TY - JOUR
T1 - Excision of an unstable pathogenicity island in salmonella enterica serovar enteritidis is induced during infection of phagocytic cells
AU - Quiroz, Tania S.
AU - Nieto, Pamela A.
AU - Tobar, Hugo E.
AU - Salazar-Echegarai, Francisco J.
AU - Lizana, Rodrigo J.
AU - Quezada, Carolina P.
AU - Santiviago, Carlos A.
AU - Araya, Daniela V.
AU - Riedel, Claudia A.
AU - Kalergis, Alexis M.
AU - Bueno, Susan M.
PY - 2011
Y1 - 2011
N2 - The availability of the complete genome sequence of several Salmonella enterica serovars has revealed the presence of unstable genetic elements in these bacteria, such as pathogenicity islands and prophages. This is the case of Salmonella enterica serovar Enteritidis (S. Enteritidis), a bacterium that causes gastroenteritis in humans and systemic infection in mice. The whole genome sequence analysis for S. Enteritidis unveiled the presence of several genetic regions that are absent in other Salmonella serovars. These regions have been denominated "regions of difference" (ROD). In this study we show that ROD21, one of such regions, behaves as an unstable pathogenicity island. We observed that ROD21 undergoes spontaneous excision by two independent recombination events, either under laboratory growth conditions or during infection of murine cells. Importantly, we also found that one type of excision occurred at higher rates when S. Enteritidis was residing inside murine phagocytic cells. These data suggest that ROD21 is an unstable pathogenicity island, whose frequency of excision depends on the environmental conditions found inside phagocytic cells.
AB - The availability of the complete genome sequence of several Salmonella enterica serovars has revealed the presence of unstable genetic elements in these bacteria, such as pathogenicity islands and prophages. This is the case of Salmonella enterica serovar Enteritidis (S. Enteritidis), a bacterium that causes gastroenteritis in humans and systemic infection in mice. The whole genome sequence analysis for S. Enteritidis unveiled the presence of several genetic regions that are absent in other Salmonella serovars. These regions have been denominated "regions of difference" (ROD). In this study we show that ROD21, one of such regions, behaves as an unstable pathogenicity island. We observed that ROD21 undergoes spontaneous excision by two independent recombination events, either under laboratory growth conditions or during infection of murine cells. Importantly, we also found that one type of excision occurred at higher rates when S. Enteritidis was residing inside murine phagocytic cells. These data suggest that ROD21 is an unstable pathogenicity island, whose frequency of excision depends on the environmental conditions found inside phagocytic cells.
UR - http://www.scopus.com/inward/record.url?scp=80054787804&partnerID=8YFLogxK
U2 - 10.1371/journal.pone.0026031
DO - 10.1371/journal.pone.0026031
M3 - Article
C2 - 22039432
AN - SCOPUS:80054787804
SN - 1932-6203
VL - 6
JO - PLoS ONE
JF - PLoS ONE
IS - 10
M1 - e26031
ER -