| Project/Area Number |
06640867
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
生物形態・構造
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
NAKAMURA Masahisa Hiroshima University Laboratory for Amphibian Biology, Professor, 理学部・附属両生類研究施設, 教授 (40130025)
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| Co-Investigator(Kenkyū-buntansha) |
TAKASE Minoru Hiroshima University Laboratory for Amphibian Biology, Assist, Researcher, 理学部・附属両生類研究施設, 教務員 (80226779)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Calreticulin / Calnexin / Frogs / Testis / Ovary / Ad4BP / cDNA / Sex reversal / calre tic ulin / c alnexin / frogs / ovary / sex reversal / testis / 5αレダクターゼ / 3β-HSD / calreticulin様蛋白 / クローニング |
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| Research Abstract |
cDNA clones encoding the frog, Rana rugosa calnexin (2.2 kb) and calreticulin (2.4 kb) were isolated and sequenced. The CLX gene was weakly expressed only in the liver, while the CLT gene was expressed in all the tissues examined of adult frogs. Young frogs at stage XXV produced an extremely strong signal of the CLT gene expression in the ovary, but not in the testis. When the masculinization was induced by testosterone propionate (TP) , the CLT gene expression was significantly inhibited in gonads of tadpoles. In immunohistological studies, CLT was not appreciably detected in oocytes in ggonads of tadpoles at stage 18-19, but detected in the whole cytoplasm of growing oocytes of frogs after metamorphosis. This protein then was squeezed toward the nucleus as yolk granules were accumulated. Our results suggest that the CLT,but not CLX gene is expressed in oocytes during maturation in the frog, R.rugosa. The masculinization of this frog is at least partly associated with the suppression of the CLT gene expression in differentiating gonads. In addition, A 2.2-kb cDNA of Ad4BP,which is known to be a key gene for differentiation of gonad and adrenal in mammalians, was also isolated and sequenced. The Ad4BP gene expression during development of frogs and a sex hormonal regulation of its gene expression are now under investigations.
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