title: Functions of a jumonji-cyclin D1 pathway in the coordination of cell cycle exit and migration during neurogenesis in the mouse hindbrain.
abstract: During development of the mouse central nervous system (CNS), most neural progenitor cells proliferate in the ventricular zone (VZ). In many regions of the CNS, neural progenitor cells give rise to postmitotic neurons that initiate neuronal differentiation and migrate out of the VZ to the mantle zone (MZ). Thereafter, they remain in a quiescent state. Here, we found many ectopic mitotic cells and cell clusters expressing neural progenitor or proneural marker genes in the MZ of the hindbrain of jumonji (jmj) mutant embryos. When we examined the expression of cyclin D1, which is repressed by jmj in the repression of cardiac myocyte proliferation, we found many ectopic clusters expressing both cyclin D1 and Musashi 1 in the MZ of mutant embryos. jmj is mainly expressed in the cyclin D1 negative region in the hindbrain, and cyclin D1 expression in the VZ was upregulated in jmj mutant mice. In jmj and cyclin D1 double mutant mice, the ectopic mitosis and formation of the abnormal clusters in the MZ were rescued. These results suggest that a jmj-cyclin D1 pathway is required for the precise coordination of cell cycle exit and migration during neurogenesis in the mouse hindbrain.
authors.affiliation: Mitsubishi Kagaku Institute of Life Sciences, 11 Minamiooya, Machida, Tokyo 194-8511, Japan.
authors.forename: Miho
authors.initials: M
authors.lastname: Takahashi
authors.forename: Mizuyo
authors.initials: M
authors.lastname: Kojima
authors.forename: Kuniko
authors.initials: K
authors.lastname: Nakajima
authors.forename: Rika
authors.initials: R
authors.lastname: Suzuki-Migishima
authors.forename: Takashi
authors.initials: T
authors.lastname: Takeuchi
mesh_terms: D000818:Animals; D002453:Cell Cycle / Q000235:genetics / Q000502:physiology; D002454:Cell Differentiation / Q000235:genetics / Q000502:physiology; D002465:Cell Movement / Q000235:genetics / Q000502:physiology; D056741:Cyclin D; D016213:Cyclins / Q000235:genetics / Q000378:metabolism*; D005260:Female; D018507:Gene Expression Regulation, Developmental; D051379:Mice; D008809:Mice, Inbred C3H; D008817:Mice, Mutant Strains; D008938:Mitosis / Q000235:genetics / Q000502:physiology; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D063151:Polycomb Repressive Complex 2; D011247:Pregnancy; D011401:Promoter Regions, Genetic; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D012249:Rhombencephalon / Q000166:cytology / Q000196:embryology* / Q000378:metabolism*
chemical_list: D056741:Cyclin D; D016213:Cyclins; C093650:Jarid2 protein, mouse; C104786:Msi1h protein, mouse; D009419:Nerve Tissue Proteins; D016601:RNA-Binding Proteins; D063151:Polycomb Repressive Complex 2