中国农业科学 ›› 2026, Vol. 59 ›› Issue (10): 2276-2287.doi: 10.3864/j.issn.0578-1752.2026.10.015

• 畜牧·兽医 • 上一篇    下一篇

细胞和病毒活疫苗中支原体污染的荧光定量PCR检测方法的建立

刘丹1,2(), 高建帅1(), 钱佳豪1, 张博源1, 李慧彤1,2, 丁家波1, 熊涛2(), 沈青春1()   

  1. 1 中国农业科学院北京畜牧兽医研究所/农业农村部动物生物安全风险预警及防控重点实验室(北方), 北京 100193
    2 长江大学动物科学技术学院, 湖北荆州 434025
  • 收稿日期:2025-03-09 接受日期:2026-04-07 出版日期:2026-05-16 发布日期:2026-05-20
  • 通信作者:
    沈青春,E-mail:
    熊涛,E-mail:
  • 联系方式: 刘丹,E-mail:1465512558@qq.com。高建帅,E-mail:gaojianshuai2023@163.com。刘丹和高建帅为同等贡献作者。
  • 基金资助:
    国家“十三五”重点研发计划(2017YFF0208601); 中国农业科学院创新工程重点项目(CAAS-CSLPDCP-202403)

Establishment of Fluorescence Quantitative PCR Detection Method for Mycoplasma Contamination in Cells and Virus Live Vaccines

LIU Dan1,2(), GAO JianShuai1(), QIAN JiaHao1, ZHANG BoYuan1, LI HuiTong1,2, DING JiaBo1, XIONG Tao2(), SHEN QingChun1()   

  1. 1 Key Laboratory of Animal Biosafety Risk Prevention and Control (North)/China Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193
    2 College of Animal Science and Technology, Yangtze University, Jingzhou 434025, Hubei
  • Received:2025-03-09 Accepted:2026-04-07 Published:2026-05-16 Online:2026-05-20

摘要:

【背景】在生物学研究和生物制品生产中常受支原体污染困扰,传统检测方法如经典培养法耗时长、灵敏度低,而普通PCR法易受抑制剂干扰且无法定量,难以满足疫苗生产质控及科研试验中对快速精准检测的需求,【目的】通过建立一种覆盖范围广、特异性强、灵敏度高的通用型荧光定量PCR检测方法,为细胞培养物、病毒活疫苗及生物原料中支原体污染提供高效筛查工具。【方法】首先从SILVA数据库下载包含全部细菌、古菌和真菌的16S/18S rRNA参考序列的库文件SILVA_138.1_SSURef,经去冗余处理后筛选出181种/株已分类支原体的16S rRNA全长序列。经过多序列比对确定V6—V8高变区为最佳检测靶点,通过Primer Premier 5.0设计引物及探针,最终筛选出3条引物(正向引物MF1:5′-GCAAARCTATRGARAYATAGYVGAG-3′和MF2:5′-GCAAAGGCTTAGAAATAAGTTCGGAG-3′,反向引物MR:5′-CCARCTCYCATRGTKTGACGG-3′)及1条双淬灭探针(5′-FAM-ACAGRTGGTGCATGGYTGTCGTCAGCTC-BHQ1-3′),通过优化引物探针配比、反应退火温度建立支原体荧光定量PCR检测方法。方法验证包括:(1)引物探针验证:选取与细胞的支原体污染相关的11种支原体/甾原体(如鸭支原体、牛支原体、莱维德氏甾原体等)进行qPCR检测;(2)灵敏性试验:选取3种支原体(鸡毒支原体、鸡滑液囊支原体、猪肺炎支原体),经10倍梯度稀释后进行qPCR检测并绘制标准曲线;(3)特异性试验:选取常见4种细菌(沙门氏菌、产气荚膜梭菌、大肠杆菌、布鲁氏菌)和8种动物细胞(Marc145细胞、Vero细胞、CEF细胞等)进行qPCR检测;(4)重复性试验:取浓度为1.0×108—1.0×101 copies/μL的鸡滑液囊支原体BHQ03株进行组内与组间重复性测试;(5)实际样本试验:对24批(种)动物病毒活疫苗(包括鸡、鸭、猪和犬用活疫苗)、20份8种细胞培养物样本以及8种毒种进行qPCR、普通PCR和经典培养法平行比对,以评价其实际应用效果。【结果】建立的qPCR支原体检测方法使用了3条引物和1条探针,采用两步法扩增程序,退火温度为56 ℃。采用本方法对引起细胞污染最常见的支原体/甾原体种类进行检测,结果均为阳性;特异性试验结果良好,对常见细菌和动物细胞检测结果均为阴性;重复性试验结果显示Ct值变异系数(CV)均小于2%,表明本方法稳定性好;灵敏度试验结果表明本方法检测鸡滑液囊支原体、鸡毒支原体和猪肺炎支原体最低均可检测到1—2 copies/μL;实际样本试验结果表明本研究建立的支原体qPCR检测方法与普通PCR、培养法有很好的一致性,且敏感性更高。【结论】建立的支原体通用qPCR检测方法,为细胞及病毒活疫苗中可能的支原体污染提供了一种准确可靠、且更加快捷的检测手段。

关键词: 支原体, 荧光定量PCR, 生物制品

Abstract:

【Background】Mycoplasma contamination poses a persistent challenge in biological research and biopharmaceutical production. Conventional detection methods, such as classical culture assays, are time-consuming and lack sensitivity, while the standard PCR is prone to inhibitor interference and incapable of quantification, failing to meet the demand for rapid and precise quality control in vaccine production or laboratory settings.【Objective】This study aimed to establish a universal, highly specific, and sensitive quantitative real-time PCR (qPCR) method for efficient screening of mycoplasma contamination in cell cultures, live viral vaccines, and biological raw materials.【Method】The SILVA_138.1_SSURef database, encompassing 16S/18S rRNA sequences of bacteria, archaea, and fungi, was utilized to extract 181 non-redundant 16S rRNA sequences from classified mycoplasma species. The hypervariable V6-V8 region was identified as the optimal target via multiple sequence alignment (MEGA 11.0). Three primers (forward primers MF1: 5′-GCAAARCTATRGARAYATAGYVGAG-3′; MF2: 5′-GCAAAGGCT TAGAAATAAGTTCGGAG-3; reverse primer MR: 5′-CCARCTCYCATRGTKTGACGG-3′) and a dual-quenched TaqMan probe (5′-FAM-ACAGRTGGTGCATGGYTGTCGTCAGCTC-BHQ1-3′) were designed using Primer Premier 5.0, with primer-probe ratios and annealing temperatures optimized to establish the qPCR assay. Validation included: (1) primer-probe specificity testing against 11 Mycoplasma/Acholeplasma species (e.g., Mycoplasma anatis, Mycoplasma bovis, Ureaplasma urealyticum); (2) sensitivity assessment via 10-fold serial dilutions (1.0×108-1.0×101 copies/μL) of Mycoplasma synoviae BHQ03, Mycoplasma gallisepticum, and Mycoplasma hyopneumoniae, with standard curves generated; (3) specificity evaluation against four common bacteria (Salmonella, Clostridium perfringens, Escherichia coli, Brucella) and eight animal cell lines (Marc145, Vero, CEF, etc.); (4) repeatability analysis (intra- and inter-assay variability) using M. synoviae BHQ03 dilutions (1.0×108-1.0×101 copies/μL); (5) parallel testing of 24 live viral vaccine batches (poultry, swine, and canine), 20 cell culture samples (8 types), and 8 viral seed stocks via qPCR, conventional PCR, and classical culture methods.【Result】The optimized qPCR protocol employed a two-step amplification program (56 ℃ annealing temperature). Specificity testing confirmed positive detection of all 11 Mycoplasma/ Acholeplasma strains and no cross-reactivity with non-target bacteria or cell lines. Repeatability tests showed coefficient of variation (CV) values <2% for Ct values across replicates. Sensitivity assays demonstrated limits of detection (LOD) of 1-2 copies/μL for M. synoviae, M. gallisepticum, and M. hyopneumoniae. Comparative analysis of clinical samples revealed high concordance between qPCR, conventional PCR, and culture methods, with qPCR exhibiting superior sensitivity.【Conclusion】The universal qPCR method developed in this study provided an accurate, reliable, and rapid detection tool for potential mycoplasma contamination in cell cultures and live viral vaccines.

Key words: mycoplasma, fluorescence quantitative PCR, biological products