy sample. In some embodiments, the tissue sample is derived from a whole rodent embryo. In some embodiments, the tissue is selected from, but not limited to, brain tissue, breast tissue, colon tissue, heart tissue, lung tissue, spleen tissue, testes tissue, inflamed tonsil tissue, cervix tissue, and lymph node tissue.
In some embodiments, an FFPE sample is deparaffinized and decrosslinked prior to delivering a plurality of templated ligation probes (e.g., RNA templated ligation probes) and analyte capture agents. In some embodiments, an FFPE biological sample is deparaffinized and decrosslinked before step (b). For example, the paraffin-embedding material can be removed (e.g., deparaffinization) from the biological sample (e.g., tissue section) by incubating the biological sample in an appropriate solvent (e.g., xylene), followed by a series of rinses (e.g., ethanol of varying concentrations), and rehydration in water. In some embodiments, the biological sample can be dried following deparaffinization. In some embodiments, after the step of drying the biological sample, the biological sample can be stained (e.g., H&E stain, any of the variety of stains described herein).
In some embodiments, the method includes staining the biological sample. In some embodiments, the staining includes the use of hematoxylin and eosin. In some embodiments, a biological sample can be stained using any number of biological stains, including but not limited to, acridine orange, Bismarck brown, carmine, coomassie blue, cresyl violet, DAPI, eosin, ethidium bromide, acid fuchsine, hematoxylin, Hoechst stains, iodine, methyl green, methylene blue, neutral red, Nile blue, Nile red, osmium tetroxide, propidium iodide, rhodamine, or safranin.
The biological sample can be stained using known staining techniques, including Can-Grunwald, Giemsa, hematoxylin and eosin (H&E), Jenner's, Leishman, Masson's trichrome, Papanicolaou, Romanowsky, silver, Sudan, Wright's, and/or Periodic Acid Schiff (PAS) staining techniques. PAS staining is typically performed after formalin or acetone fixation.
In some embodiments, the staining includes the use of a detectable label selected from the group consisting of a radioisotope, a fluorophore, a chemiluminescent compound, a bioluminescent compound, or a combination thereof.
In some embodiments, the biological sample is imaged after staining the biological sample. In some embodiments, the biological sample is imaged prior to staining the biological sample. In some embodiments, the biological sample is visualized or imaged using bright field microscopy. In some embodiments, the biological sample is visualized or imaged using fluorescence microscopy. Additional methods of visualization and imaging are known in the art. Non-limiting examples of visualization and imaging include expansion microscopy, bright field microscopy, dark field microscopy, phase contrast microscopy, electron microscopy, fluorescence microscopy, reflection microscopy, interference microscopy and confocal microscopy. In some embodiments, the sample is stained and imaged prior to adding the first and/or second primer to the biological sample on the array.
After a fixed (e.g., FFPE, PFA, acetone, methanol) biological sample has undergone deparaffinization, the fixed (e.g., FFPE, PFA) biological sample can be further processed. For example, fixed (e.g., FFPE, PFA) biological samples can be treated to remove crosslinks (e.g., formaldehyde-induced crosslinks (e.g., decrosslinking)). In some embodiments, decrosslinking the crosslinks (e.g., formaldehyde-induced crosslinks) in the fixed (e.g., FFPE, PFA) biological sample can include treating the sample with heat. In some embodiments, decrosslinking the formaldehyde-induced crosslinks can include performing a chemical reaction. In some embodiments, decros slinking the formaldehyde-induced crosslinks, can include treating the sample with a permeabilization reagent. In some embodiments, decrosslinking the formaldehyde-induced crosslinks can include heat, a chemical reaction, and/or permeabilization reagents.
In some embodiments, decrosslinking crosslinks (e.g., formaldehyde-induced crosslinks) can be performed in the presence of a buffer. In some embodiments, the buffer is Tris-EDTA (TE) buffer (e.g., TE buffer for FFPE biological samples). In some embodiments, the buffer is citrate buffer (e.g., citrate buffer for FFPE biological samples). In some embodiments, the buffer is Tris-HCl buffer (e.g., Tris-HCl buffer for PFA fixed biological samples). In some embodiments, the buffer (e.g., TE buffer, Tris-HCl buffer) has a pH of about 5.0 to about 10.0 and a temperature between about 60° C. to about 100° C.
In some embodiments, the biological sample is permeabilized (e.g., permeabilized by any of the methods described herein). In some embodiments, the permeabilization is an enzymatic permeabilization. In some embodiments, the permeabilization is a chemical permeabilization. In some embodiments, the biological sample is permeabilized before delivering the RNA templated ligation probes and analyte capture agents to the biological sample. In some embodiments, the biological sample is permeabilized at the same time as the RNA templated ligation probes and analyte capture agents are delivered to the biological sample. In some embodiments, the biological sample is permeabilized after the RNA templated ligation probes and analyte capture agents are delivered to the biological sample. In some embodiments, hybridizing the RNA templated ligation products to the second capture domains and the analyte capture sequences of the bound analyte capture agents to the first capture domains further comprises permeabilizing the biological sample.
In some embodiments, the biological sample is permeabilized from about 30 to about 120 minutes, from about 40 to about 110 minutes, from about 50 to about 100 minutes, from about 60 to about 90 minutes, or from about 70 to 80 minutes. In some embodiments, the biological samples is permeabilized about 30, about 35, about 40, about 45, about 50, about 55, about 60, about 65, about 70, about 75, about 80, about 90, about 95, about 100, about 105, about 110, about 115, or about 130 minutes.
In some embodiments, the permeabilization buffer comprises urea. In some embodiments, the urea is at a concentration of about 0.5M to 3.0M. In some embodiments, the concentration of the urea is about 0.5, 1.0, 1.5, 2.0, 2.5, or about 3.0M. In some embodiments, the permeabilization buffer includes a detergent. In some embodiments, the detergent is sarkosyl. In some embodiments, the sarkosyl is present at about 2% to about 10% (v/v). In some embodiments, the sarkosyl is present at about 3%, 4%, 5%, 6%, 7%, 8%, or 9% (v/v). In some embodiments, the permeabilization buffer comprises polyethylene glycol (PEG). In some embodiments, the PEG is from about PEG 2K to about PEG 16K. In some embodiments, the PEG is PEG 2K, 3K, 4K, 5K, 6K, 7K, 8K, 9K, 10K, 11K, 12K, 13K, 14K, 15K, or 16K. In some embodiments, the PEG is present at a concentration from about 2% to 25%, from about 4% to about 23%, from about 6% to about 21%, or from about 8% to about 20% (v/v).
In some embodiments, the method includes a step of permeabilizing the biological sample (e.g., a tissue section). For example, the biological sample can be permeabilized to facilitate transfer of the extended products to the capture probes on the array. In some embodiments, the permeabilizing includes the use of an organic solvent (e.g., acetone, ethanol, and methanol), a detergent (e.g., saponin, Triton X100™, Tween-20™, or sodium dodecyl sulfate (SDS)), and an enzyme (an endopeptidase, an exopeptidase, a protease), or combinations thereof. In some embodiments, the permeabilizing includes the use of an endopeptidase, a protease, SDS, polyethylene glycol tert-octylphenyl ether, polysorbate 80, and polysorbate 20, N-lauroylsarcosine sodium salt solution, saponin, Triton X100™, Tween-20™, or combinations thereof. In some embodiments, the endopeptidase is pepsin. In some embodiments, the endopeptidase is Proteinase K. Additional methods for sample permeabilization are described, for example, in Jamur et al., Method Mol. Biol. 588:63-66, 2010, the entire contents of which are incorporated herein by reference.
The methods provided herein can also include antibody staining. In some embodiment, antibody staining includes the use of an antibody staining buffer. In some embodiments, the antibody staining buffer (e.g., a PBS-based buffer) includes a detergent (e.g., Tween-20, SDS, sarkosyl). In some embodiments, the antibody staining buffer includes a serum, such as for example, a goat serum. In some embodiments, the goat serum is from about 1% to about 10% (v/v), from about 2% to about 9% (v/v), from about 3% to about 8% (v/v), or about 4% to about 7% (v/v). In some embodiments, the antibody staining buffer includes dextran sulfate. In some embodiments, the dextran sulfate is at a concentration of about 1 mg/ml to about 20 mg/ml, from about 5 mg/ml to about 15 mg/ml, or from about 8 mg/ml to about 12 mg/ml.
The methods provided herein can also utilize blocking probes to block the non-specific binding (e.g., hybridization) of the analyte capture sequence and the capture domain of a capture probe on an array. In some embodiments, following contact between the biological sample and the array, the biological sample is contacted with a plurality of analyte capture agents, where an analyte capture agent includes an analyte capture sequence that is reversibly blocked with a blocking probe. In some embodiments, the analyte capture sequence is reversibly blocked with more than one blocking probe (e.g., 2, 3, 4, or more blocking probes). In some embodiments, the analyte capture agent is blocked prior to binding the target analyte (e.g., a target protein).
In some embodiments, the oligonucleotide of the analyte capture agent (e.g., analyte capture sequence) is blocked by a blocking probe. In some embodiments, blocking probes are hybridized to the analyte capture sequence of the analyte capture agents before introducing the analyte capture agents to a biological sample. In some embodiments, blocking probes are hybridized to the analyte capture sequence of the analyte capture agents after introducing the analyte capture agents to the biological sample. In such embodiments, the capture domain can also be blocked to prevent non-specific binding, and/or to control the time of binding, between the analyte capture sequence and the capture domain. In some embodiments, the blocking probes can be alternatively or additionally introduced during staining of the biological sample. In some embodiments, the analyte capture sequence is blocked prior to binding to the capture domain, where the blocking probe includes a sequence complementary or substantially complementary to the analyte capture sequence.
In some embodiments, the analyte capture sequence is blocked with one blocking probe. In some embodiments, the analyte capture sequence is blocked with two blocking probes. In some embodiments, the analyte capture sequence is blocked with more than two blocking probes (e.g., 3, 4, 5, or more blocking probes). In some embodiments, a blocking probe is used to block the free 3′ end of the analyte capture sequence. In some embodiments, a blocking probe is used to block the 5′ end of the analyte capture sequence. In some embodiments, two blocking probes are used to block both 5′ and 3′ ends of the analyte capture sequence. In some embodiments, both the analyte capture sequence and the capture probe domain are blocked.
In some embodiments, the blocking probes can differ in length and/or complexity. In some embodiments, the blocking probe can include a nucleotide sequence of about 8 to about 24 nucleotides in length (e.g., about 8 to about 22, about 8 to about 20, about 8 to about 18, about 8 to about 16, about 8 to about 14, about 8 to about 12, about 8 to about 10, about 10 to about 24, about 10 to about 22, about 10 to about 20, about 10 to about 18, about 10 to about 16, about 10 to about 14, about 10 to about 12, about 12 to about 24, about 12 to about 22, about 12 to about 20, about 12 to about 18, about 12 to about 16, about 12 to about 14, about 14 to about 24, about 14 to about 22, about 14 to about 20, about 14 to about 18, about 14 to about 16, about 16 to about 24, about 16 to about 22, about 16 to about 20, about 16 to about 18, about 18 to about 24, about 18 to about 22, about 18 to about 20, about 20 to about 24, about 20 to about 22, or about 22 to about 24 nucleotides in length).
In some embodiments, the blocking probe is removed prior to hybridizing the analyte capture sequence of the oligonucleotide of the analyte capture sequence to the first capture domain. For example, once the blocking probe is released from the analyte capture sequence, the analyte capture sequence can bind to the first capture domain on the array. In some embodiments, blocking the analyte capture sequence reduces non-specific background staining. In some embodiments, blocking the analyte capture sequence allows for control over when to allow the binding of the analyte capture sequence to the capture domain of a capture probe during a spatial workflow, thereby controlling the time of capture of the analyte capture sequence on the array. In some embodiments, the blocking probes are reversibly bound, such that the blocking probes can be removed from the analyte capture sequence during or after the time that analyte capture agents are in contact with the biological sample. In some embodiments, the blocking probe can be removed with RNAse treatment (e.g., RNAse H treatment). In some embodiments, the blocking probes are removed by increasing the temperature (e.g., heating) the biological sample. In some embodiments, the blocking probes are removed enzymatically (e.g., cleaved). In some embodiments, the blocking probes are removed by a USER enzyme. In some embodiments, the blocking probes are removed by an endonuclease. In some embodiments, the endonuclease is endonuclease IV. In some embodiments, the endonuclease is endonuclease V.
In some embodiments, the determining in step (g) includes a) extending the captured ligation products and the captured oligonucleotides of the analyte capture agents, wherein the extension products comprise the spatial barcode or a complement thereof, b) releasing the extension products, or complements thereof, from the spatial array, c) producing a library from the released extension products or complements thereof, and d) sequencing the library. In some embodiments, extension (e.g., extension of captured nucleic acid ligation products and the captured oligonucleotides of the analyte capture agents and/or extension of the plurality of captures probes) is performed with a polymerase (e.g., any suitable polymerase, e.g., T4 polymerase).
In some embodiments, the released extension products can be prepared for downstream applications, such as generation of a sequencing library and next-generation sequencing. Producing sequencing libraries are known in the art. For example, the released extension products can be purified and collected for downstream amplification steps. The released extension products can be amplified using PCR, where primer binding sites flank the spatial barcode and ligation product or analyte binding moiety barcode, or complements thereof, generating a library associated with a particular spatial barcode. In some embodiments, the library preparation can be quantitated and/or quality controlled to verify the success of the library preparation steps. The library amplicons are sequenced and analyzed to decode spatial information and the ligation product or analyte binding moiety barcode, or complements thereof.
Alternatively or additionally, the amplicons can then be enzymatically fragmented and/or size-selected in order to provide for desired amplicon size. In some embodiments, when utilizing an Illumina® library preparation methodology, for example, P5 and P7, sequences can be added to the amplicons thereby allowing for capture of the library preparation on a sequencing flowcell (e.g., on Illumina sequencing instruments). Additionally, i7 and i5 can index sequences be added as sample indexes if multiple libraries are to be pooled and sequenced together. Further, Read 1 and Read 2 sequences can be added to the library preparation for sequencing purposes. The aforementioned sequences can be added to a library preparation sample, for example, via End Repair, A-tailing, Adaptor Ligation, and/or PCR. The cDNA fragments can then be sequenced using, for example, paired-end sequencing using TruSeq Read 1 and TruSeq Read 2 as sequencing primer sites, although other methods are known in the art.
In some embodiments, the determining in step (g) can include a pre-amplification step. For example, a complementary strand to the extended RNA ligation products and/or the extension product of the captured oligonucleotides of the analyte capture agents the step can be generated and further include a pre-amplification step of the extension products or complements thereof (e.g., extended products) prior to library production (e.g., RTL library production; captured oligonucleotide of the analyte capture agent production).
Compositions
Also provided herein are spatial arrays, including spatial arrays described in the methods herein, that include a dilution series of protein standards directly on the array. In general, protein quantification with antibodies can be difficult due to the varying affinity antibodies have for their protein targets. In order to accurately quantify protein abundance with antibodies, standard curves with the protein of interest (e.g., similar to an ELISA assay) can be applied to a spatial array in parallel with spatial proteomic analysis. In some embodiments, a protein standard is spotted on the array (e.g., on top of the features of the array). In some embodiments, more than one protein standard is spotted on the array (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or more protein standards are spotted on the array). Readout from the internal protein standard series allows for quantification of proteins of interest in parallel from the biological sample (e.g., a tissue section) directly on the array which can lead to increased accuracy when determining protein concentration.
Provided herein are compositions such as spatial arrays including a) a plurality of capture probes including spatial barcodes and a first plurality of capture domains hybridized to a plurality of templated ligation products, and b) a plurality of capture probes comprising spatial barcodes and a second plurality of capture domains hybridized to a plurality of oligonucleotides from analyte capture agents, wherein the oligonucleotides comprise an analyte capture sequence and an analyte binding moiety barcode. In some compositions, the analyte capture sequences of the oligonucleotides are hybridized to the second plurality of capture domains.
In some compositions, the capture probes include cleavage domains, unique molecular identifiers, functional sequences, or combinations thereof. In some compositions, the first plurality of capture domains are homopolymeric sequences. In some compositions, the first plurality of capture domains comprise poly(T) sequences. In some compositions, the first plurality of capture domains are defined non-homopolymeric sequences. In some compositions the first plurality of capture domains comprise a degenerate sequence. In some compositions, the first plurality of capture domains comprise a fixed sequence. For example, the first plurality of capture domains can comprise one of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, or SEQ ID NO: 11.
In some compositions, the second plurality of capture domains are homopolymeric sequences. In some compositions, the second plurality of capture domains are defined non-homopolymeric sequences. In some compositions, the second plurality of capture domains comprise poly(T) sequences. In some compositions the second plurality of capture domains comprise a degenerate sequence. In some compositions, the second plurality of capture domains comprise a fixed sequence. For example, the second plurality of capture domains can comprise one of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, or SEQ ID NO: 11.
In some compositions, the spatial array comprises one or more protein dilution series.
Also provided herein are kits including a) a spatial array comprising a plurality of capture probes, where the capture probes include spatial barcodes and wherein the plurality of capture probes comprise a first plurality of first capture domains and a second plurality of second capture domains, b) one or more analyte capture agents, c) one or more RNA templated ligation probe pairs, and d) one or more enzymes and buffers for practicing any of the methods described herein. In some kits, one or more enzymes includes polymerases, RNases, DNases, proteases, lipases, or combinations thereof.
Experiments were undertaken to determine whether analyte capture agents could provide for protein expression analysis concurrently with associated gene expression. In these experiments, the analyte capture agent includes an antibody as the analyte binding moiety and the analyte capture sequence that comprises a barcode sequence that identifies the antibody as well as the capture sequence that is complementary to the associated capture probe capture domain on the array.
Templated ligation probes were allowed to hybridize to their target mRNAs and antibody-oligonucleotide conjugates were incubated with the samples wherein the antibodies were allowed to bind to their protein targets (as described in PCT/US2020/66720). Briefly, FFPE human lymph nodes tissues were sectioned, mounted on spatial array slides and deparaffinized using a series of xylene and ethanol washes prior to brightfield imaging. Tissues were washed and decrosslinked by incubating the tissues in TE (pH 9.0) buffer for 1 hr at 70° C. After decrosslinking the tissues, the targeted templated ligation probes were added to the tissues and probe hybridization ran overnight at 50° C. Post hybridization, the probes were ligated together at 37° C. for 1 hr. Following templated ligation probe hybridization the analyte capture agents were added to the tissues, which were incubated in an antibody staining buffer with the tissues overnight at room temperature. The tissue samples were washed four times with the antibody staining buffer without antibodies.
Tissues were permeabilized and the ligated probe products, or ligation products, were allowed to migrate for hybridization to the capture domains of the capture probes on the spatial array surface. The oligonucleotides of the analyte capture agents also migrated in parallel and were captured via their capture sequences that hybridized to capture probe capture domains on the spatial array that are complementary to the capture sequences. As such, the ligation products representing the target mRNAs and the oligonucleotides of the analyte capture agents representing the binding of the antibodies to the targeted proteins were concurrently captured on the array surface. To allow for probe and oligonucleotide release and capture, the tissues were incubated with RNAse H and an associated buffer for 30 min at 37° C., tissues permeabilized using a protease for an additional 40 min., followed by washing to remove the enzymes from the tissues.
The captured ligation products and the analyte binding agent oligonucleotides were extended to create extended products of the captured molecules including the spatial barcode or a complement thereof, the analyte binding moiety barcode if present and other functional sequences from the capture probe. Library preparations were made, the libraries sequenced on an Illumina sequencing instrument, and spatial locations determined using Space Ranger and Loupe Browser (10X Genomics). The antibody sequences (e.g., the complement of the captured oligonucleotide from the analyte binding agents) were amplified with Truseq_pR1 and Truseq_pR2. For protein localization, sequences relating to the analyte binding moiety barcode were used to determine abundance and location of the labeled protein by the analyte binding agents. Spatial expression patterns were determined using SpaceRanger data analysis software and Loupe browser visualization software (10X Genomics).
Additional experimental results from the multiplexed experiment shown in
Additional data was generated with the target CD8A (e.g., using a CD8A antibody) similar to CD20 described above. The spatial gene expression and protein expression patterns were consistent with the targeting of cytotoxic CD8 positive T cells in the lymph node tissue (data not shown), again demonstrating the utility of the methods and analyte binding agents that target specific proteins of interest for simultaneously determining spatial gene and protein expression of a given target.
As described above experiments were undertaken to determine whether analyte capture agents could provide for protein expression analysis concurrently with associated gene expression in FFPE human tonsil tissue.
Briefly, FFPE human tonsil tissues were sectioned, mounted on spatial array slides and deparaffinized using a series of xylene and ethanol washes prior to H&E staining and brightfield imaging. Tissues were washed and decrosslinked by incubating the tissues in citrate buffer (pH 6.0) for 1 hour at 90° C. After decrosslinking the tissues, the targeted ligation probes were applied to the tissues and probe hybridization ran overnight at 50° C. Post hybridization, the probes were ligated together at 37° C. for 1 hour to generate ligation products. Following ligation probe hybridization the analyte capture agents were applied to the tissues, which were incubated in an antibody staining buffer (PBS-based buffer, 5% goat serum, salmon sperm DNA and dextran sulfate) with the tissues overnight at 4° C. The tissue samples were washed four times with antibody-free antibody staining buffer.
Tissues were permeabilized and the ligation products were allowed to migrate for capture by hybridization to the capture domains of the capture probes on the spatial array surface. The oligonucleotides of the analyte capture agents complementary to the alternative capture sequences of the second set of capture probes on the array were also captured by hybridization. As such, both ligation products representing the mRNA of the targeted protein and the oligonucleotide of the analyte capture agent representing the binding of the antibody to the targeted protein were concurrently captured on the array surface. To allow for probe and oligonucleotide release and capture, the tissues were incubated with RNase H and an associated buffer, and polyethylene glycol (PEG) for 30 minutes at 37° C. Tissues were permeabilized using a permeabilization buffer comprising a protease (e.g., Proteinase K), PEG, 1M urea, for an additional 60 minutes, followed by washing to remove the enzymes from the tissues.
The captured ligation products and the analyte binding agent oligonucleotides were extended to include the spatial barcode or a complement thereof, the analyte binding moiety barcode or a complement thereof if present and other functional sequences from the capture probe. Additionally, said products were pre-amplified prior to library preparation.
Library preparations were made from the extended products, the libraries sequenced on an Illumina sequencing instrument, and spatial locations determined and visualized. The antibody sequences (e.g., the complement of the captured oligonucleotide from the analyte binding agents) were amplified with Truseq_pR1 and Truseq_pR2. For protein localization, sequences relating to the analyte binding moiety barcode were used to determine abundance and location of the labeled protein by the analyte binding agents. Spatial expression patterns were determined using SpaceRanger data analysis software and Loupe browser visualization software (10X Genomics).
In another experiment performed on FFPE tonsil tissue sections exemplary spatial gene and protein expression for a 20-plex antibody-oligonucleotide conjugate targeting proteins of interest and RNA templated probes targeting 18,000 mRNA targets was performed. The FFPE human tonsil tissue section was H&E stained which identified where follicles containing maturing immune cells and the epithelial layer can be seen (data not shown). Representative gene expression cluster data and representative protein expression cluster data align with the macroscopic structures visible in the H&E image shown (data not shown).
The data demonstrate the feasibility of multiplexing different analyte capture agents to concurrently identify the spatial gene and protein expression patterns of multiplex targets in a tissue sample.
Additional exemplary clustering data of spatial gene and protein expression was performed on a different FFPE tonsil tissue sections. Spatial gene expression clustering, spatial protein clustering was performed on the FFPE tonsil tissue sample which was also H&E stained (data not shown). The results demonstrate an experiment where analyte capture agents were combined to determine whether multiple targets could be identified concurrently in FFPE tonsil tissue. In this experiment 21 different antibodies were conjugated to oligonucleotides comprising analyte binding moiety barcodes and capture sequences (e.g., analyte capture sequences) targeting 21 proteins (18 shown in
Collectively, the data demonstrate the utility of the methods and analyte binding agents that target specific proteins of interest for simultaneously determining spatial gene and protein expression of a given target.
Human Triple Positive Breast Cancer Tissue
As described above experiments were undertaken to determine whether analyte capture agents could provide for protein expression analysis concurrently with associated gene expression in FFPE human triple positive breast cancer tissue.
Briefly, FFPE human triple positive breast cancer tissues were sectioned, mounted on spatial array slides and deparaffinized using a series of xylene and ethanol washes prior to drying at room temperature. Next, the slides were heated at 37° C. for 15 minutes, followed by a series of ethanol washes (100%, 96%, 96%, and 70% ethanol). Next, the tissues were H&E stained and brightfield imaged. Alternatively, tissues can be stained (e.g., immunofluorescence stained) instead of H&E staining.
Tissues were washed and decrosslinked by incubating the tissues in Tris-EDTA (TE) buffer (pH 9.0) for 1 hour at 95° C. followed by a series of washes with 0.1 N HCl. After decrosslinking the tissues, the targeted ligation probes were added to the tissues and probe hybridization ran overnight at 50° C. The tissues were washed in a post-hybridization buffer including 3×SSC, Baker's yeast tRNA, and nuclease free water and followed by a 2×SSC buffer wash. Post-hybridization, the probes were ligated together at 37° C. for 1 hour. Following probe hybridization, the tissues were incubated in an antibody blocking buffer (PBS-based buffer (pH 7.4), goat serum, salmon sperm DNA, Tween-20, an RNase inhibitor, and dextran sulfate) at room temperature for 60 minutes. The blocking buffer was removed from the tissues and the tissues were incubated overnight at 4° C. with the analyte capture agents in an antibody staining mixture (PBS-based buffer (pH 7.4), 5% goat serum, 0.1 μg/μL salmon sperm DNA, 0.1% Tween-20, 1 U/μL RNase inhibitor, blocking oligonucleotides, analyte capture agents (e.g., antibodies with a conjugated oligonucleotide) and 10 mg/mL dextran sulfate)). The tissue samples were washed several times with antibody staining buffer without antibodies.
Tissues were permeabilized and the ligated probes were released for capture by hybridization to the capture domains of the capture probes on the spatial array surface. The oligonucleotides of the analyte capture agents complementary to the alternative capture sequences of the second set of capture probes on the array were also captured by hybridization. As such, both ligation products representing the target mRNA and the oligonucleotide of the analyte capture agent representing the binding of the antibody to the targeted protein were concurrently captured on the array surface. To allow for probe and oligonucleotide release and capture, the tissues were incubated with an RNase (e.g., RNase H), an associated buffer, and polyethylene glycol (PEG) for 30 minutes at 37° C. Tissues were permeabilized using a permeabilization buffer comprising a protease (e.g., Proteinase K), PEG, 3M urea, for an additional 60 minutes, followed by washing to remove the enzymes from the tissues. After permeabilization the tissues were washed in 2×SSC several times.
The captured ligation products and the analyte binding agent oligonucleotides were extended to create extended products of the captured molecules including the complement of the spatial barcode, the analyte binding moiety barcode if present and other functional sequences from the capture probe. Additionally, said products were pre-amplified prior to library preparation.
Library preparations were made from the extended products, sequenced on an Illumina sequencing instrument, and spatial locations were determined and visualized. The antibody sequences (e.g., the complement of the captured oligonucleotide from the analyte binding agents) were amplified with Truseq_pR1 and Truseq_pR2. For protein localization, sequences relating to the analyte binding moiety barcode were used to determine abundance and location of the labeled protein by the analyte binding agents. Spatial expression patterns were determined using SpaceRanger data analysis software and Loupe browser visualization software (10X Genomics).
A panel of 11 targeted proteins including specifically genes: Her2, EpCAM, PanCK, N-Cadherin, PCNA, AlphaSMA, Vimentin, CD8a, CD4, CD68, CD20, and HLA-DR was generated where for each target RNA expression and protein expression was generated (data not shown). Exemplary spatial gene and protein expression for KRT10, KRT18, and PanCK Ab was also generated and unbiased clustering of gene and protein expression superimposed on the H&E image demonstrate similar patterns (data not shown). An expanded view of Her2 and Vimentin RNA expression and protein expression is shown in
As described above experiments were undertaken to determine whether analyte capture agents could provide for protein expression analysis concurrently with associated gene expression in FFPE invasive ductal carcinoma breast cancer tissue.
The samples were prepared as described above in the FFPE triple positive breast cancer example.
Collectively, the data demonstrate the feasibility of multiplexing different analyte capture agents to concurrently identify the spatial gene and protein expression in triple positive FFPE invasive ductal carcinoma tissue samples.
Experiments were undertaken to determine whether analyte capture agents could provide for protein expression analysis concurrently with associated gene expression in FFPE mouse tissues, including whole mouse embryos or portions thereof. The following experiments tested spatial gene and protein expression in sandwiching and non-sandwiching formats. In some examples, the alignment of a first substrate with a biological sample and a second substrate with a spatial array thereon is facilitated by a sandwiching process. Accordingly, described herein are methods of sandwiching together the first substrate with a biological sample with a second substrate comprising an array with a plurality of capture probes, where the capture probe includes a spatial barcode and a capture domain.
In a non-limiting example, FFPE mouse spleen samples, FFPE mouse samples, FFPE mouse embryo torso samples, FFPE mouse embryo head samples were placed onto standard slides (for sandwich conditions) or spatial expression (GEx) slides (as non-sandwich conditions). GEx slides include an array of spatially barcoded capture probes. Briefly, tissues were sectioned and mounted on slides and dried overnight in a desiccator. The following day, the tissues were heated to 60° C., followed by deparaffinization and rehydration. Tissues were H&E stained and bright-field imaged. Tissues were destained using HCl and decrosslinked for 1 hour in citrate buffer (pH 6.0) at 95° C. After decrosslinking, tissues were incubated overnight with whole mouse transcriptome (RNA templated ligation) probe sets at 50° C. The following day, tissues were washed to remove un-hybridized probes, then treated with ligase to ligate together the RTL probes. After another wash step, the tissues were blocked with antibody blocking buffer. Tissues were incubated overnight with a library of conjugated antibodies (e.g., a library comprising a plurality of analyte capture agents, each comprising an antigen specific antibody conjugated to an oligonucleotide). The following day, tissues were subjected to sandwiching or non-sandwich conditions as follows.
Tissues placed on standard slides for the sandwiching conditions were washed with PBS-T, subjected to an eosin stain, and washed with SSC. The tissues were subjected to sandwiching conditions. Briefly, the tissue slides were mounted in a sandwiching instrument along with a GEx slide and a reagent solution including an RNAse and Proteinase K. Upon closure in the instrument, the tissue sections were permeabilized for 30 min. allowing the ligation products and the oligonucleotides from the analyte capture agents to migrate to the GEx slide for capture by the capture probes. Following permeabilization and capture, the GEx slides were removed from the instrument.
Tissues placed on GEx slides for non-sandwiching conditions were washed with PBS-T and SSC. The tissues were subjected to a 30 min probe release step with an RNase, followed by permeabilization with a permeabilization buffer including Proteinase K. Accordingly, the ligation products and analyte capture agents were captured by the capture probes on the GEx slide.
Regardless of conditions, GEx slides were washed twice with 2×SSC, and subjected to probe extension, denaturation, and pre-amplification followed by amplification and sequencing of the templated ligation and analyte capture agent libraries.
After sequencing, the quality, sensitivity, and detection under each condition (sandwiching and non-sandwiching conditions) was evaluated. As shown in Table 1, the quality, sensitivity, and detection of globally-detected transcripts (i.e., mRNA) and proteins were comparable across the sandwich and non-sandwich conditions.
Images were generated to evaluate the overlap of gene expression and gene protein profiles in mouse spleen tissue and mouse brain tissue for individual biomarkers. As shown in
The quality, sensitivity, and detection under each condition (sandwiching and non-sandwiching conditions) were evaluated globally in mouse brain samples. As shown in Table 2, the quality, sensitivity, and detection of globally-detected transcripts (i.e., mRNA) and proteins were comparable across the sandwich and non-sandwich conditions in mouse brain samples.
Similar to the mouse spleen sample images described above, individual gene expression and protein products were evaluated in mouse brain samples. As shown in
Experiments using the same methods (i.e., testing sandwiching conditions versus non-sandwiching conditions while detecting both RNA and protein) were performed on whole mouse embryo torso and head sections. In addition to conditions in which both RNA and protein were detected, a third condition was included as a control. This third condition (Condition 3 in Tables 3 and 4) detected the presence and abundance of only RNA. In each condition, RNA was detected using templated ligation as previously described. For Conditions 1 and 2 as shown in Tables 3 and 4 below, protein was also detected using analyte capture agent methods as previously described. The quality, sensitivity, and detection under each condition (sandwiching versus non-sandwiching conditions) were evaluated in mouse embryo torso and head samples. As shown in Tables 3 and 4, the quality, sensitivity, and detection of globally-detected transcripts (i.e., mRNA) and proteins were comparable across the sandwich and non-sandwich conditions in mouse embryo torso and head/upper torso samples. Further, the quality, sensitivity, and detection of globally-detected transcripts (i.e., mRNA) was roughly the same between Conditions 1 and 3, demonstrating that both protein capture and sandwiching methods did not interfere with RNA capture using templated ligation methods.
In addition to performing global expression analysis on each group, individual targets were analyzed for the location and abundance of spatial gene expression (e.g., mRNA) and spatial protein expression of single targets in the mouse embryo torso and head/upper torso samples.
Additional single biomarkers were analyzed in the mouse embryo torso and head samples. As shown in
Four additional biomarkers—troponin C1, slow skeletal and cardiac type (Tnnc1; e.g., Ensemb1: ENSMUSG00000091898); fibroblast growth factor 15 (Fgf15; e.g., Ensemb1: ENSMUSG00000031073); epiphycan (Epyc e.g., Ensemb1: ENSMUSG00000019936); and serine (or cysteine) peptidase inhibitor, Glade A, member 1 E (Serpinale; e.g., Ensemb1: ENSMUSG00000072849) were examined in head/upper torso and torso mouse embryo samples under Conditions 1, 2, and 3 from Tables 3 and 4. See
As such, using sandwiching or non-sandwiching conditions, both gene and protein expression, down to the single biomarker level, can be detected concurrently across multiple tissue types using the methods described herein.
Experiments were undertaken to determine whether analyte capture agents could provide for spatial protein and gene expression analysis in FFPE cancer tissue sections. Additionally, experiments were undertaken to identify various types of immune cells in breast cancer FFPE tissue sections and ovarian cancer FFPE tissue sections. The tissue sections were prepared and analysis was performed by the methods described in Example 4.
Invasive Ductal Carcinoma Breast Cancer
As shown in
The spatial gene and spatial protein expression clustering superimposed on the H&E stained image shown in
Additionally, spatial gene and protein expression of additional genes and proteins were examined from the same tissue section shown in
In a different grade II invasive ductal carcinoma FFPE breast cancer tissue section the tissue section was H&E stained and spatial protein expression of PanCK and HLA-DR within the tissue section. Manual selection of the HLA-DR and PanCK positive regions was performed with the 10x Loupe Browser showing contrasting regions within the tissue section. Local differential expression analysis of both regions generated the top 50 genes associated with expression in the HLA-DR or PanCK selected regions identified and are shown in Table 5.
The data demonstrate that spatial protein expression can identify immune cell infiltration in breast cancer FFPE tissue sections and moreover the spatial protein expression correlates with annotations by a pathologist which demonstrates the utility of the methods described herein in identifying immune cells within a tumor microenvironment can be used as a diagnostic tool.
Ovarian Carcinoma
As shown in
The 25-plex antibody panel included antibodies for protein immune markers which confirmed the presence of immune cells within the ovarian cancer FFPE tissue section. Further, the antibody panel distinguished (e.g., subtyped) the immune cells based on their characteristic surface markers. For example,
shows spatial gene expression in the large carcinoma of interphotoreceptor matrix proteoglycan 2 (IMPG2), which is known to be involved in tumor growth, which also correlates with protein expression data. The data demonstrate that spatial protein expression can identify immune cell infiltration in ovarian cancer FFPE tissues sections and moreover the spatial protein expression correlates with annotations by a pathologist and with gene expression data which demonstrates the utility of the methods described herein in identifying immune cells within a tumor microenvironment. The methods described herein can also be used as a diagnostic tool and/or screening method. Additionally, spatial gene expression correlating to different ovarian carcinomas within a tissue section are distinguishable by the methods described herein.
Experiments were undertaken to determine whether analyte capture agents could provide for spatial protein and gene expression analysis in FFPE cancer tissue sections. The tissue sections were prepared and analysis was performed by the methods described in Example 4.
Lung Cancer
As shown in
The data demonstrate that spatial gene and spatial protein expression correlate with each other which demonstrates the utility of the methods described herein in identifying spatial gene and protein expression in lung cancer FFPE tissue sections which can be used as a diagnostic tool.
Melanoma
As shown in
The data demonstrate that spatial gene and spatial protein expression correlate with each other which demonstrates the utility of the methods described herein in identifying spatial gene and protein expression in melanoma FFPE tissue sections which can be used as a diagnostic tool.
Other Tissues Assayed
In addition to the various FFPE tissue sections assayed as described herein, other tissue types were assayed including: healthy brain tissue, breast cancer invasive lobular carcinoma tissue, healthy breast tissue, colon cancer tissue, healthy colon tissue, glioblastoma tissue, heart tissue, healthy lung tissue, prostate cancer tissue, healthy spleen tissue, testes tissue, inflamed tonsil tissue, cervix tissue, and lymph node tissue (data not shown).
It is to be understood that while the invention has been described in conjunction with the detailed description thereof, the foregoing description is intended to illustrate and not limit the scope of the invention, which is defined by the scope of the appended claims. Other aspects, advantages, and modifications are within the scope of the following claims.
This application is a continuation of U.S. patent application Ser. No. 17/867,223, filed Jul. 18, 2022, which is a continuation of International Application PCT/US2022/020985, with an international filing date of Mar. 18, 2022, which claims priority to U.S. Provisional Patent Application No. 63/162,870, filed on Mar. 18, 2021, U.S. Provisional Patent Application No. 63/214,058, filed on Jun. 23, 2021, U.S. Provisional Patent Application No. 63/245,697, filed on Sep. 17, 2021, U.S. Provisional Patent Application No. 63/252,335, filed on Oct. 5, 2021, U.S. Provisional Patent Application No. 63/270,230, filed on Oct. 21, 2021, and U.S. Provisional Patent Application No. 63/311,703, filed on Feb. 18, 2022. The contents of each of these applications is incorporated herein by reference in their entireties.
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| Parent | 17867223 | Jul 2022 | US |
| Child | 18348063 | US | |
| Parent | PCT/US2022/020985 | Mar 2022 | US |
| Child | 17867223 | US |
