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DNA methylation age estimation in blood samples of living and deceased individuals using a multiplex SNaPshot assay.

Abstract：

:Many studies in the forensic field have reported that analysis of DNA methylation is the most reliable method of predicting age. In a previous study, 5 CpG sites located in ELOVL2, FHL2, KLF14, C1orf132 and TRIM59 genes were tested for age prediction purposes in blood, saliva and buccal swab samples from Korean individuals using a multiplex methylation SNaPshot assay. The main goals of the present study were i) to replicate the same multiplex SNaPshot assay in blood samples from Portuguese individuals, ii) to compare DNA methylation status between two different populations and iii) to address putative differences in the methylation status between blood from living and deceased individuals. Blood samples from 59 living individuals (37 females, 22 males; aged 1-94 years-old) and from 62 deceased individuals (13 females, 49 males; aged 28-86 years-old) were evaluated. The specific primers were those previously described. Linear regression models were used to analyse relationships between methylation levels and chronological age using IBM SPSS software v.24. Our results allowed to build a final age prediction model (APM) for blood samples of living individuals with 3 CpG sites, at ELOVL2, FHL2 and C1orf132 genes, explaining 96.3% of age variation, with a mean absolute deviation (MAD) from chronological age of 4.25 years. Some differences were found in the extent of the age association in the targeted loci comparing Portuguese with Korean individuals. The final APM built for deceased individuals included 4 CpG sites, at ELOVL2, FHL2, C1orf132 and TRIM59 genes, explaining 79.3% of age variation, with a MAD of 5.36 years. Combining both sets of samples from living and deceased individuals, the most accurate APM with 4 CpGs, at ELOVL2, FHL2, C1orf132 and TRIM59 genes, explained 92.5% of variation in age, with a MAD of 4.97 years. In conclusion, our study replicated in blood samples of Portuguese living individuals a previous SNaPshot assay for age estimation. The possibility that age markers might be population specific and that postmortem changes can alter the methylation status among specific loci was suggested by our data. Our study showed the usefulness of the multiplex methylation SNaPshot assay for forensic analysis in blood samples of living and deceased individuals.

journal_name

Forensic Sci Int

journal_title

Forensic science international

authors

Dias HC,Cordeiro C,Pereira J,Pinto C,Real FC,Cunha E,Manco L

doi

10.1016/j.forsciint.2020.110267

subject

Has Abstract

pub_date

2020-06-01 00:00:00

pages

110267

eissn

0379-0738

issn

1872-6283

pii

S0379-0738(20)30129-8

journal_volume

311

pub_type

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