Muscle Phenotypic Variability in Limb Girdle Muscular Dystrophy 2 G

作者：Paim Julia F; Cotta Ana; Vargas Antonio P; Navarro Monica M; Valicek Jaquelin; Carvalho Elmano; da Cunha Junior Antonio L; Plentz Estevao; Braz Shelida V; Takata Reinaldo I; Almeida Camila F; Vainzof Mariz^*

来源：Journal of Molecular Neuroscience, 2013, 50(2): 339-344.

DOI：10.1007/s12031-013-9987-6

• Limb girdle muscular dystrophy
• Telethonin
• LGMD2G
• Nemaline rods
• Paracrystalline inclusions

Limb girdle muscular dystrophy type 2 G (LGMD2G) is caused by mutations in the telethonin gene. Only few families were described presenting this disease, and they are mainly Brazilians. Here, we identified one additional case carrying the same common c.157C > T mutation in the telethonin gene but with an atypical histopathological muscle pattern. In a female patient with a long duration of symptoms (46 years), muscle biopsy showed, in addition to telethonin deficiency, the presence of nemaline rods, type 1 fiber predominance, nuclear internalization, lobulated fibers, and mitochondrial paracrystalline inclusions. Her first clinical signs were identified at 8 years old, which include tiptoe walking, left lower limb deformity, and frequent falls. Ambulation loss occurred at 41 years old, and now, at 54 years old, she presented pelvic girdle atrophy, winging scapula, foot deformity with incapacity to perform ankle dorsiflexion, and absent tendon reflexes. The presence of nemaline bodies could be a secondary phenomenon, possibly associated with focal Z-line abnormalities of a long-standing disease. However, these new histopathological findings, characteristic of congenital myopathies, expand muscle phenotypic variability of telethoninopathy.

• 出版日期2013-6