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Master's Dissertation
DOI
10.11606/D.23.2004.tde-21062005-073816
Document
Author
Full name
Vanessa Rosalia Remualdo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2004
Supervisor
Committee
Oliveira, Rogerio Nogueira de (President)
Daruge Júnior, Eduardo
Hirata, Mario Hiroyuki
Title in Portuguese
"Avaliação de três métodos de extração de DNA de dentes humanos submetidos ao calor"
Keywords in Portuguese
DNA
DNA mitocondrial
Identificação humana
Odontologia legal
Abstract in Portuguese
Nos casos de carbonização humana usualmente há uma limitação do emprego dos remanescentes biológicos para estudo. Nestes casos, têm-se usado por eleição dentes para análises forenses, já que sua constituição anatômica proporciona proteção ao material genético. No presente estudo avaliou-se a amplificação por PCR do DNA obtido de dentes submetidos ao calor (200°C, 400°C, 500°C e 600°C) durante 60 minutos testando-se três métodos de extração (orgânico, acetato de amônia/isopropanol e sílica). Foram utilizados 8 pares de dentes de indivíduos diferentes, sendo que um foi mantido in natura (gold standart) e o outro submetido à queima. Para amplificação do DNA empregaram-se iniciadores de DNA genômico (STR-F13A01) e DNA mitocondrial (MPSs). Para o DNA genômico, a análise em gel de poliacrilamida permitiu verificar que com o método orgânico 50% das amostras foram amplificadas, 38% com o acetato de amônia/isopropanol, e 0% com a sílica. Para os MPSs, o seqüenciamento das amostras mostrou que o método orgânico confirmou 100% dos resultados em 200ºC, 50% em 400ºC e 0% em 500ºC e 600ºC. Para o método acetato de amônia/isopropanol em 100% das temperaturas foi possível a análise do mtDNA. Para o método da sílica, obtivemos resultados de 50% em 400°C e 500°C, e 0% em 200°C e 600°C. Nossos resultados permitem concluir que o método acetato de 8 amônia/isopropanol é o mais indicado para obtenção de DNA amplificável por PCR de amostras carbonizadas nas temperaturas utilizadas neste trabalho.
Title in English
DNA extraction of human teeth submitted to high temperatures: evaluation of three methods .
Keywords in English
DNA
Forensic dentistry
Human identification
mitochondrial
Abstract in English
Biological remains of carbonized human bodies are usually not possible to use in forensic analysis. In these cases, teeth are usually selected since enamel, dentin and cement provides protection to the genetic material. The present study evaluates DNA extracted using three methods (organic, isopropilic alcohol and silica) of teeth submitted to different temperatures (200°C, 400°C, 500°C and 600°C). The method of evaluation was amplification by PCR. Two third molars of eight different individuals were used; one was kept in natura (gold standart) and the other submitted to burning. For amplification primers for genomic (STR-F13A01) and mitochondrial (MPSs) DNA were used. For genomic DNA, polyacrylamide gel analysis showed that 50% of the samples extracted with organic method were amplified, 38% with isopropilic alcohol, and 0% with the silica method. For mitochondrial DNA, amplicons sequencing showed that 100% of the samples extracted with isopropilic alcohol method were confirmed in all temperatures; 100% with the organic method in 200°C, 50% in 400°C, and 0% in 500°C and 600°C. For silica method, 50% in 400°C and 500°C and 0% in 200°C and 600°C. Our results show that the isopropilic alcohol method is the best method to extract DNA from burned teeth of all used temperatures.
 
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Publishing Date
2005-07-15
 
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