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Psoriasis, innate immunity, and gene pools.

¹Department of Dermatology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands. j.d.bos@amc.uva.nl

Journal of the American Academy of Dermatology

|February 24, 2007

Summary

Psoriasis may be linked to increased innate immunity, an evolutionary response to infections in urbanized populations. This genetic shift offers infection protection but raises the risk of immune-related diseases like psoriasis.

Area of Science:

Immunology
Evolutionary Medicine
Dermatology

Background:

Psoriasis pathogenesis research is shifting focus from T cells to innate immunity.
Innate immune responses are demonstrably upregulated in psoriasis lesions.
Psoriasis is understood to have a polygenetic origin.

Purpose of the Study:

To propose a hypothesis for the increased prevalence of psoriasis in urbanized populations.
To explore the evolutionary pressures that may influence immune system responses.
To link genetic polymorphisms associated with innate immunity to disease prevalence.

Main Methods:

Review of current research on psoriasis and immune responses.
Hypothetical modeling of evolutionary selection pressures.

Related Experiment Videos

Comparative analysis of disease prevalence in different populations (urbanized vs. indigenous).

Main Results:

Urbanized populations may have undergone evolutionary selection favoring heightened innate immunity.
Increased innate immunity provides protection against infections but may predispose to autoimmune diseases.
Indigenous populations with lower evolutionary selection pressure exhibit higher infection rates and lower psoriasis prevalence.

Conclusions:

The hypothesis suggests a trade-off between infection resistance and autoimmune disease risk due to evolutionary selection.
Genetic amplification of innate immunity alleles may explain the rise of psoriasis and similar conditions.
Further research is warranted to validate the evolutionary link between innate immunity, urbanization, and autoimmune diseases.