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Evaluation of gastrointestinal cancer tissues as a source of genetic information for forensic investigations by using STRs.

Abstract：

:Malignant tissue samples may sometimes be the only source of biological material for forensic investigations, including identification of individuals or paternity testing. However, in use of such samples, uncertainties due to microsatellite instability (MSI) and loss of heterozygosity (LOH) often associated with neoplasias may be encountered. In this study, we have analysed the applicability of autosomal tetranucleotide short tandem repeat (STR) markers, which are routinely used in forensic analysis, to gain genetic information. MSI and LOH were analysed in 41 surgically removed gastrointestinal cancer specimens and the adjascent non-cancerous tissue marginals. The cancer specimens showed great variability in their genetic phenotypes due to MSI or LOH, with only 32% being microsatellite-stable. Of the 15 autosomal STR loci analysed, only TH01 had no MSI-type alteration in these samples. The loci most frequently affected by MSI were D8S1179, D21S11, D18S51 and D19S433 (MSI in 15-17% of cases). LOH-type alterations were observed at all of the loci, including the amelogenin locus used for sex determination. The highest LOH frequency was found at locus D18S51 (27%). The genetic alterations at the marker loci may indicate false homozygosity or heterozygosity, and false gender may result from erroneous deduction of DNA profiles. Therefore, typing of autosomal STRs from malignant tissues in forensic settings warrants careful interpretation of MSI and LOH results together with microscopic analysis of a tissue specimen. Results by two commercially available and widely used forensic DNA profiling kits used here were comparable.

journal_name

Forensic Sci Int

journal_title

Forensic science international

authors

Vauhkonen H,Hedman M,Vauhkonen M,Kataja M,Sipponen P,Sajantila A

doi

10.1016/j.forsciint.2003.10.016

keywords:

subject

Has Abstract

pub_date

2004-01-28 00:00:00

pages

159-67

issue

2-3

eissn

0379-0738

issn

1872-6283

pii

S037907380300478X

journal_volume

139

pub_type

杂志文章

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