ACTA1 and nemaline myopathy: Mutations in ten different genes cause nemaline myopathy: skeletal muscle α-actin (ACTA1) [31], nebulin (NEB) [40], α-tropomyosin [24], β-tropomyosin [9], troponin T1 [22], cofilin 2 (CFL2) [1], KBTBD13 [45], KLHL40 [43], KLHL41 [13] and leiomodin 3 (LMOD3) [58].