47株空肠弯曲菌湖北禽源株的多位点序列分型

Multilocus sequence typing analysis of 47 Campylobacter jejuni strains isolated from poultry in Hubei province

【目的】为了解湖北地区家禽空肠弯曲菌的流行状况及其分子特征,应用多位点序列分型方法对2013–2014年的47株禽源空肠弯曲菌湖北分离株进行分子分型研究。【方法】以空肠弯曲菌的7个管家基因aspA、glnA、gltA、glyA、pgm、tkt和uncA为目的基因,提取样本基因组后PCR扩增,测序和分析。将测序结果上传数据库进行比对,制作成多位点序列分型(Multilocus sequence typing,MLST)遗传进化树。【结果】分离株共有38个ST型,10个克隆群,其中最多的克隆群为ST-353CC和ST-464CC,发现2个新的等位基因编号和25个新的ST型。遗传进化树显示,不同家禽宿主中空肠弯曲菌序列型存在一定的差异,不同地区和来源的空肠弯曲菌呈现出遗传多样性。【结论】本研究对湖北分离的47株禽源空肠弯曲菌进行了MLST分析,其结果显示菌株多样性较为丰富,将为我国家禽空肠弯曲菌的流行病学调查提供科学的数据。

[Objective] To study the epidemiological and molecular characteristics of Campylobacter jejuni in poultry in Hubei province, we used multilocus sequence typing method to classify 47 local C. jejuni strains. [Methods] Genomic DNA of each isolated strain was extract, seven housekeeping genes including asp A, gln A, glt A, gly A, pgm, tkt and unc A were amplified by PCR and sequenced, and then the sequences of genes were analyzed using MLST database. [Results] There were a total of 38 sequence types and 10 clonal complexes, and ST353 and ST464 complexes were the largest amount of the population of C. jejuni analyzed, of which 2 new allelic profile and 25 new sequence types were found. Phylogenetic tree shows that sequence types from different types of poultry and different regions were different. [Conclusion] Forty-seven C.jejuni strains isolated from poultry in Hubei were analyzed using MLST and showed abundant genetic diversity, it will provide scientific data to the epidemiological investigation of C. jejuni in Hubei, China.