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No evidence of genetic anticipation in a large family with Lynch syndrome

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Abstract

Lynch syndrome is the commonest inherited cause of colorectal cancer (CRC). Genetic anticipation occurs when the age of onset of a disorder decreases in successive generations. It is controversial whether this occurs in Lynch syndrome. Previous studies have included heterogenous groups of subjects from multiple families, including subjects with a clinical diagnosis (based on family history) as well as those with proven germline mismatch repair gene mutations. The purpose of this study was to determine whether genetic anticipation occurs in mismatch repair gene carriers from a single Lynch syndrome family. This study includes members of a single family known to carry an MLH1 gene mutation who are proven germline mutation carriers or obligate carriers (based on their offspring’s mutation status). Evidence of genetic anticipation (determined by age of onset of first CRC) was sought in two ways: Firstly, subjects were grouped as parent-child pairs and individuals were compared with their own offspring; secondly they were grouped by generation within the family tree. The Kaplan–Meier technique was used to adjust for variable follow up times. The family tree consisted of 714 subjects. Ninety-two subjects over five generations were included in the study. There was no evidence of genetic anticipation over the generations. (P = 0.37). Similarly, in the 75 parent–child pairs identified, age of onset of CRC was similar for parents and children (P = 0.51). We could not identify any evidence of genetic anticipation in mutation carriers from a single family with Lynch syndrome.

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Authors and Affiliations

  1. Department of Surgery, Deakin University, Geelong, Australia

    D. Stupart

  2. Colorectal Unit, Department of Surgery, University of Cape Town, Cape Town, South Africa

    P. Goldberg & U. Algar

  3. MRC Human Genetics Research Unit, Division of Human Genetics, Faculty of Health Sciences, Institute for Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa

    A. Vorster & R. Ramesar

Authors
  1. D. Stupart
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  2. P. Goldberg
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  3. U. Algar
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  4. A. Vorster
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  5. R. Ramesar
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Correspondence to D. Stupart.

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Stupart, D., Goldberg, P., Algar, U. et al. No evidence of genetic anticipation in a large family with Lynch syndrome. Familial Cancer 13, 29–34 (2014). https://doi.org/10.1007/s10689-013-9669-0

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  • DOI: https://doi.org/10.1007/s10689-013-9669-0

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