Human Molecular Genetics, Vol 5, 293-299, Copyright © 1996 by Oxford University Press
SS Strautnieks, RJ Thompson, A Hanukoglu, MJ Dillon, I Hanukoglu, U Kuhnle, J Seckl, RM Gardiner and E Chung
Pseudohypoaldosteronism type 1 (PHA1, OMIM 264350) is a rare Mendelian
disorder characterised by end-organ unresponsiveness to mineralocorticoids.
Most steroid hormone insensitivity syndromes arise from mutations in the
corresponding receptor, but available genetic evidence is against
involvement of the mineralocorticoid receptor gene, MLR, in PHA1. A
complete genome scan for PHA1 genes was undertaken using homozygosity
mapping in 11 consanguineous families. Conclusive evidence of linkage with
heterogeneity was obtained with a maximum two- locus admixture lod score of
9.9. The disease locus mapped to chromosome 16p12.2-13.11 in six families
and to 12p13.1-pter in the other five families. The two chromosomal regions
harbour genes for subunits of the amiloride-sensitive epithelial sodium
channel: SCNN1B and SCNN1G on 16p and SCNN1A on 12p. Liddle's syndrome of
hypertension and pseudoaldosteronism has been shown to arise from mutations
in SCNN1B and SCNN1G. These results strongly suggest that PHA1 and Liddle's
syndrome are allelic variants caused by mutations in genes encoding
subunits of this sodium channel. These genes are of broad biological
interest both in relation to sodium and water homeostasis in mammals and by
virtue of their homology to the mec genes of Caenorhabditis elegans
involved in mechanosensitivity and neuronal degeneration.
ARTICLES
Localisation of pseudohypoaldosteronism genes to chromosome 16p12.2- 13.11 and 12p13.1-pter by homozygosity mapping
Department of Paediatrics, University College London Medical School, UK.
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