DNA hydroxymethylation age of human blood determined by capillary hydrophilic-interaction liquid chromatography/mass spectrometry.

Abstract:

BACKGROUND:Aging is a complex phenomenon and characterized by a progressive decline in physiology and function of adult tissues. However, it hasn't been well established of the correlation between aging and global DNA methylation and hydroxymethylation that regulate the growth and development of higher organisms. RESULTS:We developed an on-line trapping/capillary hydrophilic-interaction liquid chromatography/electrospray ionization-mass spectrometry method for ultra-sensitive and simultaneous quantification of 5-methylcytosine (5-mC) and 5-hydroxymethylcytosine (5-hmC) in genomic DNA from human blood. Limits of detection for 5-mC and 5-hmC were 0.04 and 0.13 fmol, respectively. The imprecision and recovery of the method were determined with the relative standard deviations (RSDs) and relative errors being <11.2 and 14.0 %, respectively. We analyzed the contents of 5-mC and 5-hmC in genomic DNA of blood from 238 healthy people aged from 1 to 82 years. The results showed that 5-hmC content was significantly decreased and highly correlated with aging process, while 5-mC only showed slight correlation with age. We then established a DNA hydroxymethylation age model according to 5-hmC content with a mean absolute deviation (MAD) of approximate 8.9 years. We also calculated the mean relative error (MRE) using the predicted ages based on the age model and the chronological ages. The results showed that the MRE was 18.3 % for samples with ages from 20 to 82 years (95 % confidence interval, N = 190). CONCLUSIONS:The global DNA hydroxymethylation represents a strong and reproducible mark of chronological age, which could be potentially applied in health assessment and prevention of diseases. The identification of biological or environmental factors that influence DNA hydroxymethylation aging rate may permit quantitative assessments of their impacts on health.

journal_name

Clin Epigenetics

journal_title

Clinical epigenetics

authors

Xiong J,Jiang HP,Peng CY,Deng QY,Lan MD,Zeng H,Zheng F,Feng YQ,Yuan BF

doi

10.1186/s13148-015-0109-x

subject

Has Abstract

pub_date

2015-07-23 00:00:00

pages

72

eissn

1868-7075

issn

1868-7083

pii

109

journal_volume

7

pub_type

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