This family consists of several eukaryotic Surfeit locus protein 5 (SURF5) sequences. The human Surfeit locus has been mapped on chromosome 9q34.1. The locus includes six tightly clustered housekeeping genes (Surf1-6), and the gene organisation is similar in human, mouse and chicken Surfeit locus. The Med22 subunit of Mediator complex is part of the essential core head region [2] [3].

1: The human homologue of the mouse Surf5 gene encodes multiple alternatively spliced transcripts. Angiolillo A, Russo G, Porcellini A, Smaldone S, D'Alessandro F, Pietropaolo C; Gene 2002;284:169-178. PMID:11891058

2: A unified nomenclature for protein subunits of mediator complexes linking transcriptional regulators to RNA polymerase II. Bourbon HM, Aguilera A, Ansari AZ, Asturias FJ, Berk AJ, Bjorklund S, Blackwell TK, Borggrefe T, Carey M, Carlson M, Conaway JW, Conaway RC, Emmons SW, Fondell JD, Freedman LP, Fukasawa T, Gustafsson CM, Han M, He X, Herman PK, Hinnebusch AG, Holmberg S, Mol Cell. 2004;14:553-557. PMID:15175151

3: Structure-system correlation identifies a gene regulatory Mediator submodule. Lariviere L, Seizl M, van Wageningen S, Rother S, van de Pasch L, Feldmann H, Strasser K, Hahn S, Holstege FC, Cramer P; Genes Dev. 2008;22:872-877. PMID:18381891