title: Oocyte-specific expression of growth/differentiation factor-9.
abstract: Growth/differentiation factor-9 (GDF-9) is a previously described member of the transforming growth factor-beta superfamily expressed specifically in the ovary in adult mice. Using in situ hybridization methods, we have localized the expression of GDF-9 messenger RNA (mRNA) exclusively to oocytes. GDF-9 mRNA was detected in oocytes at all stages of follicular development, except in primordial follicles, in both neonatal and adult ovaries. GDF-9 mRNA continued to be expressed in oocytes after ovulation, but disappeared by 1.5 days after fertilization. Based on Western analysis of ovarian extracts using antibodies raised against recombinant GDF-9 protein, GDF-9 mRNA expressed by oocytes appears to be translated. A human homolog of GDF-9 was isolated from a complementary DNA library prepared from adult ovary mRNA. The predicted human protein is 90% identical to murine GDF-9 in the mature portion of the molecule. These results are significant because no other growth factor-like molecules have been shown to be expressed specifically by oocytes and, together with results of previous studies, suggest that ovarian development and function are regulated by factors produced by both oocytes and support cells of the ovary.
authors.affiliation: Department of Molecular Biology and Genetics Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: McGrath
authors.forename: A F
authors.initials: AF
authors.lastname: Esquela
authors.forename: S J
authors.initials: SJ
authors.lastname: Lee
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000831:Animals, Newborn; D055430:Bone Morphogenetic Protein 15; D018076:DNA, Complementary / Q000235:genetics; D004527:Egg Proteins / Q000096:biosynthesis* / Q000235:genetics; D004971:Estrus; D005260:Female; D005306:Fertilization; D005786:Gene Expression Regulation; D055429:Growth Differentiation Factor 9; D006133:Growth Substances / Q000096:biosynthesis* / Q000235:genetics; D006801:Humans; D017403:In Situ Hybridization; D036341:Intercellular Signaling Peptides and Proteins; D051379:Mice; D008969:Molecular Sequence Data; D009865:Oocytes / Q000378:metabolism*; D009928:Organ Specificity; D010053:Ovary / Q000166:cytology / Q000254:growth & development; D010060:Ovulation; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity
chemical_list: C525901:BMP15 protein, human; C525902:Bmp15 protein, mouse; D055430:Bone Morphogenetic Protein 15; D018076:DNA, Complementary; D004527:Egg Proteins; C525897:GDF9 protein, human; C525898:Gdf9 protein, mouse; D055429:Growth Differentiation Factor 9; D006133:Growth Substances; D036341:Intercellular Signaling Peptides and Proteins; D012333:RNA, Messenger