ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2017, Vol. 48 ›› Issue (5): 818-825.doi: 10.11843/j.issn.0366-6964.2017.05.005

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Conservation Status Evaluation of Two Luyuan Chicken Populations Based on RAD-seq Simplified Genome Sequencing Technology

WANG Hong-zhi1, LI Guo-hui1, ZHANG Xian2, ZHANG Yi-ping2, ZHANG Hui-yong1, YIN Jian-mei1, SU Yi-jun1, WANG Ke-hua1, HAN Wei1*, ZOU Jian-min1*   

  1. 1. National Chicken Genetic Resources, Jiangsu Institute of Poultry Science, Yangzhou 225125, China;
    2. Zhangjiagang Livestock and Poultry Co., Ltd, Suzhou 215623, China
  • Received:2016-11-10 Online:2017-05-23 Published:2017-05-23

Abstract:

This study aimed to evaluate the conservation status of Luyuan chicken breeds which were saved in the national chicken genetic resources and Zhangjiagang Luyuan chicken conservation farm, respectively. The genetic differences of Luyuan chicken populations between national chicken genetic resources and Zhangjiagang Luyuan chicken conservation farm were analyzed by identifying SNP markers and calculating genetic statistics based on RAD-seq simplified genome sequencing technology. The results showed that 395 021 and 428 314 SNP markers were identified in two populations after two steps of data quality control. The average heterozygosity of two Luyuan chicken populations were 0.211 1 and 0.206 8, respectively. The genetic differentiation coefficient of two Luyuan chicken populations was 0.005 6. Results of cluster analysis based on Structure model showed that two Luyuan chicken populations were always clustered together and no individual was separated. These results indicated that the difference between the two populations was not significant(P>0.05). Moreover, the inbreeding coefficient of the two populations were 0.178 8 and 0.193 5, respectively. The relative high inbreeding level could be caused by the smaller scale of the initial population (rescuing conservation). The selection signal analysis found that there were some differentiation between two Luyuan chicken populations on 1, 2, 5, Z chromosomes (locus). 58 selected areas and 96 candidated genes were identified through the Fst and θπ testing. GO and KEGG analysis showed that these candidate genes were mainly enriched in some biological pathways such as energy metabolism, signal transduction, stress and immunity response pathways, and so on. In conclusion, the method of genome-wide SNP marker can more comprehensively evaluate the conservation status. The results provide the basis for further optimizing the conservation solution of Luyuan chickens.

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