➤ Get the DrugPatentWatch Daily Briefing

Get Daily Updates on Generic Entry, Litigation, Biosimilars, and more …

Serving leading biopharmaceutical companies globally:

Merck
Boehringer Ingelheim
Baxter
Johnson and Johnson
Colorcon
Express Scripts

Last Updated: September 24, 2020

DrugPatentWatch Database Preview

Patent: 6,258,543

➤ Get the DrugPatentWatch Daily Briefing
» See Plans and Pricing

« Back to Dashboard

Summary for Patent: 6,258,543
Title: Quantitation of RNA transcripts using genomic DNA as the internal amplification competitor
Abstract:This invention is directed to methods for the quantitative measurement of specific gene expression levels in biological samples. In one embodiment, methods for the quantitative monitoring of gene expression without either co-amplification of an added template or use of an endogenous constitutive transcript are provided. The former involves a duplex amplification reaction in which a single set of primers is used to amplify both genomic DNA and expressed mRNA from the same gene sequence. These primers are targeted for sequences flanking the splice junction and intron sequences for the mRNA and DNA respectively. By their use, any suitable nucleic acid amplification technology yields mRNA and DNA amplimers which are distinguishable by length and sequence heterogeneity. These amplimers are also present in the final amplification reaction in ratios which are dependent upon the ratios of the expressed mRNA to the DNA in the sample, allowing the quantitation of mRNA in a sample which is normalized to the number of copies of genomic DNA since the genomic DNA acts as the internal quantitation standard, and in effect yields the amount of mRNA per cell. Any detection methodology which can detect amplimers of different lengths or sequences can be used for post amplification quantitation. This strategy may be employed for any gene system in which the mRNA sequence differs from the original genomic DNA sequence. In another embodiment, methods for the quantitative monitoring of gene expression involving determining the ratio of genomic material to expressed mRNA without nucleic acid amplification and/or primer binding are described. This method includes the independent and direct detection of the genomic material and mRNA by complementary probe binding without prior amplification. Additional methods for quantitative measurement of gene expression rates without RNA transcription region introns are described. The invention is useful in gene expression determination in research and commercial applications.
Inventor(s): Gerdes; John C. (Denver, CO), Marmaro; Jeffrey M. (Aurora, CO)
Assignee: Xtrana, Inc. (Denver, CO)
Application Number:09/398,539
Patent Claims:see list of patent claims

Details for Patent 6,258,543

Applicant Tradename Biologic Ingredient Dosage Form BLA Number Approval Date Patent No. Assignee Estimated Patent Expiration Status Orphan Source
Schering INTRON A interferon alfa-2b VIAL 103132 001 1986-06-04   Start Trial Xtrana, Inc. (Denver, CO) 2016-05-02 RX search
Schering INTRON A interferon alfa-2b VIAL 103132 002 1986-06-04   Start Trial Xtrana, Inc. (Denver, CO) 2016-05-02 RX search
Schering INTRON A interferon alfa-2b VIAL 103132 003 1986-06-04   Start Trial Xtrana, Inc. (Denver, CO) 2016-05-02 RX search
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Number >Approval Date >Patent No. >Assignee >Estimated Patent Expiration >Status >Orphan >Source

Make Better Decisions: Try a trial or see plans & pricing

Serving leading biopharmaceutical companies globally:

Merck
Harvard Business School
Baxter
Dow
Moodys
Colorcon

Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. thinkBiotech performs no independent verification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.