Abstract
A microfabricated electrophoresis device was used for rapid polymerase chain reaction product analysis in genotyping the dopamine D4 receptor gene (DRD4) 48 base pairs repeat polymorphism. An allelic ladder, prepared from homozygous individuals, was used as internal standard during the microchip electrophoresis based analysis. Comparison of this novel separation method with the conventional slab gel and previously reported ultra-thin-layer techniques confirmed the reliability of this new method. Genotyping of 332 healthy Hungarian individuals gave the following allele frequencies: two-repeat: 0.089; three-repeat: 0.026; four-repeat: 0.674; five-repeat: 0.011; six-repeat: 0.002; seven-repeat: 0.189; eight-repeat: 0.011. The genotype frequencies obtained showed no deviation from the Hardy–Weinberg equilibrium ( p>0.903), further underlying the reliability of this new genotyping technique.
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