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Sensitive sequencing method for KRAS mutation detection by Pyrosequencing.

Shuji Ogino1, Takako Kawasaki, Mohan Brahmandam

  • 1Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis St., Boston, MA 02115, USA. shuji_ogino@dfci.harvard.edu

The Journal of Molecular Diagnostics : JMD
|July 29, 2005
PubMed
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This study introduces a sensitive Pyrosequencing assay for detecting rare KRAS mutations in tumor DNA. The method accurately quantifies mutant alleles, proving superior to dideoxy sequencing for heterogeneous samples.

Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • Tumors are heterogeneous, comprising neoplastic and non-neoplastic cells.
  • Detecting minority mutant KRAS alleles among wild-type alleles is challenging.

Purpose of the Study:

  • To develop a sensitive DNA sequencing assay for detecting low-frequency KRAS mutations.
  • To compare the efficacy of Pyrosequencing against dideoxy sequencing for mutation detection.

Main Methods:

  • Developed a Pyrosequencing assay for whole-genome-amplified DNA from paraffin-embedded tissues.
  • Assessed assay sensitivity using mixtures of mutant and wild-type KRAS cell line DNA.
  • Evaluated performance on DNA from paraffin-embedded colon and pancreatic cancers.

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Main Results:

  • Pyrosequencing demonstrated superior mutation detection rates compared to dideoxy sequencing.
  • The assay accurately quantified mutant KRAS alleles, with a detection limit of approximately 5%.
  • Pyrosequencing proved effective for heterogeneous samples, including paraffin-embedded tumor tissues.

Conclusions:

  • Pyrosequencing is a simple, robust, and sensitive method for detecting low-frequency KRAS mutations.
  • The assay is particularly valuable for analyzing tumors with abundant non-neoplastic cells.
  • Whole-genome amplification compatibility expands DNA source availability for large-scale studies.