A genetic analysis on the throat-tuft character of Japanese quail (Coturnix coturnix japonica) based on the head-skeleton abnormality.

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  • TSUDZUKI Masaoki
    Laboratory of Animal Genetics, School of Agriculture, Nagoya University Department of Laboratory Animal Science, College of Agriculture, University of Osaka Prefecture
  • WAKASUGI Noboru
    Laboratory of Animal Genetics, School of Agriculture, Nagoya University Laboratory of Animal Reproduction, School of Agriculture, Nagoya University

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Other Title
  • 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
  • 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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