China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (4): 1516-1523.doi: 10.16431/j.cnki.1671-7236.2022.04.034

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Isolation and Identification of Mycoplasma synoviae Guizhou Strain and Sequence Analysis of VlhA Gene

SONG Chun1, WANG Bolin1, LI Mei1, WEN Ming1,2, WANG Kaigong1,2, CHEN Changxiu3, CHENG Zhentao1,2   

  1. 1. College of Animal Science, Guizhou University, Guiyang 550025, China;
    2. Guizhou Key Laboratory of Animal Disease and Veterinary Public Health, Guiyang 550025, China;
    3. College of Agriculture and Forestry Sciences, Linyi University, Linyi 276005, China
  • Received:2021-09-03 Online:2022-04-05 Published:2022-03-25

Abstract: 【Objective】 The aim of this study was to obtain Mycoplasma synoviae(MS) strains in Guizhou,to further develop its etiology and immunology related research.【Method】 A total of 107 samples of pharyngeal swabs,swollen joints and claw pads and swollen tissue exudate suspected to be infect with MS were collected from a broiler farm in Zhijin county,Guizhou province and detected by PCR.The samples tested positive by PCR were used to isolate and culture MS,Wright staining,biochemical test and sequence analysis of the VlhA gene were performed.【Result】 20 positive samples were tested by PCR,only 1 strain of MS was isolated from the positive samples of joint and claw pad,and the colony formed "egg-shaped" on solid medium.The isolated strain was small blue spherical stained by Wright’s in the microscope.In biochemical tests,the isolates could decompose glucose and maltose,but not arginine and urea,which was consistent with the biochemical results of MS standard strains.The target fragment of 821 bp was amplified by PCR.Nucleotide similarity analysis of the VlhA gene of the isolated strain indicated that the strain was MS,and there were regional differences in similarity with other endemic strains in GenBank.The similarity with the epidemic strains in Anhui,Chongqing,Fujian,Guangdong,Guangxi,Hubei,Hunan,Jiangsu and Yunnan was 90.3% to 99.7%.The most similar strain was MS epidemic strain in Hunan,which reached 99.7%.But the similarity with foreign reference strains was low.The phylogenetic analysis of VlhA gene showed that this strain was closely related to the domestic reference strain,but far from the foreign.【Conclusion】 In this study,a Guizhou endemic MS strain was successfully isolated and identified from chickens causing swelling of joints and foot pads with some variation.This study provided a basis for the molecular and biological characteristics of MS in Guizhou and the diagnosis and control of this disease.

Key words: Mycoplasma synoviae; isolation; identification; sequence analysis

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