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Fujimoto HM, Fujimoto M, Sugiura T, Nakane S, Wakano Y, Sato E, Oshita H, Togawa Y, Sugimoto M, Kato T, Yasuda K, Muramatsu K, Saitoh S. Novel SPEG variants in a neonate with severe dilated cardiomyopathy and relatively mild hypotonia. Hum Genome Var 2023; 10:24. [PMID: 37673875 PMCID: PMC10482934 DOI: 10.1038/s41439-023-00253-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 08/15/2023] [Accepted: 08/23/2023] [Indexed: 09/08/2023] Open
Abstract
Striated muscle preferentially expressed protein kinase (SPEG) variants have been reported to cause centronuclear myopathy associated with cardiac diseases. The severity of skeletal muscle symptoms and cardiac symptoms are presumably related to the location of the variant. Here, we report novel SPEG compound heterozygous pathological variants in a neonate with severe dilated cardiomyopathy and relatively mild hypotonia. This report expands the genotype-phenotype correlations of patients with SPEG variants.
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Affiliation(s)
| | - Masanori Fujimoto
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Takahiro Sugiura
- Department of Pediatrics, Toyohashi Municipal Hospital, Toyohashi, Aichi, Japan
| | - Shigeharu Nakane
- Department of Pediatrics, Toyohashi Municipal Hospital, Toyohashi, Aichi, Japan
| | - Yasuhiro Wakano
- Department of Pediatrics, Toyohashi Municipal Hospital, Toyohashi, Aichi, Japan
| | - Emi Sato
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Hironori Oshita
- Department of Pediatrics, Toyohashi Municipal Hospital, Toyohashi, Aichi, Japan
| | - Yasuko Togawa
- Department of Pediatrics, Toyohashi Municipal Hospital, Toyohashi, Aichi, Japan
| | - Mari Sugimoto
- Department of Pediatrics, Toyohashi Municipal Hospital, Toyohashi, Aichi, Japan
| | - Takenori Kato
- Department of Pediatrics, Toyohashi Municipal Hospital, Toyohashi, Aichi, Japan
| | - Kazushi Yasuda
- Department of Cardiology, Aichi Children's Health and Medical Center, Obu, Aichi, Japan
| | - Kanji Muramatsu
- Department of Pediatrics, Toyohashi Municipal Hospital, Toyohashi, Aichi, Japan
| | - Shinji Saitoh
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan.
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Rossi D, Catallo MR, Pierantozzi E, Sorrentino V. Mutations in proteins involved in E-C coupling and SOCE and congenital myopathies. J Gen Physiol 2022; 154:e202213115. [PMID: 35980353 PMCID: PMC9391951 DOI: 10.1085/jgp.202213115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 07/15/2022] [Accepted: 07/21/2022] [Indexed: 11/24/2022] Open
Abstract
In skeletal muscle, Ca2+ necessary for muscle contraction is stored and released from the sarcoplasmic reticulum (SR), a specialized form of endoplasmic reticulum through the mechanism known as excitation-contraction (E-C) coupling. Following activation of skeletal muscle contraction by the E-C coupling mechanism, replenishment of intracellular stores requires reuptake of cytosolic Ca2+ into the SR by the activity of SR Ca2+-ATPases, but also Ca2+ entry from the extracellular space, through a mechanism called store-operated calcium entry (SOCE). The fine orchestration of these processes requires several proteins, including Ca2+ channels, Ca2+ sensors, and Ca2+ buffers, as well as the active involvement of mitochondria. Mutations in genes coding for proteins participating in E-C coupling and SOCE are causative of several myopathies characterized by a wide spectrum of clinical phenotypes, a variety of histological features, and alterations in intracellular Ca2+ balance. This review summarizes current knowledge on these myopathies and discusses available knowledge on the pathogenic mechanisms of disease.
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Affiliation(s)
- Daniela Rossi
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy
- Interdepartmental Program of Molecular Diagnosis and Pathogenetic Mechanisms of Rare Genetic Diseases, Azienda Ospedaliero Universitaria Senese, Siena, Italy
| | - Maria Rosaria Catallo
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy
| | - Enrico Pierantozzi
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy
| | - Vincenzo Sorrentino
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy
- Interdepartmental Program of Molecular Diagnosis and Pathogenetic Mechanisms of Rare Genetic Diseases, Azienda Ospedaliero Universitaria Senese, Siena, Italy
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