Abstract:
:Liddle syndrome is a mendelian form of hypertension characterized by constitutively elevated renal Na reabsorption that can result from activating mutations in the beta or gamma subunit of the epithelial Na channel. All reported mutations have deleted the last 45-76 normal amino acids from the cytoplasmic C terminus of one of these channel subunits. While these findings implicate these terminal segments in the normal negative regulation of channel activity, they do not identify the amino acid residues that are critical targets for these mutations. Potential targets include the short highly conserved Pro-rich segments present in the C terminus of beta and gamma subunits; these segments are similar to SH3-binding domains that mediate protein-protein interaction. We now report a kindred with Liddle syndrome in which affected patients have a mutation in codon 616 of the beta subunit resulting in substitution of a Leu for one of these highly conserved Pro residues. The functional significance of this mutation is demonstrated both by the finding that this is a de novo mutation appearing concordantly with the appearance of Liddle syndrome in the kindred and also by the marked activation of amiloride-sensitive Na channel activity seen in Xenopus oocytes expressing channels containing this mutant subunit (8.8-fold increase compared with control oocytes expressing normal channel subunits; P = 0.003). These findings demonstrate a de novo missense mutation causing Liddle syndrome and identify a critical channel residue important for the normal regulation of Na reabsorption in humans.
journal_name
Proc Natl Acad Sci U S Aauthors
Hansson JH,Schild L,Lu Y,Wilson TA,Gautschi I,Shimkets R,Nelson-Williams C,Rossier BC,Lifton RPdoi
10.1073/pnas.92.25.11495subject
Has Abstractpub_date
1995-12-05 00:00:00pages
11495-9issue
25eissn
0027-8424issn
1091-6490journal_volume
92pub_type
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