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Related Experiment Videos

A complete protein truncation test for BRCA1 and BRCA2

A M Garvin1

  • 1Department of Research, Kantonsspital, Basel, Switzerland. garvin@ubaclu.unibas.ch

European Journal of Human Genetics : EJHG
|October 22, 1998
PubMed
Summary

The protein truncation test (PTT) is a fast method for detecting mutations in tumor suppressor genes like BRCA1/2. Optimizing PTT by considering segment design and inhibiting nonsense-mediated mRNA decay can improve its accuracy for mutation screening.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The protein truncation test (PTT) is a rapid method for identifying novel mutations in tumor suppressor genes.
  • BRCA1/2 genes are crucial tumor suppressors, and mutations are common in hereditary cancers.
  • PTT allows screening of large coding sequences efficiently using PCR and in vitro transcription/translation.

Purpose of the Study:

  • To evaluate the effectiveness of PTT for screening BRCA1/2 mutations.
  • To identify factors influencing the false negative rate of PTT.
  • To propose optimization strategies for improving PTT accuracy in mutation detection.

Main Methods:

  • Screening of the 16 kb BRCA1/2 coding sequence using nine overlapping segments.
  • Utilizing coupled in vitro transcription/translation and SDS-PAGE for protein product analysis.
  • Investigating the impact of segment design, gel parameters, and nonsense-mediated mRNA decay (NMD).

Main Results:

  • PTT can screen large coding sequences, with BRCA1/2 requiring nine segments.
  • Theoretical false negative rate for BRCA1/2 mutations is 10%, but practical rates are higher, especially with cDNA.
  • Factors like segment design, gel conditions, and NMD significantly affect PTT accuracy.

Conclusions:

  • PTT is a valuable tool for detecting mutations in tumor suppressor genes, including BRCA1/2.
  • Optimization of PTT parameters is essential to minimize false negatives.
  • Inhibiting NMD, for example, with cycloheximide, can enhance PTT effectiveness.

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