Abstract
We have used multicolor fluorescence in situ hybridization of banded chromosomes to orient Fc gamma RII and clone 1054 on a single early metaphase chromosome band (1q22) representing about 2% of the physical map of chromosome 1 in the Charcot-Marie-Tooth (CMT1B) gene region. These two cloned fragments are on the same partially digested 900-kb MluI fragment detected by pulsed field gel electrophoresis. When applied to data from an earlier study, multicolor in situ hybridization results further refined the CMT1B genetic location from an 18 cM interval to a 6 cM interval and the physical map from 15% of chromosome 1 to 3% of chromosome 1. Occasionally the three Fc gamma RII immunoglobulin receptor genes within the 200-kb region are resolved in individual metaphase chromatids.
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