Isolation, expression and regulation of a zebrafish paraxis homologue.
The formation of somites involves the subdivision of segmented presomitic mesoderm into segmentally arranged somite blocks. In mice and chicks, the basic-helix-loop-helix (bHLH) gene, paraxis, is involved in this process. Here, we report the isolation of a zebrafish homologue of paraxis, par1. par1 is expressed in presomitic paraxial mesoderm from late gastrula stages, and expression is maintained in ventrolateral cells after somite formation. In spt- embryos, par1 expression is both delayed and severely reduced whereas in flh- embryos, ectopic transcripts are detected in axial mesoderm. Spatial regulation of par1 expression within the somites is affected in several mutants with defects in axial midline tissues.
Shanmugalingam
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Department of Anatomy and Developmental Biology, University College London, Gower Street, London WC1E 6BT, UK.
Wilson
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SW
D000595:Amino Acid Sequence; D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification; D005775:Gastrula / Q000378:metabolism; D018257:Helix-Loop-Helix Motifs / Q000235:genetics*; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D006801:Humans; D008648:Mesoderm / Q000378:metabolism; D008969:Molecular Sequence Data; D009024:Morphogenesis / Q000235:genetics; D009687:Nuclear Proteins; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D019170:Somites / Q000378:metabolism*; D013045:Species Specificity; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D014714:Vertebrates / Q000378:metabolism; D015027:Zebrafish / Q000196:embryology / Q000235:genetics*; D029961:Zebrafish Proteins
D051792:Basic Helix-Loop-Helix Proteins; D004268:DNA-Binding Proteins; D018398:Homeodomain Proteins; D009687:Nuclear Proteins; D014157:Transcription Factors; D029961:Zebrafish Proteins; C096660:noto protein, zebrafish; C512784:tcf15 protein, zebrafish