title: Genetic control of quantitative variation in carbonic anhydrase isozymes of mammals. I. The concentration within single erythrocytes of the mouse.
abstract: The levels of the carbonic anhydrase isozymes (CA and CA II) in single erythrocytes of DBA/2J mice were assayed by measuring the specific immunofluorescence of CA I and CA II with a microspectrofluorometric technique. Measurements of 100 randomly selected cells showed a range (in relative fluorescence units) of 21-52 (mean 31.3 +/- 7.5) for CA I and 30-80 (mean 45.6 +/- 10.7) for CA II. The CA II/CA I ratio of the means obtained by the single-cell fluorescence assay was similar to the ratios obtained for the two isozymes from hemolysates of DBA/2J mice using an immunodiffusion assay. The influence of cell age on the variation in carbonic anhydrase levels was determined by separating red cells into several fractions by a gravity sedimentation procedure. The younger cells showed higher levels of CA I and CA II than the older cells; however, the extensive overlap in the variability between the cells from the different fractions indicated that although cell age was contributing to the overall heterogeneity, its influence was not pronounced.
mesh_terms: D000818:Animals; D002256:Carbonic Anhydrases / Q000097:blood / Q000235:genetics*; D004912:Erythrocytes / Q000201:enzymology*; D005455:Fluorescent Antibody Technique; D014644:Genetic Variation; D005779:Immunodiffusion; D007527:Isoenzymes / Q000097:blood / Q000235:genetics*; D051379:Mice; D008815:Mice, Inbred Strains; D012156:Reticulocytes / Q000201:enzymology
chemical_list: D007527:Isoenzymes; D002256:Carbonic Anhydrases