Procedures to recover DNA from pre-molar and molar teeth of decomposed cadavers with different post-mortem intervals.

Abstract:

:A task-force to resolve 26 pending forensic caseworks was carried out. We tested four different protocols to extract DNA from molar and pre-molar teeth from 26 cadavers with post-mortem intervals from 2 months to 12 years. We compared the amount of DNA and DNA profiles with the time elapsed between death and laboratory procedures. Molar or pre-molar teeth were removed from the corpses, cleaned, and DNA was extracted using 2 or 12h of incubation on lysis buffer and filtered using concentration column or precipitated with isopropanol. DNA profiles were obtained using PowerPlex16™ System PCR Amplification Kit, AmpFlSTR(®) Yfiler™ and/or mtDNA sequencing. Complete DNA profiles comparison and statistical evaluation allowed unambiguous identification of the 26 victims. No significant differences were observed in the amount of DNA obtained with the distinct incubation times. The use of concentration column resulted in an increased amount of DNA when compared to isopropanol. However, the lower concentration of DNA obtained with isopropanol seemed to have been compensated by the higher purity. No significant differences in the number of amplified loci were found. A non-significant tendency was found between the amount of total DNA recovered and the time elapsed between death and laboratory procedures. The increase of post-mortem time did not interfere in the analysed autosomal loci. In conclusion, molar and pre-molar teeth were shown to be good candidates to obtain satisfactory DNA profiles, suggesting the high potential of tooth samples as source for DNA typing independently of the decomposed corpse's time or laboratory procedures.

journal_name

Arch Oral Biol

journal_title

Archives of oral biology

authors

Raimann PE,Picanço JB,Silva DS,Albuquerque TC,Paludo FJ,Alho CS

doi

10.1016/j.archoralbio.2012.08.014

subject

Has Abstract

pub_date

2012-11-01 00:00:00

pages

1459-66

issue

11

eissn

0003-9969

issn

1879-1506

pii

S0003-9969(12)00294-4

journal_volume

57

pub_type

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