Complexity in the Immune System

Details Complexity in the Immune System Complexity in the Immune System

2003-10-15

arxiv.org/abs/q-bio/0310019v1

Biology

Quantitative Biology

Cell Behavior

25 pages, 12 figures

Scientific paper

The immune system is a real-time example of an evolving system that navigates the essentially infinite complexity of protein sequence space. How this system responds to disease and vaccination is discussed. Of particular focus is the case when vaccination leads to increased susceptibility to disease, a phenomenon termed original antigenic sin. A physical theory of protein evolution to explain limitations in the immune system response to vaccination and disease is discussed, and original antigenic sin is explained as stemming from localization of the immune system response in antibody sequence space. This localization is a result of the roughness in sequence space of the evolved antibody affinity constant for antigen and is observed for diseases with high year-to-year mutation rates, such as influenza.

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