Claims
- 1. A method of isolating a nucleic acid molecule of interest from a mixture of nucleic acid molecules, comprising:
(i) providing a recombinant nucleic acid library comprising a heterogeneous population of circular template nucleic acid molecules modified such that they are selectively digestible by an enzyme; (ii) contacting the library with a first primer and a second primer, said primers capable of annealing to complementary strands of a nucleic acid molecule of interest present in the library to produce an annealed mixture, and wherein
the two primers extend in opposite directions relative to each other during primer extension; and the 5′ ends of the two primers are adjacent to each other; (iii) subjecting the annealed mixture to conditions under which primer extension occurs, thereby producing a reaction mixture containing linear primer extension products; (iv) digesting the mixture containing linear primer extension products with the enzyme of (i), wherein said enzyme selectively digests template nucleic acid molecules but not the primer extension products, resulting in a population enriched for the nucleic acid molecule of interest.
- 2. The method of claim 1, wherein the two primers are phosphorylated on their 5′ ends.
- 3. The method of claim 2, further comprising ligating the linear primer extension products prior to the digesting step to produce circular primer extension products.
- 4. The method of claim 2, further comprising, after the digesting step, isolating the primer extension products and ligating the isolated products.
- 5. The method of claim 4, wherein the primer extension products are isolated by gel purification.
- 6. The method of claim 1, wherein the enzyme is a restriction endonuclease.
- 7. The method of claim 6, wherein the template circular nucleic acid molecules of (i) are methylated and the enzyme is a restriction endonuclease.
- 8. The method of claim 1, wherein the library comprises nucleic acid molecules obtained from two or more tissue sources.
- 9. The method of claim 1, wherein the nucleic acid library is a double-stranded DNA library.
- 10. The method of claim 1, wherein the nucleic acid library is a human cDNA library.
- 11. The method of claim 1, wherein the recombinant DNA library is a human genomic DNA library.
- 12. The method of claim 1, wherein the nucleic acid molecule of interest is represented in the library at a frequency of equal to or less than one in 5×105 clones.
- 13. The method of claim 1, wherein the nucleic acid molecule of interest is represented in the library at a frequency of equal to or less than one in 1×106 clones.
- 14. The method of claim 3, further comprising transforming the circular primer extension products into a suitable host cell after the digesting step, to generate clones.
- 15. The method of claim 14, wherein the host cell is a competent bacterial host cell.
- 16. The method of claim 14, further comprising screening the clones to identify the clone containing the nucleic acid molecule of interest.
- 17. The method of claim 14, further comprising sequencing the nucleic acid isolated from the clones.
- 18. The method of claim 8, wherein the library is provided as a microarray and two or more nucleic acid molecules of interest are isolated simultaneously.
- 19. The method of claim 1, wherein multiple DNA libraries are provided in a single mix.
- 20. The method of claim 19, wherein greater than 50 cDNA libraries are in the single mix.
Parent Case Info
[0001] This is a continuation application filed under 37 CFR 1.53(b) of application serial no. 10/119,466, filed Apr. 9, 2002, which is a continuation claiming priority to application Ser. No. 09/480,782 filed Jan. 10, 2000, which claims priority under Section 119(e) to provisional application No. 60/128,849 filed on Apr. 12, 1999, which applications are incorporated herein in their entirety by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60128849 |
Apr 1999 |
US |
Continuations (2)
|
Number |
Date |
Country |
Parent |
10119466 |
Apr 2002 |
US |
Child |
10413053 |
Apr 2003 |
US |
Parent |
09480782 |
Jan 2000 |
US |
Child |
10119466 |
Apr 2002 |
US |