title: Temporal and spatial localization of three germline-specific proteins in medaka.
abstract: We show that germline-specific proteins, olvas (vasa), nanos, and tdrd1 (tudor), alter their localization in the cytoplasm during germline development in the medaka (Oryzias latipes). By immunohistochemical analysis, these three germline-specific proteins were detectable on granule-like structures in the cytoplasm of migrating primordial germ cells. In the germ cells of the gonadal primordia, these granules formed a hollow area lacking these three protein components. During the sexual differentiation of the female gonads, the granules were found to be reduced in size in the germ cells undergoing cystic division and they showed a perinuclear localization in the oocytes. However, the germ cells in the male gonads retained their hollow granules during this early sex differentiation stage. We further demonstrate the differential localization of olvas, nanos, and tdrd1 on these granules during medaka germline development.
authors.affiliation: Laboratory of Molecular Genetics for Reproduction, National Institute for Basic Biology, Okazaki, Japan.
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Aoki
authors.forename: Issei
authors.initials: I
authors.lastname: Nagao
authors.forename: Daisuke
authors.initials: D
authors.lastname: Saito
authors.forename: Youko
authors.initials: Y
authors.lastname: Ebe
authors.forename: Masataka
authors.initials: M
authors.lastname: Kinjo
authors.forename: Minoru
authors.initials: M
authors.lastname: Tanaka
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D053487:DEAD-box RNA Helicases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004625:Embryo, Nonmammalian / Q000166:cytology / Q000378:metabolism* / Q000648:ultrastructure; D047108:Embryonic Development; D029941:Fish Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D005854:Germ Cells / Q000166:cytology / Q000378:metabolism* / Q000648:ultrastructure; D006066:Gonads / Q000196:embryology* / Q000378:metabolism; D046529:Microscopy, Electron, Transmission; D008969:Molecular Sequence Data; D009990:Oryzias / Q000196:embryology* / Q000378:metabolism; D010802:Phylogeny; D016415:Sequence Alignment; D012733:Sex Differentiation; D014158:Transcription, Genetic
chemical_list: D029941:Fish Proteins; C418050:Vas protein, Oryzias latipes; D053487:DEAD-box RNA Helicases