Method of differential display of exposed mRNA by RT/PCR
First Claim
1. A method of comparing the presence or level of individual mRNA molecules in two or more nucleic acid samples, comprising the steps of:
- providing a first nucleic acid sample including mRNA molecules;
providing a second nucleic acid sample including mRNA molecules;
contacting each of said first nucleic acid sample and said second nucleic acid sample with a first oligodeoxynucleotide primer that hybridizes to a first site in mRNAs in said first and second nucleic acid samples;
reverse transcribing said mRNAs to which said first primer hybridizes to produce a first population of DNA strands that are complementary to said mRNAs in said first nucleic acid sample to which said first primer hybridizes, and a second population of DNA strands that are complementary to said mRNAs in said second nucleic acid sample to which said first primer hybridizes;
contacting said first and second populations of DNA strands with a second oligodeoxynucleotide primer that hybridizes to a second site in said first and second populations of DNA strands, which second site includes NNNRNNATGN (SEQ ID NO;
27), said contacting being performed under conditions in which said second primer hybridizes with at least some of the DNA strands in said first and second populations;
extending said second primer to produce a third population of DNA strands that are complementary to the DNA strands in said first population to which said second primer hybridizes, and a fourth population of DNA strands that are complementary to the DNA strands in said second population to which said second primer hybridizes;
amplifying portions of the DNA strands in said first and third populations of DNA strands with said first and second primers to produce a first population of amplification products;
amplifying portions of the DNA strands in said second and fourth populations of DNA strands with said first and second primers to produce a second population of amplification products;
comparing the presence or level of individual amplification products in said first and second populations of amplification products.
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Accused Products
Abstract
A method for isolating mRNAs as cDNAs employs a polymerase amplification method using at least two oligodeoxynucleotide primers. In one approach, the first primer contains sequence capable of hybridizing to a site immediately upstream of the first A ribonucleotide of the mRNA'"'"'s polyA tail and the second primer contains arbitrary sequence. In another approach, the first primer contains sequence capable of hybridizing to a site including the mRNA'"'"'s polyA signal sequence and the second primer contains arbitrary sequence. In another approach, the first primer contains arbitrary sequence and the second primer contains sequence capable of hybridizing to a site including the Kozak sequence. In another approach, the first primer contains a sequence that is substantially complementary to the sequence of a mRNA having a known sequence and the second primer contains arbitrary sequence. In another approach, the first primer contains arbitrary sequence and the second primer contains sequence that is substantially identical to the sequence of a mRNA having a known sequence. The first primer is used as a primer for reverse transcription of the mRNA and the resultant cDNA is amplified with a polymerase using both the first and second primers as a primer set.
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Citations
23 Claims
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1. A method of comparing the presence or level of individual mRNA molecules in two or more nucleic acid samples, comprising the steps of:
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providing a first nucleic acid sample including mRNA molecules; providing a second nucleic acid sample including mRNA molecules; contacting each of said first nucleic acid sample and said second nucleic acid sample with a first oligodeoxynucleotide primer that hybridizes to a first site in mRNAs in said first and second nucleic acid samples; reverse transcribing said mRNAs to which said first primer hybridizes to produce a first population of DNA strands that are complementary to said mRNAs in said first nucleic acid sample to which said first primer hybridizes, and a second population of DNA strands that are complementary to said mRNAs in said second nucleic acid sample to which said first primer hybridizes; contacting said first and second populations of DNA strands with a second oligodeoxynucleotide primer that hybridizes to a second site in said first and second populations of DNA strands, which second site includes NNNRNNATGN (SEQ ID NO;
27), said contacting being performed under conditions in which said second primer hybridizes with at least some of the DNA strands in said first and second populations;extending said second primer to produce a third population of DNA strands that are complementary to the DNA strands in said first population to which said second primer hybridizes, and a fourth population of DNA strands that are complementary to the DNA strands in said second population to which said second primer hybridizes; amplifying portions of the DNA strands in said first and third populations of DNA strands with said first and second primers to produce a first population of amplification products; amplifying portions of the DNA strands in said second and fourth populations of DNA strands with said first and second primers to produce a second population of amplification products; comparing the presence or level of individual amplification products in said first and second populations of amplification products. - 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)
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Specification