Am J Hum Genet. 1978 Jul;30(4):359-65.

Alpha1-antitrypsin: further genetic heterogeneity revealed by isoelectric focusing.

Abstract

Alpha1-antitrypsin is a major human serum protein that shows an extensive polymorphism. Genetic heterogeneity has previously been demonstrated by starch gel electrophoresis. By applying analytical isoelectric focusing (pH 3.5--5.0) to this system, we found a common variant, Pi M3, with an isoelectric point between those of Pi M1 and Pi M2. The gene frequency of this variant was .11 in U.S. whites and .054 in blacks. When PiM3 and PiM1 are included in the Pi system, the heterozygosity at the Pi locus is five times greater in whites and 10 times greater in blacks than that detected by earlier electrophoretic techniques.

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PMCID:: PMC1685616

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alpha 1-Antitrypsin

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