Homozygous recessive MYH2 mutation mimicking dominant MYH2 associated myopathy.
Homozygous recessive MYH2 mutation mimicking dominant MYH2 associated myopathy.
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DOI:
10.1016/j.nmd.2018.05.006
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发表时间:
2018-08
期刊:
影响因子:
--
通讯作者:
Weihl CC
中科院分区:
文献类型:
--
作者:
Findlay AR;Harms MB;Pestronk A;Weihl CC
Mutations in MYH2 that encodes myosin heavy chain IIa cause both dominant and recessively inherited myopathies. Patients with dominantly inherited MYH2 missense mutations present with ophthalmoplegia and progressive proximal limb weakness. Muscle biopsy reveals rimmed vacuoles and inclusions, prompting this entity to initially be described as hereditary inclusion body myopathy 3. In contrast, patients with recessive MYH2 mutations have early onset, non-progressive, diffuse weakness and ophthalmoplegia. Muscle biopsy reveals near or complete absence of type 2A fibers with no vacuole or inclusion pathology. We describe a patient with childhood onset ophthalmoplegia, progressive proximal muscle weakness beginning in adolescence, and muscle biopsy with myopathic changes and rimmed vacuoles. Although this patient’s disease course and histopathology is consistent with dominant MYH2 mutations, whole exome sequencing revealed a c.737 G>A p.Arg246Thr homozygous MYH2 variant. These findings expand the clinical and pathologic phenotype of recessive MYH2 myopathies.
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DOI:
10.1073/pnas.250289597
发表时间:
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影响因子:
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通讯作者:
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