Laing distal myopathy
is a slowly progressive muscle disorder that tends to begin in childhood. Early symptoms include weakness in the feet and ankles, followed by weakness in the hands and wrists. Weakness in the feet leads to tightening of the Achilles tendon, an inability to lift the big toe, and a high-stepping walk. Weakness in the hands makes it more difficult to lift the fingers, especially the third and fourth fingers. As the muscle weakness slowly progresses over the course of many years, other muscles of the body (e.g., neck, face, legs, hips, and shoulders) weaken. Most affected people remain mobile throughout life. Life expectancy is normal. Laing distal myopathy is caused by mutations in the MYH7 gene and is inherited in an autosomal dominant fashion. Source: Genetic and Rare Diseases Information Center (GARD), supported by ORDR-NCATS and NHGRI.