Rapid identification of mutations in GJC2 in primary lymphoedema using whole exome sequencing combined with linkage analysis with delineation of the phenotype.

نویسندگان

  • Pia Ostergaard
  • Michael A Simpson
  • Glen Brice
  • Sahar Mansour
  • Fiona C Connell
  • Alexandros Onoufriadis
  • Anne H Child
  • Jae Hwang
  • Kamini Kalidas
  • Peter S Mortimer
  • Richard Trembath
  • Steve Jeffery
چکیده

BACKGROUND Primary lymphoedema describes a chronic, frequently progressive, failure of lymphatic drainage. This disorder is frequently genetic in origin, and a multigenerational family in which eight individuals developed postnatal lymphoedema of all four limbs was ascertained from the joint Lymphoedema/Genetic clinic at St George's Hospital. METHODS Linkage analysis was used to determine a locus, and exome sequencing was employed to look for causative variants. RESULTS Linkage analysis revealed cosegregation of a 16.1 Mb haplotype on chromosome 1q42 that contained 173 known or predicted genes. Whole exome sequencing in a single affected individual was undertaken, and the search for the causative variant was focused to within the linkage interval. This approach revealed two novel non-synonymous single nucleotide substitutions within the chromosome 1 locus, in NVL and GJC2. NVL and GJC2 were sequenced in an additional cohort of individuals with a similar phenotype and non-synonymous variants were found in GJC2 in four additional families. CONCLUSION This report demonstrates the power of exome sequencing efficiently applied to a traditional positional cloning pipeline in disease gene discovery, and suggests that the phenotype produced by GJC2 mutations is predominantly one of 4 limb lymphoedema.

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عنوان ژورنال:
  • Journal of medical genetics

دوره 48 4  شماره 

صفحات  -

تاریخ انتشار 2011