Methods of measuring gene expression using wax-embedded tissue specimens
First Claim
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1. A method for the production of cDNA representative of complete representational cellular mRNA from a wax-embedded biological sample comprising:
- (a) extracting RNA from the wax-embedded sample by removing the DNA in the biological sample with a DNAse and without a step to selectively eliminate rRNA by selection for polyadenylated RNA to produce sample cellular RNA; and
then (b) synthesizing a first strand of cDNA complementary to the sample cellular mRNA by contacting the sample RNA to one or more oligonucleotides and a reverse transcriptase to create single strand cDNA copies of the cellular RNA representative of the complete cellular mRNA; and
(c) ligating a pair of complementary oligonucleotide adaptors to the cDNA wherein the adaptors are of different lengths.
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Abstract
This invention provides methods for the isolation of complete representation of cellular messenger ribonucleic acid from wax-embedded tissue samples. Expression of genes of interest can thus be fortuitously determined and cDNA probes can be readily developed.
33 Citations
16 Claims
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1. A method for the production of cDNA representative of complete representational cellular mRNA from a wax-embedded biological sample comprising:
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(a) extracting RNA from the wax-embedded sample by removing the DNA in the biological sample with a DNAse and without a step to selectively eliminate rRNA by selection for polyadenylated RNA to produce sample cellular RNA; and
then(b) synthesizing a first strand of cDNA complementary to the sample cellular mRNA by contacting the sample RNA to one or more oligonucleotides and a reverse transcriptase to create single strand cDNA copies of the cellular RNA representative of the complete cellular mRNA; and
(c) ligating a pair of complementary oligonucleotide adaptors to the cDNA wherein the adaptors are of different lengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14)
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11. A method for the production of cDNA representative of complete representational cellular mRNA from a wax-embedded biological sample comprising:
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(a) extracting RNA from the wax-embedded sample by removing the DNA in the biological sample with a DNAse and without a step to selectively eliminate rRNA by selection for polyadenylated RNA to produce sample cellular RNA;
(b) synthesizing a first strand of cDNA complementary to the sample cellular mRNA by contacting the sample RNA to one or more oligonucleotides and a reverse transcriptase to create single strand cDNA copies of the cellular RNA representative of the complete cellular mRNA;
(c) synthesizing complementary DNA strands to the cDNA copies to create double-stranded cDNA;
(d) ligating a pair of complementary oligonucleotide adaptors to the cDNA wherein the adaptors are of different lengths; and
wherein one of the adaptors in the pair is about 6 to 18 nucleotides in length and shorter than the other adaptor.
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12. A method for the production of cDNA representative of complete representational cellular mRNA from a wax-embedded biological sample comprising:
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(a) extracting RNA from the wax-embedded sample by removing the DNA in the biological sample with a DNAse and without a step to selectively eliminate rRNA by selection for polyadenylated RNA to produce sample cellular RNA;
(b) synthesizing a first strand of cDNA complementary to the sample cellular mRNA by contacting the sample RNA to one or more oligonucleotides and a reverse transcriptase to create single strand cDNA copies of the cellular RNA representative of the complete cellular mRNA;
(c) synthesizing complementary DNA strands to the cDNA copies to create double-stranded cDNA; and
(d) ligating a pair of complementary oligonucleotide adaptors to the cDNA wherein the adaptors are of different lengths and arc not homologous to DNA in the biological sample.
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15. A method for comparing and quantifying expression of at least three genes of interest in a wax-embedded biological source comprising,
(a) extracting mRNA from a wax-embedded biological source to obtain complete representational cellular mRNA present in the source; -
(b) synthesizing cDNA probes corresponding to the complete representational RNA; and
(c) contacting the cDNA probes with DNA representative of at least three different genes and detecting the proportionate copy number of the cDNA probes complementary to DNA from the different genes. - View Dependent Claims (16)
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Specification