Frequency distribution of human platelet antigens in the Indian population.

This study was undertaken with an aim of establishing the frequency distribution of various human platelet antigens (HPA) in Indian populations by means of DNA-based technology. A total of 1164 people belonging to various population groups were studied for the frequency distribution of HPA. DNA extraction was performed from peripheral venous blood samples. Polymerase chain reaction allele-specific amplification technique was used for HPA genotyping. The HPA bands were visualized by using ethidium bromide-stained agarose gel, after electrophoresis. The homozygosity of the HPA-1b/1b genotype was found to be significantly higher (P < 0.05) in the Parsi population group and Vatalia Prajapati population group, compared to Maharashtrians. Frequency distribution of HPA-1b in our populations was found to be slightly lower than that reported in some western populations. This study has established a DNA technique to diagnose cases of NAITP definitively and to treat these cases during the neonatal period, and also gives the frequency distribution of HPA in some of the Indian population.