Methionine synthase reductase regulates heterochromatin independently of methionine synthesis through mitochondrial homeostasis

Loss of MTRR-1 in Caenorhabditis elegans disrupts heterochromatin and mitochondrial homeostasis independently of methionine synthesis, with a 50% reduction in heterochromatic histone methylation.

• Why it matters: Understanding how metabolic enzymes influence chromatin organization is crucial because it links cellular metabolism to gene regulation and development, yet the specific mechanisms remain unclear.
• What they did: The study used multi-omics profiling, genetic manipulation, and functional assays to investigate MTRR-1’s role, revealing its impact on mitochondrial function and heterochromatin regulation beyond methionine metabolism.
• The result: Disruption of mitochondrial homeostasis by MTRR-1 loss leads to heterochromatin derepression, highlighting a mitochondria-to-chromatin pathway that maintains heterochromatin independently of canonical methionine synthesis.