Methods and compositions for generating full-length cDNA having arbitrary nucleotide sequence at the 3'-end
First Claim
1. A template switching oligonucleotide capable of selectively interacting with a 5'"'"' CAP structure of a full-length mRNA-cDNA intermediate generated by reverse transcription of mRNA, wherein when said template switching oligonucleotide interacts with said 5'"'"' CAP structure of said full-length mRNA-cDNA intermediate, said template switching oligonucleotide is capable of serving as a template for additional reverse transcription such that a sequence complementary to said template switching oligonucleotide is incorporated at a 3'"'"'-end of a cDNA.
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Abstract
Described are compositions and methods which allow for the efficient addition of a defined sequence at the 3'"'"'-end of a full-length cDNA in the course of first-strand cDNA synthesis from an mRNA template. A cDNA synthesis primer that is capable of annealing to mRNA is used to prime the first strand synthesis reaction. An oligonucleotide that is linked to the 5'"'"'-end of the mRNA serves as a short, extended template such that when the reverse transcriptase enzyme reaches the 5'"'"'-end of the mRNA, the enzyme switches templates and proceeds to transcribe through the end of the linked oligonucleotide. As a result, the single-stranded cDNA product which corresponds to the full-length mRNA, will have at the 3'"'"'-end a defined sequence which is complementary to the linked oligonucleotide. A conservative element in the oligonucleotide sequence responsible for this reaction can include 3 to 5 guanylic acid residues at the 3'"'"'-end of the oligonucleotide. The subject invention provides for the increased synthesis of full-length cDNA from mRNA templates. The full-length cDNA prepared according to the present invention can then be amplified using PCR or cloned using standard procedures.
186 Citations
15 Claims
- 1. A template switching oligonucleotide capable of selectively interacting with a 5'"'"' CAP structure of a full-length mRNA-cDNA intermediate generated by reverse transcription of mRNA, wherein when said template switching oligonucleotide interacts with said 5'"'"' CAP structure of said full-length mRNA-cDNA intermediate, said template switching oligonucleotide is capable of serving as a template for additional reverse transcription such that a sequence complementary to said template switching oligonucleotide is incorporated at a 3'"'"'-end of a cDNA.
Specification