Prenatal-Onset Spinal Muscular Atrophy with Congenital Bone Fractures, also known as smabf, is related to spinal muscular atrophy and muscular atrophy. An important gene associated with Prenatal-Onset Spinal Muscular Atrophy with Congenital Bone Fractures is ASCC1 (Activating Signal Cointegrator 1 Complex Subunit 1). Affiliated tissues include bone and heart.