LAUSR

Although splicing is an integral part of the expression of many genes in our body, genetic syndromes with spliceosomal defects affect only specific tissues. To help understand the mechanism, we investigated the expression pattern of a core protein of the major spliceosome, SmB/B′ (Small Nuclear Ribonucleoprotein Polypeptides B/B′), which is encoded by SNRPB. Loss‐of‐function mutations of SNRPB in humans cause cerebro‐costo‐mandibular syndrome (CCMS) characterized by rib gaps, micrognathia, cleft palate, and scoliosis. Our expression analysis focused on the affected structures as well as non‐affected tissues, using chick and mouse embryos as model animals.