title: Expression of cyp26b1 during zebrafish early development.
abstract: We have cloned the zebrafish ortholog of the mammalian cyp26b1 gene. The predicted zebrafish cyp26b1 protein shares greater than 73% identity with mammalian homologues. cDNA transfection assays showed that like human cyp26b1, zebrafish cyp26b1 is involved in limiting the activity of retinoic acid. Reverse transcription-polymerase chain reaction (RT-PCR) analysis of embryonic RNAs suggested that no maternal cyp26b1 message is detectable. Zygotic cyp26b1 message could be detected at 75% epiboly by RT-PCR and localized to presumptive rhombomere 3 and rhombomere 4 at the early two-somite (2S) stage (10.5 hpf: hour post fertilization) by whole mount in situ hybridization. As development proceeds expression expands anteriorly to include rhombomere 2 at the 10S stage (14hpf). By 14S (16hpf) expression in the hindbrain has also expanded posteriorly and encompasses rhombomere 2 through rhombomere 6. At later stages, 24 through 48 hpf, additional expression was found in the eyes, diencephalon, midbrain-hindbrain boundary, cerebellum, pectoral fin and the pharyngeal arch primordia.
authors.affiliation: Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA. qingshun@nicemice.cn
authors.forename: Qingshun
authors.initials: Q
authors.lastname: Zhao
authors.forename: Betsy
authors.initials: B
authors.lastname: Dobbs-McAuliffe
authors.forename: Elwood
authors.initials: E
authors.lastname: Linney
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002531:Cerebellum / Q000201:enzymology; D003001:Cloning, Molecular; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D004027:Diencephalon / Q000201:enzymology; D015870:Gene Expression; D017403:In Situ Hybridization; D008969:Molecular Sequence Data; D000072516:Retinoic Acid 4-Hydroxylase; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012249:Rhombencephalon / Q000201:enzymology; D014158:Transcription, Genetic / Q000187:drug effects; D014212:Tretinoin / Q000502:physiology; D015027:Zebrafish / Q000196:embryology / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D029961:Zebrafish Proteins / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D029961:Zebrafish Proteins; D014212:Tretinoin; D003577:Cytochrome P-450 Enzyme System; D000072516:Retinoic Acid 4-Hydroxylase; C502199:cyp26b1 protein, zebrafish