Role of Clast1 in development of cerebellar granule cells.
We have identified the murine Clast1/LR8 gene by subtraction of cDNA derived from CD40 ligand-activated and naive B cells. The Clast1 gene is ubiquitously expressed in various organs of adult mice. However, its physiological function was largely unknown. To study a role of Clast1, we established Clast1-deficient (Clast1-KO) mice. Here, we reveal that approximately 65% of Clast1-KO mice showed severe ataxia. The Clast1-KO cerebellum with ataxia is small in size and revealed a severely aberrant lobulation, loss of the internal granule cell layer, and the disorganized Purkinje cells. Clast1 mRNA is expressed in the cerebellar granule cells of normal adult mice. Developmentally, Clast1 mRNA is also detected in the external germinal layer of the embryonic cerebellum, indicating its expression in granule cell precursors. Histopathological analysis of the developing Clast1-KO cerebellum demonstrated the reduced number of cells in the external germinal layer. Thus, Clast1 is required for development of cerebellar granule cells.
Maeda
Yukiteru
Y
Department of Developmental Genetics (H2), Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan.
Fujimura
Lisa
L
O-Wang
Jiyang
J
Hatano
Masahiko
M
Sakamoto
Akemi
A
Arima
Masafumi
M
Ebara
Masaaki
M
Ino
Hidetoshi
H
Yamashita
Toshihide
T
Saisho
Hiromitsu
H
Tokuhisa
Takeshi
T
D000818:Animals; D000831:Animals, Newborn; D001259:Ataxia / Q000235:genetics; D015152:Blotting, Northern / Q000379:methods; D015139:Blotting, Southern / Q000379:methods; D002478:Cells, Cultured; D002531:Cerebellum / Q000166:cytology* / Q000254:growth & development*; D003001:Cloning, Molecular; D004622:Embryo, Mammalian; D015870:Gene Expression / Q000502:physiology; D007150:Immunohistochemistry / Q000379:methods; D017403:In Situ Hybridization / Q000379:methods; D008074:Lipoproteins / Q000172:deficiency / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout / Q000235:genetics*; D009474:Neurons / Q000502:physiology*; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods
D008074:Lipoproteins; D012333:RNA, Messenger