浙江地区耐多药结核分枝杆菌基因突变特征分析

赵刚; 贾庆军; 吴亦斐; 黄银燕; 唐磊明; 曾美纯

doi:10.16462/j.cnki.zhjbkz.2021.01.013

浙江地区耐多药结核分枝杆菌基因突变特征分析

doi: 10.16462/j.cnki.zhjbkz.2021.01.013

1.
310021 杭州，杭州市疾病预防控制中心结核病防治所
2.
310015 杭州，杭州师范大学附属医院检验科
3.
310003 杭州，浙江大学医学院附属第一医院

基金项目:

杭州市科技发展计划项目 20191203B140

杭州市卫生健康科技计划项目 A20200788

详细信息

通讯作者:
贾庆军，E-mail: qingjunjia@126.com

中图分类号: R52
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出版历程
- 收稿日期: 2019-12-24
- 修回日期: 2020-04-20
- 刊出日期: 2021-01-10

Analysis for characteristics of genetic mutations among multi-drug resistant Mycobacterium tuberculosis (MDR-TB) isolates from Zhejiang Province

1.
Institute for Tuberculosis Control and Prevention, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China
2.
Department of Clinical Laboratory, The Affiliated Hospital of Hangzhou Normal University, Hangzhou 310015, China
3.
Department of Pathology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China

Funds:

Hangzhou Science and Technology Development Plan Project 20191203B140

Hangzhou Health Science and Technology Plan Project A20200788

More Information

Corresponding author: JIA Qing-jun, E-mail: qingjunjia@126.com

摘要

摘要: 目的分析浙江地区耐多药结核分枝杆菌(M.tuberculosis complex, MTBC)异烟肼(isoniazid, INH)和利福平(rifampicin, RIF)耐药相关基因突变特征。方法对患者痰标本阳性培养物进行菌种鉴定，提取耐多药菌株DNA，应用PCR法对inhA、katG和rpoB RRDR区进行扩增，并将扩增产物直接进行基因测序。结果共鉴定出3 317株MTBC，对应的患者中初治为3 009例，复治为308例，耐多药结核病(multidrug-resistant tuberculosis, MDR-TB)为84例，占比为2.53%(84/3 317)。其中，在INH耐药方面，47株分别在katG(315)或inhA(-15/-8)发生单位点突变，19株同时出现katG(315)和inhA(-15/-8)突变，18株未检测出上述基因突变，基因型同表型的符合率为78.57%(66/84)，突变频率最高的位点是Ser315Thr，占47.62%(40/84)。在RIF耐药方面，79株在rpoB(511、512、513、516、522、526和531位点)出现突变，2株同时出现511/513和511/516突变，突变频率最高的位点是Ser531Leu，占58.33%(49/84)，3株未检测出rpoB突变，基因型同表型的符合率为96.43%(81/84)。结论浙江地区MDR-TB流行株基因突变仍然集中在常见的基因位点，表明在本地区利用Xpert MTB/RIF筛查MDR-TB患者仍具有较高的应用价值。
- 浙江 /
- 结核 /
- inhA /
- katG /
- rpoB /
- 基因突变
Abstract: Objective To analyze the characteristics of genetic mutations associated with isoniazid (INH) and rifampicin (RIF)-resistant Mycobacterium tuberculosis (MDR-TB) isolates. Methods Culture positive sputum specimens from suspicious TB were subjected to species identification. Genomic DNAs of Mycobacterium tuberculosis complex (MTBC) were extracted. InhA, katG, and Rifampicin Resistance Determining Region (RRDR) of rpoB gene were amplified. Amplicons were performed with Sanger sequencing. Results A total of 3 317 TB were identified, including3 009 new treated, 308 retreated, and 84 MDR-TB, accounting for 2.53% (84/3 317). In INH resistant isolates, 47 had single-point mutation in katG (315 site) or inhA (-15 or -8 site), and 19 had both katG and inhA mutations. The coincidence rate of genotype with phenotype was 78.57% (66/84). The most frequent mutation was Ser315Thr (47.62%, 40/84). In RIF resistant isolates, 79 had mutations in rpoB (sites 511, 512, 513, 516, 522, 526 and 531), and 2 had mutations in 511/513 or 511/516. The most frequent mutation was Ser531Leu (58.33%, 49/84). The coincidence rate of genotype with phenotype was 96.43% (81/84). Conclusions Genetic mutations of inhA, katG and rpoB gene in Zhejiang are concentrated relatively on common gene sites, and Xpert MTB/RIF is still of high application value to screen MDR-TB in Zhejiang.
- Zhejiang /
- Tuberculosis /
- katG /
- rpoB /
- inhA /
- Genetic mutations

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图 1 研究流程简图

Figure 1. Study flowchart

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图 2 基因扩增产物电泳

注：泳道1~4分别为katG、inhA、rpoB和100 bp DNA marker。

Figure 2. Electrophoresis of gene amplification products

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表 1 84例耐多药患者特征分析

Table 1. Analysis for characteristics of 84 MDR-TB patients

特征	例数	占比(%)
性别
男	56	66.67
女	28	33.33
年龄(岁)
≤30	25	29.76
30~	21	25.00
≥50	38	45.24
户籍
本地	61	72.62
外地	23	27.38
职业
体力劳动者	55	65.48
非体力劳动者	29	34.52
实验室检测
抗酸染色阳性	57	67.86
治疗结果
治愈或完成疗程	65	77.38
治疗中	11	13.10
失败	8	9.52
肺结核分类
原发性肺结核	12	14.29
继发性肺结核	72	85.71

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表 2 84株表型耐药及10株表型敏感MTBC katG和inhA区突变位点分布情况

Table 2. Distributions of genetic mutations of katG and inhA among 84 INH^R and 10 INH^Sa

株型	突变类型	位点	核苷酸和(或)氨基酸改变		株数(N=94)
株型	突变类型	位点	核苷酸改变	氨基酸改变	株数(N=94)
耐药株	未检测出	无	无	无	18
	单位点突变	katG 315	AGC→ACC	Ser→Thr	21
			AGC→TGC	Ser→Cys	8
			AGC→AAC	Ser→Asn	5
		inhA -15	C→T	无	9
		inhA -8	T→C	无	4
	双位点突变	katG 315/inhA -15	AGC→ACC	Ser→Thr	13
		katG 315/inhA -15	C→T	无	13
		katG 315/inhA -8	AGC→ACC	Ser→Thr	6
		katG 315/inhA -8	T→C	无	6
敏感株	未检出	无	无	无	10
注：^aINH^R表示异烟肼耐药株，INH^S表示异烟肼敏感株。

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表 3 84株表型耐药及10株表型敏感MTBC rpoB核心区突变位点分布情况

Table 3. Distributions of genetic mutations of rpoB among 84 RIF^R and 10 RIF^Sa

株型	突变类型	位点	核苷酸和(或)氨基酸改变		株数(N=94)
株型	突变类型	位点	核苷酸改变	氨基酸改变	株数(N=94)
耐药株	未检测出	无	无	无	3
	单位点突变	511	CTG→CCG	Leu→Pro	1
		512	AGC→ACC	Ser→Thr	2
		513	CAA→AAA	Gln→Lys	1
		516	GAC→GTC	Asp→Val	3
		522	TCG→TTG	Ser→Leu	2
		526	CAC→GAC	His→Asp	13
			CAC→CCC	His→Pro	2
			CAC→CTC	His→Leu	1
			CAC→CGC	His→Arg	2
			CAC→AAC	His→Asn	1
		531	TCG→TTG	Ser→Leu	49
		531	TCG→TGG	Ser→Trp	2
	双位点突变	511/513	CTG→CCG	Leu→Pro	1
		511/513	CAA→AAA	Gln→Lys	1
		511/516	CTG→CCG	Leu→Pro	1
		511/516	GAC→GTC	Asp→Val	1
敏感株	未检出	无	无	无	10
注：^aINH^R表示异烟肼耐药株，INH^S表示异烟肼敏感株。

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