title: Heterogeneity across the dorso-ventral axis in zebrafish EVL is regulated by a novel module consisting of sox, snail1a and max genes.
abstract: In vertebrates, the dorso-ventral (DV) axis is defined by the combinatorial action of localised Wnt, FGF and Nodal signalling along with the antagonizing activities of Chordin and BMP pathways. Our knowledge of the factors that may act in concert with these core pathways to regulate early embryonic patterning is far from complete. Furthermore, while all three germ layers respond to these patterning cues, it is not clear whether in zebrafish the outermost protective epithelium, the enveloping layer (EVL), is also patterned along the DV axis. Here, we have identified a transgenic line driving GFP under a crestin promoter, which specifically labels the dorsal domain of the EVL suggesting heterogeneity in the EVL across the DV axis. Our attempts to understand how the expression from this promoter fragment is regulated specifically in the dorsal domain, have unravelled potential novel players involved in early EVL and embryonic patterning. We show that along with Nodal signalling components, four proteins Sox11b, Sox19b, Snail1a and Max are involved in regulating the size of this EVL domain. However, Chordin-BMP signalling might be dispensable for the dorso-ventral patterning of the EVL. For the first time, this transgenic line unravels the heterogeneity in the EVL and will serve as an important tool in understanding the molecular basis of the DV patterning of the EVL.
authors.affiliation: Max-Planck Institut für Entwicklungsbiologie, Department of Genetics, Tuebingen, Germany.
authors.forename: Yi-Yen
authors.initials: YY
authors.lastname: Chen
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Harris
authors.forename: Mitchell P
authors.initials: MP
authors.lastname: Levesque
authors.forename: Christiane
authors.initials: C
authors.lastname: Nüsslein-Volhard
authors.forename: Mahendra
authors.initials: M
authors.lastname: Sonawane
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors / Q000235:genetics* / Q000378:metabolism; D019521:Body Patterning; D055396:Bone Morphogenetic Protein 2 / Q000502:physiology; D004625:Embryo, Nonmammalian / Q000166:cytology / Q000378:metabolism; D015870:Gene Expression; D018507:Gene Expression Regulation, Developmental; D006023:Glycoproteins / Q000378:metabolism; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism; D011401:Promoter Regions, Genetic; D055747:SOX Transcription Factors / Q000235:genetics* / Q000378:metabolism; D015398:Signal Transduction; D000071250:Snail Family Transcription Factors; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D015027:Zebrafish / Q000196:embryology* / Q000235:genetics / Q000378:metabolism; D029961:Zebrafish Proteins / Q000235:genetics* / Q000378:metabolism / Q000502:physiology
chemical_list: D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D055396:Bone Morphogenetic Protein 2; D006023:Glycoproteins; D036341:Intercellular Signaling Peptides and Proteins; C499328:Max protein, zebrafish; D055747:SOX Transcription Factors; D000071250:Snail Family Transcription Factors; D014157:Transcription Factors; D029961:Zebrafish Proteins; C405936:bmp2b protein, zebrafish; C514487:snai1a protein, zebrafish; C054234:chordin