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Recessive mutations in RYR1 are a common cause of congenital fiber type disproportion.: Recessive Mutations in RYR1 Cause CFTD

Abstract : The main histological abnormality in congenital fiber type disproportion (CFTD) is hypotrophy of type 1 (slow twitch) fibers compared to type 2 (fast twitch) fibers. To investigate whether mutations in RYR1 are a cause of CFTD we sequenced RYR1 in seven CFTD families in whom the other known causes of CFTD had been excluded. We identified compound heterozygous changes in the RYR1 gene in four families (five patients), consistent with autosomal recessive inheritance. Three out of five patients had ophthalmoplegia, which may be the most specific clinical indication of mutations in RYR1. Type 1 fibers were at least 50% smaller, on average, than type 2 fibers in all biopsies. Recessive mutations in RYR1 are a relatively common cause of CFTD and can be associated with extreme fiber size disproportion.
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https://www.hal.inserm.fr/inserm-00588144
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Submitted on : Wednesday, July 13, 2011 - 1:20:46 PM
Last modification on : Saturday, May 30, 2020 - 12:28:04 AM
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Nigel Clarke, Leigh Waddell, Sandra Cooper, Margaret Perry, Robert Smith, et al.. Recessive mutations in RYR1 are a common cause of congenital fiber type disproportion.: Recessive Mutations in RYR1 Cause CFTD. Human Mutation, Wiley, 2010, 31 (7), pp.E1544-50. ⟨10.1002/humu.21278⟩. ⟨inserm-00588144⟩

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