title: Sox9b/sox9a2-EGFP transgenic medaka reveals the morphological reorganization of the gonads and a common precursor of both the female and male supporting cells.
abstract: We have established an enhanced green fluorescent protein (EGFP) transgenic medaka line that mimics the expression of sox9b/sox9a2 to analyze the morphological reorganization of the gonads and characterize the sox9b-expressing cells during gonadal formation in this fish. After the germ cells have migrated into the gonadal areas, a cluster of EGFP-expressing cells in the single gonadal primordium was found to be separated by the somatic cells along the rostrocaudal axis and form the bilateral lobes. We observed in these transgenic fish that EGFP expression persists only in the somatic cells directly surrounding the germ cells. As sex differentiation proceeds, dmrt1 and foxl2 begin to be expressed in the EGFP-expressing cells in the XY and the XX gonads, respectively. This indicates that the sox9b-expressing cells reorganize into two lobes of the gonad and then differentiate into Sertoli or granulosa cells, as common precursors of the supporting cells. Hence, our sox9b-EGFP medaka system will be useful in future studies of gonadal development.
authors.affiliation: Laboratory of Molecular Genetics for Reproduction, National Institute for Basic Biology, Okazaki, Japan.
authors.forename: Shuhei
authors.initials: S
authors.lastname: Nakamura
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Aoki
authors.forename: Daisuke
authors.initials: D
authors.lastname: Saito
authors.forename: Yoko
authors.initials: Y
authors.lastname: Kuroki
authors.forename: Asao
authors.initials: A
authors.lastname: Fujiyama
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Naruse
authors.forename: Minoru
authors.initials: M
authors.lastname: Tanaka
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D004625:Embryo, Nonmammalian; D005260:Female; D018507:Gene Expression Regulation, Developmental; D006066:Gonads / Q000196:embryology* / Q000378:metabolism; D006107:Granulosa Cells / Q000166:cytology* / Q000378:metabolism / Q000502:physiology; D049452:Green Fluorescent Proteins / Q000235:genetics* / Q000378:metabolism; D006609:High Mobility Group Proteins / Q000235:genetics* / Q000378:metabolism; D008297:Male; D009990:Oryzias / Q000196:embryology / Q000235:genetics*; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D055758:SOX9 Transcription Factor; D012708:Sertoli Cells / Q000166:cytology* / Q000378:metabolism / Q000502:physiology; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: D006609:High Mobility Group Proteins; D020033:Protein Isoforms; D055758:SOX9 Transcription Factor; D014157:Transcription Factors; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins