Quantitative Differences between Aberrant Transcripts Which Occur as Common Isoforms and due to Mutation-based Exon Skipping of the Mismatch Repair Gene hMLH1
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Jens Plaschke
Abstract
About one-third of hereditary non-polyposis colorectal cancer-related mutations in the mismatch repair gene hMLH1 result in the loss of entire exons from the wild type transcripts. Here we describe quantitative differences of hMLH1 transcripts without exon 15, exon 16 or exon 17 in several members of a family with hereditary non-polyposis colorectal cancer. The transcript lacking exon 15 is caused by a G to A transition affecting the last nucleotide of the respective exon and results in a truncated protein. The transcripts lacking exon 16 or exon 17, which are in-frame deletions, were also found in all tested samples of a normal population and represent common isoforms. Reverse transcription-polymerase chain reaction-based relative quantification revealed about 50 % signal intensity for the mutation-based transcript, but less than 10 % for the common isoforms, if compared to the wild type. All aberrant transcripts were detected from blood-derived cDNAs but not from samples of normal colon epithelium. Although the biological significance of the common isoforms is unknown, they might lead to false risk assessment in hereditary non-polyposis colorectal cancer cases.
Copyright © 1999 by Walter de Gruyter GmbH & Co. KG
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- Mitochondrial Disorders. A Diagnostic Challenge in Clinical Chemistry
- Enrichment of Mutant Alleles by Chromatographic Removal of Wild Type Alleles: a New Principle for the Detection of Alleles with Unknown Point Mutations at Excess of Wild Type Alleles
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- Analytical and Clinical Performance of Two Cardiac Troponin I Immunoassays
- Development of an Automated Immunoturbidimetric Ferritin Assay
- Does the Uncertainty of Commonly Performed Glucose Measurements Allow Identification of Individuals at High Risk for Diabetes?
- Autoantibodies against Oxidized LDL in the First Phase of Life
- Recommendations of the German Working Group on Medical Laboratory Testing (AML) on the Introduction and Quality Assurance of Procedures for Point-of-Care Testing (POCT) in Hospitals
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