Alpha-1 antitrypsin deficiency
SNPs associated with reduced levels of the enzyme alpha-1 antitrypsin (encoded by the SERPINA1 gene):
Depending on the genetic variant, alpha-1 antitrypsin deficiency can lead to chronic obstructive pulmonary disease (COPD) or emphysema and can cause liver disease. Smokers who carry particular variants are especially susceptible. The SNP with the most severe effects is most common among people with Scandinavian ancestry, according to a report from [23andMe].