title: Sex-specific and left-right asymmetric expression pattern of Bmp7 in the gonad of normal and sex-reversed chicken embryos.
abstract: A genetic switch determines whether the indifferent gonad develops into an ovary or a testis. In adult females of many avian species, the left ovary is functional while the right one regresses. In the embryo, bone morphogenetic proteins (BMP) mediate biological effects in many organ developments but their roles in avian sex determination and gonadal differentiation remains largely unknown. Here, we report the sex-specific and left-right (L-R) asymmetric expression pattern of Bmp7 in the chicken gonadogenesis. Bmp7 was L-R asymmetrically expressed at the beginning of genital ridge formation. After sexual differentiation occurred, sex-specific expression pattern of Bmp7 was observed in the ovary mesenchyme. In addition, ovary-specific Bmp7 expression was reduced in experimentally induced female-to-male reversal using the aromatase inhibitor (AI). These dynamic changes of expression pattern of Bmp7 in the gonad with or without AI treatment suggest that BMP may play roles in determination of L-R asymmetric development and sex-dependent differentiation in the avian gonadogenesis.
authors.affiliation: Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan.
authors.forename: Anshin
authors.initials: A
authors.lastname: Hoshino
authors.forename: Masafumi
authors.initials: M
authors.lastname: Koide
authors.forename: Tamao
authors.initials: T
authors.lastname: Ono
authors.forename: Sadao
authors.initials: S
authors.lastname: Yasugi
mesh_terms: D000818:Animals; D047072:Aromatase Inhibitors / Q000494:pharmacology; D019521:Body Patterning; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins / Q000378:metabolism*; D002642:Chick Embryo / Q000196:embryology* / Q000378:metabolism; D012734:Disorders of Sex Development; D005260:Female; D006066:Gonads / Q000187:drug effects / Q000196:embryology* / Q000378:metabolism; D008297:Male; D019849:Sex Determination Processes; D012737:Sex Factors; D016212:Transforming Growth Factor beta / Q000378:metabolism*
chemical_list: D047072:Aromatase Inhibitors; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins; D016212:Transforming Growth Factor beta