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JP‐45/ JSRP 1 Variants Affect Skeletal Muscle Excitation–Contraction Coupling by Decreasing the Sensitivity of the Dihydropyridine Receptor
Author(s) -
Yasuda Toshimichi,
Delbono Osvaldo,
Wang ZhongMin,
Messi Maria L.,
Girard Thierry,
Urwyler Albert,
Treves Susan,
Zorzato Francesco
Publication year - 2013
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/humu.22209
Subject(s) - excitation–contraction coupling , biology , skeletal muscle , affect (linguistics) , dihydropyridine , muscle contraction , ryanodine receptor , contraction (grammar) , coupling (piping) , receptor , biophysics , endocrinology , medicine , calcium , genetics , communication , mechanical engineering , sociology , engineering
JP ‐45 (also JP 45; encoded by JSRP 1 ) is an integral protein constituent of the skeletal muscle sarcoplasmic reticulum junctional face membrane interacting with C a v 1.1 (the α.1 subunit of the voltage‐sensing dihydropyridine receptor, DHPR ) and the luminal calcium‐binding protein calsequestrin. Two JSRP 1 variants have been found in the human population: c.323C>T (p.P108L) in exon 5 and c.449G>C (p.G150A) in exon 6, but nothing is known concerning the incidence of these polymorphisms in the general population or in patients with neuromuscular diseases nor the impact of the polymorphisms on excitation–contraction ( EC ) coupling. In the present report, we investigated the frequencies of these two JSRP 1 polymorphisms in the Swiss malignant hyperthermia population and studied the functional impact of the variants on EC coupling. Our results show that the polymorphisms are equally distributed among malignant hyperthermia negative, malignant hyperthermia equivocal, and malignant hyperthermia susceptible individuals. Interestingly, however, the presence of either one of these JP ‐45 variants decreased the sensitivity of the DHPR to activation. The presence of a JSRP 1 variant may explain the variable phenotype seen in patients with malignant hyperthermia carrying the same mutation and, more importantly, may counteract the hypersensitivity of EC coupling caused by mutations in the RYR 1 gene.