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2015 ; 3
(11
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Pseudohypoaldosteronism type 1 and Liddle s syndrome mutations that affect the
single-channel properties of the epithelial Na+ channel
#MMPMID26537344
Boiko N
; Kucher V
; Stockand JD
Physiol Rep
2015[Nov]; 3
(11
): ä PMID26537344
show ga
These studies test whether three disease-causing mutations in genes (SCNN1A and
SCNN1G) encoding subunits of the epithelial Na(+) channel, ENaC, affect the
biophysical and gating properties of this important renal ion channel. The S562P
missense mutation in ?ENaC and the K106_S108delinsN mutation in ?ENaC are
associated with pseudohypoaldosteronism type 1 (PHA1). The N530S missense
mutation in ?ENaC causes Liddle's syndrome. Incorporation of S562P into ?ENaC and
K106_S108N into ?ENaC resulted in significant decreases in macroscopic ENaC
currents. Conversely, incorporation of N530S into ?ENaC increased macroscopic
ENaC current. The S562P substitution resulted in a nonfunctional channel. The
K106_S108N mutation produced a functional channel having a normal macroscopic
current-voltage relation, there was a slight but significant decrease in unitary
conductance and a marked decrease in single-channel open probability. The N530S
substitution increased single-channel open probability having no effect on the
macroscopic current-voltage relation or unitary conductance of the channel. These
findings are consistent with mutation of residues at 562 in ?ENaC and 530 in
?ENaC, and a 3' splice site in SCNN1G (318-1 G?A; K106_108SdelinsN) resulting in
aberrant ENaC activity due to changes in the biophysical and gating properties of
the channel. Such changes likely contribute to the cellular mechanism
underpinning the PHA1 and Liddle's syndrome caused by these mutations in ENaC
subunits.