Age related changes in 5-methylcytosine content in human peripheral leukocytes and placentas: an HPLC-based study.

Abstract:

:The goal of the present study was to investigate inter-individual and age-dependent variation of global DNA methylation in human tissues. In this work, we examined 5-methyldeoxycytidine ((met)C) content by HPLC in human peripheral blood leukocytes obtained from 76 healthy individuals of ages varying from 4 to 94 years (yr), and 39 human placentas from various gestational stages. The HPLC analysis revealed a significant variation of (met)C across individuals and is consistent with the previous findings of age-dependent decrease of global methylation levels in human tissues. The age-dependent decrease of (met)C was relatively small, but statistically highly significant (p= 0.0002) in the aged group (65.9 +/- 8.9 [mean age +/- SD] yr; n = 22) in comparison to the young adult group (19.3 +/- 1.4 yr; n = 21). Males showed a subtle but statistically significant higher mean (met)C content than females. In contrast to the peripheral blood samples, DNA extracted from placentas exhibited gestational stage-dependent increase of methylation levels that appeared to inversely correlate with the expression levels of human endogenous retroviruses. These data may be helpful in further studies of DNA methylation, such as inheritance of epigenetic patterns, environment-induced changes, and involvement of epigenetic changes in disease.

journal_name

Ann Hum Genet

journal_title

Annals of human genetics

authors

Fuke C,Shimabukuro M,Petronis A,Sugimoto J,Oda T,Miura K,Miyazaki T,Ogura C,Okazaki Y,Jinno Y

doi

10.1046/j.1529-8817.2004.00081.x

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

196-204

issue

Pt 3

eissn

0003-4800

issn

1469-1809

pii

AHG081

journal_volume

68

pub_type

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