ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (3): 507-514.doi: 10.11843/j.issn.0366-6964.2018.03.006

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Genetic Analysis of Polydactyly Traits in Royal Chicken and Its Candidate Genes Expression

WANG Xiang-nan, GUO Hong-wei, GUO Ya-ping, YAN Feng-bin, WANG Yan-bin, SUN Gui-rong, KANG Xiang-tao, HAN Rui-li*   

  1. College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China
  • Received:2017-06-28 Online:2018-03-23 Published:2018-03-23

Abstract:

The purpose of this study was to explore the genetic rules of polydactyly traits and the expression of its candidate genes during embryogenesis in order to provide a basis for the selection and breeding of polydactyly traits lines in Royal chicken. Royal chicken with different toe types (four-four toe, four-five toe, five-five toe) were selected, and hybridization and crossbreeding test were carried out to analyze the proportions of various toe types in offsprings, then it was compared with the theoretical values by Chi square test. The limb bud tissue samples from 5th to 10th day during embryonic development were collected and the expression of the polydactyly traits candidate genes(Lmbr1, SHH, RNF32, NOM1, MNX1 and Gli3) were analyzed. The results showed that the ratio of polydactyly to normal dactyly in four-five toe♂×four-five toe♀ group was 3.67:1, which was in accordance with the theoretical ratio of 3:1 (P>0.05). The other two groups did not fit the theoretical ratio (P<0.05). Secondly, the result of crossbreeding test showed that there were 3 toe types in offsprings from each cross male. Finally, the expression of SHH gene was very low from the 5th to 10th day during the development of limb bud tissue in Royal chicken. Lmbr1, RNF32, NOM1, MNX1, Gli3 gene expression peaks appeared on the 7th and 9th day during the development of limb bud tissue. The polydactyly trait of Royal chicken is in form of autosomal dominant inheritance, but its penetrance is different. The results indicate that the polydactyly traits may be regulated by multiple genes such as Lmbr1 and RNF32, and the critical period may be from the 7th to 9th day during embryo development.

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