Loss-of-function mutations in MICU1 cause a brain and muscle disorder linked to primary alterations in mitochondrial calcium signaling.

Logan, Clare V, Szabadkai, György, Sharpe, Jenny A, Parry, David A, Torelli, Silvia, Childs, Anne-Marie, Kriek, Marjolein, Phadke, Rahul, Johnson, Colin A, Roberts, Nicola Y, Bonthron, David T, Pysden, Karen A, Whyte, Tamieka, Munteanu, Iulia, Foley, A Reghan, Wheway, Gabrielle, Szymanska, Katarzyna, Natarajan, Subaashini, Abdelhamed, Zakia A, Morgan, Joanne E, Roper, Helen, Santen, Gijs W E, Niks, Erik H, van der Pol, W Ludo, Lindhout, Dick, Raffaello, Anna, De Stefani, Diego, den Dunnen, Johan T, Sun, Yu, Ginjaar, Ieke, Sewry, Caroline A, Hurles, Matthew, Rizzuto, Rosario, Duchen, Michael R, Muntoni, Francesco and Sheridan, Eamonn (2014) Loss-of-function mutations in MICU1 cause a brain and muscle disorder linked to primary alterations in mitochondrial calcium signaling. Nature genetics, 46 (2). pp. 188-93. ISSN 1546-1718.

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Official URL: http://www.nature.com/ng/journal/v46/n2/full/ng.28...

Abstract

Mitochondrial Ca(2+) uptake has key roles in cell life and death. Physiological Ca(2+) signaling regulates aerobic metabolism, whereas pathological Ca(2+) overload triggers cell death. Mitochondrial Ca(2+) uptake is mediated by the Ca(2+) uniporter complex in the inner mitochondrial membrane, which comprises MCU, a Ca(2+)-selective ion channel, and its regulator, MICU1. Here we report mutations of MICU1 in individuals with a disease phenotype characterized by proximal myopathy, learning difficulties and a progressive extrapyramidal movement disorder. In fibroblasts from subjects with MICU1 mutations, agonist-induced mitochondrial Ca(2+) uptake at low cytosolic Ca(2+) concentrations was increased, and cytosolic Ca(2+) signals were reduced. Although resting mitochondrial membrane potential was unchanged in MICU1-deficient cells, the mitochondrial network was severely fragmented. Whereas the pathophysiology of muscular dystrophy and the core myopathies involves abnormal mitochondrial Ca(2+) handling, the phenotype associated with MICU1 deficiency is caused by a primary defect in mitochondrial Ca(2+) signaling, demonstrating the crucial role of mitochondrial Ca(2+) uptake in humans.

Item Type: Article
Subjects: QC-QM General sciences
Divisions: Womens and Childrens > Paediatrics
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Depositing User: Users 7 not found.
Date Deposited: 11 Jun 2014 13:41
Last Modified: 11 Jun 2014 13:41
URI: http://www.repository.uhblibrary.co.uk/id/eprint/244

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