Diaphanous Protein Interacting Protein (DIP1)

DIP1 is localized exclusively in the cell nucleus. It plays a role in signal transduction, and may function in the maintenance of sarcomeres and in the assembly of myofibrils into sarcomeres. It also plays an important role in stress fiber formation. The gene is involved in therapy-related leukemia by a chromosomal translocation t(3;11)(p21;q23) that involves this gene and the myeloid/lymphoid leukemia gene. Alternative splicing occurs in this locus and two transcript variants encoding distinct isoforms have been identified.

AF3p21 encodes a nuclear protein consisting of 722 amino acids with an SH3 domain, a proline-rich domain, and a bipartite nuclear localization signal. The protein's SH3 domain has high homology with that of FYN .