2017
DOI: 10.1590/0004-282x20160171
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Muscle biopsy with dystrophic pattern and rimmed vacuoles: GNE myopathy in a Brazilian patient

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“…The variation in fiber size and the presence of disorganized intermyofibrillar networks in the abnormal fiber regions in our patient, who also harbored a different mutation in the epimerase domain, indicate that these mutations may cause structural and functional changes in the muscle fibers. [ 12 ] The presence of rimmed vacuoles and dystrophic fibers in our patient is consistent with the observations in other patients with GNE myopathy and in Gne(-/-)hGNED176VTg mice, indicating that these mutations lead to a decrease in sialic acid production and protein misfolding, which leads to a reduction in the efficiency of both the ubiquitin-proteasome system and autophagy system to degrade protein aggregates. [ 13 – 16 ] All of these events ultimately cause muscle weakness.…”
Section: Discussionsupporting
confidence: 90%
“…The variation in fiber size and the presence of disorganized intermyofibrillar networks in the abnormal fiber regions in our patient, who also harbored a different mutation in the epimerase domain, indicate that these mutations may cause structural and functional changes in the muscle fibers. [ 12 ] The presence of rimmed vacuoles and dystrophic fibers in our patient is consistent with the observations in other patients with GNE myopathy and in Gne(-/-)hGNED176VTg mice, indicating that these mutations lead to a decrease in sialic acid production and protein misfolding, which leads to a reduction in the efficiency of both the ubiquitin-proteasome system and autophagy system to degrade protein aggregates. [ 13 – 16 ] All of these events ultimately cause muscle weakness.…”
Section: Discussionsupporting
confidence: 90%
“…Descrita inicialmente por Nonaka et al (1981), de quem leva o seu nome, e chamada posteriormente de miopatia com corpos de inclusão hereditária, e mais recentemente de miopatia por GNE, ela se caracteriza por início no adulto jovem, com fraqueza predominante nos músculos tibiais anteriores e presença de vacúolos marginados na histologia, sem inflamação. Embora inicialmente identificados em populações japonesas e do Oriente Médio, pacientes com miopatia associada a variantes bialélicas no gene GNE já foram relatados em todo o mundo, incluindo no Brasil (Estephan et al, 2017).…”
Section: Miopatia Por Gne (Miopatia De Nonaka)unclassified