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Alternatively spliced, truncated human BRCA2 isoforms contain a novel coding exon.

Marsha D Speevak1, Sean S Young, Harriet Feilotter

  • 1Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ontario, Canada. mspeevak@cvh.on.ca

European Journal of Human Genetics : EJHG
|December 4, 2003
PubMed
Summary
This summary is machine-generated.

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The protein truncation test (PTT) can detect BRCA2 splicing issues. Researchers found alternative splice isoforms in patients, which may be more common in aged blood, not necessarily due to mutations.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • The protein truncation test (PTT) is a method to detect mutations.
  • BRCA2 gene mutations are linked to hereditary breast and ovarian cancers.
  • Abnormal splicing can lead to non-functional proteins.

Purpose of the Study:

  • To investigate alternative splicing in the BRCA2 gene, specifically exons 20-23.
  • To determine if observed splicing abnormalities in high-risk patients are due to mutations or natural variation.

Main Methods:

  • Protein truncation test (PTT) on amplified cDNA and genomic DNA.
  • Sequencing of BRCA2 genomic DNA.
  • Nested reverse transcription polymerase chain reaction (RT-PCR) on RNA from various sources.

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Main Results:

  • Abnormal splicing in BRCA2 exons 20-23 was detected in high-risk breast cancer patients.
  • Sequencing of genomic DNA did not reveal mutations in this region.
  • Alternative splice isoforms were found in patients, healthy individuals, normal tissues, and tumors.
  • These isoforms were more prevalent in aged blood, suggesting conditional expression.

Conclusions:

  • Distinguishing natural alternative splicing from mutation-induced splice defects is crucial for accurate PTT interpretation.
  • Alternative splicing of BRCA2 is a common phenomenon and not always indicative of a pathogenic mutation.
  • Age may influence the expression levels of BRCA2 splice isoforms.