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The mystery of the mystery of common genetic diseases

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Abstract

Common monogenic genetic diseases, ones that have unexpectedly high frequencies in certain populations, have attracted a great number of conflicting evolutionary explanations. This paper will attempt to explain the mystery of why two particularly extensively studied common genetic diseases, Tay Sachs disease and cystic fibrosis, remain evolutionary mysteries despite decades of research. I review the most commonly cited evolutionary processes used to explain common genetic diseases: reproductive compensation, random genetic drift (in the context of founder effect), and especially heterozygote advantage. The latter process has drawn a particularly large amount of attention, having so successfully explained the elevated frequency of sickle cell anemia in malaria-endemic areas. However, the empirical evidence for heterozygote advantage in other common genetic diseases is quite weak. I introduce and illustrate the significance of a hierarchy of genetic disease phenomena found within the genetic disease explanations, which include the phenomena: single mutation variants of a common genetic disease, single genetic diseases, and classes of diseases with related phenotypic effects. I demonstrate that some of the confusion over the explanations of common genetic diseases can be traced back to confusions over which phenomena are being explained. I proceed to briefly evaluate the existing evidence for two common human genetic diseases: Tay Sachs disease and cystic fibrosis. The above considerations will ultimately shed light on why these diseases’ evolutionary explanations remain so deeply unresolved after so such a great volume of research.

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Notes

  1. Founder effect is properly a subcategory of bottleneck effects, which can occur at times other than the founding of the population, with similar consequences.

  2. However, the use of a deterministic model has the effect of discounting drift as a mere matter of basic model structure choice.

  3. This process can also extend beyond 1:1 replacement, becoming “reproductive over-compensation”, wherein sibships in disease-affected families are actually larger than the population’s average (Koeslag, et al. 1984).

  4. An exception to this general tendency of biochemical linkages is a recent paper by Poolman and Galvani (2007). The paper uses epidemiological models to argue that TB is a viable candidate HA selective agent for CF. Regrettably, a dearth of TB data for non-European areas limits the paper’s ability to account for CF’s Europe-centered increase in frequency.

  5. This research could be either prospective or retrospective is design, so long as fitness is accurately ascertained. Of course, ethical considerations would set serious constraints on any prospective study design.

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Acknowledgments

I am deeply grateful for the many helpful suggestions offered by the Indiana University Biology Studies Reading Group. I would like to especially thank Elisabeth Lloyd for her paramount patience and wisdom throughout the writing and revising of the paper, as well as Michael Wade for his detailed and insightful advice on both the biology and the philosophy. I am also very grateful for the invaluable comments and suggestions provided by Kim Sterelny and an anonymous reviewer.

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Correspondence to Sean A. Valles.

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Valles, S.A. The mystery of the mystery of common genetic diseases. Biol Philos 25, 183–201 (2010). https://doi.org/10.1007/s10539-009-9184-8

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