Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (6): 1670-1676.doi: 10.11843/j.issn.0366-6964.2021.06.021

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Cloning and Sequence Analysis of H and F Genes of Canine Distemper Virus Strain from Red Panda

JIANG Mei1, CHEN Wu2, ZHAI Junqiong2, BU Wandi1, XIE Yilun1, LIU Canbin1, SHAN Fen2*, LUO Manlin1*   

  1. 1. College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China;
    2. Guangzhou Zoo, Guangzhou Wildlife Research Center, Guangzhou 510070, China
  • Received:2020-10-23 Online:2021-06-23 Published:2021-06-22

Abstract: To understand the genetic variation of a strain (GD-1) of canine distemper virus (CDV) from captive red panda, the H and F genes of the CDV were cloned by RT-PCR, then were sequenced and analyzed. The results showed that the H gene sequence of this isolate had the highest nucleotide similarity (96%) with the CDV strain (accession number:GU266280) reported from Denmark in GenBank, and the F gene sequence had the highest nucleotide similarity with the CDV strain (accession number:KY057355) reported from Brazil. The sequences of CDV representative strains were downloaded for genetic evolution, amino acid sequence alignment and molecular characterization analysis. The results showed that there were 8 potential N-glycation sites in H protein, which were located at sites 19, 149, 309, 391, 422, 456, 587 and 603, respectively. The amino acid sequence of the SLAM receptor binding site of H protein was the same as that of Eurasian wild type virulent strain. Compared with the vaccine strains, the amino acid sequences at positions 530, 549 were different. Compared with other CDV reference strains, there were significant variations in H protein at 24 and 41 sites. The amino acid homology between H protein and standard virulent strain A75/17 was 95.2%. The amino acid sequence similarity with five vaccine strains such as Onderstepoort and Convac was 88.2%-89.3%. There were six N-glycosylation sites in F protein, which were located at 62, 108, 141, 173, 179 and 517 sites, respectively. The amino acid similarity between F protein and other vaccine strains ranged from 89.1% to 89.7%. Compared with other reference strains, there were eleven amino acid mutations in 115, 130 and so on. The genetic evolution tree based on H and F genes was constructed. The results showed that the strain was located in a small evolutionary branch of Asia-4 type, which was different from the current epidemic strains mainly located in Asia-1 type in China. In this study, the Asia-4 genotype CDV wild strain from red panda was reported for the first time, and the H and F genes of the strain were sequenced, which is of great significance for the study of genetic variation, epidemiological investigation, disease prevention and control and vaccine development of CDV epidemic strains in China.

Key words: red panda, canine distermper, H gene, F gene, sequence analysis

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