ニホンウズラの喉房形質の頭部骨格異常による遺伝分析

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  • 都築 政起
    名古屋大学農学部家畜育種学教室 大阪府立大学農学部実験動物学講座
  • 若杉 昇
    名古屋大学農学部家畜育種学教室 名古屋大学農学部家畜繁殖学教室

書誌事項

タイトル別名
  • A genetic analysis on the throat-tuft character of Japanese quail (Coturnix coturnix japonica) based on the head-skeleton abnormality.
  • ニホンウズラ喉房形質の頭部骨格異常による遺伝分析〔英文〕
  • ニホンウズラ コウボウ ケイシツ ノ トウブ コッカク イジョウ ニ ヨル イ

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The hfdTt (hyomandibular furrow closure defect of the throat-tuft type) gene of Japanese quail (Coturnix coturnix japonica) causes a hyomandibular furrow (HF) defect that leads to formation of a throat tuft, ear-opening abnormality, and head-skeleton abnormality. So far, the penetrance of the mutant gene has been estimated to be approximately 30-55% when the HF defect is employed as a key character for a genetic analysis. Our recent study has revealed that the incidence of the head-skeleton abnormality in 15-day embryos of the throat-tuft (TT) strain (hfdTt/hfdTt) is 88%, which is considerably higher than that of the HF defect (53%). In the present study, therefore, a genetic analysis was per-formed employing the head-skeleton abnormality as a key character. In mating experiments between the TT and control strains, the incidence of the head-skeleton abnormality was 23% and 42% at F2 and backcross generations, respec-tively. This result indicated the penetrance of the hfdTt gene to be constant with a value of approximately 88% at the skeleton level. The above results show that the penetrance of the hfdTt gene is high and hard to be influenced by a genetic background at the head-skeleton level, and low and tends to be influenced by a genetic background at the level of the HF closure defect. These observations suggest that the mesodermal tissues are primarily affected by the hfdTt gene and these abnormalities may secondarily affect the epidermal tissues.

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