Method for generating full-length cDNA library from single cells
First Claim
1. A method of generating a complete full-length cDNA library from single cells, comprising the steps of:
- a. providing a plurality of fixed cells, wherein said fixed cells inhibit intracellular messenger RNA degradation and also increase the permeabilisation of said cells for enzyme penetration;
b. incubating said fixed cells in a reverse transcription reaction with a plurality of oligo(dT)n-promoter sequences, wherein said reverse transcription reaction is reverse transcription of a plurality of messenger RNAs by using said oligo(dT)n-promoter as primer, to form a plurality of complementary DNAs from said messenger RNAs;
c. permitting said complementary DNAs in a cDNA tailing and double-stranding reaction to form a plurality of poly(N)-tailed cDNAs, wherein said cDNA tailing and double-stranding reaction is a DNA polymerase and terminal transferase reaction capable of adding multiple copies of the same nucleotide to the tails of said complementary DNAs and then double-stranding said complementary DNAs from the tails;
d. incubating said poly(N)-tailed cDNAs in an in-vitro transcription reaction to generate a plurality of full-length aRNAs, wherein said in-vitro transcription reaction is RNA'"'"'s polymerase reaction capable of synthesizing said full-length RNA'"'"'s from said poly(N)-tailed cDNAs;
e. incubating said full-length aRNAs in said reverse transcription reaction with a plurality of oligo (anti-poly(N))-promoter sequences to form a plurality of full-length cDNAs;
wherein said oligo (anti-poly(N))-promoter sequences are complementary to the poly(N) tails of said poly(N)-tailed cDNAs and f. amplifying said full-length cDNAs with a template-dependent extension of specific primers attached to the poly (dA)-tail and complementary promoter regions of said full-length cDNAs, and thereby providing a complete library enriched in full-length cDNAs from said fixed cells.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides a fast, simple and specific method for generating a complete full-length cDNA library from single cells. The first reverse transcription of intracellular mRNAs with an oligo(dT)n-promoter primer introduces a recognition site for following transcription of newly reverse-transcribed cDNAs. The poly-nucleotide tailing of above cDNAs in addition to aforementioned promoter region further forms binding templates for specific PCR amplification. After repeating the reverse transcription, transcription, reverse transcription and PCR procedure, we can multiply a single copy of mRNA to two billion folds by calculation based upon the comparison between the amount of a synthesized cDNA library and that of theoretically presumed mRNAs within a cell (0.1 pg). In conjunction with a cell fixation and permeabilization step, the complete full-length cDNA library can be directly generated from few single cells without mRNA degradation. The present invention will be very useful in preparing tissue-specific full-length cDNA libraries for future gene chip technology.
-
Citations
44 Claims
-
1. A method of generating a complete full-length cDNA library from single cells, comprising the steps of:
-
a. providing a plurality of fixed cells, wherein said fixed cells inhibit intracellular messenger RNA degradation and also increase the permeabilisation of said cells for enzyme penetration;
b. incubating said fixed cells in a reverse transcription reaction with a plurality of oligo(dT)n-promoter sequences, wherein said reverse transcription reaction is reverse transcription of a plurality of messenger RNAs by using said oligo(dT)n-promoter as primer, to form a plurality of complementary DNAs from said messenger RNAs;
c. permitting said complementary DNAs in a cDNA tailing and double-stranding reaction to form a plurality of poly(N)-tailed cDNAs, wherein said cDNA tailing and double-stranding reaction is a DNA polymerase and terminal transferase reaction capable of adding multiple copies of the same nucleotide to the tails of said complementary DNAs and then double-stranding said complementary DNAs from the tails;
d. incubating said poly(N)-tailed cDNAs in an in-vitro transcription reaction to generate a plurality of full-length aRNAs, wherein said in-vitro transcription reaction is RNA'"'"'s polymerase reaction capable of synthesizing said full-length RNA'"'"'s from said poly(N)-tailed cDNAs;
e. incubating said full-length aRNAs in said reverse transcription reaction with a plurality of oligo (anti-poly(N))-promoter sequences to form a plurality of full-length cDNAs;
wherein said oligo (anti-poly(N))-promoter sequences are complementary to the poly(N) tails of said poly(N)-tailed cDNAs andf. amplifying said full-length cDNAs with a template-dependent extension of specific primers attached to the poly (dA)-tail and complementary promoter regions of said full-length cDNAs, and thereby providing a complete library enriched in full-length cDNAs from said fixed cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A method of performing improved full-length cDNA library synthesis, comprising the steps of:
-
a. preventing a plurality of messenger RNAs from degradation, wherein said messenger RNAs are preserved to be intact in cells;
b. generating a plurality of complementary DNAs from said messenger RNAs, wherein said complementary DNAs are reverse-transcribed from said messenger RNAs;
c. permitting said complementary DNAs to form a plurality of poly(N)-tailed cDNAs, wherein said poly(N)-tailed cDNA contains a full-length complementary DNA sequence flanked with an RNA polymerase promoter in the 5′
-end and a poly-nucleotide tail in the 3′
-end; and
d. amplifying said poly(N)-tailed cDNAs by a plurality of promoter- and tail-dependent extension systems, and thereby providing a complete library of full-length cDNAs from said messenger RNAs. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
-
Specification