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Alpha 1-antitrypsin deficiency and the flaccid lung syndrome. The heterozygote controversy
Clinical Genetics
|March 1, 1986
Abstract:
A significantly higher number of PI ZZ and PI MZ individuals was found in a flaccid lung population as compared to internal and healthy controls. The relative risk for ZZ is 12.5 and for MZ 1.8. We conclude that if a PI MZ individual does develop lung disease, the excess risk due to the deficiency is negligible compared to MM individuals and is highly influenced or modified by other factors, possibly including both environmental and genetic.
Insights
Individuals with alpha-1 antitrypsin deficiency (PI ZZ) have a significantly higher risk of lung disease. PI MZ individuals show a negligible excess risk, influenced by other genetic and environmental factors.
Area of Science:
- Pulmonary Medicine
- Genetics
- Epidemiology
Background:
- Alpha-1 antitrypsin deficiency (AATD) is an inherited disorder that can lead to lung disease.
- The study investigates the prevalence and risk associated with different genotypes of AATD in a specific population.
Purpose of the Study:
- To determine the association between alpha-1 antitrypsin (AAT) deficiency genotypes (PI ZZ and PI MZ) and the risk of developing lung disease.
- To compare the risk in individuals with AATD genotypes to healthy and internal controls.
Main Methods:
- Population-based study comparing PI ZZ and PI MZ individuals with controls.
- Calculation of relative risk for ZZ and MZ genotypes.
Main Results:
- A significantly higher number of PI ZZ and PI MZ individuals were identified in the flaccid lung population compared to controls.
- The relative risk for developing lung disease was 12.5 for PI ZZ and 1.8 for PI MZ individuals.
Conclusions:
- The PI ZZ genotype is associated with a substantially increased risk of lung disease.
- For PI MZ individuals who develop lung disease, the risk attributable to AAT deficiency is minimal and heavily modified by other environmental and genetic factors.