title: Targeted disruption of the neurochondrin/norbin gene results in embryonic lethality.
abstract: Neurochondrin/norbin is a cytoplasmic protein involved in dendrite outgrowth. The expression of the gene has been restricted to neural, bone, and chondral tissues. To identify the functions of the gene in vivo, we have generated mice with a disrupted mutation in the neurochondrin/norbin gene. Histological analysis of heterozygous mutant mice indicates the possibility of specific functions of neurochondrin/norbin in chondrocyte differentiation. We defined the expression patterns of neurochondrin/norbin-lacZ fusion protein in the central nervous system. In the developing olfactory bulb, beta-galactosidase activity was detected in the mantle layer at 12.5 dpc and the strongest activity was detected in the presumptive mitral or tufted cell layer at 15.5 dpc. beta-Galactosidase activity was also detected in the lateral choroid plexus. In homozygous (-/-) mutant mice, the disruption of the neurochondrin/norbin gene leads to early embryonic death between 3.5 and 6.5 dpc. This result indicates that neurochondrin/norbin gene function is essential for the early embryogenesis.
authors.affiliation: Center for Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Reiko
authors.initials: R
authors.lastname: Mochizuki
authors.forename: Minori
authors.initials: M
authors.lastname: Dateki
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Yanai
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Ishizuka
authors.forename: Norio
authors.initials: N
authors.lastname: Amizuka
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kawashima
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Koga
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Ozawa
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Fukamizu
mesh_terms: D000818:Animals; D001483:Base Sequence; D002454:Cell Differentiation; D019902:Chondrocytes / Q000166:cytology; D017931:DNA Primers; D005260:Female; D005804:Genes, Lethal; D006579:Heterozygote; D006720:Homozygote; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008817:Mice, Mutant Strains; D009419:Nerve Tissue Proteins / Q000235:genetics*; D009479:Neuropeptides / Q000235:genetics*; D009830:Olfactory Bulb / Q000201:enzymology; D001616:beta-Galactosidase / Q000378:metabolism
chemical_list: D017931:DNA Primers; D009419:Nerve Tissue Proteins; D009479:Neuropeptides; C119189:neurochondrin; C109587:norbin; D001616:beta-Galactosidase