This family of proteins the superfamily of PHD-finger proteins. At least one example, from mouse, may act as a chromatin-associated protein[1]. The S. pombe ini1 gene is essential, required for splicing [2]. It is localised in the nucleus, but not detected in the nucleolus and can be complemented by human ini1 [2].

1: Identification and characterization of a novel murine multigene family containing a PHD-finger-like motif. Trappe R, Ahmed M, Glaser B, Vogel C, Tascou S, Burfeind P, Engel W; Biochem Biophys Res Commun 2002;293:816-826. PMID:12054543

2: A novel RING-finger-like protein Ini1 is essential for cell cycle progression in fission yeast. Oltra E, Verde F, Werner R, D'Urso G; J Cell Sci 2004;117:967-974. PMID:14762117