Email Alert | RSS    帮助

中国防痨杂志 ›› 2025, Vol. 47 ›› Issue (8): 1031-1037.doi: 10.19982/j.issn.1000-6621.20250054

• 论著 • 上一篇    下一篇

荧光PCR探针熔解曲线技术和DNA微阵列芯片技术鉴定分枝杆菌菌种的研究

樊瑞芳, 代小伟, 杨新宇, 陈双双, 陈昊, 于兰, 赵琰枫, 李传友(), 王嫩寒()   

  1. 北京市疾病预防控制中心结核病实验室,北京100035
  • 收稿日期:2025-02-12 出版日期:2025-08-10 发布日期:2025-08-01
  • 通信作者: 李传友,Email: lichuanyou@ccmu.edu.cn; 王嫩寒,Email: hean_1983@126.com
  • 基金资助:
    北京市疾病预防控制中心科研培育专项(2023-KYJH-04)

A study on the identification of Mycobacterium species using fluorescent PCR probe melting curve technique and DNA microarray chip technique

Fan Ruifang, Dai Xiaowei, Yang Xinyu, Chen Shuangshuang, Chen Hao, Yu Lan, Zhao Yanfeng, Li Chuanyou(), Wang Nenhan()   

  1. Tuberculosis Labroatory, Beijing Center for Disease Prevention and Control,Beijing 100035, China
  • Received:2025-02-12 Online:2025-08-10 Published:2025-08-01
  • Contact: Li Chuanyou, Email: lichuanyou@ccmu.edu.cn; Wang Nenhan, Email: hean_1983@126.com
  • Supported by:
    Beijing Center for Disease Prevention and Control Research and Cultivation Program(2023-KYJH-04)

摘要:

目的: 研究荧光PCR探针熔解曲线技术(简称“熔解曲线法”)和DNA微阵列芯片技术(简称“基因芯片法”)在分枝杆菌菌种鉴定方面的临床应用价值。方法: 选取熔解曲线法和基因芯片法检测范围内的分枝杆菌标准菌株,以及2016年1月至2023年8月北京市疾病预防控制中心结核病实验室保存的疑似非结核分枝杆菌(nontuberculous mycobacterium, NTM)的临床分离菌株,采用2种方法进行检测分析,对检测异常的菌株进行全基因组测序分析。结果: 共选取19种分枝杆菌标准菌株,每种各1株;采用熔解曲线法和基因芯片法对标准菌株进行检测,符合率均为100.00%;收集到临床分离菌株180株,经熔解曲线法和基因芯片法鉴定为结核分枝杆菌复合群(Mycobacterium tuberculosis complex, MTB)的菌株8株,1株MTB合并偶发分枝杆菌,NTM菌株171株。2种方法检测临床分离菌株的一致率为87.78%(158/180);检测一致的149株NTM菌株中,占比前4位的依次为鸟分枝杆菌复合群(MAC)[38.26%(57/149)]、龟分枝杆菌或脓肿分枝杆菌[24.83%(37/149)]、堪萨斯分枝杆菌[17.45%(26/149)]、偶发分枝杆菌[12.75%(19/149)]。2种方法鉴定结果不同的菌株22株,9株为MAC;1株基因芯片法鉴定为胞内分枝杆菌,熔解曲线法鉴定为慢生黄分枝杆菌;1株基因芯片法鉴定为土分枝杆菌,熔解曲线法鉴定为不产色分枝杆菌。10株基因芯片法有菌种鉴定结果,熔解曲线法无法判读;1株基因芯片法无法判读,熔解曲线法判读为慢生黄分枝杆菌。采用全基因组测序计算平均核苷酸一致性(average nucleotide identity,ANI),检测出爱知戈登氏菌(ANI=99.102)、沃林斯基分枝杆菌(ANI=97.822)、慕里黑分枝杆菌(ANI=97.365)、外来分枝杆菌(ANI=97.730/97.981/96.930)、大口非鲫分枝杆菌(ANI=96.277)。结论: 熔解曲线法和基因芯片法在分枝杆菌菌种鉴定方面均具有较好的临床应用价值,且熔解曲线法鉴定结果准确度更高。

关键词: 分枝杆菌感染, 分枝杆菌,结核, 分子探针技术, 诊断, 鉴别

Abstract:

Objective: To compare the clinical application value of fluorescent PCR probe melting curve assay (MeltPro) and DNA microarray chip technique for the Mycobacterium species identification. Methods: We collected the reference strains within the detection scope of both methods and the clinical isolates suspected to be nontuberculosis mycobacteria (NTM) stored in the Tuberculosis Laboratory the Beijing Center for Disease Control and Prevention from January 2016 to August 2023, and used the two methods for species identification. Strains yielding discrepant results underwent whole-genome sequencing analysis. Results: A total of 19 reference strains (one per species) were selected, with both the Melting Curve Method and the Gene Chip Method achieving a 100.00% concordance rate for their identification. A total of 180 clinical strains were collected, of which 8 strains were identified as Mycobacterium tuberculosis complex (MTBC), 1 strain showed the MTBC co-occuring with Mycobacterium fortuitum, and 171 strains were identified as NTM. The overall concordance rate between the two methods for clinical strains was 87.78% (158/180). The top four species by prevalence were Mycobacterium avium intracelluar complex (MAC)(38.26% (57/149)), Mycobacterium chelonae or Mycobacterium abscess (24.83% (37/149)), Mycobacterium kansas (17.45% (26/149)), and Mycobacterium fortuitum (12.75% (19/149)) in 149 NTM strains. Discrepant results occurred in 22 strains: 9 showed MAC discordance between two methods, 1 strain was identified as an Mycobacterium intracellulare using the DNA microarray chip technique, but as Mycobacterium lentiflavum by MeltPro,1 strain was identified as an Mycobacterium terrae using the DNA microarray chip, and as Mycobacterium nonchromogenicum by MeltPro, 10 strains had the identification results by DNA microarray chip, but yielded uninterpretable results by MeltPro, and 1 strain was uninterpretable by DNA microarray chip, but identified as Mycobacterium lentiflavum by MeltPro. Gordonia aichiensis (ANI=99.102),Mycobacterium wolinskyi (ANI=97.822),Mycobacterium monacense (ANI=97.365),Mycobacterium peregrinum (ANI=97.730/97.981/96.930) and Mycobacterium stomatepiae (ANI=96.277) were identified by WGS and calculation of Average Nucleotide Identity(ANI). Conclusion: Both the MeltPro assay and DNA microarray chip method demonstrate good clinical application value for the identification of Mycobacterium species; however, the MeltPro assay exhibits higher accuracy.

Key words: Mycobacterium infections, Mycobacterium tuberculosis, Molecular probe techniques, Diagnosis, differential

中图分类号: