Genotyping, drug resistance and molecular epidemic characteristics of Mycobacterium tuberculosis
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摘要: 目的 结核分枝杆菌是临床上罕见的疾病,常见类型较多,且随着临床抗结核药物的大量、不合理使用,导致结核分歧杆菌耐药性较高。因此,本文主要探讨结核分枝杆菌基因分型与耐药性及分子流行特征。 方法 选择2018年1月—2018年12月杭州师范大学附属医院胸外科测定的结核分枝杆菌391株作为对象,所有病原菌均采用寡核苷酸分型(spoligotyping)法完成基因的分型;选择一线抗结核药物利福平(RFP)、乙胺丁醇(EMB)、异烟肼(INF)及链霉素(SM)药物进行药敏试验。 结果 391株结核分枝杆菌均完成基因分型,其中北京家族结核分枝杆菌339株,占86.70%;非北京家族结核分枝杆菌52株,占13.30%;Spoligotyping测定结果表明:北京家族菌分子流行病学仅与35~43之间的9个间隔区呈阳性;而其余结核分枝杆菌集中在35~43间1~5个位点呈阴性反应;391株结核分枝杆菌基因分型排在前3位的分别为北京型、T1型与新发现基因型,分别占86.70%、5.12%和3.58%;391株结核分枝杆菌均完成耐药性分析,北京型结核分枝杆菌与非北京型结合分枝杆菌对于RFP、EMB、INF及SM耐药性比较差异均无统计学意义(均P>0.05)。 结论 结核分枝杆菌基因呈多态性,而分子流行病学特点以北京家族为主,且与耐药性无明显的相关性。Abstract: Objective To investigate the genotyping, drug resistance and molecular characteristics of Mycobacterium tuberculosis. Methods A total of 391 Mycobacterium tuberculosis strains were selected from department of thoracic surgery from January to December 2018, and genotyped by spoligotyping method. First-line anti-tuberculosis drugs rifampicin (RFP), ethambutol (EMB), isoniazid (INF) and streptomycin (SM) were used for drug sensitive testing. Results The results of genotyping showed that the Beijing family strains were 339 strains (86.70%), the non-Beijing family were 52 strains (13.30%). Spoligotyping showed that the molecular epidemiology of Beijing family bacteria was only positive with 9 compartments between 35 and 43, while the remaining strains was negative in 1-5 sites between 35 and 43. The 391 strains were genotype ranked in the top three: Beijing type, T1 type and newly type, accounting for 86.70%, 5.12%, and 3.58%, respectively. There was no significant difference in the resistance of Beijing-type Mycobacterium tuberculosis to non-Beijing-type mycobacteria for RFP, EMB, INF and SM (all P>0.05). Conclusion The Mycobacterium tuberculosis gene is polymorphic, while the molecular epidemiology characteristics are mainly in the Beijing family and have no significant correlation with drug resistance.
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