Abstract:
:Centronuclear myopathies (CNM) are a subtype of congenital myopathies (CM) characterized by skeletal muscle weakness and an increase in the number of central myonuclei. We have previously identified three CNM probands, two with associated dilated cardiomyopathy, carrying striated preferentially expressed gene (SPEG) mutations. Currently, the role of SPEG in skeletal muscle function is unclear as constitutive SPEG-deficient mice developed severe dilated cardiomyopathy and died in utero. We have generated a conditional Speg-KO mouse model and excised Speg by crosses with striated muscle-specific cre-expressing mice (MCK-Cre). The resulting litters had a delay in Speg excision consistent with cre expression starting in early postnatal life and, therefore, an extended lifespan up to a few months. KO mice were significantly smaller and weaker than their littermate-matched controls. Histopathological skeletal muscle analysis revealed smaller myofibers, marked fiber-size variability, and poor integrity and low number of triads. Further, SPEG-deficient muscle fibers were weaker by physiological and in vitro studies and exhibited abnormal Ca2+ handling and excitation-contraction (E-C) coupling. Overall, SPEG deficiency in skeletal muscle is associated with fewer and abnormal triads, and defective calcium handling and excitation-contraction coupling, suggesting that therapies targeting calcium signaling may be beneficial in such patients.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Huntoon V,Widrick JJ,Sanchez C,Rosen SM,Kutchukian C,Cao S,Pierson CR,Liu X,Perrella MA,Beggs AH,Jacquemond V,Agrawal PBdoi
10.1093/hmg/ddy068subject
Has Abstractpub_date
2018-05-01 00:00:00pages
1608-1617issue
9eissn
0964-6906issn
1460-2083pii
4892302journal_volume
27pub_type
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