Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (4): 670-678.doi: 10.11843/j.issn.0366-6964.2020.04.003

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Study on Genetic Evolution of 19 Indigenous Chicken Breeds Based on RAD-seq

HAN Wei*, ZHU Yunfen, YIN Jianmei, LI Guohui, XUE Qian, ZHANG Huiyong, SHEN Haiyu, SU Yijun, DOU Xinhong, WANG Kehua, ZOU Jianmin   

  1. National Chickens Genetic Resources, Jiangsu Institute of Poultry Science, Yangzhou 225125, China
  • Received:2019-10-09 Online:2020-04-25 Published:2020-04-21

Abstract: The purposes of this study were to reveal the genetic evolution of local chicken breeds at the genomic level and to discover genes with important germplasm characteristics. Restriction site-associated DNA sequencing (RAD-seq) technology was employed to identify single nucleotide polymorphism (SNP) markers in 19 indigenous chicken breeds. For each breed, thirty individuals(10 males and 20 females) were selected as experimental materials according to their family records. The genetic diversity and structure were analyzed by calculating the indicators of genetic statistics, which contained observed heterozygosity (Ho), nucleotide diversity (Pi), inbreeding coefficients (Fis), genetic differentiation coefficients (Fst) and gene flows (Nm). The selected genes were also identified through genome selective signals testing. The results showed that 400 562 SNP markers were identified in 19 indigenous chicken populations after data quality control. The PJ and WC populations had the highest genetic diversity, with Ho 0.246 8, 0.243 0, and Pi 0.278 1, 0.265 5, respectively. The DJ population had the lowest Ho and Pi, which were 0.156 0 and 0.157 2,respectively. The Fis in DX and BJ populations were higher than 0.160 0. The Fst among PJ and WC, HX, ZZ, WX, HX and WC, ZZ and CH were all lower than 0.100 0, correspondingly the Nm were all higher than 0.240 0. In terms of single population, the DJ population had higher Fst and lower Nm when compared to other chicken breeds. The phylogenetic tree, constructed using two foreign chicken breeds AK and RW as outgroups, divided the 19 indigenous chicken breeds into 5 clusters, which was consistent with their breeding history and geography distribution. In total, 26 selected areas and 31 candidate genes were identified through the Z transformation of heterozygosity (ZHp) signal testing. These selected genes were widely involved in the biological processes of immune system regulation, reproduction regulation, response to stress and metabolism. In conclusion, the genomic SNP markers have more advantage in revealing genetic diversity and structure of indigenous chicken breeds. The selection effects are mainly reflected in the shaping of local chicken breeds' resistance and disease resistance characteristics, gamete vitality and behavior.

Key words: indigenous chicken breed, RAD-seq, genetic evolution, selective signal

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