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2018 ; 7
(3
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Pediatric Dilated Cardiomyopathy-Associated LRRC10 (Leucine-Rich
Repeat-Containing 10) Variant Reveals LRRC10 as an Auxiliary Subunit of Cardiac
L-Type Ca(2+) Channels
#MMPMID29431102
Woon MT
; Long PA
; Reilly L
; Evans JM
; Keefe AM
; Lea MR
; Beglinger CJ
; Balijepalli RC
; Lee Y
; Olson TM
; Kamp TJ
J Am Heart Assoc
2018[Feb]; 7
(3
): ä PMID29431102
show ga
BACKGROUND: Genetic causes of dilated cardiomyopathy (DCM) are incompletely
understood. LRRC10 (leucine-rich repeat-containing 10) is a cardiac-specific
protein of unknown function. Heterozygous mutations in LRRC10 have been suggested
to cause DCM, and deletion of Lrrc10 in mice results in DCM. METHODS AND RESULTS:
Whole-exome sequencing was carried out on a patient who presented at 6 weeks of
age with DCM and her unaffected parents, filtering for rare, deleterious,
recessive, and de novo variants. Whole-exome sequencing followed by trio-based
filtering identified a homozygous recessive variant in LRRC10, I195T.
Coexpression of I195T LRRC10 with the L-type Ca(2+) channel (Ca(v)1.2, ?(2CN2),
and ?(2)? subunits) in HEK293 cells resulted in a significant ?0.5-fold decrease
in I(Ca,L) at 0 mV, in contrast to the ?1.4-fold increase in I(Ca,L) by
coexpression of LRRC10 (n=9-12, P<0.05). Coexpression of LRRC10 or I195T LRRC10
did not alter the surface membrane expression of Ca(v)1.2. LRRC10 coexpression
with Ca(v)1.2 in the absence of auxiliary ?(2CN2) and ?(2)? subunits revealed
coassociation of Ca(v)1.2 and LRRC10 and a hyperpolarizing shift in the voltage
dependence of activation (n=6-9, P<0.05). Ventricular myocytes from Lrrc10(-/-)
mice had significantly smaller I(Ca,L), and coimmunoprecipitation experiments
confirmed association between LRRC10 and the Ca(v)1.2 subunit in mouse hearts.
CONCLUSIONS: Examination of a patient with DCM revealed homozygosity for a
previously unreported LRRC10 variant: I195T. Wild-type and I195T LRRC10 function
as cardiac-specific subunits of L-type Ca(2+) channels and exert dramatically
different effects on channel gating, providing a potential link to DCM.