| A rare mitochondrial oxidative phosphorylation disorder with characteristics of variable combination of psychomotor delay, hypotonia, muscle weakness, seizures, microcephaly, cardiomyopathy and mild dysmorphic facial features. Variable types of structural brain anomalies have also been reported. Biochemical studies typically show decreased activity of mitochondrial complexes (mainly complex I). Caused by homozygous or compound heterozygous mutation in the VARS2 gene on chromosome 6p21. |
