Characterizations of Chinese isolates of Coxiella burnetii in the com1 gene sequence

Objective: To know some genetical characterizations of Coxiella burnetii Chinese isolates by comparing the coml gene sequence. Methods: com1 gene sequences of Chinese isolates were amplified, se-quenced, and analyzed by comparing our result and the previous published data. Results: Three different com1 sequences were identified in 7 Chinese isolates. Sequence comparison indicated that the isolates harboring the QpRS plasmid could be defined as a new group and, in addition, the isolates carrying the same plas-mid type showed similar com1 gene sequence. Conclusion: Study suggests that the classification of the group based on the coml gene sequence is highly associated with the plasmid type of the isolates and, however, little related to disease forms and geographical origins of the isolates.

贝氏柯克斯体中国分离株com1基因的序列分析

目的 通过com1基因序列比较 ,了解贝氏柯克斯体中国分离株的一些遗传特征。方法 对贝氏柯克斯体中国分离株的com1基因进行扩增、测序和分析 ,将我们的结果与国外研究结果进行比较。结果 在 7个中国分离株中 ,可检测到 3种不同的com1基因序列。除质粒型相同的分离株表现出类似的com1基因序列外 ,质粒型为QpRS的中国分离株可被单独划分成一个新的基因组。结论 本研究结果显示 ,根据com1基因序列进行的贝氏柯克斯体株基因分组与分离株所含质粒型有很大的相关性 ,而与以前报道的疾病形式和分离株的地理分布无关。