Abstract:
:We performed a systematic screen for mutations affecting the trajectory of axons visualized by immunohistochemical staining of Medaka embryos with anti-acetylated tubulin antibody. Among the mutations identified, yanagi (yan) and kazura (kaz) mutations caused specific defects in projection of the posterior lateral line (PLL) nerve. In yan and kaz mutant embryos, the PLL nerve main bundle was misrouted ventrally and dorsally or anteriorly. Medaka semaphorin3A, sdf1, and cxcr4 cDNA fragments were cloned to allow analysis of these mutants. There were no changes in semaphorin3A or sdf1 expression in mutant embryos, suggesting that the tissues expressing semaphorin3A or sdf1 that are involved in PLL nerve guidance are present in these mutant embryos. Double staining revealed that the mislocated PLL primordium and growth cone of the ectopically projected PLL nerve were always colocalized in both yan and kaz mutant embryos, suggesting that migration of PLL primordia and PLL nerve growth cones are not uncoupled in these mutants. Although homozygous yan larvae showed incomplete migration of the PLL primordium along the anteroposterior axis, ventral proneuromast migration was complete, suggesting that ventral migration of the proneuromast does not require the signaling affected in yan mutants. In addition to the PLL system, the distribution of primordial germ cells (PGCs) was also affected in both yan and kaz mutant embryos, indicating that yan and kaz genes are required for the migration of both PLL primordia and PGCs. Genetic linkage analysis indicated that kaz is linked to cxcr4, but yan is not linked to sdf1 or cxcr4. These mutations will provide genetic clues to investigate the molecular mechanism underlying formation of the PLL system.
journal_name
Mech Devjournal_title
Mechanisms of developmentauthors
Yasuoka A,Hirose Y,Yoda H,Aihara Y,Suwa H,Niwa K,Sasado T,Morinaga C,Deguchi T,Henrich T,Iwanami N,Kunimatsu S,Abe K,Kondoh H,Furutani-Seiki Mdoi
10.1016/j.mod.2004.03.032subject
Has Abstractpub_date
2004-07-01 00:00:00pages
729-38issue
7-8eissn
0925-4773issn
1872-6356pii
S0925477304000802journal_volume
121pub_type
杂志文章abstract::In mammals, the SWI/SNF complex is involved in chromatin remodelling in a wide range of cellular events for which regulatory factors require access to DNA. In the present study, we analyzed in early postimplantation mouse embryos the expression pattern of BRM (SNF2alpha) and BRG1 (SNF2beta), which are both ATPase subu...
journal_title:Mechanisms of development
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journal_title:Mechanisms of development
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journal_title:Mechanisms of development
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journal_title:Mechanisms of development
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journal_title:Mechanisms of development
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journal_title:Mechanisms of development
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journal_title:Mechanisms of development
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journal_title:Mechanisms of development
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journal_title:Mechanisms of development
pub_type: 杂志文章
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journal_title:Mechanisms of development
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journal_title:Mechanisms of development
pub_type: 杂志文章
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journal_title:Mechanisms of development
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journal_title:Mechanisms of development
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doi:10.1016/s0925-4773(02)00054-0
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journal_title:Mechanisms of development
pub_type: 杂志文章
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更新日期:2000-08-01 00:00:00
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journal_title:Mechanisms of development
pub_type: 杂志文章,评审
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更新日期:2003-11-01 00:00:00
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journal_title:Mechanisms of development
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