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Alpha 1-antitrypsin phenotypes in patients with abdominal aortic aneurysms
J R Cohen1, I Sarfati, L Ratner
1Department of Surgery, Long Island Jewish Medical Center, New Hyde Park, New York 11042.
The Journal of Surgical Research
|October 1, 1990
Summary
The alpha-1-antitrypsin MZ phenotype was more common in patients with abdominal aortic aneurysms, suggesting a genetic link. This finding supports autosomal-dominant or multifactorial inheritance patterns for aortic aneurysms.
Area of Science:
- Genetics
- Vascular Biology
- Biochemistry
Background:
- Abdominal aortic aneurysms (AAAs) are a significant cause of mortality.
- The genetic factors contributing to AAA development are not fully understood.
- Alpha-1-antitrypsin (AAT) is a key proteinase inhibitor with known genetic variations.
Purpose of the Study:
- To investigate the distribution of alpha-1-antitrypsin (AAT) phenotypes in patients with abdominal aortic aneurysms (AAAs).
- To explore potential genetic associations between AAT phenotypes and AAA prevalence.
Main Methods:
- Phenotyping of alpha-1-antitrypsin (AAT) was performed on a cohort of 47 patients diagnosed with abdominal aortic aneurysms.
- Genotyping focused on identifying common AAT phenotypes: MM, MS, MZ, and ZZ.
Main Results:
- The MM phenotype was observed in 85% of patients.
- The MS phenotype was present in 4% of patients.
- The MZ phenotype occurred significantly more frequently in AAA patients (11%) compared to expected population frequencies, suggesting a potential genetic predisposition.
- No ZZ phenotypes were detected in the study cohort.
Conclusions:
- The increased prevalence of the alpha-1-antitrypsin MZ phenotype in patients with abdominal aortic aneurysms suggests a genetic influence.
- These findings support either autosomal-dominant or multifactorial genetic mechanisms in the etiology of AAAs.
- An X-linked inheritance pattern is unlikely based on the current data.