Skeletal Analysis and Characterization of Gene Expression Related to Pattern Formation in Developing Limbs of Japanese Silkie Fowl

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  • Arisawa Kenjiro
    Department of Food Production Science, Faculty of Agriculture, Shinshu University Science of Biological Production, The United Graduate School of Agricultural Science, Gifu University
  • Yazawa Shigenobu
    Division of Biological Sciences, Graduate School of Science, Kyoto University
  • Atsumi Yusuke
    Department of Bioscience and Food Production, Interdisciplinary Graduate School of Science and Technology, Shinshu University
  • Kagami Hiroshi
    Department of Food Production Science, Faculty of Agriculture, Shinshu University
  • Ono Tamao
    Department of Food Production Science, Faculty of Agriculture, Shinshu University

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The Japanese Silkie (Ukokkei) is a breed of domestic fowl with several unique characteristics. Skeletal analysis revealed that an extra cartilaginous digit was apparent transiently in the wing bud of Japanese Silkie embryos between stages 32 and 36. In contrast, an extra digit of the leg resembled digit 2 in terms of its skeletal elements. Whole-mount in situ hybridization analysis revealed that Shh, Bmp-2, and Hoxd-13 genes are ex- pressed in the presumptive region of the extra digit in the leg buds at stage 26. Expression of Shh and Hoxd-13 was also apparent in the anterior region, including the presumptive area of the extra digit, in the developing wing bud of Japanese Silkie embryos. The Japanese Silkie fowl thus warrants further investigation as a potential model animal for the study of limb development.

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