Aging is accompanied by a progressive decrease of expression of the WRN gene in human blood mononuclear cells

Area of Science:

• Genetics and Molecular Biology
• Aging Research
• Immunology

Background:

• The Werner syndrome protein (WRN) gene is crucial for genome maintenance, acting as a DNA helicase.
• Understanding WRN's role in aging is vital for addressing age-related decline and diseases.
• Previous research suggests WRN's involvement in cellular senescence and organismal aging.

Purpose of the Study:

• To investigate the association between natural aging and the expression, methylation, and common polymorphisms of the WRN gene.
• To explore the potential contribution of WRN gene alterations to human immunosenescence.

Main Methods:

• Analysis of WRN messenger RNA (mRNA) levels in blood mononuclear cells across different age groups.
• Assessment of WRN promoter CpG island methylation status in relation to age.
• Genotyping of common WRN polymorphisms (R834C, L1074F, C1367R) in an ethnically homogenous Polish Caucasian population.

Main Results:

• A significant decrease in mean WRN mRNA levels was observed in long-living individuals compared to younger and middle-aged controls.
• A slight, biologically insignificant increase in WRN promoter methylation was noted with aging.
• The L1074F and C1367R polymorphisms showed similar frequencies across age groups, while the R834C polymorphism was absent in the studied population.

Conclusions:

• Age-related decline in WRN gene expression, rather than its common genetic variants, may contribute to human immunosenescence.
• The findings highlight the importance of WRN expression levels in the aging process.
• Further research is warranted to elucidate the precise mechanisms linking WRN to immune system aging.