Methods for Nucleic Acid Mapping and Identification of Fine Structural Variations in Nucleic Acids

• US 20090156431A1
• Filed: 12/12/2007
• Published: 06/18/2009
• Est. Priority Date: 12/12/2007
• Status: Abandoned Application

• Current Assignee: Si Lok
• Original Assignee: Si Lok
• Inventors: Lok, Si
• Application Number:
  US11/954,947
• Publication Number:
  US 20090156431A1
• Time in Patent Office: Days
• US Class Current: 506/26
• CPC Class Codes: C12N 15/1093 General methods of preparing gene libraries, not provided for in other subgroups
• CPC Class Codes: C12N 15/64 General methods for preparing the vector, for introducing it into the cell or for selecting the vector-containing host
• CPC Class Codes: C12N 15/66 General methods for inserting a gene into a vector to form a recombinant vector using cleavage and ligation; Use of non-functional linkers or adaptors, e.g. linkers containing the sequence for a restriction endonuclease

Abstract

An in vitro, extracellular method of juxtaposing sequence tags (GVTs) where two constituent members of a tag pair (GVT-pair) are unique positional markers of a defined separation distance and/or are markers of nucleic acid positions that demarcate adjacent cleavage sites for one or more different restriction endonucleases along the length of a plurality of target nucleic acid molecules, the method comprising: Fragmenting the target nucleic acid molecule to form target DNA insert; ligating a DNA adaptor having one or more restriction endonuclease recognition sites to both ends of a fragmented target DNA insert and the ligation of the adaptor-ligated target DNA insert to a DNA backbone to create a circular molecule; digesting the adaptor using a restriction endonuclease at the recognition site to cleave the target DNA insert at a defined distance from each end thereof to create two sequence tags (GVTs) comprising terminal sequences of the target DNA insert that are attached to the linear DNA backbone; and recircularizing the linear DNA backbone with the attached GVTs to obtain a circular DNA molecule including a GVT pair having two juxtaposed GVTs; GVT-pair DNA is recovered by nucleic acid amplification.

Claims

1. An in vitro, extracellular method of juxtaposing sequence tags (GVTs) where two constituent members of a tag pair (GVT-pair) are unique positional markers of a defined separation distance in a plurality of target nucleic acid molecules, the method comprising:

fragmenting the target nucleic acid molecule to form target DNA insert;

ligating a DNA adaptor having one or more restriction endonuclease recognition sites to both ends of a fragmented target DNA insert and the ligation of the adaptor-ligated target DNA to a DNA backbone to create a circular molecule;

digesting the adaptor using a type IIS, type IIG, or type III restriction endonuclease at the recognition site to cleave the target DNA insert at a defined distance from each end thereof to create two sequence tags (GVTs) comprising terminal sequences of the target DNA insert that are attached to the linear DNA backbone;

recircularizing the linear DNA backbone with the attached GVTs to obtain a circular DNA molecule including a GVT pair having two juxtaposed GVTs;

isolation of juxtaposed GVT-pair by nucleic acid amplification.

3. The method of claim 1, wherein the target DNA insert is genomic DNA, cDNA, viral DNA, microbial DNA, plastid DNA, chemically synthesized DNA, a DNA product of nucleic acid amplification, or DNA transcribed from RNA.

5. A method according to claim 1, wherein the two constituent members of the tag pair (GVT-pair) that are positional markers flanking two adjacent and cleavable restriction endonuclease sites for one or more restriction endonucleases in the target nucleic acid molecule.

7. The method of claim 1, wherein the target DNA is fragmented randomly by the application of mechanical force, partial digestion with one or more enzymes, or by the complete digestion using one or more restriction endonucleases alone or in combination.

9. The method of claim 1, wherein the fragmented target DNA is size fractionated.

11. The method of claim 1, wherein the fragmented target DNA is not size fractionated.

13. The method of claim 1, wherein the type IIS, IIG or type III restriction endonuclease is used to create the GVT recognizes a six or more base pair uninterrupted recognition sequence.

15. The method of claim 1, wherein the restriction endonuclease is used to create the GVT is Mme I, NmeA III, CstM I, BceA I, Bpm I, BpuE I, Bsg I, BsmF I, BstV1 I, Eco57 I, Eco57M I, or Gsu I.

17. The method of claim 1, wherein the type IIS or IIG restriction endonuclease is used to create the GVT is Mme I.

19. The method of claim 1, wherein the type IIS or type IIG restriction endonuclease is used to create the GVT is CstM I.

21. The method of claim 1, wherein the type IIS or type IIG restriction endonuclease is used to create the GVT is NmeA III.

23. The method of claim 1, wherein the type III restriction endonuclease is used to create the GVT is EcoP15 I, EcoP1 I, Pst II, Hind fIII, StyLT I, LlaF I, BceS I, Hine I, PhaB I, Hpy790545P, Hpy790639 I, or HpyAXIP.

25. The method of claim 1, wherein the type III restriction endonuclease is used to create the GVT is EcoP15 I.

27. The method of claim 1, wherein the type III restriction endonuclease is used to create the GVT is Pst II.

29. The composition of claim 1, wherein the DNA backbone is DNA purified from a biological source, DNA derived from nucleic acid amplification, chemically synthesized DNA, or chemically synthesized DNA containing one or more modified nucleotides.

31. A composition to claim 1, wherein the DNA backbone comprises DNA containing one or more nucleotides conjugated with an affinity purification tag.

33. A composition to claim 1, wherein the DNA backbone comprises DNA containing one or more nucleotides conjugated with a biotin purification tag.

35. A composition of claim 1, wherein the DNA backbone is vector DNA capable of propagation in a cell.

37. A composition of claim 1, wherein the DNA backbone is a bacterial artificial chromosome vector or a yeast artificial chromosome vector.

39. A composition of claim 1, wherein the DNA backbone is vector DNA selected from a group consisting of plasmid, phagemid, cosmid, and fosmid.

2. An in vitro, extracellular method of juxtaposing sequence tags (GVTs) where the two constituent members of a tag pair are unique positional markers of two adjacent and cleavable restriction endonuclease sites of one or more restriction endonucleases along the length of a plurality of target nucleic acid molecules, the method comprising:

fragmenting the target nucleic acid molecule DNA by digestion with one or more restriction endonucleases to form target DNA insert;

ligating a digested target DNA insert to a linear DNA backbone to create a circular DNA molecule whereby the target DNA insert is flanked by a pair of recognition sites for a type IIS, type IIG, or type III restriction endonuclease;

digesting the target DNA insert using a type IIS, type IIG, or type III restriction endonuclease restriction at the recognition site to cleave the target DNA insert at a defined distance from each end of the target DNA insert to create two sequence tags (GVTs) comprising terminal sequences of the target DNA insert that are attached to the linear DNA backbone; and

recircularizing the linear DNA backbone with the attached GVTs to form a circular molecule bearing a GVT-pair comprising two juxtaposed GVTs;

isolation of juxtaposed GVT-pair by nucleic acid amplification.

4. The method of claim 2, wherein the target DNA insert is genomic DNA, cDNA, viral DNA, microbial DNA, plastid DNA, chemically synthesized DNA, a DNA product of nucleic acid amplification, or DNA transcribed from RNA.

6. A method according to claim 2, wherein the two constituent members of the tag pair (GVT-pair) that are positional markers flanking two adjacent and cleavable restriction endonuclease sites for one or more restriction endonucleases in the target nucleic acid molecule.

8. The method of claim 2, wherein the target DNA is fragmented randomly by the application of mechanical force, partial digestion with one or more enzymes, or by the complete digestion using one or more restriction endonucleases alone or in combination.

10. The method of claim 2, wherein the fragmented target DNA is size fractionated.

12. The method of claim 2, wherein the fragmented target DNA is not size fractionated.

14. The method of claim 2, wherein the type IIS, II or type III restriction endonuclease is used to create the GVT recognizes a six or more base pair uninterrupted recognition sequence.

16. The method of claim 2, wherein the restriction endonuclease is used to create the GVT is Mme I, NmeA III, CstM I, BceA I, Bpm I, BpuE I, Bsg I, BsmF I, BstV1 I, Eco57 I, Eco57M I, or Gsu I.

18. The method of claim 2, wherein the type IIS or IIG restriction endonuclease is used to create the GVT is Mme I.

20. The method of claim 2, wherein the type IIS or type IIG restriction endonuclease is used to create the GVT is CstM I.

22. The method of claim 2, wherein the type IIS or type IIG restriction endonuclease is used to create the GVT is NmeA III.

24. The method of claim 2, wherein the type III restriction endonuclease is used to create the GVT is EcoP15 I, EcoP1 I, Pst II, Hind fIII, StyLT I, LlaF I, BceS I, Hine I, PhaB I, Hpy790545P, Hpy790639 I, or HpyAXIP.

26. The method of claim 2, wherein the type III restriction endonuclease is used to create the GVT is EcoP15 I.

30. The composition of claim 2, wherein the DNA backbone is DNA purified from a biological source, DNA derived from nucleic acid amplification, chemically synthesized DNA, or chemically synthesized DNA containing one or more modified nucleotides.

32. A composition to claim 2, wherein the DNA backbone comprises DNA containing one or more nucleotides conjugated with an affinity purification tag.

34. A composition to claim 2, wherein the DNA backbone comprises DNA containing one or more nucleotides conjugated with a biotin purification tag.

36. A composition of claim 2, wherein the DNA backbone is vector DNA capable of propagation in a cell.

38. A composition of claim 2, wherein the DNA backbone is a bacterial artificial chromosome vector or a yeast artificial chromosome vector.

40. A composition of claim 2, wherein the DNA backbone is vector DNA selected from a group consisting of plasmid, phagemid, cosmid, and fosmid.

28. The method of claim L, wherein the type III restriction endonuclease is used to create the GVT is Pst II.