This family consists of AF4 (Proto-oncogene AF4) and FMR2 (Fragile X syndrome) nuclear proteins. These proteins have been linked to human diseases such as acute lymphoblastic leukaemia and mental disabilities [1]. The family also contains a Drosophila AF4 protein homologue Lilliputian which contains an AT-hook domain. Lilliputian represents a novel pair-rule gene that acts in cytoskeleton regulation, segmentation and morphogenesis in Drosophila [2].

1: Lilliputian: an AF4/FMR2-related protein that controls cell identity and cell growth. Wittwer F, van der Straten A, Keleman K, Dickson BJ, Hafen E; Development 2001;128:791-800. PMID:11171403

2: Transcriptional regulation of cytoskeletal functions and segmentation by a novel maternal pair-rule gene, lilliputian. Tang AH, Neufeld TP, Rubin GM, Muller HA; Development 2001;128:801-813. PMID:11171404