石家庄市售新鲜金针菇中单核细胞增生李斯特菌的分离鉴定及全基因组测序分析
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作者单位:

1.河北医科大学公共卫生学院,河北 石家庄 050017;2.石家庄海关技术中心,河北 石家庄 050051;3.河北国际旅行卫生保健中心,河北 石家庄 050091;4.河北省环境与人群健康重点实验室, 河北 石家庄 050017

作者简介:

王一诺 女 硕士研究生 研究方向为食源性致病菌的分子生物学检测 E-mail: wangyinuo0618@126.com

通讯作者:

徐向东 女 教授 研究方向为食源性致病菌的分子生物学检测 E-mail: xuxd@hebmu.edu.cn
王建昌 男 正高级兽医师 研究方向为食源性致病菌的分子生物学检测 E-mail: jianchangwang1225@126.com

中图分类号:

R155

基金项目:

河北省省级科技项目(22375504D)


Isolation, identification and whole-genome sequencing analysis of Listeria monocytogenes from fresh enoki mushrooms sold in Shijiazhuang
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Affiliation:

1.School of Public Health, Hebei Medical University, Hebei Shijiazhuang 050017, China;2.Food Microbiology and Animal Quarantine Laboratory, Technology Center of Shijiazhuang Customs, Hebei Shijiazhuang 050051, China;3.Hebei International Travel Health Care Center, Hebei Shijiazhuang 050091, China;4.Hebei Key Laboratory of Environment and Human Health, Hebei Shijiazhuang 050017, China

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    摘要:

    目的 调查石家庄市市售新鲜金针菇中单核细胞增生李斯特菌的污染情况,并分析分离株的基因特性。方法 从49份市售新鲜金针菇样本中分离鉴定了18株单核细胞增生李斯特菌菌株,并对其进行全基因组测序,利用BIGSdb-Lm数据库确定菌株ST型别、克隆群、谱系及血清型,并使用VFDB毒力基因数据库和CARD数据库预测菌株毒力基因和耐药基因的携带情况。结果 在49份市售新鲜金针菇中,共分离出18株单核细胞增生李斯特菌,检出率为36.7%。全基因组测序结果显示,18株分离株均属于单核细胞增生李斯特菌的谱系Ⅱ,其中11株属于ST8型、CC8群、1/2a血清型,7株属于ST9型、CC9群、1/2c血清型。所有分离株均携带LIPI-1毒力岛基因和LIPI-2中的部分基因。Lm02携带介导林克酰胺类抗生素耐药的lnu基因;Lm05携带介导肽抗生素耐药的mprF基因;有15株菌同时携带lnu、mprF基因;此外有7株菌携带介导氟喹诺酮类抗生素耐药的norB基因。结论 石家庄市售新鲜金针菇中存在单核细胞增生李斯特菌污染风险,有必要加强对金针菇产品中单核细胞增生李斯特菌的检测和监管力度,保障消费者健康。

    Abstract:

    Objective To investigate the contamination of Listeria monocytogenesL. monocytogenes) in commercially available fresh enoki mushrooms in Shijiazhuang City, and to analyze the genomic characterization of the strains.Methods A total of 49 samples of commercially available fresh enoki mushrooms were tested and characterized for L. monocytogenes, among which 18 strains of L. monocytogenes were isolated. All isolates were subjected to whole-genome sequencing to determine strain sequence type (ST), clonal complex (CC), lineage, and serogroup, using the BIGSdb-Lm database. The presence of virulence genes and drug resistance genes was predicted using the VFDB virulence gene database and the CARD database.Results Eighteen strains of L. monocytogenes were isolated from 49 samples, with a detection rate of 36.7%. Whole-genome sequencing results showed that all 18 isolated strains belonged to lineage Ⅱ. Among them, 11 strains belonged to ST8, CC8 and serogroup 1/2a, while 7 strains belonged to ST9, CC9, and serotype 1/2c. All isolated strains carried the LIPI-1 virulence island genes and some genes in LIPI-2. Strain Lm02 carried the lnu gene, which mediates resistance to lincosamide antibiotics; strain Lm05 carried the mprF gene, which mediates resistance to peptide antibiotics; 15 strains carried both the lnu and mprF genes; in addition, 7 strains carried the norB gene, which mediates resistance to fluoroquinolone antibiotics.Conclusion There is a risk of L. monocytogenes contamination in fresh enoki mushrooms sold in Shijiazhuang City. It is essential to strengthen the detection and control of L. monocytogenes to ensure consumer health.

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王一诺,魏茂琳,王金凤,姜彦芬,孙晓霞,韩钦,徐向东,王建昌.石家庄市售新鲜金针菇中单核细胞增生李斯特菌的分离鉴定及全基因组测序分析[J].中国食品卫生杂志,2025,37(7):629-636.

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  • 收稿日期:2025-05-20
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  • 在线发布日期: 2025-11-13
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