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Comparative Sensitivities of Electrophoretic for Human Enzymes

For a number of years, somatic cell hybrids and gel electrophoresis have been used in combination to map genes to chromosomes (McKusick and Ruddle, 1977). H u m a n cells are fused with rodent cells, grown for a number of generations, and examined for a correlation between the segregation of human chromosomes and the gene function being mapped. Two methods are used to determine which human chromosomes have been retained and which have been segregated. Either the chromosomes are stained and identified by their distinctive banding patterns, or the cells are grown up to larger numbers, harvested, and examined for the isozyme markers whose structural genes have been mapped to specific chromosomes. Routinely, both techniques are employed and the data are combined to give a complete karyotypic picture of the cell line being examined. It is essential that this information be correct if the cell line is to be used to correlate the presence or absence of an unmapped marker with the presence or absence of a specific chromosome. If a human chromosome is identified in all of the cells analyzed (routinely 20-30 cells are karyotyped for each cell line) and the isozyme marker whose