China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (4): 1413-1421.doi: 10.16431/j.cnki.1671-7236.2022.04.023

• Genetics and Breeding • Previous Articles     Next Articles

Screening of Specific SNP Sites in Tahe Red Deer Based on Resequencing Technology

DENG Yihua1,2, WANG Tianjiao2, WANG Hongliang2, DONG Yimeng2, LIU Xin1, XING Xiumei2   

  1. 1. College of Wildlife Resources Northeast Forestry University, Harbin 150006, China;
    2. Key Laboratory of Molecular Biology of Special Economic Animals, Institute of Special Products, Chinese Academy of Agricultural Sciences, Changchun 130112, China
  • Received:2021-09-30 Online:2022-04-05 Published:2022-03-25

Abstract: :【Objective】 To screen high quality single nucleotide polymorphic site (SNP) of Tahe red deer,construct specific molecular genetic markers, provide reference for pure breed identification of Tahe red deer. 【Method】 The whole genome of 32 blood DNA samples of Tahe red deer collected by the National Special Economic Animal Resource Sharing Platform in 1999 was re-sequenced. Compared with the chromosome-level reference genome of sika deer, the alignment rate, coverage and sequencing depth were counted. SNPEff was used to count the distribution of SNP on each chromosome, SNPhylo was used to construct a molecular evolutionary tree based on the sites, VCFTOOLS was used to calculate the genetic differentiation index(Fst), and the Fst value was sorted in descending order and the threshold was settet as Fst≥0.25 to eliminate the unqualified loci. R language was used for principal component analysis, the top 1 500 SNPs of 33 chromosomes was counted, the eigenvalues of the top 100 SNPs was extracted, and the PCA cluster diagrams were drew respectively. 【Result】 The results of whole-genome resequencing showed that the effective data volume of the blood genomic DNA of 32 Tahe red deer that passed the quality inspection was 868 791 354 600 bp, and the sequencing quality met the requirements of subsequent data analysis. The average comparison rate of the 32 samples sequencing data was 98.06%, the average coverage was 97.66%, and the average depth was 6.787. After filtering, 20 139 122 high-quality SNPs were obtained, of which SNPs were the most distributed on chromosome 4, and more than 90% of the mutations were located in the intergenic and exon regions. The number of candidate specific SNP sites after establishment was 12 050 781. 544 717 SNPs were selected by VCFTOOLS. The top 1 500 SNPs of each chromosome were selected for PCA, the PCA results showed that when the number of SNP was decreased from 49 500 to 100, the discrimination efficiency was not decreased. Finally, 100 SNPs with strong specificity and high stability were screened out.【Conclusion】 100 Tahe red deer-specific SNPs were obtained through whole-genome resequencing technology and bioinformatics analysis, which provided a theoretical basis for the identification of purebred Tahe red deer and the screening of core germplasm.

Key words: Tahe red deer; resequencing technology; SNPs; screening

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