TRAPPC6B encodes trafficking protein particle complex subunit 6B (TRAPP complex subunit 6B), which is a component of transport protein particle (TRAPP) complex. TRAPP complex subunit 6B is involved in vesicle-mediated transport as well as differentiation and development of the nervous system. Mutations in TRAPPC6B are associated with neurodevelopmental disorder with microcephaly, epilepsy, and brain atrophy (NEDMEBA).