MYH7
肌病
医学
突变
表型
基因突变
遗传学
肌肉挛缩
病理
基因
生物
解剖
基因亚型
作者
Catherine E Alessi,Qian Wu,Charles H. Whitaker,Kevin J. Felice
出处
期刊:Journal of Clinical Neuromuscular Disease
[Ovid Technologies (Wolters Kluwer)]
日期:2020-09-01
卷期号:22 (1): 22-34
被引量:3
标识
DOI:10.1097/cnd.0000000000000297
摘要
Abstract Laing distal myopathy (LDM) is an autosomal dominant disorder caused by mutations in the slow skeletal muscle fiber myosin heavy chain ( MYH7 ) gene on chromosome 14q11.2. The classic LDM phenotype—including early-onset, initial involvement of foot dorsiflexors and great toe extensors, followed by weakness of neck flexors and finger extensors—is well documented. Since the original report by Laing et al in 1995, the spectrum of MYH7 -related myopathies has expanded to include congenital myopathies, late-onset myopathies, myosin storage myopathy, and scapuloperoneal myopathies. Most patients with LDM harbor mutations in the midrod domain of the MYH7 gene, but rare cases document disease-associated mutations in the globular head region. In this report, we add to the medical literature by describing the clinicopathological findings in 8 affected family members from 4 new LDM families—including 2 with novel MYH7 mutations (Y162D and A1438P), one with dual mutations (V39M and K1617del), and one family (E1508del) with severe early-onset weakness associated with contractures, respiratory insufficiency, and dilated cardiomyopathy. Our families highlight the ever-expanding clinical spectrum and genetic variation of the skeletal myopathies related to MYH7 gene mutations.
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