Quality evaluation of DNA obtained from stored human saliva and its applicability to identification in Forensic Dentistry

• Autor(a) principal: Carvalho, Suzana Papile Maciel
• Data de Publicação: 2010
• Outros Autores: Sales-Peres, Arsenio, Ribeiro-Bicudo, Lucilene Arilho, da Silva, Ricardo Henrique Alves
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista odonto ciência (Online)
• Texto Completo: https://revistaseletronicas.pucrs.br/ojs/index.php/fo/article/view/5043
• topic: Human identification; Forensic Dentistry; Forensic Medicine; DNA; molecular biology; saliva; Identificação Humana

Purpose: This study evaluated the quality of DNA obtained from stored human saliva and its applicability to human identification. Methods: The saliva samples of 20 subjects, collected in the form of saliva in natura and from mouth swabs and stored at -20ºC, were analyzed. After 7 days, the DNA was extracted from the 40 saliva samples and subjected to PCR and electrophoresis. After 180 days, the technique was repeated with the 20 swab samples. Results: The first-stage results indicated that DNA was successfully extracted in 97.5% of reactions, 95% of saliva in natura and 100% of swab saliva samples, with no statistically significant difference between the forms of saliva. In the second phase, the result was positive for all 20 analyzed samples (100%). Subsequently, in order to analyze the quality of the DNA obtained from human saliva, the SIX3-2 gene was tested on the 20 mouth swab samples, and the PCR products were digested using the MbO1 restriction enzyme to evaluate polymorphisms in the ADRA-2 gene, with positive results for most samples. Conclusion: It was concluded that the quantity and quality of DNA from saliva and the techniques employed are adequate for forensic analysis of DNA.