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Molecular characterisation of the nucleic acids recovered from aged forensic samples.

Abstract：

:The molecular composition of the genetic substrate recovered from seven aged forensic samples has been extensively investigated. A simple enzymatic test based on DNAseI incubation of the extracts showed that the UV-fluorescent material from the forensic specimens is composed of nucleic acids, with the DNA fraction representing at least 90% of the total amount. Since spectrophotometric determinations of the extracts showed unreliable results due to anomalous OD(260)/OD(280) ratios, quantification of the nuclease-sensitive genetic material was performed by a slightly modified agarose plate method. The first quantitative data on exogenous contamination in aged forensic samples are provided by slot-blot hybridisation of the extracts to human, bacterial and fungal probes. Only limited amounts of human and contaminant DNA were detected in the samples. The molecular integrity of the primary structure of these aged DNA samples was analysed by reversed-phase HPLC/MS. The data show a good correlation between the degree of chemical damage and the ability to hybridise to molecular probes. The ability to achieve specific genetic profiles was assessed by multiplex PCR amplification of STR loci. Our data show that accurate determination of the molecular composition of the DNA recovered from forensic samples can be extremely useful for a reliable evaluation of the PCR typing results.

journal_name

Int J Legal Med

journal_title

International journal of legal medicine

authors

Previderè C,Micheletti P,Perossa R,Grignani P,Fattorini P

doi

10.1007/s00414-002-0326-7

subject

Has Abstract

pub_date

2002-12-01 00:00:00

pages

334-9

issue

6

eissn

0937-9827

issn

1437-1596

journal_volume

116

pub_type

杂志文章

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