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Beaumont, C. et al.

Beaumont, Protais, Pitel, Leveque, Malo, Lantier, Plisson-Petit, Colin, Protais, Le Roy, Elsen, Milan, Lantier, Neau, Salvat, Vignal,

Effect of two candidate genes on the Salmonella carrier state in fowl.

Selection for increased resistance to Salmonella carrier-state (defined as the persistency of the bacteria 4 wk after inoculation) could reduce the risk for the consumer of food toxi-infections. The effects of two genomic regions on chromosomes 7 and 17 harboring two genes, NRAMP1 (SLC11A1) and TLR4, known to be involved in the level of chicken infection 3 d after inoculation by Salmonella were thus tested on a total of 331 hens orally inoculated at the peak of lay with 10(9) bacteria. The animals and their parents were genotyped for a total of 10 microsatellite markers mapped on chromosomes 7 and 17. Using maximum likelihood analysis and interval mapping, it was found that the SLC11A1 region was significantly involved in the control of the probability of spleen contamination 4 wk after inoculation. Single nucleotide polymorphisms (SNP) within the SLC11A1 and TLR4 gene were tested on those animals as well as on a second batch of 279 hens whose resistance was assessed in the same conditions. As the former was significantly associated with the risk of spleen contamination and the number of contaminated organs, SLC11A1 appears to be involved in the control of resistance to Salmonella carrier state. The involvement of the TLR4 gene was also highly suspected as a significant association between SNP within the gene, and the number of contaminated organs was detected.[1]

References

Effect of two candidate genes on the Salmonella carrier state in fowl. Beaumont, C., Protais, J., Pitel, F., Leveque, G., Malo, D., Lantier, F., Plisson-Petit, F., Colin, P., Protais, M., Le Roy, P., Elsen, J.M., Milan, D., Lantier, I., Neau, A., Salvat, G., Vignal, A. Poult. Sci. (2003) [Pubmed]

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