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社区获得性肺炎中比较常见的病原体就是肺炎支原体(Mycoplasma pneumoniae, MP)[1]。肺炎支原体肺炎(MPP)是一种自限性疾病,但是有时会引起各种肺部疾病如支气管炎、脑炎、坏死性肺炎,严重者甚至会导致死亡[2]。MP感染的流行周期为3~4年[1, 3]。MPP还没有明确的发病机制,从临床症状分析可能是病原体入侵机体呼吸上皮细胞的纤毛状上皮细胞或者是机体免疫反应的结果[4]。P1基因具有其自然特性即高度保守性,且随着分子生物学技术的发展可根据分离株中P1氨基酸序列之间的差异把其分成两大类型P1-Ⅰ型和P1-Ⅱ型[5]。对MP流行株的基因型进行分析可对其发病机制和临床诊断治疗进行探讨[5]。本实验收集儿童的肺泡灌洗液标本,了解合肥地区儿童MP流行株基因型的现状。
儿童肺泡灌洗液肺炎支原体检出率及基因型分析
The detection rate and genotype analysis of Mycoplasma pneumonie in bronchoalveolar lavage fluid
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摘要:
目的检测136例儿童肺泡灌洗液标本感染肺炎支原体(MP)的情况并初步了解安徽合肥地区MP基因型情况。 方法采用普通PCR技术从136例儿童的肺泡灌洗液标本筛查出已感染MP的标本,并通过巢式多重PCR技术对MP阳性标本进行基因型分析,对照试验采用FH-MP标准株为DNA模版。巢式多重PCR扩增后的DNA片段构建T载体重组质粒做基因测序验证。 结果普通PCR检测显示有52例MP阳性标本(136例肺泡灌洗液标本)。巢式多重PCR技术检测显示MP阳性标本基因型均为P1-Ⅰ型,而标准株FH-MP的基因型为P1-Ⅱ型。重组质粒经过测序后进行片段对比验证其扩增条带均正确。 结论合肥地区儿童MP流行株基因型为P1-Ⅰ型,感染MP的阳性率为38.2%。 Abstract:ObjectiveTo detect the distribution of Mycoplasma pneumonie(MP) in bronchoalveolar lavage fluid of 136 children, and preliminarily understand the genotype of MP in Hefei Anhui province. MethodsThe MP infection cases in 136 bronchoalveolar lavage fluid samples were screened using PCR.The genotype of MP was analyzed using nest multiplex PCR, and the DNA temple of FH-MP standard strain was set as control.The recombinant plasmid was constructed using the amplified DNA fragment cloned by nest multiplex PCR, and sequenced. ResultsFifty-two positive MP samples were screened in 136 cases of bronchoalveolar lavage fluid using PCR.The nest multiplex PCR results showed that the genotype of MP positive samples was type P1-Ⅰ, and the genotype of standard strain FH-MP was type PCP1-Ⅱ.The sequencing results of the recombinant plasmid showed that the cloned fragment was right. ConclusionsThe genotype of epidemic strains of MP is type P1-Ⅰ, and the positive rate of MP infection is 38.2% in Hefei. -
Key words:
- Mycoplasma pneumonia /
- genotype /
- child /
- nest multiplex PCR
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[1] 沈夏梦, 华春珍, 王晓芳, 等.儿童肺炎支原体肺炎临床特点及血浆分泌型白细胞蛋白酶抑制剂的水平变化[J].临床儿科杂志, 2014, 32(8):720.. doi: 10.3969/j.issn.1000-3606.2014.08.006 [2] ZHANG Y, ZHOU Y, LI S, et al.The clinical characteristics and predictors of refractory Mycoplasma pneumoniae pneumonia in children[J].PLoS One, 2016, 11(5):e0156465. doi: 10.1371/journal.pone.0156465 [3] SHIN JE, CHEON BR, SHIM JW, et al.Increased risk of refractory Mycoplasma pneumoniae pneumonia in children with atopic sensitization and asthma[J].Korean J Pediatr, 2014, 57(6):271. doi: 10.3345/kjp.2014.57.6.271 [4] DING S, WANG X, CHEN W, et al.Decreased interleukin-10 responses in children with severe Mycoplasma pneumoniae pneumonia[J].PloS One, 2016, 11(1):e0146397. doi: 10.1371/journal.pone.0146397 [5] 王楠, 张凯, 张国成.儿童肺炎支原体西安流行株的基因分型[J].临床儿科杂志, 2013, 31(5):455. doi: 10.3969/j.issn.1000-3606.2013.05.016 [6] 汪小五, 曾宪聪, 陈伟, 等.肺炎支原体P1蛋白的制备及其应用的初步研究[J].安徽医科大学学报, 2014, 49(12):1709. [7] KENRI T, OKAZAKI N, YAMAZAKI T, et al.Genotyping analysis of Mycoplasma pneumoniae clinical strains in Japan between 1995 and 2005:type shift phenomenon of M.pneumoniae clinical strains[J].J Med Microbiol, 2008, 57(4):469. doi: 10.1099/jmm.0.47634-0 [8] 严春霞, 闻人庆, 陆伟宏, 等.可视化环介导等温扩增技术在肺炎支原体检测中的应用[J].临床检验杂志, 2016, 34(2):85. [9] 黄梅霞.两种儿童肺炎支原体检测方法的对比分析及临床应用[J].实用医技杂志, 2017, 24(4):399. [10] 闫晓苏, 赵飞, 张建中.新型p1基因型肺炎支原体分型方法的建立与应用[J].微生物学报, 2012, 52(2):262.