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Influence of Salmonella enterica serovar Pullorum pathogenicity island 2 on type III secretion system effector gene expression in chicken macrophage HD11 cells

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Salmonella pathogenicity island 2 (SPI2) can encode type III secretion system 2 (T3SS2) which plays an important role in systemic disease development through delivering different effector proteins into host cells. Here, the influence of Salmonella Pullorum pathogenicity island 2 on T3SS2 effector gene expression was studied using qRT-PCR in chicken macrophage HD11 cells. Our results showed that all the detected genes (including pseudogenes sifB, sspH2 and steC) can express in HD11 cells of S. Pullorum infection; deletion of SPI2 of S. Pullorum did not significantly affect the expression of genes cigR, gtgA, slrP, sopD, sseK1, steB and steC, but had a significant effect on the expression of genes pipB2, sifB, sopD2, sseJ, sseL, sspH2, steD, sifA, pipB and steA at different degrees. These results suggest that SPI2 can significantly affect the expression of some T3SS2 effector genes. Some effectors may have secretion pathways other than T3SS2 and pseudogenes may play roles in the process of S. Pullorum infection.
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Keywords: Salmonella Pullorum; Salmonella pathogenicity island 2; gene expression; pseudogenes; type III secretion system

Document Type: Research Article

Affiliations: Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, People’s Republic of China

Publication date: March 4, 2017

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