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qPCR揭示的革兰氏阳性菌组氨酸脱羧酶基因的流行情况

Prevalence of Histidine Decarboxylase Genes of Gram-Positive Bacteria in as Revealed by qPCR.

作者信息

Belleggia Luca, Milanović Vesna, Cardinali Federica, Garofalo Cristiana, Clementi Francesca, Aquilanti Lucia, Osimani Andrea

机构信息

Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy.

出版信息

Indian J Microbiol. 2021 Mar;61(1):96-99. doi: 10.1007/s12088-020-00907-1. Epub 2020 Sep 22.

DOI:10.1007/s12088-020-00907-1
PMID:33505099
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7810795/
Abstract

Histamine is a degradation product of the bacterial decarboxylation of the amino acid histidine; such activity is determined by histidine decarboxylase encoded by a gene cluster, carried by some Gram-positive bacteria, that includes the gene. In this study, the presence of the gene in ready-to-eat samples collected from three producers based in Sweden was directly assessed via qPCR analysis for the very first time. Samples from producer A showed average gene abundance of 6.67 ± 0.13 Log cells/gene copies g; in samples from producer B the average value attested at 5.56 ± 0.06 Log cells/gene copies g, whereas for samples of producer C average gene abundance attested at 5.30 ± 0.08 Log cells/gene copies g. ANOVA showed a significantly higher average gene copy number in samples from producer A, whereas no significant differences were seen between average values of gene copy numbers detected in samples from producer B and C. The gene copies detected in the present study could give an estimation of the load of potential histamine-producing bacteria in .

摘要

组胺是氨基酸组氨酸经细菌脱羧作用产生的降解产物；这种活性由一些革兰氏阳性菌携带的一个基因簇所编码的组氨酸脱羧酶决定，该基因簇包括[具体基因名称未给出]基因。在本研究中，首次通过定量聚合酶链反应（qPCR）分析直接评估了从瑞典的三个生产商采集的即食[产品名称未给出]样本中[具体基因名称未给出]基因的存在情况。来自生产商A的样本显示平均基因丰度为6.67±0.13 Log细胞/基因拷贝g；来自生产商B的样本平均值为5.56±0.06 Log细胞/基因拷贝g，而生产商C的样本平均基因丰度为5.30±0.08 Log细胞/基因拷贝g。方差分析显示生产商A的样本中平均[具体基因名称未给出]基因拷贝数显著更高，而生产商B和C的样本中检测到的平均基因拷贝数之间未观察到显著差异。本研究中检测到的[具体基因名称未给出]基因拷贝数可用于估计[产品名称未给出]中潜在产组胺细菌的负荷。