Immunonephelometry and Reverse Hybrydization Genotyping in Diagnosis of Alpha-1-Antitrypsin Deficiency in Macedonians

BACKGROUND: With a frequency of 1:1600, the alpha-1-antitrypsin deficiency is one of the most frequent hereditary diseases and can be recessively inherited. AAT deficiency is most often caused by inheritance of the so-called PiZ allele. Inheritance of this allele increases the risk of developing chronic obstructive pulmonary diseases (COPD) and liver disease. AIM: The aim of this study was to present immunonephelometry and reverse hybridization genotyping in diagnosis of alpha-1-antitrypsin deficiency in Republic of Macedonia. MATERIAL AND METHODS: At the Institute of Immunobiology and Human Genetics, part of the Faculty of Medicine in Skopje, in the previous 7 years, total of 361 patients with suspected alpha-1-antitrypsin (AAT) deficiency were referred for analysis of AAT concentration using nephelometry (Dade Behring) and subsequent AAT genotyping of individuals with alpha-1-antytripsin deficiency at protein level, based on reverse hybridization technique. RESULTS: Measurement of AAT concentration (g/l) by nephelometry have shown normal level in the range of 1.37-1.41 g/l (88%), lower than normal AAT levels in the range of 0.70-0.83 g/l (8.03%), and concentration above the normal levels in the range of 2.28-2.4 g/l (3.88%). CONCLUSION: Diagnosis in the case of a suspicion of AAT deficiency is carried out by measuring the alpha-1-antitrypsin level in blood and by genotyping of alpha-1-antytripsin allele.