Abstract
Allelic frequencies of 48 informative insert-delete (INDEL) loci were obtained from a sample set of 130 unrelated individuals living in Macapá, a city located in the northern Amazon region, in Brazil. The values of heterozygosity ( H), polymorphic information content ( PIC), power of discrimination ( PD), power of exclusion ( PE), matching probability ( MP) and typical paternity index ( TPI) were calculated and showed the forensic efficiency of these genetic markers. Based on the allele frequency obtained for the population of Macapá, we estimated an interethnic admixture for the three parental groups (European, Native American and African) of, respectively, 50%, 21% and 29%. Comparing these allele frequencies with those of other Brazilian populations and the parental populations, statistically significant distances were found. The interpopulation genetic distance ( F ST coefficients) to the present database ranged from F ST = 0.0431 ( p < 0.00001) between Macapá and Belém to F ST = 0.266 ( p < 0.00001) between Macapá and the Native American group.
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