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Our previous study demonstrated that\n              <jats:italic>Salmonella<\/jats:italic>\n              Pullorum, highly adapted to chickens, can survive in the egg white and, therefore, be passed to newly hatched chicks. However, the survival strategy of\n              <jats:italic>Salmonella<\/jats:italic>\n              Pullorum in antibacterial conditions remains unknown. The overall transcripts in the egg white showed a large-scale shift compared to LB broth. The expression of common response genes and pathways, such as those involved in iron uptake, biotin biosynthesis, and virulence, was significantly changed, consistent with the other transovarial transmission serovar Enteritidis. Notably, membrane stress response, amino acid metabolism, and carbohydrate metabolism were specifically affected. Additional upregulated functionally relevant genes (JI728_13095, JI728_13100, JI728_17960, JI728_10085, JI728_15605, and\n              <jats:italic>nhaA<\/jats:italic>\n              ) as mutants confirmed the susceptible phenotype. Furthermore,\n              <jats:italic>fim<\/jats:italic>\n              deletion resulted in an increased survival capacity in the egg white, consistent with the downregulated expression. The second-round RNA-Seq analysis of the \u0394\n              <jats:italic>fim<\/jats:italic>\n              mutant in the egg white revealed significantly upregulated genes compared with the wild type in the egg white responsible for energy metabolism located on the\n              <jats:italic>hyc<\/jats:italic>\n              and\n              <jats:italic>hyp<\/jats:italic>\n              operons regulated by FhlA, indicating the \u0394\n              <jats:italic>fim<\/jats:italic>\n              mutant cannot receive enough oxygen and switched to fermentative growth due to its inability to attach to the albumen surface. Together, this study provides a first estimate of the global transcriptional response of\n              <jats:italic>Salmonella<\/jats:italic>\n              Pullorum under antibacterial egg white and highlights the new potential role of\n              <jats:italic>fim<\/jats:italic>\n              deletion in optimizing energy metabolism pathways that may assist vertical transmission.\n            <\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>IMPORTANCE<\/jats:title>\n            <jats:p>\n              Pullorum disease, causing serious embryo death and chick mortality, results in substantial economic losses worldwide due to transovarial transmission. Egg-borne outbreaks are frequently reported in many countries. The present study has filled the knowledge gap regarding how the specific chicken-adapted pathogen\n              <jats:italic>Salmonella<\/jats:italic>\n              Pullorum behaves within the challenging environment of egg white. The deletion of the\n              <jats:italic>fim<\/jats:italic>\n              fimbrial system can increase survival in the albumen, possibly by reprogramming metabolism-related gene products, which reveals a new adaptive strategy of pathogens. Moreover, the comparison, including previous research on\n              <jats:italic>Salmonella<\/jats:italic>\n              Enteritidis, capable of vertical transmission, aims to provide diversified data sets in the field and further help to implement reasonable and effective measures to improve both food safety and animal health.\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1128\/msphere.00362-24","type":"journal-article","created":{"date-parts":[[2024,6,11]],"date-time":"2024-06-11T13:29:29Z","timestamp":1718112569000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":19,"title":["Integrated OMICs approach reveals energy metabolism pathway is vital for\n            <i>Salmonella<\/i>\n            Pullorum survival within the egg white"],"prefix":"10.1128","volume":"9","author":[{"given":"Xiamei","family":"Kang","sequence":"first","affiliation":[{"name":"Department of Veterinary Medicine, Zhejiang University College of Animal Sciences, Hangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongli","family":"An","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, Zhejiang University College of Animal Sciences, Hangzhou, China"},{"name":"Hainan Institute of Zhejiang University, Sanya, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5283-7337","authenticated-orcid":false,"given":"Baikui","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, Zhejiang University College of Animal Sciences, Hangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linlin","family":"Huang","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, Zhejiang University College of Animal Sciences, Hangzhou, 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