Identification and transcriptional profile of Lactobacillus paracasei genes involved in the response to desiccation and rehydration.
Identifieur interne : 000601 ( Main/Exploration ); précédent : 000600; suivant : 000602Identification and transcriptional profile of Lactobacillus paracasei genes involved in the response to desiccation and rehydration.
Auteurs : Aurore Palud [France] ; Karima Salem [Tunisie] ; Jean-François Cavin [France] ; Laurent Beney [France] ; Hélène Licandro [France]Source :
- Food microbiology [ 1095-9998 ] ; 2020.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical : Water.
- genetics : Lactobacillus paracasei.
- physiology : Lactobacillus paracasei.
- Adaptation, Physiological, Desiccation, Down-Regulation, Fluid Therapy, Gene Expression Profiling, Up-Regulation.
Abstract
Lactobacillus paracasei is able to persist in a variety of natural and technological environments despite physico-chemical perturbations, in particular alternations between desiccation and rehydration. However, the way in which it adapts to hydric fluctuations and the genetic determinants involved are not clearly understood. To identify the genes involved in adaptation to desiccation, an annotated library of L. paracasei random transposon mutants was screened for viability after desiccation (25% relative humidity, 25 °C). We found 16 genes that have not been described as being involved in this response. Most of them are linked to either the transport of molecules or to cell wall structure and function. Our screening also identified genes encoding DNA related enzymes and an alarmone necessary for L. paracasei survival. Subsequently, the expression of the identified genes was measured at five stages of the dehydration-rehydration process to decipher the chronology of genetic mechanisms. They were classified into four different transcriptional profiles: genes upregulated during both desiccation and rehydration phases, genes upregulated during the desiccation phase only, genes downregulated during both desiccation and rehydration and genes downregulated only during the rehydration stage. Thus, genetic response to hydric fluctuations seems to occur during desiccation and can continue or not during rehydration. The genes identified should contribute to improve the stabilization of Lactobacillus starters in dry state.
DOI: 10.1016/j.fm.2019.103301
PubMed: 31500710
Affiliations:
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Electronic address: palud.aurore@gmail.com.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Université de Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102, Dijon</wicri:regionArea><placeName><region type="region">Bourgogne-Franche-Comté</region><region type="old region">Bourgogne</region><settlement type="city">Dijon</settlement></placeName></affiliation></author><author><name sortKey="Salem, Karima" sort="Salem, Karima" uniqKey="Salem K" first="Karima" last="Salem">Karima Salem</name><affiliation wicri:level="1"><nlm:affiliation>Université de Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102, Dijon, France; Ecole Polytechnique de Sousse, Sousse, Tunisia.</nlm:affiliation><country xml:lang="fr">Tunisie</country><wicri:regionArea>Université de Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102, Dijon, France; Ecole Polytechnique de Sousse, Sousse</wicri:regionArea><wicri:noRegion>Sousse</wicri:noRegion></affiliation></author><author><name sortKey="Cavin, Jean Francois" sort="Cavin, Jean Francois" uniqKey="Cavin J" first="Jean-François" last="Cavin">Jean-François Cavin</name><affiliation wicri:level="3"><nlm:affiliation>Université de Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102, Dijon, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Université de Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102, Dijon</wicri:regionArea><placeName><region type="region">Bourgogne-Franche-Comté</region><region type="old region">Bourgogne</region><settlement type="city">Dijon</settlement></placeName></affiliation></author><author><name sortKey="Beney, Laurent" sort="Beney, Laurent" uniqKey="Beney L" first="Laurent" last="Beney">Laurent Beney</name><affiliation wicri:level="3"><nlm:affiliation>Université de Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102, Dijon, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Université de Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102, Dijon</wicri:regionArea><placeName><region type="region">Bourgogne-Franche-Comté</region><region type="old region">Bourgogne</region><settlement type="city">Dijon</settlement></placeName></affiliation></author><author><name sortKey="Licandro, Helene" sort="Licandro, Helene" uniqKey="Licandro H" first="Hélène" last="Licandro">Hélène Licandro</name><affiliation wicri:level="3"><nlm:affiliation>Université de Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102, Dijon, France. 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However, the way in which it adapts to hydric fluctuations and the genetic determinants involved are not clearly understood. To identify the genes involved in adaptation to desiccation, an annotated library of L. paracasei random transposon mutants was screened for viability after desiccation (25% relative humidity, 25 °C). We found 16 genes that have not been described as being involved in this response. Most of them are linked to either the transport of molecules or to cell wall structure and function. Our screening also identified genes encoding DNA related enzymes and an alarmone necessary for L. paracasei survival. Subsequently, the expression of the identified genes was measured at five stages of the dehydration-rehydration process to decipher the chronology of genetic mechanisms. They were classified into four different transcriptional profiles: genes upregulated during both desiccation and rehydration phases, genes upregulated during the desiccation phase only, genes downregulated during both desiccation and rehydration and genes downregulated only during the rehydration stage. Thus, genetic response to hydric fluctuations seems to occur during desiccation and can continue or not during rehydration. The genes identified should contribute to improve the stabilization of Lactobacillus starters in dry state.</div></front></TEI><affiliations><list><country><li>France</li><li>Tunisie</li></country><region><li>Bourgogne</li><li>Bourgogne-Franche-Comté</li></region><settlement><li>Dijon</li></settlement></list><tree><country name="France"><region name="Bourgogne-Franche-Comté"><name sortKey="Palud, Aurore" sort="Palud, Aurore" uniqKey="Palud A" first="Aurore" last="Palud">Aurore Palud</name></region><name sortKey="Beney, Laurent" sort="Beney, Laurent" uniqKey="Beney L" first="Laurent" last="Beney">Laurent Beney</name><name sortKey="Cavin, Jean Francois" sort="Cavin, Jean Francois" uniqKey="Cavin J" first="Jean-François" last="Cavin">Jean-François Cavin</name><name sortKey="Licandro, Helene" sort="Licandro, Helene" uniqKey="Licandro H" first="Hélène" last="Licandro">Hélène Licandro</name></country><country name="Tunisie"><noRegion><name sortKey="Salem, Karima" sort="Salem, Karima" uniqKey="Salem K" first="Karima" last="Salem">Karima Salem</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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