Human Molecular Genetics, Vol 6, 1233-1239, Copyright © 1997 by Oxford University Press
SE Lloyd, W Gunther, SH Pearce, A Thomson, ML Bianchi, M Bosio, IW Craig, SE Fisher, SJ Scheinman, O Wrong, TJ Jentsch and RV Thakker
Mutations of the renal-specific chloride channel (CLCN5) gene, which is
located on chromosome Xp11.22, are associated with hypercalciuric
nephrolithiasis (kidney stones) in the Northern European and Japanese
populations. CLCN5 encodes a 746 amino acid channel (CLC-5) that has
approximately 12 transmembrane domains, and heterologous expression of
wild-type CLC-5 in Xenopus oocytes has yielded outwardly rectifying
chloride currents that were markedly reduced or abolished by these
mutations. In order to assess further the structural and functional
relationships of this recently cloned chloride channel, additional CLCN5
mutations have been identified in five unrelated families with this
disorder. Three of these mutations were missense (G57V, G512R and E527D),
one was a nonsense (R648Stop) and one was an insertion (30:H insertion). In
addition, two of the mutations (30:H insertion and E527D) were demonstrated
to be de novo, and the G57V and E527D mutations were identified in families
of Afro-American and Indian origin, respectively. The G57V and 30:H
insertion mutations represent the first CLCN5 mutations to be identified in
the N-terminus region, and the R648Stop mutation, which has been observed
previously in an unrelated family, suggests that this codon may be
particularly prone to mutations. Heterologous expression of the mutations
resulted in a marked reduction or abolition of the chloride currents,
thereby establishing their functional importance. These results help to
elucidate further the structure-function relationships of this renal
chloride channel.
ARTICLES
Characterisation of renal chloride channel, CLCN5, mutations in hypercalciuric nephrolithiasis (kidney stones) disorders
MRC Molecular Endocrinology Group, MRC Clinical Sciences Centre, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK.
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