Small nuclear ribonucleoprotein Sm D1 (SNRPD1)

Small nuclear ribonucleoprotein Sm D1 is a core protein component of the snRNP complex within the spliceosome that is essential for pre-mRNA splicing and thus for accurate gene expression in all human cells[1][3][4]. SNRPD1 acts as a charged scaffold aiding the assembly and stability of snRNPs through nonspecific contacts with RNA, and is a required part of the U1, U2, U4, and U5 spliceosomal complexes[3][4]. It also plays critical roles in cell cycle regulation, proliferation, and in the establishment of pluripotency in stem cells[4][5]. SNRPD1 is overexpressed in several cancers where its increased expression is linked to tumor progression, poor prognosis (notably in hepatocellular carcinoma), and cell survival, partially via pathways like mTOR and autophagy[4][5]. As an autoantigen, SNRPD1-derived peptides are targets for anti-Sm autoantibodies in systemic lupus erythematosus and are relevant in autoimmune diagnostics[4][5]. Disrupted function or mutation of SNRPD1 is implicated in autoimmune diseases, various cancers, and neurological disorders such as spinal muscular atrophy due to its interaction with the SMN protein[4][5].

Other names

Small nuclear ribonucleoprotein D1 polypeptideSm-D1SMD1SNRPDSm-D autoantigensnRNP core protein D1HsT2456