title: Identification and expression of zebrafish Iroquois homeobox gene irx1.
abstract: Iroquois homeoproteins are prepatterning factors that positively regulate proneural genes and control neurogenesis. We have identified a zebrafish Iroquois gene, irx1, which is highly homologous to Xenopus Xiro1, Gallus c-Irx1 and mouse Irx1. Expression of irx1 was initially detected at the bud stage. By 16 h post-fertilization (hpf), irx1 expression was exclusively limited to the prospective midbrain and hindbrain. By 24 hpf, irx1 expression was clearly detected in the acousticovestibual ganglia, tectum, tegmentum, cerebellum and rhombomere 1 but not in rhombomere 2 or mid-hindbrain boundary.
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong. bhcheng@cityu.edu.hk
authors.forename: C W
authors.initials: CW
authors.lastname: Cheng
authors.forename: C
authors.initials: C
authors.lastname: Hui
authors.forename: U
authors.initials: U
authors.lastname: Strähle
authors.forename: S H
authors.initials: SH
authors.lastname: Cheng
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001921:Brain / Q000196:embryology / Q000378:metabolism; D003001:Cloning, Molecular; D017124:Conserved Sequence; D018507:Gene Expression Regulation, Developmental; D018398:Homeodomain Proteins / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics*; D015027:Zebrafish / Q000196:embryology* / Q000235:genetics*; D029961:Zebrafish Proteins / Q000235:genetics
chemical_list: D018398:Homeodomain Proteins; C501592:Irx1 protein, mouse; D014157:Transcription Factors; D029961:Zebrafish Proteins; C501593:irx1a protein, zebrafish; C459599:irx1b protein, zebrafish