ScienceDaily (Apr. 15, 2008) — Some kids with autism may have a genetic defect that affects the muscles, according to new research. The study looked at 37 children with autism spectrum disorders who were evaluated for mitochondrial disease, which causes muscle weakness and prevents a child from being able to participate in physical activities and sports. Mitochondrial disease occurs when genetic mutations affect the mitochondria, or the part of the cell that releases energy.
