ACTG2 and megacystis-microcolon-intestinal hypoperistalsis syndrome 1: This is supported by the recent identification of a recessive mutation in a premature stop codon of LMOD1 as a cause of a rare congenital visceral myopathy, MMIHS[18], which usually arises due to autosomal dominant mutations in the smooth muscle enriched actin gamma 2 (ACTG2) gene.