Abstract:
:Tubular aggregates are regular arrays of membrane tubules accumulating in muscle with age. They are found as secondary features in several muscle disorders, including alcohol- and drug-induced myopathies, exercise-induced cramps, and inherited myasthenia, but also exist as a pure genetic form characterized by slowly progressive muscle weakness. We identified dominant STIM1 mutations as a genetic cause of tubular-aggregate myopathy (TAM). Stromal interaction molecule 1 (STIM1) is the main Ca(2+) sensor in the endoplasmic reticulum, and all mutations were found in the highly conserved intraluminal Ca(2+)-binding EF hands. Ca(2+) stores are refilled through a process called store-operated Ca(2+) entry (SOCE). Upon Ca(2+)-store depletion, wild-type STIM1 oligomerizes and thereby triggers extracellular Ca(2+) entry. In contrast, the missense mutations found in our four TAM-affected families induced constitutive STIM1 clustering, indicating that Ca(2+) sensing was impaired. By monitoring the calcium response of TAM myoblasts to SOCE, we found a significantly higher basal Ca(2+) level in TAM cells and a dysregulation of intracellular Ca(2+) homeostasis. Because recessive STIM1 loss-of-function mutations were associated with immunodeficiency, we conclude that the tissue-specific impact of STIM1 loss or constitutive activation is different and that a tight regulation of STIM1-dependent SOCE is fundamental for normal skeletal-muscle structure and function.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Böhm J,Chevessier F,Maues De Paula A,Koch C,Attarian S,Feger C,Hantaï D,Laforêt P,Ghorab K,Vallat JM,Fardeau M,Figarella-Branger D,Pouget J,Romero NB,Koch M,Ebel C,Levy N,Krahn M,Eymard B,Bartoli M,Laporte Jdoi
10.1016/j.ajhg.2012.12.007subject
Has Abstractpub_date
2013-02-07 00:00:00pages
271-8issue
2eissn
0002-9297issn
1537-6605pii
S0002-9297(12)00641-6journal_volume
92pub_type
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