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2016 ; 11
(5
): e0156456
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Dominant-Negative Effect of a Missense Variant in the TASK-2 (KCNK5) K+ Channel
Associated with Balkan Endemic Nephropathy
#MMPMID27228168
Reed AP
; Bucci G
; Abd-Wahab F
; Tucker SJ
PLoS One
2016[]; 11
(5
): e0156456
PMID27228168
show ga
TASK-2, a member of the Two-Pore Domain (K2P) subfamily of K+ channels, is
encoded by the KCNK5 gene. The channel is expressed primarily in renal epithelial
tissues and a potentially deleterious missense variant in KCNK5 has recently been
shown to be prevalent amongst patients predisposed to the development of Balkan
Endemic Nephropathy (BEN), a chronic tubulointerstitial renal disease of unknown
etiology. In this study we show that this variant (T108P) results in a complete
loss of channel function and is associated with a major reduction in TASK-2
channel subunits at the cell surface. Furthermore, these mutant subunits have a
suppressive or 'dominant-negative' effect on channel function when coexpressed
with wild-type subunits. This missense variant is located at the extracellular
surface of the M2 transmembrane helix and by using a combination of structural
modelling and further functional analysis we also show that this highly-conserved
threonine residue is critical for the correct function of other K2P channels.
These results therefore provide further structural and functional insights into
the possible pathophysiological effects of this missense variant in TASK-2.
|*Mutation, Missense
[MESH]
|Amino Acid Substitution
[MESH]
|Animals
[MESH]
|Balkan Nephropathy/genetics/*metabolism
[MESH]
|Humans
[MESH]
|Oocytes/metabolism
[MESH]
|Potassium Channels, Tandem Pore Domain/*chemistry/genetics/*metabolism
[MESH]