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J Med Genet. 2011 Apr;48(4):251-5. doi: 10.1136/jmg.2010.085563. Epub 2011 Jan 25.

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

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  • 1Medical Genetics, St George's, University of London, and Guy's Hospital, London SW17 ORE, UK.

Abstract

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.

PMID:
21266381
[PubMed - indexed for MEDLINE]
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