Patent Application
20110300178
The present invention relates to the field of detection and identification of Human Papillomavirus (HPV) infections, and relates to novel polynucleotide sequences, as well as the identification of HPV types associated with cervical cancer.
Cervical cancer is the second most common malignancy in women, following breast cancer. Carcinoma of the cervix is unique in that it is the first major solid tumor in which HPV DNA is found in virtually all cases and in precursor lesions worldwide.
Over 100 HPV types have been characterized and are numbered in chronological order of isolation. HPV is epitheliotropic and infects only the skin (cutaneous types) or the mucosa of the respiratory and anogenital tract (mucosal types). More than 40 HPV types are known to infect the uterine cervix. Based on the induced benign, premalignant or malignant lesions, HPV is divided into low-risk (e.g., HPV types 6, 11, 42, 43 and 44) and high-risk types (e.g., types 16, 18, 31, 33 and 45), respectively. The high-risk types account for more than 99% of all invasive cervical cancers. Consequently, detection and identification of HPV types is very important. The high-risk types are by definition consistently found in high grade SIL (Squamous Intraepithelial Lesion) and carcinoma in-situ whereas low risk types are mainly found in low grade SIL. This epidemiological observation is supported by molecular findings. For instance, the E6 and E7 proteins from low-risk types 6 and 11 bind p53 and pRB too weakly to immortalize keratinocytes in vitro or to induce malignant transformation in vivo. The circular ds-DNA genome of low-risk HPV types remains episomal whereas the genome of high-risk HPV types is able to integrate into the human genome.
Screening for malignant and premalignant disorders of the cervix is usually performed according to the Papanicoloau (PAP) system. The cervical smears are examined by light microscopy and the specimens containing morphologically abnormal cells are classified into PAP I to V, at a scale of increasing severity of the lesion. This cytomorphological method is an indirect method and measures the possible outcome of an HPV infection. Therefore, HPV DNA detection and typing is of importance in secondary screening in order to select patients for monitoring (follow-up) and treatment. This means that cervical smears classified as PAP II (atypical squamous metaplasia) or higher classes should be analyzed for low-risk and high risk HPV types. Follow-up studies have shown that only high-risk HPV types are involved in the progression from cytologically normal cervix cells to high grade SIL. These results indicate that the presence of high-risk HPV types is a prognostic marker for development and detection of cervical cancer.
Diagnosis of HPV by culture is not possible. Also diagnosis by detection of HPV antibodies appears to be hampered by insufficient sensitivity and specificity. Direct methods to diagnose an HPV infection are mainly based on detection of the viral DNA genome by different formats of DNA/DNA or RNA/DNA hybridization with or without prior amplification of HPV DNA. The polymerase chain reaction (PCR) is a method that is highly efficient for amplification of minute amounts of target DNA. Nowadays, mainly three different primer pairs are used for universal amplification of HPV DNA (“broad spectrum primers”). Three of these primer pairs, MY11/MY09, GP5/GP6 and the SPF10 system, are directed to conserved regions among different HPV types in the L1 region (Manos et al., Cancer Cells 1989, 7:209-214; Van den Brule et al., J Clin Microbiol. 1990 28(12):2739-43, WO9914377). The PGMY system, a modification of the MY09/11 is also used (see Gravitt, P., 2000. J. Clin. Microbiol. 38:357-361). Another primer pair, CPI/CPII, is directed to conserved regions in the E1 region but is not often used. WO2006077102 discloses a further set of suitable primers.
There are several methods to identify the various HPV types.
HPV DNA can be typed by PCR primers that recognize only one specific type. This method is known as type-specific PCR. Such methods have been described for HPV types 6, 11, 16, 18, 31 and 33 The primers are aimed at the E5, L1, E6, L1, E2 and E1 regions of the HPV genome for types 6, 11, 16, 18, 31 and 33, respectively.
Another method is general amplification of a genomic part from all HPV types followed by hybridization with two cocktails of type-specific probes differentiating between the oncogenic and non-oncogenic groups, respectively. A similar typing method has been described without prior amplification of HPV DNA. In the hybrid capture assay (digene HPV hc2 Test; Qiagen), each sample is tested for a group of “high-risk” HPV types (i.e., 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59 and 68) and for another group of “low-risk” HPV types (i.e., 6, 11, 42, 43 and 44) (Cox et al., Am J Obstet. Gynecol. 1995 March; 172(3):946-54.).
A detection and typing system disclosed in WO9914377 utilises a PCR amplification step and a reverse line blot hybridization with type specific probes.
At present, formal classification of human papillomaviruses is based on sequence analysis of a 291 bp fragment from the L1 region (Chan et al. J. Virol. 1995 May; 69(5):3074-83, De Villiers et al., Virology. 2004 Jun. 20; 324(1): 17-27) Phylogenetic analysis of these sequences allows classification of the different HPV types. By definition, if the sequence difference across this region between two HPV isolates is higher than 10% they are classified as different types. Consequently, if the sequence differs more than 10% from any known HPV type it is classified as a novel HPV type. HPV isolates that differ between 2-10% are classified as different subtypes. Finally, if the sequence variation is below 2%, the 2 isolates are classified within the same subtype as different variants.
HPV sequences of HPV types (16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, 68, 73 and 82 [Bosch et al., Dis Markers. 2007; 23(4):213-27] have already been reported to be present as a single infection in cervical carcinomas and are therefore classified as oncogenic types. However the carcinogenic potential of certain HPV types is still not confirmed.
In one aspect the invention relates to a probe capable of specific hybridization with an HPV viral polynucleotide target possibly present in a biological sample, the HPV viral polynucleotide target comprising a polynucleotide sequence of any of SEQ ID NO 1-SEQ ID NO 30, or fragment thereof, that comprises a discriminatory nucleotide, as indicated in Table 1,
the probe being capable of specific hybridisation to the target over at least the discriminatory nucleotide position, to allow the target sequence to be distinguished from other HPV viruses types.
In one aspect the invention relates to a method of typing any HPV nucleic acid possibly present in a biological sample comprising the steps of contacting any such nucleic acid with at least one probe of the invention under stringent conditions, and analysing HPV type based upon the hybridisation result so obtained.
In one aspect the invention relates to a kit comprising a probe of the present invention in combination with one or more of the following:
In one aspect of the invention there is provided an isolated HPV polynucleotide sequence distinguishable from other HPV types, or subtypes or variants by the presence of one or more discriminatory nucleotides listed in table 1, or a complementary polynucleotide sequence thereto.
The invention also relates to an isolated HPV polynucleotide sequence comprising a discriminatory nucleotide as indicated in table 1, wherein the polynucleotide encodes all or a fragment of the HPV L1 protein, or a fragment thereof.
The invention also relates to an isolated HPV polynucleotide sequence of the invention which comprises the complete genomic DNA of an HPV virus.
In one aspect the invention relates to an isolated polynucleotide sequence comprising the complete sequence of any of the sequences of SEQ ID NO 1-SEQ ID NO 30, or a complementary polynucleotide sequence thereto.
In one aspect the invention relates to an HPV virus comprising a polynucleotide sequence of the sequences of any of SEQ ID NO1-SEQ ID NO 30.
In one aspect the invention relates to an HPV Virus-Like-Particle (VLP) comprising the HPV L1 protein or fragment thereof expressed from an L1 sequence comprising any of SEQ ID NO1-SEQ ID NO 30.
In one aspect the invention relates to a process for identification of HPV viral types associated with cervical cancer, the process comprising:
In one aspect the invention relates to a kit for determining the presence of HPV high risk types associated with the development of cervical cancer, the kit comprising a means to specifically detect one or more of HPV types 20, 61, 30, 67 69 and 91, or to the variants of HPV 64, 34, or 54 listed in table 1, in the screening of tissue samples for the identification of high risk HPV types.
In one aspect the invention relates to use of a probe specific for one or more of HPV types 20, 61, 30, 67, 69 and 91, or specific for the variants of HPV 64, 34, or 54 listed in table 1, in the screening of tissue samples for the identification of high risk HPV types.
In one aspect the invention relates to use of one or more of HPV types 20, 61, 30, 67, 69 and 91 or the variants of HPV 64, 34, or 54 listed in table 1 in the preparation of a vaccine for prevention or treatment of HPV infection or disease.
In one aspect the invention relates to a vaccine for the prevention of cervical cancer comprising an HPV antigen selected from HPV types 20, 61, 30, 67, 69, 91, or the variants of HPV 64, 34, or 54 listed in table 1, or nucleic acid encoding said antigen.
In one aspect the invention relates to a vaccine for the prevention of cervical cancer comprising an HPV Virus-Like-Particle (VLP) comprising the HPV L1 protein, or fragment thereof, expressed from an L1 sequence comprising any of SEQ ID NO1-SEQ ID NO 30.
Table 1 defines SEQ ID 1-SEQ ID 30.
Table 2 lists the HPV types and variants identified as being associated with cervical cancer.
In one aspect the invention relates to polynucleotide, such as DNA or RNA, which can serve as probes in the identification of different HPV types, subtypes or variants, or polynucleotide which serve as targets for such probes (for example, as controls in experiments), and to vaccines or viruses comprising said polynucleotide sequences.
In one aspect of the invention there is provided an isolated HPV polynucleotide sequence distinguishable from other HPV types, or subtypes or variants by the presence of one or more discriminatory nucleotides listed in table 1, or a complementary polynucleotide sequence thereto.
The invention also relates to an isolated HPV polynucleotide sequence comprising a discriminatory nucleotide as indicated in table 1, wherein the polynucleotide encodes all or a fragment of the HPV L1 protein, or a fragment thereof.
In one aspect an HPV polynucleotide is a sequence capable of use in discrimination between different HPV types, subtypes and/or variants.
In one aspect the invention relates to an isolated polynucleotide sequence comprising the complete sequence of any of the sequences of SEQ ID NO 1-SEQ ID NO 30, or a complementary polynucleotide sequence thereto.
In various aspects the invention relates to:
SEQ ID NO 1 An isolated HPV polynucleotide sequence which comprises a T at position 6621 when compared to HPV 16 reference sequence K02718.
SEQ ID NO 2 An isolated HPV polynucleotide sequence which comprises a C at position 6620 when compared to HPV 16 reference sequence K02718.
SEQ ID NO 3 An isolated HPV polynucleotide sequence which comprises a G at position 6620 when compared to HPV 16 reference sequence K02718.
SEQ ID NO 4 An isolated HPV polynucleotide sequence which comprises a G at position 6620 when compared to HPV 16 reference sequence K02718.
SEQ ID NO 5 An isolated HPV polynucleotide sequence which comprises a T at position 6555 when compared to HPV 18 reference sequence EF202155.
SEQ ID NO 6 An isolated HPV polynucleotide sequence which comprises a G at position 6624 and an A at position 6638 when compared to HPV 39 reference sequence M62849.
SEQ ID NO 7 An isolated HPV polynucleotide sequence which comprises a G at position 6624 when compared to HPV 39 reference sequence M62849.
SEQ ID NO 8 An isolated HPV polynucleotide sequence which comprises a G at position 2598 when compared to HPV 68 reference sequence M73258.
SEQ ID NO 9 An isolated HPV polynucleotide sequence which comprises a G at position 6578 when compared to HPV 56 reference sequence X74483.
SEQ ID NO 10 An isolated HPV polynucleotide sequence which comprises a G at position 6578 when compared to HPV 56 reference sequence X74483.
SEQ ID NO 11 An isolated HPV polynucleotide sequence which comprises a G at position 6578 and a G at position 6595 when compared to HPV 56 reference sequence X74483.
SEQ ID NO 12 An isolated HPV polynucleotide sequence which comprises a G at position 6578 when compared to HPV 56 reference sequence X74483.
SEQ ID NO 13 An isolated HPV polynucleotide sequence which comprises a C at position 6603 when compared to HPV 67 reference sequence D21208.
SEQ ID NO 14 An isolated HPV polynucleotide sequence which comprises a C at position 6603 and a G at position 6697 when compared to HPV 67 reference sequence D21208.
SEQ ID NO 15 An isolated HPV polynucleotide sequence which comprises a G at position 6569 and a C at position 6603 when compared to HPV 67 reference sequence D21208.
SEQ ID NO 16 An isolated HPV polynucleotide sequence which comprises an A at position 6622 when compared to HPV 30 reference sequence X74474.
SEQ ID NO 17 An isolated HPV polynucleotide sequence which comprises a C at position 6559 when compared to HPV 26 reference sequence X74472.
SEQ ID NO 18 An isolated HPV polynucleotide sequence which comprises an A at position 26 and a Tat position 40 when compared to HPV 64 reference sequence U12495.
SEQ ID NO 19 An isolated HPV polynucleotide sequence which comprises an A at position 6539, an A at position 6548, and an A at position 6550 when compared to HPV 54 reference sequence AF436129.
SEQ ID NO 20 An isolated HPV polynucleotide sequence which comprises 33 nucleotides before position 1 when compared to unclassified HPV reference sequence AJ012757.
SEQ ID NO 21 An isolated HPV polynucleotide sequence which comprises a C at position 6689 when compared to HPV 30 reference sequence X74474.
SEQ ID NO 22 An isolated HPV polynucleotide sequence which comprises a G at position 6714 when compared to HPV 30 reference sequence X74474.
SEQ ID NO 23 An isolated HPV polynucleotide sequence which comprises a T at position 6617 when compared to HPV 16 reference sequence K02718.
SEQ ID NO 24 An isolated HPV polynucleotide sequence which comprises an A at position 6469 when compared to HPV 34 reference sequence X74476.
SEQ ID NO 25 An isolated HPV polynucleotide sequence which comprises a T at position 6580 when compared to HPV 54 reference sequence U37488.
SEQ ID NO 26 An isolated HPV polynucleotide sequence which comprises a C at position 21 when compared to HPV 64 reference sequence U12495.
SEQ ID NO 27 An isolated HPV polynucleotide sequence which comprises a G at position 2598 when compared to HPV 68 reference sequence M73258.
SEQ ID NO 28 An isolated HPV polynucleotide sequence which comprises an A at position 6635 when compared to HPV 30 reference sequence X74474.
SEQ ID NO 29 An isolated HPV polynucleotide sequence which comprises a G at position 6583, a T at position 6590, a Tat position 6607 and an A at position 6619 when compared to HPV 82 reference sequence AB027021.
SEQ ID NO 30 An isolated HPV polynucleotide sequence which comprises an A at position 6818 & T at position 6833 when compared to HPV 91 reference sequence AF419318.
In one aspect the invention relates to a probe capable of specific hybridzaton with an HPV viral polynucleotide target possibly present in a sample, the HPV viral polynucleotide target comprising a polynucleotide sequence of any of SEQ ID NO 1-SEQ ID NO 30, the probe being capable of specific hybridisation across all or a part of the respective sequence of any of SEQ ID NO 1-SEQ ID NO 30 to allow the target sequence to be distinguished from other HPV viruses types, subtypes or variants.
The “sample” may be any material which may contain HPV nucleic acid, such as biological material, for example taken either directly from a human being (or animal), or after culturing (enrichment), or may be recombinant HPV nucleic acid expressed in a host cell. Biological material may be e.g. urine, or scrapes/biopsies from the urogenital tract or any part of the human or animal body.
Reference to SEQ ID NO 1-SEQ ID NO 30 is taken herein to refer to any of the 30 sequences (SEQ ID NO 1, SEQ ID NO 2 . . . SEQ ID NO 30) disclosed herein in table 1 and
Probes of the present invention are capable of specific hybridisation across all or a part of the sequence of any of SEQ ID NO 1-SEQ ID NO 30, to allow a target sequence comprising all or a part of the sequence of SEQ ID NO 1-SEQ ID NO 30 to be distinguished from other HPV virus types, subtypes or variants. Reference to HPV ‘types’ hereinafter is taken to include subtypes or variants, unless otherwise apparent from the context, and reference herein to HPV types can be replaced by reference to HPV types, subtypes and variants.
In one aspect the invention relates to a probe capable of distinguishing between HPV viruses at one or more of the specific points of difference between the determined sequences of any of SEQ ID NO 1-SEQ ID NO 30 and the respective reference sequences noted in the Figures herein.
The term “probe” according to the present invention generally refers to a single-stranded oligonucleotide which is designed to specifically hybridize to HPV polynucleic acids.
The term “target” or “target sequence” of a probe according to the present invention is a sequence within an HPV polynucleic acid to which the probe or the primer is completely complementary or partially complementary (where partially complementary allows for some degree of mismatch). It is to be understood that the complement of said target sequence is also a suitable target sequence in some cases. Probes of the present invention are suitably complementary to at least the central part of their target sequence. In most cases the probes are completely complementary to their target sequence.
“Specific hybridization” of a probe to a region of an HPV polynucleic acid target means that said probe forms a duplex with part of this region or with the entire region under the experimental conditions used, and that under those conditions said probe does not form a duplex with other regions of the polynucleic acids present in the sample to be analysed. It should be understood that probes that are designed for specific hybridisation within a region of HPV polynucleic acid may fall entirely within said region or may to a large extent overlap with said region (i.e. form a duplex with nucleotides outside as well as within said region).
Suitably the specific hybridisation of a probe to a nucleic acid target region occurs under stringent hybridisation conditions, such as 3×SSC, 0.1% SDS, at 50° C. The skilled person knows how to vary the parameters of temperature, probe length and salt concentration such that specific hybridisation can be achieved. Hybridization and wash conditions are well known and exemplified in Sambrook, et al., Molecular Cloning: A Laboratory Manual, Second Edition, Cold Spring Harbor, N.Y., (1989), particularly Chapter 11 therein. When needed, slight modifications of the probes in length or in sequence can be carried out to maintain the specificity and sensitivity required under the given circumstances.
Preferred stringent conditions are suitably those which allow for a type specific probe binding to only one HPV type. Probes which specifically hybridise to the target suitably are at least 95% complementary to the target sequence over their length, suitably greater than 95% identical such as 96%, 97%, 98%, 99% and most preferably 100% complementary over their length to the target HPV sequence. Suitably each nucleotide of the probe can form a hydrogen bond with its counterpart target nucleotide.
Preferably the complementarity of probe with target is assessed by the degree of A:T and C:G base pairing, such that an adenine nucleotide pairs with a thymine, and such that a guanine nucleotide pairs with a cytosine, or vice versa. In the RNA form, T may be replaced by U (uracil).
Preferably, the probes of the invention are about 5 to 50 nucleotides long, more preferably from about 10 to 25 nucleotides. Particularly preferred lengths of probes include 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 or 25 nucleotides. The nucleotides as used in the present invention may be ribonucleotides, deoxyribonucleotides and modified nucleotides such as inosine or nucleotides containing modified groups which do not essentially alter their hybridization characteristics. Probes may include locked nucleic acid (LNA) nucleotides, which can be mixed with DNA or RNA bases in the oligonucleotide whenever desired (see Kaur, H.; Arora, A.; Wengel, J.; Maiti, S. (2006). “Thermodynamic, Counterion, and Hydration Effects for the Incorporation of Locked Nucleic Acid Nucleotides into DNA Duplexes”. Biochemistry 45 (23): 7347-55.
The oligonucleotides used as probes may also comprise nucleotide analogues such as phosphorothiates, alkylphosphorothiates or peptide nucleic acids or may contain intercalating agents. As most other variations or modifications introduced into the original DNA sequences of the invention these variations will necessitate adaptions with respect to the conditions under which the oligonucleotide should be used to obtain the required specificity and sensitivity. However the eventual results of hybridization will be essentially the same as those obtained with the unmodified oligonucleotides. The introduction of these modifications may be advantageous in order to positively influence characteristics such as hybridization kinetics, reversibility of the hybrid-formation, biological stability of the oligonucleotide molecules, etc.
Probes of the present invention may be labelled in any suitable manner to allow detection of binding to a target. For example the probe may be labelled with a radioactive, luminescent or fluorescent label, or with a label that is capable of reacting with another component to produce a detectable signal which may be, for example, a radioactive, luminescent or fluorescent signal. The nature of the label may be isotopic (32P, 35S, etc.) or non-isotopic (biotin, digoxigenin, etc.) Where nucleic acids are labelled the labelling may be carried out by the use of labelled nucleotides incorporated during any polymerase step of the amplification.
In one aspect the probe of the present invention may be used in combination with other probes to form sets of probes, for example a set for detection of high risk HPV types. The sets of probes of the present invention may include at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50 or more probes.
For the avoidance of doubt the probes of the invention are claimed individually and in groups of (where appropriate) at least 5, 10, 15, 20, 25, 30, 35, 40 probes.
The probe may be immobilised on a solid support. By way of example, a probe may be immobilised on a solid support as described in WO9914377, and optionally used in a line probe assay. The probe may optionally be immobilised in combination with other probes which are specific for HPV types, subtypes or variants.
The term “solid support” can refer to any substrate to which an oligonucleotide probe can be coupled, provided that it retains its hybridization characteristics and provided that the background level of hybridization remains low. Usually the solid substrate will be a microtiter plate (e.g. in the DEIA technique disclosed in WO9914377), a membrane (e.g. nylon or nitrocellulose) or a microsphere (bead) or a chip. Prior to application to the membrane or fixation it may be convenient to modify the nucleic acid probe in order to facilitate fixation or improve the hybridization efficiency. Such modifications may encompass homopolymer tailing, coupling with different reactive groups such as aliphatic groups, NH2 groups, SH groups, carboxylic groups, or coupling with biotin, haptens or proteins.
Where there are multiple probes then said probes may be applied in two or more (possibly as many as there are probes) distinct and known positions on a solid substrate. Often it is preferable to apply two or more probes together in one and the same position of said solid support. The invention relates to a solid support attached to 1 or more probes of the present invention.
In one aspect the probes of the invention are coupled to the surface of a bead, for example as described in WO2007082881. The use of beads (or microbeads), such as spherical beads also referred to herein as microspheres, in multiplex analysis has been described previously in, for example, Dunbar SA. (Clin Chim Acta. 2006 January; 363(1-2):71-82) and through the Luminex product information and website (www.Luminexcorp.com). The Luminex system is a bead-based multiplexing (array) technology which has proven to be very powerful for analyzing multiple parameters or analytes within one sample. It delivers results on many bio-assay formats including nucleic acid assays, receptor-ligand assays, immunoassays and enzymatic assays. The use of liquid bead microarrays for HPV detection is discussed in Wallace J et al, (J Mol. Diagn. 2005 February; 7(1):72-80.) Protocols and materials are known and published for Luminex type systems, and are given on the Luminex website in addition to the disclosure on WO2007082881.
Where probes are coupled to beads then hybridisation between a probe and target may take place in a liquid media, and binding of probe to target may be assessed by, for example, flow cytometry.
Detection of binding may also be carried out in the context of a microarray, using for example methods as described in EP373203, EP386229, EP0804731 and EP619321 and incorporated herein by reference. Such techniques are well known to the person skilled in the art.
Suitable example of probes of the invention include DNA sequences which are complementary to their target sequence at all nucleotide positions within the whole or part sequences of SEQ ID 1-SEQ ID 30 and which comprise a nucleotide which is indicated in
Probes of the invention include any probe against the newly identified high risk types identified herein, such as probes against types 20, 30, 61, 67, 69 and 91, or against the variants of HPV 64, 34, or 54 listed in table 1, including but not limited to probes detecting the specific mutations in these sequences identified herein. In one aspect these probes may be used in combination with probes from previously known high risk types.
The probes of the present invention can be used in methods for the identification of HPV types in tissue samples.
In one aspect the invention relates to a method of typing any HPV nucleic acid possibly present in a biological sample comprising the steps of contacting any such nucleic acid with at least one probe of the invention under stringent conditions, and analysing HPV type based upon the hybridisation result so obtained.
In one aspect the invention relates to a method in which an amplification step is carried out to amplify any HPV nucleic acid possibly present in a biological sample prior to the hybridization step. In one aspect the amplification step is non type specific, in that DNA from multiple different HPV types is amplified (also known as broad spectrum PCR). In one aspect any amplified DNA is probed in a non type specific manner to detect the presence of HPV DNA. Such amplification and detection can be carried out using the HPV DEIA technique as described herein and in WO9914377.
Amplification is carried out in one aspect using a primer set which amplifies the 65-base pair fragment from the L1 region of the HPV genome as described in (Kleter et al., J Clin Microbiol. 1999 August; 37(8):2508-17). In one aspect the SPF10 PCR set is used. Alternatively the primers of the MPF system as disclosed in WO2006077102, GP5+6+ system, or combinations of primers from these different sets may be used to amplify the HPV region of interest.
In one aspect any HPV nucleic acid found in a sample is specifically typed, for example by the use of type specific probes of the invention, optionally in combination with other probes or direct sequencing.
As such the invention relates to a method for detection and/or typing of any HPV nucleic acid possibly present in a biological sample, the method comprising the steps of: (i) amplification of a polynucleic acid fragment comprising a region of any HPV nucleic acid in the sample, and (ii) contacting any amplified fragments from step (i) with at least one probe of the invention capable of specific hybridization within the amplified region of HPV, to determine the HPV type.
In one further aspect the invention relates to a process for identification of HPV viral types associated with cervical cancer, the process comprising:
The process further optionally comprises designing probes based upon new HPV viral sequences which allow discrimination between these new types and known HPV DNA types.
Sequence comparisons of nucleic acid identity/homology are readily carried out by the skilled person, for example using the BLAST and BLAST 2.0 algorithms, which are described in Altschul et al., Nucl. Acids Res. 25:3389-3402 (1977), and Altschul et al., J. Mol. Biol. 215:403-410 (1990), respectively. BLAST and BLAST 2.0 can be used, for example with the default parameters, to determine percent sequence identity for the polynucleotide of the invention. Software for performing BLAST analyses is publicly available through the National Center for Biotechnology Information.
In one aspect the invention relates to a kit comprising a probe of the present invention in combination with one or more of the following:
Where there are 2 or more probes these may be immobilised on the same or different supports, and may be labelled or unlabelled.
Primers and probes of components 2) or 3) above may be any suitable primer or probes, such as any of those described in WO9914377, WO03014402, WO2006077102 or WO2007082881, all of which are incorporated by reference herein.
Other components of a kit may include a hybridization buffer, or components necessary for the production of said buffer, or instructions to prepare said buffer; a wash solution, or components necessary for the production of said solution, or instructions to prepare said solution; a means for detection of the hybrids formed; a means for attaching the probe(s) to a known location on a solid support.
Vaccines against HPV are commercially available and rely upon HPV virus like particles formed from the L1 protein, either full length or truncated. The techniques used to produce HPV L1 in the form of VLPs are well known in the art, for example, as disclosed in WO9302184, WO9400152, WO9420137, WO9913056, WO0142780 and WO9611272, all incorporated fully herein by reference.
HPV vaccines may also comprise an adjuvant, such as adjuvants comprising aluminium, or comprising 3D MPL. Other adjuvants are well known in the art and disclosed in the references above.
HPV viruses comprising the sequence of any of SEQ ID no 1-SEQ ID no 30 identified in the present invention may be used in the production of an HPV vaccine, the vaccine suitably being in the form of virus like particles that contain all or part of the HPV L1 protein, using known techniques well documented in the art.
In one aspect the invention relates to an HPV Virus-Like-Particle (VLP) comprising an HPV L1 protein, or fragment thereof, expressed from an L1 sequence comprising any of SEQ ID NO 1-SEQ ID NO 30, or complement thereof.
The present invention has identified in cervical cancer carcinomas novel high risk type variants, novel LR HPV variants, a new high risk type and also the presence of types previously considered to be low risk.
Specifically six HPV types 20, 61, 30, 67, 69, and 91 which were not previously considered to be high risk have been identified in cervical carcinoma samples. This finding has implications for vaccine design, screening and diagnostics. Indeed, type 20 is a cutaneous type not previously associated with cancer before. In addition variants of HPV 64, 34, or 54 have been identified with cervical cancer, and these variants are listed in table 1.
Reference to such variants of HPV 64, 34 and 54 herein as high risk types is a reference to HPV strains having the same discriminatory mutations as disclosed in table 1.
Reference to these types, as with all HPV types listed herein, includes variants of these types. Variants of a type still fall with the definition of that type, as mentioned above in the background section, but may vary by, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more, positions from reference HPV sequences, such as the references sequences given herein.
Thus, the invention relates to kits for identifying the risk of developing cervical cancer, the kits comprising a means to specifically detect one or more of HPV types 20, 61, 30, 67, 69 and 91. In particular the invention relates to kits containing probes specific for HPV types 20, 61, 30, 67, 69 and 91. For the avoidance of doubt probes specific for HPV types 20, 61, 30, 67, 69 and 91 may be probes that detect the specific HPV sequences identified in the present invention, or may be probes against other HPV type 20, 61, 30, 67, 69 and 91 sequences. In an analogous manner the invention relates to kits comprising means to specifically detect variants of HPV 64, 34, or 54 listed in table 1.
The invention also relates to use of probes specific for HPV types 20, 61, 30, 67, 69 and 91 in the screening of tissue samples for the identification of high risk HPV types, and the use of HPV types 20, 61, 30, 67, 69 and 91 in the preparation of a vaccine for prevention or treatment of HPV. In one aspect probes from multiple types in the list of 20, 61, 30, 67, 69 and 91 may be used, for example, use of a probe from HPV 20 and a probe from HPV 61 together is contemplated. In an analogous manner the invention relates to use of probes specific for variants of HPV 64, 34, or 54 listed in table 1.
In one aspect the invention relates to a vaccine for the prevention of cervical cancer comprising an HPV antigen selected from HPV types 20, 61, 30, 67 69 and 91, or nucleic acid encoding said antigen. Said HPV antigen may be any suitable antigen, or combination thereof, such as L1, L2, E1-E7, and in one aspect is the L1 antigen, or immunogenic fragment thereof, or a nucleic acid encoding the same. In an analogous manner the invention relates to a vaccine comprising an antigen selected from the variants of HPV 64, 34, or 54 listed in table 1.
In one aspect the use, or vaccine, as disclosed above comprises HPV 91. In one aspect the use, or vaccine, as disclosed above comprises HPV 20.
The teaching of all references in the present application, including patent applications and granted patents, are herein fully incorporated by reference. Any patent application to which this application claims priority is incorporated by reference herein in its entirety in the manner described herein for publications and references.
For the avoidance of doubt the terms ‘comprising’, ‘comprise’ and ‘comprises’ herein is intended by the inventors to be optionally substitutable with the terms ‘consisting of’, ‘consist of’, and ‘consists of’, respectively, in every instance. Embodiments herein relating to “vaccine compositions” of the invention are also applicable to embodiments relating to “immunogenic compositions” of the invention, and vice versa. The term “about” (or “around”) in all numerical values allows for a 5% variation, i.e. a value of about 1.25% would mean from between 1.19%-1.31%.
It will be understood that particular embodiments described herein are shown by way of illustration and not as limitations of the invention. The principal features of this invention can be employed in various embodiments without departing from the scope of the invention. Those skilled in the art will recognize, or be able to ascertain using no more than routine study, numerous equivalents to the specific procedures described herein. Such equivalents are considered to be within the scope of this invention and are covered by the claims. All publications and patent applications mentioned in the specification are indicative of the level of skill of those skilled in the art to which this invention pertains. All publications and patent applications are herein incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference.
The use of the word “a” or “an” when used in conjunction with the term “comprising” in the claims and/or the specification may mean “one,” but it is also consistent with the meaning of “one or more,” “at least one,” and “one or more than one.” The use of the term “or” in the claims is used to mean “and/or” unless explicitly indicated to refer to alternatives only or the alternatives are mutually exclusive, although the disclosure supports a definition that refers to only alternatives and “and/or.” Throughout this application, the term “about” is used to indicate that a value includes the inherent variation of error for the measurement, the method being employed to determine the value, or the variation that exists among the study subjects.
As used in this specification and claim(s), the words “comprising” (and any form of comprising, such as “comprise” and “comprises”), “having” (and any form of having, such as “have” and “has”), “including” (and any form of including, such as “includes” and “include”) or “containing” (and any form of containing, such as “contains” and “contain”) are inclusive or open-ended and do not exclude additional, unrecited elements or method steps.
The term “or combinations thereof” as used herein refers to all permutations and combinations of the listed items preceding the term. For example, “A, B, C, or combinations thereof is intended to include at least one of: A, B, C, AB, AC, BC, or ABC, and if order is important in a particular context, also BA, CA, CB, CBA, BCA, ACB, BAC, or CAB. Continuing with this example, expressly included are combinations that contain repeats of one or more item or term, such as BB, AAA, BBC, AAABCCCC, CBBAAA, CABABB, and so forth. The skilled artisan will understand that typically there is no limit on the number of items or terms in any combination, unless otherwise apparent from the context.
All statements made concerning one embodiment of the invention may be combined with other embodiments of the invention, unless apparent from the context or explicitly excluded.
All of the compositions and/or methods disclosed and claimed herein can be made and executed without undue experimentation in light of the present disclosure. While the compositions and methods of this invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations may be applied to the compositions and/or methods and in the steps or in the sequence of steps of the method described herein without departing from the concept, spirit and scope of the invention. All such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and concept of the invention as defined by the appended claims.
The present invention is now exemplified with reference to the following examples, which are not limiting upon the invention:
Novel HPV Sequences in Cervical Carcinoma with Single HPV Infections
Identification of the different HPV genotypes in cervical carcinoma specimens is crucial to elucidate the role of the HPV in cervical disease development.
HPV sequences of HPV types (16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, 68, 73 and 82 (Bosch et al., Dis Markers. 2007; 23(4):213-27)) have already been reported to be present as a single infection in cervical carcinomas and are therefore classified oncogenic types. However the carcinogenic potential of certain HPV types is still under debate.
In order to investigate which HPV genotypes are present in cervical carcinoma worldwide, a total of 8785 cervical carcinomas were tested. The aim was to identify the presence of new HPV sequences as a single genotype in cervical carcinoma specimens with the use of a new testing algorithm, based on the established SPF10 LiPA25 system. However, the 22 bp fragment that is used for genotyping in the SPF10 LiPA25 system provides only limited information with respect to the phylogenetic relations between HPV genotypes, and does not allow the characterization of novel HPV genotypes. Therefore the second aim was to obtain additional information of the HPV sequences present in those samples by sequence analysis of DNA segments adjacent to the SPF10 interprimer region.
A segment of 291-bp of the L1 ORF is commonly used for the identification of new papillomavirus types. A new papillomavirus type is recognised if the DNA sequence of the 291-bp fragment of the L10RF differs by more than 10% from the closest known type. Differences in homology of between 2% and 10% define a subtype and those of less than 2% define a variant. (Chan et al., J. Virol. 1995 May; 69(5):3074-83).
Selection of Cases
Histological review by two pathologists was carried out on all specimens via the sandwich method to confirm that only biopsies from cervical cancer cases were included. In this method sections for HPV testing are taken from in between sections in which the lesion was confirmed histologically.
DNA was released from sections of formalin-fixed, paraffin-embedded tissue by overnight treatment with a proteinase K solution (1 mg/ml). Proteinase K was inactivated at 95° C. for 10 min, and 10 μl of (diluted) supernatant was used directly for the SPF10 PCR.
Detection of Novel HPV Sequences with the SPF10-LiPA25 System
Broad-spectrum HPV DNA amplification and HPV genotyping was performed using the SPF10-LiPA25 system (SPF10 HPV LiPA, version 1; manufactured by Labo Bio-Medical Products, Rijswijk, The Netherlands). Briefly, SPF10 PCR amplifies a 65-base pair fragment from the L1 region of the HPV genome (Kleter et al., J Clin Microbiol. 1999 August; 37(8):2508-17). The use of biotinylated reverse primers enabled the capture of the reverse strand of the amplimer onto streptavidin-coated microtiterplates. The captured amplimers were denatured by alkaline treatment, and detected by a defined cocktail of digoxigenin-labeled probes. This method is designated the HPV DEIA, which provides an optical density value and is able to detect more than 50 HPV types (Van Doorn et al., J Clin Microbiol. 2006; 44(9):3292-8). Amplimers from positive samples were used to identify 25 individual HPV genotypes (high-risk HPV: 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, 66, 68, 70, and low-risk HPV: 6, 11, 34, 40, 42-44, 53, 54, 74) simultaneously by reverse hybridisation to DNA probes that are attached to nitrocellulose strips in parallel lines (Kleter et al., J Clin Microbiol. 1999 August; 37(8):2508-17).
Samples that were determined as HPV positive by the HPV DEIA but yielded no HPV genotype with the LiPA25 were selected for further analysis according to the algorithm presented in
A schematic overview of the HPV genome is presented in
Briefly, the PCR with primer set I was performed in a final reaction volume of 50 μl, containing 10 μl of the isolated DNA, 3.5 mM MgCl2, 1× GeneAmp PCR buffer II, 0.2 mM concentrations of deoxynucleoside triphosphates, 7.5 U AmpliTaq Gold DNA polymerase, and primer mix I.
The amplification with primer set II was performed in a final reaction volume of 50 μl, containing 10 μl of the isolated DNA, 3 mM MgCl2, 1× GeneAmp PCR buffer II, 0.2 mM concentrations of deoxynucleoside triphosphates, 7.5 U AmpliTaq Gold DNA polymerase, and primer mix II.
Both amplifications were performed by a 9-min preheating step at 94° C., followed by 40 cycles of amplification comprising 30 s at 94° C., 45 s at 52° C. and 45 s at 72° C. A final elongation step at 72° C. of 5 min ends the PCR.
In case of HPV DEIA positive, but LiPA25 negative samples a reamplification of the 65-base pair SPF10 PCR fragment was performed using extended SPF10 primers. The use of extended primers was necessary to elongate the PCR amplimers that were otherwise too short to allow sequencing analysis of the interprimer 22 bp region. Primers annealing to the extended PCR amplimers were used for sequence analysis of the complete SPF10 PCR fragment. All DNA sequencing was carried out according to the manual of the Big Dye Terminator Cycle Sequencing kit (v1) using the ABI3100 Avant Genetic Analyzer (Applied Biosystems).
The sequences that were found were compared to all HPV sequences present in the National Center for Biotechnology Information database utilizing nucleotidenucleotide BLAST (blastn) (http://www.ncbi.nlm.nih.gov/BLAST/). Some of the sequences, although being highly homologous to HPV sequences, did not show a complete match with any reported HPV sequence. At least one novel mismatch was observed in these sequences. These HPV sequences are shown in
In particular 98 sequences were identified which came from samples that were DEIA positive but LiPA25 negative, and these sequences comprise some known HPV types and variants thereof which were not previously considered to be high risk types and certain novel variants of known high risk types, as outlined in table 2, along with one novel HPV type.
HPV sequences not yet published on Genbank were found as single infection in cervical cancer. These results might open a new discussion towards the focus of current HPV diagnostics and limitations of present assays and studies. Future HPV assays should incorporate these newly found HPV sequences because of their carcinogenic potential.
indicates data missing or illegible when filed
| Number | Date | Country | Kind |
|---|---|---|---|
| 0820822.5 | Nov 2008 | GB | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2009/065078 | 11/12/2009 | WO | 00 | 8/26/2011 |
