| A rare hereditary non-dystrophic myopathy with characteristics of proximal muscle weakness, delayed motor development, learning difficulties, and progressive extrapyramidal motor signs including chorea, dystonia and tremor. Variable additional features have been reported and include ataxia, microcephaly, ophthalmoplegia, ptosis, and optic atrophy. There is evidence the disease is caused by homozygous mutation in the MICU1 gene on chromosome 10q22. |
