4.8 Article

Germline variants in the SEMA4A gene predispose to familial colorectal cancer type X

Journal

NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -

Publisher

NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms6191

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Funding

  1. Austrian National Bank
  2. Anniversary Fund [13918]
  3. Land Steiermark
  4. Leukamiehilfe Steiermark
  5. 'Vereinigung Forschungsforderung' at Medical University of Graz, Austria (MUG)
  6. Austrian Society of Hematology and Oncology
  7. PhD programme 'Molecular Medicine' at MUG

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Familial colorectal cancer type X (FCCTX) is characterized by clinical features of hereditary non-polyposis colorectal cancer with a yet undefined genetic background. Here we identify the SEMA4A p.Val78Met germline mutation in an Austrian kindred with FCCTX, using an integrative genomics strategy. Compared with wild-type protein, SEMA4A(V78M) demonstrates significantly increased MAPK/Erk and PI3K/Akt signalling as well as cell cycle progression of SEMA4A-deficient HCT-116 colorectal cancer cells. In a cohort of 53 patients with FCCTX, we depict two further SEMA4A mutations, p.Gly484Ala and p.Ser326Phe and the single-nucleotide polymorphism (SNP) p.Pro682Ser. This SNP is highly associated with the FCCTX phenotype exhibiting increased risk for colorectal cancer (OR 6.79, 95% CI 2.63 to 17.52). Our study shows previously unidentified germline variants in SEMA4A predisposing to FCCTX, which has implications for surveillance strategies of patients and their families.

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