Methods for preparing cDNA from low quantities of cells
First Claim
1. A method of preparing cDNA from one or more cells, comprising sequentially(a) preparing single stranded cDNA from cellular RNA of the one or more cells by a reverse transcription (RT) reaction comprising(1) denaturing the cellular RNA;
- (2) annealing one or more RT primers to the cellular RNA; and
(3) extending the RT primers to form the cDNA;
wherein the sequences of cellular RNA consist of RNA sequences from the one or more cells;
(b) preparing double stranded cDNA by second strand synthesis of the single stranded cDNA;
(c) circularizing the double stranded cDNA; and
(d) amplifying the circularized double stranded cDNA by a multiple displacement amplification (MDA) reaction comprising annealing one or more MDA primers to the cDNA and extending the MDA primers with a phi29 DNA polymerase to form a cDNA library representative of the mRNA transcriptome or whole RNA transcriptome of the one or more cells;
wherein steps (a) through (c) are carried out in the absence of active DNA endonuclease.
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Abstract
Methods for preparing cDNA libraries from single and low quantities of cells are disclosed. The methods are based on the principles of multi-strand displacement amplification or semi-random primed polymerase chain reaction. The methods typically include a step of reverse transcription and subsequent amplification of cDNA. The methods can be adapted for preparation of cDNA libraries that are representative of mRNA or whole RNA expressed by the cell or cells. The cDNA is suitable for sequencing or microarray analysis.
37 Citations
20 Claims
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1. A method of preparing cDNA from one or more cells, comprising sequentially
(a) preparing single stranded cDNA from cellular RNA of the one or more cells by a reverse transcription (RT) reaction comprising (1) denaturing the cellular RNA; -
(2) annealing one or more RT primers to the cellular RNA; and (3) extending the RT primers to form the cDNA; wherein the sequences of cellular RNA consist of RNA sequences from the one or more cells; (b) preparing double stranded cDNA by second strand synthesis of the single stranded cDNA; (c) circularizing the double stranded cDNA; and (d) amplifying the circularized double stranded cDNA by a multiple displacement amplification (MDA) reaction comprising annealing one or more MDA primers to the cDNA and extending the MDA primers with a phi29 DNA polymerase to form a cDNA library representative of the mRNA transcriptome or whole RNA transcriptome of the one or more cells;
wherein steps (a) through (c) are carried out in the absence of active DNA endonuclease. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification