Genotyping Methods to Analyse Polymorphisms in Toll-Like Receptors and Disease

  • Chiea-Chuen KhorEmail author
Part of the Methods in Molecular Biology™ book series (MIMB, volume 517)


It is now well accepted that a significant genetic component governs host susceptibility to different infectious diseases. As the Toll-like receptors (TLRs), together with their co-receptors and their downstream signalling partners, play such a crucial role in pathogen recognition and subsequent activation of the host immune response, any genetic mutation (polymorphism) that alters the protein structure and in so doing affects the ability of the TLRs or their co-receptors to bind to their associated pathogen-associated molecular patterns (PAMPs) will likely affect host susceptibility towards infection. Examination of the TLR signalling cascade suggests the existence of several bottlenecks or rate-limiting steps, obvious ones being at the level of the receptors, the adaptor proteins, TNF receptor-associated factor 6 (TRAF6), as well as at the IκB/NF-κB interaction point. Mutations to these downstream members might confer either resistance or increased susceptibility, depending on their nature. Indeed, it has been demonstrated time and again that natural variation in some of the molecules mentioned above does affect differential susceptibility to infectious diseases (e.g. invasive bacterial infections, tuberculosis, and malaria) specific to the binding spectrum of the TLRs involved.

Key words

Toll-like receptors Adaptor protein Genetic Polymorphism Infectious disease 



The author would like to thank Adrian Hill, Luke O’Neill, Stephen Chapman, and Fredrik Vannberg for their helpful suggestions, encouragement, and support.


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Copyright information

© Humana Press, a part of Springer Science + Business Media, LLC 2009

Authors and Affiliations

  1. 1.Section for Genetic Medicine, Brenner Centre for Molecular MedicineSingapore Institute for Clinical SciencesSingaporeSingapore

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