m6A RNA methylation regulates mitochondrial function

Area of Science:

• Molecular Biology
• Cellular Biology
• Neuroscience

Background:

• N6-methyladenosine (m6A) is a key RNA modification regulating RNA biology.
• Mitochondrial function is critical, especially in high-energy demand neuronal cells.
• The role of RNA methylation in mitochondrial regulation remained largely unknown.

Purpose of the Study:

• To investigate the role of m6A RNA methylation in regulating mitochondrial function in neuronal cells.
• To elucidate the molecular mechanisms by which m6A affects mitochondrial activity.

Main Methods:

• Conditional genetic knockout of Mettl14 (Methyltransferase like 14) in mice.
• Metabolomic analysis and m6A-Seq (RNA methylation profiling).
• Assessment of mitochondrial respiration, membrane potential, and protein expression.

Main Results:

• Mettl14 knockout led to m6A depletion and downregulated energy metabolism metabolites.
• m6A-Seq revealed enrichment of methylation on mitochondria-related RNAs.
• Loss of m6A reduced mitochondrial respiratory capacity, membrane potential, and electron transport chain complex activity by decreasing translational efficiency.

Conclusions:

• m6A RNA methylation is a novel regulator of mitochondrial function, essential for promoting the translation of nuclear-encoded mitochondrial proteins.
• This pathway is crucial for maintaining cellular energy homeostasis and neuronal function.
• Dysregulation of m6A-mediated mitochondrial regulation may contribute to neurodegenerative diseases.