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Last Updated: May 30, 2023

Patent: 5,989,873

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Summary for Patent: 5,989,873
Title: Method of detecting gene expression and/or of preventing such expression in cells
Abstract:A method of amplifying a nucleotide sequence complementary to an mRNA template derived from genomic DNA. The method involves the following steps. A sample mixture containing an mRNA template and corresponding genomic DNA is provided, the genomic DNA including at least two exons separated by at least one intron. A pair of intron-blockers are introduced into the mixture, the intron-blockers comprising a sequence of intron-specific oligonucleotides modified to prevent nucleotide extension in conditions promoting polymerase chain reaction. A primer pair promoting amplification of cDNA derived from the mRNA template is introduced into the mixture and then reverse transcription polymerase chain reaction is carried out to amplify cDNA. Detection of the cDNA is proof of the existence of mRNA in the sample, and thus proof of expression of the corresponding gene. The method avoids false positives caused by amplification of genomic DNA as well as cDNA based on an mRNA template. The invention includes a method of suppressing gene expression in vivo, which comprises exposing cells containing a gene to be suppressed, made up of exons and at least one intron, to intron-blockers having nucleotide sequences that bind to the intron to prevent gene expression.
Inventor(s): Vinayagamoorthy; Thuraiayah (Saskatoon, Saskatchewan, CA), Schloss; Eric (Edmonton, Alberta, CA)
Application Number:08/929,302
Patent Claims:see list of patent claims

Details for Patent 5,989,873

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Merck Sharp & Dohme Corp. INTRON A interferon alfa-2b For Injection 103132 06/04/1986 ⤷  Try a Trial 2016-09-24
Merck Sharp & Dohme Corp. INTRON A interferon alfa-2b For Injection 103132 ⤷  Try a Trial 2016-09-24
Merck Sharp & Dohme Corp. INTRON A interferon alfa-2b Injection 103132 ⤷  Try a Trial 2016-09-24
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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