OSORIO LOPES ABATH NETO
Projetos de Pesquisa
Unidades Organizacionais
Instituto Central, Hospital das Clínicas, Faculdade de Medicina - Médico
LIM/45 - Laboratório de Fisiopatologia Neurocirúrgica, Hospital das Clínicas, Faculdade de Medicina
LIM/45 - Laboratório de Fisiopatologia Neurocirúrgica, Hospital das Clínicas, Faculdade de Medicina
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- STAC3 variants cause a congenital myopathy with distinctive dysmorphic features and malignant hyperthermia susceptibility(2018) ZAHARIEVA, Irina T.; SARKOZY, Anna; MUNOT, Pinki; MANZUR, Adnan; O'GRADY, Gina; RENDU, John; MALFATTI, Eduardo; AMTHOR, Helge; SERVAIS, Laurent; URTIZBEREA, J. Andoni; ABATH NETO, Osorio; ZANOTELI, Edmar; DONKERVOORT, Sandra; TAYLOR, Juliet; DIXON, Joanne; POKE, Gemma; FOLEY, A. Reghan; HOLMES, Chris; WILLIAMS, Glyn; HOLDER, Muriel; YUM, Sabrina; MEDNE, Livija; QUIJANO-ROY, Susana; ROMERO, Norma B.; FAURE, Julien; FENG, Lucy; BASTAKI, Laila; DAVIS, Mark R.; PHADKE, Rahul; SEWRY, Caroline A.; BONNEMANN, Carsten G.; JUNGBLUTH, Heinz; BACHMANN, Christoph; TREVES, Susan; MUNTONI, FrancescoSH3 and cysteine-rich domain-containing protein 3 (STAC3) is an essential component of the skeletal muscle excitation-contraction coupling (ECC) machinery, though its role and function are not yet completely understood. Here, we report 18 patients carrying a homozygous p.(Trp284Ser) STAC3 variant in addition to a patient compound heterozygous for the p.(Trp284Ser) and a novel splice site change (c.997-1G > T). Clinical severity ranged from prenatal onset with severe features at birth, to a milder and slowly progressive congenital myopathy phenotype. A malignant hyperthermia (MH)-like reaction had occurred in several patients. The functional analysis demonstrated impaired ECC. In particular, KCl-induced membrane depolarization resulted in significantly reduced sarcoplasmic reticulum Ca2+ release. Co-immunoprecipitation of STAC3 with Ca(V)1.1 in patients and control muscle samples showed that the protein interaction between STAC3 and Ca(V)1.1 was not significantly affected by the STAC3 variants. This study demonstrates that STAC3 gene analysis should be included in the diagnostic work up of patients of any ethnicity presenting with congenital myopathy, in particular if a history of MH-like episodes is reported. While the precise pathomechanism remains to be elucidated, our functional characterization of STAC3 variants revealed that defective ECC is not a result of Ca(V)1.1 sarcolemma mislocalization or impaired STAC3-Ca(V)1.1 interaction.