Identification of immunogenic Salmonella enterica serotype Typhi antigens expressed in chronic biliary carriers of S. Typhi in Kathmandu, Nepal.
BACKGROUND:Salmonella enterica serotype Typhi can colonize and persist in the biliary tract of infected individuals, resulting in a state of asymptomatic chronic carriage. Chronic carriers may act as persistent reservoirs of infection within a community and may introduce infection to susceptible ind...
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doaj-276a804b6980455abc189ecddee154662020-11-24T21:35:42ZengPublic Library of Science (PLoS)PLoS Neglected Tropical Diseases1935-27271935-27352013-01-0178e233510.1371/journal.pntd.0002335Identification of immunogenic Salmonella enterica serotype Typhi antigens expressed in chronic biliary carriers of S. Typhi in Kathmandu, Nepal.Richelle C CharlesTania SultanaMohammad Murshid AlamYanan YuYing Wu-FreemanMeagan Kelly BufanoSean M RollinsLillian TsaiJason B HarrisRegina C LaRocqueDaniel T LeungW Abdullah BrooksTran Vu Thieu NgaSabina DongolBuddha BasnyatStephen B CalderwoodJeremy FarrarFarhana KhanamJohn S GunnFirdausi QadriStephen BakerEdward T RyanBACKGROUND:Salmonella enterica serotype Typhi can colonize and persist in the biliary tract of infected individuals, resulting in a state of asymptomatic chronic carriage. Chronic carriers may act as persistent reservoirs of infection within a community and may introduce infection to susceptible individuals and new communities. Little is known about the interaction between the host and pathogen in the biliary tract of chronic carriers, and there is currently no reliable diagnostic assay to identify asymptomatic S. Typhi carriage. METHODOLOGY/PRINCIPAL FINDINGS:To study host-pathogen interactions in the biliary tract during S. Typhi carriage, we applied an immunoscreening technique called in vivo-induced antigen technology (IVIAT), to identify potential biomarkers unique to carriers. IVIAT identifies humorally immunogenic bacterial antigens expressed uniquely in the in vivo environment, and we hypothesized that S. Typhi surviving in the biliary tract of humans may express a distinct antigenic profile. Thirteen S. Typhi antigens that were immunoreactive in carriers, but not in healthy individuals from a typhoid endemic area, were identified. The identified antigens included a number of putative membrane proteins, lipoproteins, and hemolysin-related proteins. YncE (STY1479), an uncharacterized protein with an ATP-binding motif, gave prominent responses in our screen. The response to YncE in patients whose biliary tract contained S. Typhi was compared to responses in patients whose biliary tract did not contain S. Typhi, patients with acute typhoid fever, and healthy controls residing in a typhoid endemic area. Seven of 10 (70%) chronic carriers, 0 of 8 bile culture-negative controls (0%), 0 of 8 healthy Bangladeshis (0%), and 1 of 8 (12.5%) Bangladeshis with acute typhoid fever had detectable anti-YncE IgG in blood. IgA responses were also present. CONCLUSIONS/SIGNIFICANCE:Further evaluation of YncE and other antigens identified by IVIAT could lead to the development of improved diagnostic assays to identify asymptomatic S. Typhi carriers.http://europepmc.org/articles/PMC3731212?pdf=render |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Richelle C Charles Tania Sultana Mohammad Murshid Alam Yanan Yu Ying Wu-Freeman Meagan Kelly Bufano Sean M Rollins Lillian Tsai Jason B Harris Regina C LaRocque Daniel T Leung W Abdullah Brooks Tran Vu Thieu Nga Sabina Dongol Buddha Basnyat Stephen B Calderwood Jeremy Farrar Farhana Khanam John S Gunn Firdausi Qadri Stephen Baker Edward T Ryan |
spellingShingle |
Richelle C Charles Tania Sultana Mohammad Murshid Alam Yanan Yu Ying Wu-Freeman Meagan Kelly Bufano Sean M Rollins Lillian Tsai Jason B Harris Regina C LaRocque Daniel T Leung W Abdullah Brooks Tran Vu Thieu Nga Sabina Dongol Buddha Basnyat Stephen B Calderwood Jeremy Farrar Farhana Khanam John S Gunn Firdausi Qadri Stephen Baker Edward T Ryan Identification of immunogenic Salmonella enterica serotype Typhi antigens expressed in chronic biliary carriers of S. Typhi in Kathmandu, Nepal. PLoS Neglected Tropical Diseases |
author_facet |
Richelle C Charles Tania Sultana Mohammad Murshid Alam Yanan Yu Ying Wu-Freeman Meagan Kelly Bufano Sean M Rollins Lillian Tsai Jason B Harris Regina C LaRocque Daniel T Leung W Abdullah Brooks Tran Vu Thieu Nga Sabina Dongol Buddha Basnyat Stephen B Calderwood Jeremy Farrar Farhana Khanam John S Gunn Firdausi Qadri Stephen Baker Edward T Ryan |
author_sort |
Richelle C Charles |
title |
Identification of immunogenic Salmonella enterica serotype Typhi antigens expressed in chronic biliary carriers of S. Typhi in Kathmandu, Nepal. |
title_short |
Identification of immunogenic Salmonella enterica serotype Typhi antigens expressed in chronic biliary carriers of S. Typhi in Kathmandu, Nepal. |
title_full |
Identification of immunogenic Salmonella enterica serotype Typhi antigens expressed in chronic biliary carriers of S. Typhi in Kathmandu, Nepal. |
title_fullStr |
Identification of immunogenic Salmonella enterica serotype Typhi antigens expressed in chronic biliary carriers of S. Typhi in Kathmandu, Nepal. |
title_full_unstemmed |
Identification of immunogenic Salmonella enterica serotype Typhi antigens expressed in chronic biliary carriers of S. Typhi in Kathmandu, Nepal. |
title_sort |
identification of immunogenic salmonella enterica serotype typhi antigens expressed in chronic biliary carriers of s. typhi in kathmandu, nepal. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS Neglected Tropical Diseases |
issn |
1935-2727 1935-2735 |
publishDate |
2013-01-01 |
description |
BACKGROUND:Salmonella enterica serotype Typhi can colonize and persist in the biliary tract of infected individuals, resulting in a state of asymptomatic chronic carriage. Chronic carriers may act as persistent reservoirs of infection within a community and may introduce infection to susceptible individuals and new communities. Little is known about the interaction between the host and pathogen in the biliary tract of chronic carriers, and there is currently no reliable diagnostic assay to identify asymptomatic S. Typhi carriage. METHODOLOGY/PRINCIPAL FINDINGS:To study host-pathogen interactions in the biliary tract during S. Typhi carriage, we applied an immunoscreening technique called in vivo-induced antigen technology (IVIAT), to identify potential biomarkers unique to carriers. IVIAT identifies humorally immunogenic bacterial antigens expressed uniquely in the in vivo environment, and we hypothesized that S. Typhi surviving in the biliary tract of humans may express a distinct antigenic profile. Thirteen S. Typhi antigens that were immunoreactive in carriers, but not in healthy individuals from a typhoid endemic area, were identified. The identified antigens included a number of putative membrane proteins, lipoproteins, and hemolysin-related proteins. YncE (STY1479), an uncharacterized protein with an ATP-binding motif, gave prominent responses in our screen. The response to YncE in patients whose biliary tract contained S. Typhi was compared to responses in patients whose biliary tract did not contain S. Typhi, patients with acute typhoid fever, and healthy controls residing in a typhoid endemic area. Seven of 10 (70%) chronic carriers, 0 of 8 bile culture-negative controls (0%), 0 of 8 healthy Bangladeshis (0%), and 1 of 8 (12.5%) Bangladeshis with acute typhoid fever had detectable anti-YncE IgG in blood. IgA responses were also present. CONCLUSIONS/SIGNIFICANCE:Further evaluation of YncE and other antigens identified by IVIAT could lead to the development of improved diagnostic assays to identify asymptomatic S. Typhi carriers. |
url |
http://europepmc.org/articles/PMC3731212?pdf=render |
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