Detection of APC mosaicism by next-generation sequencing in an FAP patient

J Hum Genet. 2015 May;60(5):227-31. doi: 10.1038/jhg.2015.14. Epub 2015 Feb 26.


Familial adenomatous polyposis (FAP) of the colon is characterized by multiple polyps in the intestine and extra-colonic manifestations. Most FAP cases are caused by a germline mutation in the tumor-suppressor gene APC, but some cases of adenomatous polyposis result from germline mutations in MUTYH, POLD1 or POLE. Although sequence analysis of APC by the Sanger method is routinely performed for genetic testing, there remain cases whose mutations are not detected by the analysis. Next-generation sequencing has enabled us to analyze the comprehensive human genome, improving the chance of identifying disease causative variants. In this study, we conducted whole-genome sequencing of a sporadic FAP patient in which we did not find any pathogenic APC mutations by the conventional Sanger sequencing. Whole-genome sequencing and subsequent deep sequencing identified a mosaic mutation of c.3175G>T, p.E1059X in ~12% of his peripheral leukocytes. Additional deep sequencing of his buccal mucosa, hair follicles, non-cancerous mucosa of the stomach and colon disclosed that these tissues harbored the APC mutation at different frequencies. Our data implied that genetic analysis by next-generation sequencing is an effective strategy to identify genetic mosaicism in hereditary diseases.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenomatous Polyposis Coli / genetics*
  • Adenomatous Polyposis Coli Protein / genetics*
  • Adult
  • Base Sequence
  • DNA Mutational Analysis
  • Gene Frequency
  • Germ-Line Mutation
  • High-Throughput Nucleotide Sequencing
  • Humans
  • Male
  • Mosaicism*


  • APC protein, human
  • Adenomatous Polyposis Coli Protein