Scientists Reveal Chemical Pathway That Preserves Ancient Human Brains for Millennia
Researchers have identified how low-oxygen, water-logged burial conditions cause brain proteins to cross-link, allowing thousands of ancient brains to survive for up to 12,000 years.
New research offers a molecular explanation for the long-standing archaeological puzzle of preserved human brains, some dating back 12,000 years. By examining mouse brains buried under varying water and oxygen conditions, scientists discovered that wet, oxygen-deficient settings promote oxidative cross-linking of certain peptides, especially those linked to metals, lipids, and redox-active amino acids. This chemical bonding renders the proteins less soluble and more resistant to enzymatic breakdown, allowing the brain tissue to endure while surrounding soft tissue disappears.
The findings, published in the Journal of Proteome Research and led by Alexandra Morton-Hayward of the University of Oxford, modeled over 1.26 million peptide decay trajectories to pinpoint the resilient molecular features. The work also notes parallels between these preservation mechanisms and protein stability observed in brain aging and neurodegenerative disease research, suggesting broader relevance for forensic and palaeoproteomic studies.
Why it matters
Understanding brain preservation helps archaeologists interpret ancient remains and may inform forensic and protein-stability research.
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