食品检测用肠道侵袭性大肠埃希氏菌标准物质的研制
CSTR:
作者:
作者单位:

(中国食品药品检定研究院,北京 100050)

作者简介:

赵琳娜 女 高级工程师 研究方向为食品微生物 E-mail:jade_zhao@126.com

基金项目:

科技部“食品安全关键技术研发”重点专项项目(2018YFC1604303)


Preparation of enteroinvasive Escherichia coli reference materials for food analysis
Author:
Affiliation:

(National Institutes for Food and Drug Control, Beijing 100050, China)

  • 摘要
  • | |
  • 访问统计
  • |
  • 参考文献 [26]
  • |
  • 相似文献
  • |
  • 引证文献
  • | |
  • 文章评论
    摘要:

    目的 为满足肠道侵袭性大肠埃希氏菌(enteroinvasive Escherichia coli, EIEC)准确检测的实验室质量控制和能力验证需求,研制具有我国自主知识产权、稳定性良好且具有清晰基因组信息背景的即用型EIEC标准物质。方法 利用二代高通量测序技术对EIEC(CMCC 44840)进行全基因组测序,明确CMCC 44840的种属、血清型、多位点序列分型(MLST)和毒力基因;采用冷冻干燥技术制备活菌含量为103 CFU的EIEC冻干样品;参照CNAS-GL017-2018进行均匀性检验,并采用单因素方差分析对结果进行统计分析;将样品分别于-20 ℃、4 ℃、25 ℃和37 ℃条件下保藏,对其储藏稳定性和运输性进行评价;利用5种食品基质样本进行标准物质的使用效果验证,同时组织3家实验室进行协同标定。结果 CMCC 44840基因组大小为4.96 Mb,GC含量为50.7%,编码基因5 424个,种属鉴定结果为大肠埃希氏菌,(Escherichia coli)血清预测结果为O28ac:H7,MLST为ST311型,携带ipaH、virB、virF等毒力基因;制备的EIEC冻干样品均匀性检验结果F=1.79,符合标准物质均匀性要求;冻干样品在25 ℃和4 ℃下保藏7 d,-20 ℃和4 ℃下保藏60 d,菌含量均保持在103CFU水平,在37 ℃下第3 d菌含量出现下降,低于103CFU水平;添加EIEC冻干样品的20件不同食品基质样品经增菌后均检出EIEC;3家协同标定实验室测定EIEC冻干样品菌含量均为103 CFU,且实验室间无显著性差异(F=0.59)。结论 本研究所制备的EIEC标准物质所用菌株具有清晰的基因组序列信息,均匀性和稳定性均符合要求,适用性良好,能够满足食品检测实验室的质量控制和能力验证的需求。

    Abstract:

    Objective To satisfy the demands of laboratory quality control and proficiency testing for the detection of enteroinvasive Escherichia coli (EIEC), a stable EIEC reference material was developed with independent intellectual property rights, good stability and clear background genomic information. Methods NGS Technique was used to sequence the whole genome of enteroinvasive Escherichia coli (CMCC 44840), bioinformatics analysis was performed to identify the species, serotype, MLST type and virulence genes; EIEC lyophilized samples with 103 CFU were prepared by freeze-drying method ; The homogeneity test was performed according to CNAS-GL017, and the result were statistically analyzed by one-way ANOVA; The samples were stored at -20,4, 25 and 37 ℃, respectively, and their storage stability and transport stability were evaluated; Five kinds of food matrix samples were used to verify the applicability of reference materials, and three laboratories were organized for collaborative calibration. Results The genome size of CMCC 44840 was 4.96 Mb, the GC content was 50.7%, and the genome contained 5424 coding genes. This strain was identified as the species of Escherichia coli, and the serotype and the MLST type were predicted to be O28ac:H7 and ST311, respectively, and it carried ipaH, virB, virF and other virulence genes. The homogeneity test result of the EIEC lyophilized sample was F=1.79, which met the homogeneity requirements of reference materials. The EIEC samples were still 103 CFU when storing at -20 ℃ and 4 ℃ for 60 d and storing at 25 ℃ and 4 ℃ for 7 d, and decreased on the third day at 37 ℃. EIEC were detected in 20 different food matrix samples with EIEC lyophilized samples after enrichment. The samples were 103 CFU determined by three collaborative calibration laboratories, and there were no significant differences among these laboratories (F=0.59). Conclusion The EIEC reference material prepared in this study has clear genome sequence information. The homogeneity and stability meet the requirements and have good applicability, which can meet the requirements of quality control and capability verification in food testing laboratory.

    参考文献
    [1] KAUR P, CHAKRABORTI A, ASEA A.Enteroaggregative Escherichia coli:an emerging enteric food borne pathogen [J].Interdisciplinary Perspectives on Infectious Diseases, 2010,2010:1-10.
    [2] 徐建国, 阚飙, 张建中.现场细菌学[M].北京:科学出版社, 2011.
    [3] NATARO J P, KAPER J B.Diarrheagenic Escherichia coli [J].Clinical Microbiology Reviews, 1998,11(1):142-201.
    [4] 弓红梅.山西部分地区腹泻病原菌的分布和致泻大肠埃希菌的相关毒力基因研究[D].太原:山西医科大学, 2012.
    [5] 孔海深.致泻大肠埃希氏菌的分子分型和流行病学研究[D].杭州:浙江大学, 2011.
    [6] 夏文, 薛琳, 周显凤, 等.一起由肠侵袭性大肠埃希菌O136∶K78引起的聚集性腹泻暴发[J].疾病监测, 2012,27(9):726-728.
    [7] 杨梦, 熊长辉, 王鹏, 等.一起侵袭性大肠埃希菌食物中毒事件的溯源分析[J].现代预防医学, 2015,42(5):810-813.
    [8] 燕勇, 沈志英, 王恒辉.食物中毒标本中检出一例少见的侵袭性大肠埃希菌O164:K? [J] 中国卫生检验杂志, 2006,16(3):364-365.
    [9] 马金晶, 李凤琴, 白瑶, 等.养猪场源致泻大肠埃希菌毒力基因和致病型研究[J].中国食品卫生杂志, 2021,33(2):127-131.
    [10] 张彩文, 李金霞, 陈怡文, 等.致泻大肠埃希氏菌检验用标准菌株的研究[J].食品与发酵工业, 2020,46(23):68-73.
    [11] SCHUSTER SC.Next-generation sequencing transforms today's biology [J].Nature Methods, 2008,5:16-18.
    [12] MARSHALL D A, MACDONALD K V, ROBINSON J O, et al.The price of whole-genome sequencing may be decreasing, but who will be sequenced? [J].Personalized Medicine, 2017,14 (3):203-211.
    [13] BARLETTA F, OCHOA T J, CLEARY T G.Multiplex realtime PCR ( MRT-PCR ) for diarrheagenic PCR detection of microbial pathogens[J].2016,943:307-314.
    [14] ZHANG J Y, XU Y, LING X, et al.Identification of diarrheagenic Escherichia coli by a new multiplex PCR assay and capillary electrophoresis[J].Molecular and Cellular Probes, 2020,49:101477.
    [15] 黄昭鸿, 黄运红, 黄艳梅, 等.分型检测致泻性大肠埃希氏菌PCR技术研究进展[J].中国生物工程杂志, 2020,40(7):82-90.
    [16] 余晓丰, 杨勇, 占利, 等.食源性致泻大肠杆菌血清型及毒力基因的研究[J].食品工业科技, 2017,38(9):124-127.
    [17] 薛蕾, 隋志伟, 张玲, 等.金黄色葡萄球菌标准物质的研制[J].食品科学, 2015,36(8):44-48.
    [18] 骆海朋, 瞿洪仁, 申静云, 等.阪崎克罗诺杆菌标准物质研制[J].食品安全质量检测学报, 2019,10(1):54-59.
    [19] 瞿洪仁, 骆海朋, 申静云, 等.食品检测用单核细胞增生李斯特氏菌标准物质的研制[J].食品安全质量检测学报, 2019,10(1):65-70.
    [20] 刘思渊, 王梓权, 甄啸啸, 等.用于培养基生长率评价的大肠杆菌标准物质研制[J].中国测试, 2020,46(10):48-53.
    [21] 吴谦, 黄晓蓉, 王晶, 等.鸡肉中单核细胞增生李斯特氏菌标准物质的研制[J].计量学报, 2010,31(z1):9-13.
    [22] 陈彬, 郑晶, 黄晓蓉, 等.乳粉中阪崎肠杆菌标准物质的研制[J].中国乳品工业, 2012,40(12):16-18.
    [23] BERTELLI C, GREUB G.Rapid bacterial genome sequencing:methods and applications in clinical microbiology [J].Clinical Microbiology and Infection, 2013,19(9):803-813.
    [24] Aziz R K, Bartels D, Best A A, et al.The RAST Server:Rapid annotations using subsystems technology[J].BMC Genomics, 2008,9:75.
    [25] CARRICO JA, ROSSI M, MORAN-GILAD J, et al.A primer on microbial bioinformatics for nonbioinformaticians [J].Clin microbiology infec:European Society of Clinical Microbiology and Infectious Diseases, 2018(24):342-349. CARRIO J A, ROSSI M, MORAN-GILAD J, et al.A primer on microbial bioinformatics for nonbioinformaticians[J].Clinical Microbiology and Infection, 2018,24 (4):342-349.
    [26] 沈应博, 史晓敏, 沈建忠, 等.全基因组测序与生物信息学分析在细菌耐药性研究中的应用[J].生物工程学报, 2019,35(4):541-557.
    相似文献
    引证文献
    网友评论
    网友评论
    分享到微博
    发 布
引用本文

赵琳娜,王学硕,刘娜,崔生辉,路勇.食品检测用肠道侵袭性大肠埃希氏菌标准物质的研制[J].中国食品卫生杂志,2021,33(6):807-814.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-09-30
  • 在线发布日期: 2022-01-04
文章二维码
严正声明
关闭