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第117回日本解剖学会総会・全国学術集会 講演プログラム・抄録集 PDF ...

第117回日本解剖学会総会・全国学術集会 講演プログラム・抄録集 PDF ...

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117 <br />

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Characterization of the RNAbinding protein Musashi in zebrafish<br />

<br />

<br />

Musashi Msi is an evolutionarily conserved gene family of RNAbinding<br />

proteins RBPs that is preferentially expressed in the nervous system. The first<br />

member of the Msi family was identified in Drosophila. Drosophila Msi plays<br />

an important role in regulating asymmetric cell division of the sensory organ<br />

precursor cells. The mammalian orthologs, including human and mouse Msi1, are<br />

neural RBPs that are strongly expressed in neural stem cells NSCs. Mammalian<br />

Msi1 contributes to self renewal of NSCs through translational regulation of<br />

several target mRNAs. In this study, the zebrafish Msi ortholog zMsi1 was<br />

identified and characterized. The normal spatial and temporal expression profiles<br />

for both protein and mRNA were determined. Overall, zMsi1 was strongly<br />

expressed in neural tissue in early stages of development and exhibited similarity<br />

to mammalian Msi1 expression patterns. To reveal the in vivo function of zMsi1,<br />

morpholinos against Msi1 were introduced into onecell stage zebrafish embryos.<br />

Knock down of zmsi1 frequently resulted in aberrant formation of the CNS. These<br />

results suggest that Msi1 plays roles in CNS development in vertebrates.<br />

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PSANCAM <br />

1 2 1<br />

1<br />

2 <br />

<br />

PSANCAMpolysialic acidneural cell adhesion molecule <br />

<br />

PSANCAM 57 E5E7 <br />

PSANCAM <br />

<br />

PSANCAM <br />

BrdU E5E7 BrdU <br />

FITC <br />

PSANCAM <br />

BrdU 10 E6 <br />

BrdU <br />

E5 BrdU E6 E7 <br />

BrdU PSANCAM <br />

E5E7 PSANCAM <br />

<br />

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mRNA <br />

1 2 1<br />

1<br />

2 <br />

<br />

<br />

GnRH <br />

mRNA <br />

mRNA 2.5 3.5 <br />

3.5 <br />

4 GnRH <br />

mRNA <br />

mRNA <br />

<br />

Tol2GFP 2.5 <br />

1619 GFP <br />

GnRH GFP <br />

mRNA <br />

mRNA <br />

mRNA GnRH <br />

GnRH <br />

<br />

P<br />

CNTF <br />

<br />

<br />

<br />

<br />

<br />

cuprizone <br />

MBPCNPase <br />

<br />

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<br />

cuprizone<br />

<br />

<br />

MBPCNPase <br />

<br />

CNTF <br />

<br />

CNTF <br />

P<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

E1313.5 E11.5<br />

<br />

Islet1Lim3Lhx3 MNR2 <br />

MMCl Lim3 <br />

<br />

Islet1Lim3Foxp1<br />

E11.5 <br />

Islet1 Lim3 <br />

<br />

Foxp1 <br />

<br />

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6

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