Ethanol impairs migration of the prechordal plate in the zebrafish embryo.
Exposure of vertebrate embryos to ethanol causes cyclopia, but little is known about the underlying mechanisms of this effect. Here we show that cyclopia can be induced in the zebrafish by a short ethanol treatment during early gastrula stages and is accompanied by loss of gene expression characteristic of the ventral aspects of the fore- and midbrain. Interestingly, defects in the expression of ventral brain markers are linked to impaired migration of the prechordal plate mesoderm indicating that the correct position of the prechordal plate mesoderm under the anterior neural plate in the zebrafish embryo is required for specification of the anterior neural midline. Ethanol-induced cyclopia does not, however, impair the induction of anterior neuroectodermal structures in general. Finally, as genes like goosecoid and islet-1 are expressed in prechordal plate cells in a temporal pattern similar to control embryos despite the ectopic position of expressing cells, it appears that regulation of prechordal plate-specific gene expression is largely independent of the final position of the prechordal plate.
Blader
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IGBMC, CNRS/INSERM/ULP, Illkirch, 67404, France.
Strähle
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U
D000818:Animals; D001755:Blastocyst / Q000187:drug effects; D001921:Brain / Q000187:drug effects*; D002465:Cell Movement / Q000187:drug effects*; D005576:Colforsin / Q000494:pharmacology; D004625:Embryo, Nonmammalian / Q000187:drug effects; D047108:Embryonic Development; D000431:Ethanol / Q000494:pharmacology*; D005326:Fetal Proteins / Q000235:genetics; D051858:Forkhead Transcription Factors; D005775:Gastrula / Q000187:drug effects; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects*; D051956:Goosecoid Protein; D053823:Hedgehog Proteins; D016142:Holoprosencephaly / Q000503:physiopathology; D018398:Homeodomain Proteins / Q000235:genetics; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D008845:Microinjections; D009419:Nerve Tissue Proteins / Q000378:metabolism; D051857:Otx Transcription Factors; D011506:Proteins / Q000235:genetics; D012333:RNA, Messenger / Q000378:metabolism; D012097:Repressor Proteins; D020825:T-Box Domain Proteins; D013723:Teratogens / Q000494:pharmacology; D015534:Trans-Activators / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics; D015027:Zebrafish / Q000196:embryology*; D029961:Zebrafish Proteins; D000098908:Brachyury Protein
D005576:Colforsin; D000431:Ethanol; D005326:Fetal Proteins; D051858:Forkhead Transcription Factors; D051956:Goosecoid Protein; D053823:Hedgehog Proteins; D018398:Homeodomain Proteins; D009419:Nerve Tissue Proteins; D051857:Otx Transcription Factors; D011506:Proteins; D012333:RNA, Messenger; D012097:Repressor Proteins; D020825:T-Box Domain Proteins; D013723:Teratogens; D015534:Trans-Activators; D014157:Transcription Factors; D029961:Zebrafish Proteins; D000098908:Brachyury Protein; C082243:foxa2 protein, zebrafish; C497995:gsc protein, zebrafish