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• W2936383310 abstract "The skeletal muscle ryanodine receptor (RyR1), i.e., the Ca 2+ channel of the sarco/endoplasmic reticulum (S/ER), and the voltage-dependent calcium channel Cav1.1 are the principal channels involved in excitation-contraction coupling in skeletal muscle. RYR1 gene variants are linked to distinct skeletal muscle disorders, including malignant hyperthermia susceptibility and central core disease (CCD), mainly with autosomal dominant inheritance, and autosomal recessive myopathies with a broad phenotypic and histopathological spectrum. The age at onset of RYR1 -related myopathies varies from infancy to adulthood. We report the identification of four RYR1 variants in two Italian families: one with myopathy and variants c.4003C>T (p.R1335C) and c.7035C>A (p.S2345R), and another with CCD and variants c.9293G>T (p.S3098I) and c.14771_14772insTAGACAGGGTGTTGCTCTGTTGCCCTTCTT (p.F4924_V4925insRQGVALLPFF). We demonstrate that, in patient-specific lymphoblastoid cells, the c.4003C>T (p.R1335C) variant is not expressed and the in-frame 30-nucleotide insertion variant is expressed at a low level. Moreover, Ca 2+ release in response to the RyR1 agonist 4-chloro-m-cresol and to thapsigargin showed that the c.7035C>A (p.S2345R) variant causes depletion of S/ER Ca 2+ stores and that the compound heterozygosity for variant c.9293G>T (p.S3098I) and the 30-nucleotide insertion increases RyR1-dependent Ca 2+ release without affecting ER Ca 2+ stores. In conclusion, we detected and functionally characterized disease-causing variants of the RyR1 channel in patient-specific lymphoblastoid cells." @default.
• W2936383310 created "2019-04-25" @default.
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• W2936383310 date "2019-04-21" @default.
• W2936383310 modified "2023-09-27" @default.
• W2936383310 title "<i>RYR1</i>Sequence Variants in Myopathies: Expression and Functional Studies in Two Families" @default.
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• W2936383310 doi "https://doi.org/10.1155/2019/7638946" @default.
• W2936383310 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6500691" @default.
• W2936383310 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31165076" @default.
• W2936383310 hasPublicationYear "2019" @default.
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