ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (1): 41-49.doi: 10.11843/j.issn.0366-6964.2015.01.006

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Genetic Diversity of IL-2 Gene in 15 Chicken Populations

ZHAO Hui-jing,ZHANG Jing-jing,WEN Jie,LIU Ran-ran,ZHENG Mai-qing,LI Qing-he,MA Yue-hui,ZHAO Gui-ping*   

  1. (Institute of Animal Science,Chinese Academy of Agricultural Sciences,Beijing 100193,China)
  • Received:2014-06-09 Online:2015-01-23 Published:2015-01-23

Abstract:

To deeply study the genetic diversity of chicken Interleukin 2 (IL-2) gene and provide a theoretic basis for the breeding for disease resistance,the genetic variation of IL-2 were studied in 448 individuals from 11 Chinese native,3 introduced and one cultivated chicken breeds by DNA sequencing method in this study.A total of 13 SNPs were identified by using DNA-pooling and sequencing.The results of analysis for a genome region including 5 single nucleotide polymorphisms(SNPs) among all the individuals showed that the frequencies of different alleles differed significantly among 15 populations,suggesting IL-2 had abundant genetic variations and provided promising gene resource for disease resistance.Analysis of several population genetic indexes indicated that the Jingxing Yellow chicken had the lowest level of genetic diversity,which was consistent with its breed formation and little differences of genetic diversity were observed among other breeds.Analysis of haplotypes revealed a total of 23 hapltoyepes.Among them,H1(CAACG),H2(CAATT),H4(TGTTG),H9(TGTTG),H11(TATCG) and H16(CATCG) were unique or dominant in Chinese native chicken breeds,suggesting these haplotypes may be associated with the disease-resistant ability.

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