Method to generate or determine nucleic acid tags corresponding to the terminal ends of DNA molecules using sequences analysis of gene expression (terminal SAGE)
First Claim
1. A method of obtaining a nucleotide sequence tag from a terminus of a nucleic acid, the method comprising the steps of:
- (a) providing a first nucleic acid sequence comprising a full-length first strand cDNA comprising a 5′
untranslated region, a coding sequence, a 3′
untranslated region and a poly A tail;
(b) without prior cleavage of said first nucleic acid sequence, linking the 5′
end of said full length first strand cDNA to a linker sequence to form a linked nucleic acid, in which the linker sequence comprises;
(i) a first recognition site for a first nucleic acid cleavage enzyme that allows cleavage of the first nucleic acid sequence at a site distant from the first recognition site, and(ii) a second recognition site for a second nucleic acid cleavage enzyme that allows nucleic acid cleavage at a site distant from the second recognition site, said cleavage site located at a position within the first recognition site;
in which the linked nucleic acid has the structure;
5′
-second recognition site-first recognition site-first nucleic acid-3′
(c) cleaving the linked nucleic acid with the first nucleic acid cleavage enzyme to provide;
(i) a linked tag comprising the linker sequence linked to a nucleotide sequence tag representative of the first nucleic acid sequence, the nucleotide sequence tag comprising the 5′
terminus of the full length first strand cDNA; and
(ii) a second nucleic acid sequence comprising a remainder portion of the first nucleic acid.
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Accused Products
Abstract
A method of providing an indication of an instance of expression of a gene is described herein, the method which may comprise the steps of: (a) providing a complementary deoxyribonucleic acid (cDNA) having a terminus comprising a terminal transcribed sequence of a gene; (b) linking the cDNA to an linker sequence thereby forming a linked nucleic acid, in which the linker sequence comprises a first recognition site for a first nucleic acid cleavage enzyme, preferably a restriction endonuclease, that allows nucleic acid cleavage at a site distant from the first recognition site; and (c) cleaving the linked nucleic acid with the first nucleic acid cleavage enzyme to provide a linked tag, in which the linked tag comprises a nucleotide sequence tag representative of a terminal transcribed sequence of the gene; and (d) detecting the presence or identity of the linked tag or the nucleotide sequence tag to provide an indication of an instance of gene expression.
4 Citations
10 Claims
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1. A method of obtaining a nucleotide sequence tag from a terminus of a nucleic acid, the method comprising the steps of:
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(a) providing a first nucleic acid sequence comprising a full-length first strand cDNA comprising a 5′
untranslated region, a coding sequence, a 3′
untranslated region and a poly A tail;(b) without prior cleavage of said first nucleic acid sequence, linking the 5′
end of said full length first strand cDNA to a linker sequence to form a linked nucleic acid, in which the linker sequence comprises;(i) a first recognition site for a first nucleic acid cleavage enzyme that allows cleavage of the first nucleic acid sequence at a site distant from the first recognition site, and (ii) a second recognition site for a second nucleic acid cleavage enzyme that allows nucleic acid cleavage at a site distant from the second recognition site, said cleavage site located at a position within the first recognition site;
in which the linked nucleic acid has the structure;
5′
-second recognition site-first recognition site-first nucleic acid-3′(c) cleaving the linked nucleic acid with the first nucleic acid cleavage enzyme to provide; (i) a linked tag comprising the linker sequence linked to a nucleotide sequence tag representative of the first nucleic acid sequence, the nucleotide sequence tag comprising the 5′
terminus of the full length first strand cDNA; and(ii) a second nucleic acid sequence comprising a remainder portion of the first nucleic acid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification