Multifunctional RNA binding protein that plays a role in RNA metabolism and DNA maintenance. Participates in the resolution of DNA stress and the maintenance of genome integrity by localizing to sites of DNA insults (PubMed:29069457). Also plays a role in proper nucleolar organization by limiting nucleolar size and regulating nucleolar number. Mechanistically, regulates the nucleolar levels of fibrillarin and nucleolin, two key players in pre-rRNA processing and ribosome assembly (PubMed:30988155). {ECO:0000269|PubMed:29069457, ECO:0000269|PubMed:30988155}. This is the function of ENSG00000273899 (NOL12, nucleolar protein 12).