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. 1987 Mar;79(3):989–996. doi: 10.1172/JCI112911

Unique alpha-spectrin mutant in a kindred with common hereditary elliptocytosis.

P A Lane, R L Shew, T A Iarocci, N Mohandas, T Hays, W C Mentzer
PMCID: PMC424257  PMID: 3818958

Abstract

We report here a unique variant of alpha spectrin in a kindred with hereditary elliptocytosis. This novel red blood cell-membrane protein migrated to a position between the normal alpha- and beta-spectrin subunits in SDS polyacrylamide gel electrophoresis. It was identified as an alpha spectrin by its binding to anti-alpha spectrin antibodies, by the absence of a phosphorylation site, and by the normal 1:1 stoichiometry between total alpha- and beta-spectrin molecules. The quantity of the alpha-spectrin mutant, expressed as a percentage of the total alpha spectrin, varied from 9.9-45.2% among six affected individuals. Two-dimensional electrophoretic analysis of spectrin tryptic digests was qualitatively normal but showed a decreased quantity of a normal alpha IV fragment. The variable quantity of alpha-spectrin mutant among family members correlated directly with the increased percentage of spectrin dimers in cold low ionic strength spectrin extracts (r = 0.92) and inversely with red blood cell ghost mechanical stability (r = -0.98). The data suggest that this new alpha-spectrin mutant is responsible for decreased spectrin dimer-dimer association and for red cell instability in affected individuals.

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