Nemaline myopathy is a neuromuscular condition characterised by muscle weakness, low muscle tone and the finding of nemaline bodies or rods on muscle biopsy. This study encompasses a natural history study of nemaline myopathy, genetic diagnosis and gene discovery using new methods of genetic testing, characterisation of a new disease gene for this condition, and reviewing patient experience with tyrosine, a medication commonly used in patients with nemaline myopathy.