Human DNA Identification and sex determination from bloodstains using duplex PCR analysis
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Abstract
This study aimed to identify DNA of human origin and determine human sex from bloodstains using duplex PCR analysis. Two pairs of primers amplifying the Amelogenin gene, AMEL(1) and AMEL(2) and a primer pair targeting the Sex Determining Region Y gene [SRY] were compared at the preliminary stage to measure the accuracy of sex determination. The human specific region of the Cytochrome b (Cyt b) gene, sized 412 bp, successfully targeted only human-origin DNA, while other types of animal DNA (dog, cat, cow, chicken and pig) did not produce any PCR product. The SRY primer showed 100% accuracy for male identification with a 197 bp amplicon. Therefore, the SRY primer pair was chosen for sex identification. The optimal annealing temperature for duplex PCR analysis was 55 °C, producing the most distinctive PCR products, determining the male gender with 197 bp and 412 bp bands and female with only 412 bp. For sensitivity, the smallest blood sample that could be detected was 20 ml. For specificity, both human origin and sex determination could be detected in all ratios of mixed human and dog bloods, including 100 fold less human blood to animal blood. Determination of male blood in mixed male and female blood samples was also investigated. The results showed that the presence male blood could be determined in mixed female blood sample at ratios of less than 10 fold. This study demonstrated that duplex PCR analysis of Cyt b and SRY is a reliable tool to investigate human DNA and sex of questioned bloodstains.
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References
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