title: Prominent expression of transforming growth factor beta2 gene in the chicken embryonic gonad as revealed by suppressive subtraction cloning.
abstract: cDNA cloning from chicken embryonic gonad subtracted from tissues of the brain, heart, liver, gizzard, mesonephros, and muscle was performed to identify growth factor genes with expression unique to embryonic ovary and testis. We obtained several cDNA clones encoding known and many unknown genes. We found for the first time that the transforming growth factor beta2 (TGF-beta2) is preferentially expressed in the chicken embryonic ovary and testis. cDNA subtraction cloning with respect to the selective expression of TGF-beta2 in the ovary and testis was further analyzed by reverse transcription-polymerase chain reaction analyses of other embryonic tissues. The ontogeny of TGF-beta2 was evaluated in chicken embryonic ovary and testis. In both testis and ovary, the levels of TGF-beta2 transcripts were high during the early period of embryonic development (E7), gradually decreased until the late embryonic days (E14--E17), and then slightly increased at the last embryonic day (E21). There was no difference in the TGF-beta2 transcripts per RNA between the left and the right ovaries. TGF-beta2 may have a critical role in the regulation of the development of chicken ovarian and testicular germ cells during the embryonic period.
authors.affiliation: Laboratory of Reproductive Physiology, Division of Animal and Marine Resource Sciences, Graduate School of Agriculture, Kyushu University, 6-10-1 Hakozaki, Fukuoka, 812-8581, Japan.
authors.forename: Masa-aki
authors.initials: MA
authors.lastname: Hattori Ma
authors.forename: Hiroki
authors.initials: H
authors.lastname: Furuta
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Hiyama
authors.forename: Yukio
authors.initials: Y
authors.lastname: Kato
authors.forename: Noboru
authors.initials: N
authors.lastname: Fujihara
mesh_terms: D000818:Animals; D001921:Brain / Q000196:embryology; D001923:Brain Chemistry; D002642:Chick Embryo; D003001:Cloning, Molecular / Q000379:methods*; D018076:DNA, Complementary / Q000032:analysis; D005260:Female; D015870:Gene Expression; D015723:Gene Library; D005895:Gizzard, Avian / Q000737:chemistry / Q000196:embryology; D006066:Gonads / Q000196:embryology* / Q000378:metabolism*; D006321:Heart / Q000196:embryology; D008099:Liver / Q000737:chemistry / Q000196:embryology; D008297:Male; D008650:Mesonephros / Q000737:chemistry / Q000196:embryology; D009132:Muscles / Q000737:chemistry / Q000196:embryology; D009206:Myocardium / Q000737:chemistry; D010053:Ovary / Q000737:chemistry / Q000196:embryology*; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013737:Testis / Q000737:chemistry / Q000196:embryology*; D013997:Time Factors; D016212:Transforming Growth Factor beta / Q000235:genetics*; D053781:Transforming Growth Factor beta2
chemical_list: D018076:DNA, Complementary; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta; D053781:Transforming Growth Factor beta2