Krebs cycle intermediates regulate DNA and histone methylation: epigenetic impact on the aging process

Area of Science:

• Biochemistry
• Epigenetics
• Aging Research

Background:

• Mitochondria and energy metabolism are implicated in aging.
• Epigenetics, including DNA and histone methylation, is crucial for healthspan and aging.
• Krebs cycle intermediates influence epigenetic regulation.

Purpose of the Study:

• To review epigenetic mechanisms linking Krebs cycle intermediates to DNA and histone methylation.
• To propose that age-related Krebs cycle disturbances promote aging via epigenetic alterations.

Main Methods:

• Review of scientific literature on Krebs cycle, epigenetics, and aging.
• Analysis of the role of 2-oxoglutarate (α-ketoglutarate) and its dependent enzymes (2-OGDO).
• Examination of the inhibitory effects of succinate and fumarate on 2-OGDO.

Main Results:

• 2-oxoglutarate (α-ketoglutarate) is a substrate for 2-OGDO enzymes, including TETs and JmjC demethylases, which regulate DNA and histone methylation.
• Other Krebs cycle intermediates like succinate and fumarate inhibit 2-OGDO, affecting methylation levels.
• The balance of Krebs cycle reactions influences gene expression through epigenetic modifications.

Conclusions:

• Krebs cycle intermediates epigenetically control DNA and histone methylation.
• Age-related disruptions in the Krebs cycle may lead to stochastic epigenetic changes, contributing to aging.