<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec id="j_jvetres-2023-0013_s_005"><h3>Introduction</h3>
<p><italic>Listeria monocytogenes</italic> (LM) is an important food-borne pathogen, and the risk of its ingestion is a serious public health issue. The better its environmental adaptation mechanisms and pathogenicity are understood, the better the risk it poses can be countered. The regulatory role of the small non-coding RNA (sRNA) <italic>rli106</italic> in the environmental adaptation and pathogenicity of LM is still unclear and this study investigated that role through its biological function.</p></sec>
<sec id="j_jvetres-2023-0013_s_006"><h3>Material and Methods</h3>
<p>An LM-<italic>Δrli106</italic> gene deletion strain and an LM-<italic>Δrli106/rli106</italic> gene complementation strain were constructed using the homologous recombination technique. Then, the adaptation of these strains to temperature, alkalinity, acidity, salinity, ethanol and oxidative stressors, their biofilm-forming ability and their pathogenicity in mice were investigated to show the regulatory roles of sRNA <italic>rli106</italic> in LM. The target gene of <italic>rli106</italic> was also predicted, and the interaction between it and <italic>rli106</italic> was verified by a two-plasmid co-expressing system based on <italic><ext-link ext-link-type="uri" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://E.coli">E.coli</ext-link></italic> and Western blot analysis.</p></sec>
<sec id="j_jvetres-2023-0013_s_007"><h3>Results</h3>
<p>The adaptation of LM-<italic>Δrli106</italic> to environmental stressors of pH 9, 5% NaCl and 8% NaCl, 3.8% ethanol and 5 mM H<sub>2</sub>O<sub>2</sub> was significantly reduced when compared to the parental (LM EGD-e) and complementation strains. Also, the biofilm formation, cell adhesion, invasion, intracellular proliferation and pathogenicity of LM-<italic>Δrli106</italic> in mice were significantly reduced. The results of two-plasmid co-expression and Western blot showed that <italic>rli106</italic> can interact with the mRNA of the predicted <italic>DegU</italic> target gene.</p></sec>
<sec id="j_jvetres-2023-0013_s_008"><h3>Conclusion</h3>
<p>The sRNA <italic>rli106</italic> may positively regulate the expression of the <italic>DegU</italic> gene in LM. This study sheds light on its regulatory roles in environmental adaptation and pathogenicity, providing new insights into the molecular mechanism of sRNA mediation in LM .</p></sec>
</abstract>

Introduction
Listeria monocytogenes (LM) is an important food-borne pathogen, and the risk of its ingestion is a serious public health issue. The better its environmental adaptation mechanisms and pathogenicity are understood, the better the risk it poses can be countered. The regulatory role of the small non-coding RNA (sRNA) rli106 in the environmental adaptation and pathogenicity of LM is still unclear and this study investigated that role through its biological function.
Material and Methods
An LM-Δrli106 gene deletion strain and an LM-Δrli106/rli106 gene complementation strain were constructed using the homologous recombination technique. Then, the adaptation of these strains to temperature, alkalinity, acidity, salinity, ethanol and oxidative stressors, their biofilm-forming ability and their pathogenicity in mice were investigated to show the regulatory roles of sRNA rli106 in LM. The target gene of rli106 was also predicted, and the interaction between it and rli106 was verified by a two-plasmid co-expressing system based on E.coli and Western blot analysis.
Results
The adaptation of LM-Δrli106 to environmental stressors of pH 9, 5% NaCl and 8% NaCl, 3.8% ethanol and 5 mM H2O2 was significantly reduced when compared to the parental (LM EGD-e) and complementation strains. Also, the biofilm formation, cell adhesion, invasion, intracellular proliferation and pathogenicity of LM-Δrli106 in mice were significantly reduced. The results of two-plasmid co-expression and Western blot showed that rli106 can interact with the mRNA of the predicted DegU target gene.
Conclusion
The sRNA rli106 may positively regulate the expression of the DegU gene in LM. This study sheds light on its regulatory roles in environmental adaptation and pathogenicity, providing new insights into the molecular mechanism of sRNA mediation in LM .

The small non-coding RNA <italic>rli106</italic> contributes to the environmental adaptation and pathogenicity of <italic>Listeria monocytogenes</italic>

Journal of Veterinary Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The small non-coding RNA  contributes to the environmental adaptation and pathogenicity of 

Introduction
Listeria monocytogenes (LM) is an important food-borne pathogen, and the risk of its ingestion is a serious public health issue. The better its...

The small non-coding RNA rli106 contributes to the environmental adaptation and pathogenicity of Listeria monocytogenes

Published Online: Mar 17, 2023

Page range: 67 - 77

Received: Apr 01, 2022

Accepted: Mar 03, 2023

DOI: https://doi.org/10.2478/jvetres-2023-0013

Keywords
sRNA, environmental adaptation, pathogenicity, target gene.

© 2023 Y. Guo et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The small non-coding RNA rli106 contributes to the environmental adaptation and pathogenicity of Listeria monocytogenes

Published Online: Mar 17, 2023

Page range: 67 - 77

Received: Apr 01, 2022

Accepted: Mar 03, 2023

DOI: https://doi.org/10.2478/jvetres-2023-0013

KeywordssRNA, environmental adaptation, pathogenicity, target gene.

© 2023 Y. Guo et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
sRNA, environmental adaptation, pathogenicity, target gene.