Heteroplasmy in hair: differences among hair and blood from the same individuals are still a matter of debate.

Abstract:

:The analysis of mitochondrial DNA (mtDNA) is a useful tool in forensic cases when sample contents too little or degraded nuclear DNA to genotype by autosomal short tandem repeat (STR) loci, but it is especially useful when the only forensic evidence is a hair shaft. Several authors have related differences in mtDNA from different tissues within the same individual, with high frequency of heteroplasmic variants in hair, as also in some other tissues. Is still a matter of debate how the differences influence the interpretation forensic protocols. One difference between two samples supposed to be originated from the same individual are related to an inconclusive result, but depending on the tissue and the position of the difference it should have a different interpretation, based on mutation-rate heterogeneity of mtDNA. In order to investigate it differences in the mtDNA control region from hair shafts and blood in our population, sequences from the hypervariable regions 1 and 2 (HV1 and HV2) from 100 Brazilian unrelated individuals were compared. The frequency of point heteroplasmy observed in hair was 10.5% by sequencing. Our study confirms the results related by other authors that concluded that small differences within tissues should be interpreted with caution especially when analyzing hair samples.

journal_name

Forensic Sci Int

authors

Paneto GG,Martins JA,Longo LV,Pereira GA,Freschi A,Alvarenga VL,Chen B,Oliveira RN,Hirata MH,Cicarelli RM

doi

10.1016/j.forsciint.2007.02.011

subject

Has Abstract

pub_date

2007-12-20 00:00:00

pages

117-21

issue

2-3

eissn

0379-0738

issn

1872-6283

pii

S0379-0738(07)00096-5

journal_volume

173

pub_type

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