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Hypothesis: a selective advantage for cystic fibrosis heterozygotes
1Department of Anthropology, Kent State University, Ohio 44242.
American Journal of Physical Anthropology
|September 1, 1987
Summary
Cystic Fibrosis (CF) carriers may have been protected against tuberculosis due to increased hyaluronic acid production. This genetic trait might be an evolutionary adaptation to historical TB prevalence in European populations.
Area of Science:
- Evolutionary biology
- Human genetics
- Infectious disease epidemiology
Background:
- European populations exhibit high frequencies of cystic fibrosis (CF) and a long history of pulmonary tuberculosis.
- Cystic Fibrosis is a recessive genetic disorder.
Observation:
- Individuals with CF, while asymptomatic carriers of the CF gene, display excessive hyaluronic acid production in their fibroblasts.
- Hyaluronic acid plays a role in pathogen isolation and may enhance host resistance.
Findings:
- CF heterozygosity is linked to increased resistance against Mycobacterium tuberculosis.
- Excessive hyaluronic acid production by CF carriers appears to be an adaptive trait against tuberculosis.
Implications:
- CF heterozygosity may represent an evolutionary adaptation to historical tuberculosis-dominated environments in Europe.
- Understanding this genetic link could inform future strategies for infectious disease resistance and management.