Our findings demonstrate intrafamilial heterogeneity, namely the presence of GS and CBS phenotypes, in a kindred with the CLCNKB R438H mutation. We conclude that GS can be caused by a mutation in a gene other than SLC12A3. The exact role of the CLCNKB R438H mutation in the pathogenesis of the electrolyte and mineral abnormalities in GS and CBS remains to be established.
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