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Deprecated: Implicit conversion from float 302.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Am+Heart+Assoc 2018 ; 7 (3): ä Nephropedia Template TP
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Pediatric Dilated Cardiomyopathy?Associated LRRC10 (Leucine?Rich Repeat?Containing 10) Variant Reveals LRRC10 as an Auxiliary Subunit of Cardiac L?Type Ca2+ 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 PMID29431102show 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 Ca2+ channel (Cav1.2, ?2CN2, and ?2? subunits) in HEK293 cells resulted in a significant ?0.5?fold decrease in ICa,L at 0 mV, in contrast to the ?1.4?fold increase in ICa,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 Cav1.2. LRRC10 coexpression with Cav1.2 in the absence of auxiliary ?2CN2 and ?2? subunits revealed coassociation of Cav1.2 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 ICa,L, and coimmunoprecipitation experiments confirmed association between LRRC10 and the Cav1.2 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 Ca2+ channels and exert dramatically different effects on channel gating, providing a potential link to DCM.