TY - JOUR
T1 - Intracellular calcium leak as a therapeutic target for RYR1-related myopathies
AU - Kushnir, Alexander
AU - Todd, Joshua J.
AU - Witherspoon, Jessica W.
AU - Yuan, Qi
AU - Reiken, Steven
AU - Lin, Harvey
AU - Munce, Ross H.
AU - Wajsberg, Benjamin
AU - Melville, Zephan
AU - Clarke, Oliver B.
AU - Wedderburn-Pugh, Kaylee
AU - Wronska, Anetta
AU - Razaqyar, Muslima S.
AU - Chrismer, Irene C.
AU - Shelton, Monique O.
AU - Mankodi, Ami
AU - Grunseich, Christopher
AU - Tarnopolsky, Mark A.
AU - Tanji, Kurenai
AU - Hirano, Michio
AU - Riazi, Sheila
AU - Kraeva, Natalia
AU - Voermans, Nicol C.
AU - Gruber, Angela
AU - Allen, Carolyn
AU - Meilleur, Katherine G.
AU - Marks, Andrew R.
N1 - Funding Information:
This work was supported by an RYR1 Foundation Research Grant to AK and by the National Institutes of Health, National Institute of Nursing Research, and Division of Intramural Research. The authors acknowledge the National Disease Research Interchange (NDRI) for supplying control skeletal muscle tissue. This work was also supported by grants from the NIH to ARM (T32HL120826, R01HL145473, R01DK118240, R01HL142903, R01HL061503, R01HL140934, R01AR070194, R25NS076445). This was also supported by a grant from the NIH UL1TR001873 to OC and AK.
Publisher Copyright:
© 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - RYR1 encodes the type 1 ryanodine receptor, an intracellular calcium release channel (RyR1) on the skeletal muscle sarcoplasmic reticulum (SR). Pathogenic RYR1 variations can destabilize RyR1 leading to calcium leak causing oxidative overload and myopathy. However, the effect of RyR1 leak has not been established in individuals with RYR1-related myopathies (RYR1-RM), a broad spectrum of rare neuromuscular disorders. We sought to determine whether RYR1-RM affected individuals exhibit pathologic, leaky RyR1 and whether variant location in the channel structure can predict pathogenicity. Skeletal muscle biopsies were obtained from 17 individuals with RYR1-RM. Mutant RyR1 from these individuals exhibited pathologic SR calcium leak and increased activity of calcium-activated proteases. The increased calcium leak and protease activity were normalized by ex-vivo treatment with S107, a RyR stabilizing Rycal molecule. Using the cryo-EM structure of RyR1 and a new dataset of > 2200 suspected RYR1-RM affected individuals we developed a method for assigning pathogenicity probabilities to RYR1 variants based on 3D co-localization of known pathogenic variants. This study provides the rationale for a clinical trial testing Rycals in RYR1-RM affected individuals and introduces a predictive tool for investigating the pathogenicity of RYR1 variants of uncertain significance.
AB - RYR1 encodes the type 1 ryanodine receptor, an intracellular calcium release channel (RyR1) on the skeletal muscle sarcoplasmic reticulum (SR). Pathogenic RYR1 variations can destabilize RyR1 leading to calcium leak causing oxidative overload and myopathy. However, the effect of RyR1 leak has not been established in individuals with RYR1-related myopathies (RYR1-RM), a broad spectrum of rare neuromuscular disorders. We sought to determine whether RYR1-RM affected individuals exhibit pathologic, leaky RyR1 and whether variant location in the channel structure can predict pathogenicity. Skeletal muscle biopsies were obtained from 17 individuals with RYR1-RM. Mutant RyR1 from these individuals exhibited pathologic SR calcium leak and increased activity of calcium-activated proteases. The increased calcium leak and protease activity were normalized by ex-vivo treatment with S107, a RyR stabilizing Rycal molecule. Using the cryo-EM structure of RyR1 and a new dataset of > 2200 suspected RYR1-RM affected individuals we developed a method for assigning pathogenicity probabilities to RYR1 variants based on 3D co-localization of known pathogenic variants. This study provides the rationale for a clinical trial testing Rycals in RYR1-RM affected individuals and introduces a predictive tool for investigating the pathogenicity of RYR1 variants of uncertain significance.
KW - Calcium
KW - Central core disease
KW - Genetics
KW - RyR1-related myopathy
KW - Ryanodine receptor
KW - Therapeutics
UR - http://www.scopus.com/inward/record.url?scp=85083091085&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85083091085&partnerID=8YFLogxK
U2 - 10.1007/s00401-020-02150-w
DO - 10.1007/s00401-020-02150-w
M3 - Article
C2 - 32236737
AN - SCOPUS:85083091085
SN - 0001-6322
VL - 139
SP - 1089
EP - 1104
JO - Acta neuropathologica
JF - Acta neuropathologica
IS - 6
ER -