This domain is found in the neurobeachins (NBEAs) and BEACH domain containing proteins (BDCPs). NBEAS are localised near Golgi apparatus and is involved in vesicular trafficking, intracellular transport, membrane dynamics, endosomal recycling, and receptor signalling. BDCPs are associated with lysosome size, apoptosis, autophagy, granule size, or synapse formation. Mutations in this domain have been related to autosomal recessively inherited lipopolysaccharide-responsive beige-like anchor (LRBA) protein deficiency, responsible for common variable immunodeficiency (CVID) and autoimmune lymphoproliferative syndrome (ALPS) [1]. NBEAs deficiency may induce spine loss with defects in synaptic efficacy and plasticity, being associated with autism spectrum disorder (ASD) and ASD-related syndromes [2].

1: A Spectrum of Clinical Findings from ALPS to CVID: Several Novel LRBA Defects. Cagdas D, Halacli SO, Tan C, Lo B, Cetinkaya PG, Esenboga S, Karaatmaca B, Matthews H, Balci-Hayta B, Arikoglu T, Ezgu F, Aladag E, Saltik-Temizel IN, Demir H, Kuskonmaz B, Okur V, Gumruk F, Goker H, Cetinkaya D, Boztug K, Lenardo M, Sanal O, Tezcan I; J Clin Immunol. 2019;39:726-738. PMID:31432443

2: Autism Spectrum Disorder-Related Syndromes: Modeling with Drosophila and Rodents. Ueoka I, Pham HTN, Matsumoto K, Yamaguchi M; Int J Mol Sci. 2019; [Epub ahead of print] PMID:31438473