Systems and Synthetic Biology

, Volume 9, Issue 1–2, pp 19–31 | Cite as

Mathematical model of flagella gene expression dynamics in Salmonella enterica serovar typhimurium

  • Kirti Jain
  • Amit Pradhan
  • Chaitanya Mokashi
  • Supreet Saini
Research Article


Flagellar assembly in Salmonella is controlled by an intricate genetic and biochemical network. This network comprises of a number of inter-connected feedback loops, which control the assembly process dynamically. Critical among these are the FliA–FlgM feedback, FliZ-mediated positive feedback, and FliT-mediated negative feedback. In this work, we develop a mathematical model to track the dynamics of flagellar gene expression in Salmonella. Analysis of our model demonstrates that the network is wired to not only control the transition of the cell from a non-flagellated to a flagellated state, but to also control dynamics of gene expression during cell division. Further, we predict that FliZ encoded in the flagellar regulon acts as a critical secretion-dependent molecular link between flagella and Salmonella Pathogenicity Island 1 gene expression. Sensitivity analysis of the model demonstrates that the flagellar regulatory network architecture is extremely robust to mutations.


Flagella Salmonella T3SS Gene regulation 



This work was funded by the Innovative Young Biotechnologist Award (IYBA) 2010 program of the Department of Biotechnology, Ministry of Science and Technology, Government of India.

Supplementary material

11693_2015_9160_MOESM1_ESM.docx (106 kb)
Supplementary material 1 (DOCX 105 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Kirti Jain
    • 1
  • Amit Pradhan
    • 1
  • Chaitanya Mokashi
    • 1
  • Supreet Saini
    • 1
  1. 1.Department of Chemical EngineeringIndian Institute of Technology BombayPowai, MumbaiIndia

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