Collapsin response mediator protein-3/unc-33-like protein-4 gene: organization, chromosomal mapping and expression in the developing mouse brain

CRMPs (collapsin response mediator proteins)/ULIPs (unc-33-like proteins) a re a family of intracytoplasmic proteins that are expressed mainly in the b rain. The involvement of CRMP/ULIP members in neuronal differentiation, gro wth cone motility and axonal collapse has been suggested. We recently found that a member of this family, CRMP3/ULIP4, corresponds to POP66 (paraneopl astic oligodendrocyte protein of 66 kDa), a protein which may be associated with auto-immune induced-neuronal degeneration in paraneoplastic neurologi cal syndromes. However, the physiological functions of these proteins remai n to be elucidated. Further studies, including the generation of cell lines and of animals with modified/disrupted CRMP/ULIP gene expression, are nece ssary to explore the functions of this protein. We have cloned and determin ed the organization and chromosomal localization of the mouse gene encoding CRMP3/ULIP4. The gene is composed of 14 exons and spans more than 20 kb. W e assigned the mouse CRMP3/ULIP4 gene to the distal end of chromosome 7. In mouse brain, in situ hybridization showed that CRMP3/ULIP4 mRNA is express ed mainly in the dentate gyrus of hippocampus, in the granular layers of ce rebellum and in the inferior olive of the pens, the nucleus which controls movement and posture, and adjusts the major output of descending motor syst em. (C) 2000 Elsevier Science B.V. All rights reserved.