A mere four mutations help the naked mole rat fix its DNA and live longer, Pg2

Key Highlights:

• The naked mole rat lives up to 37 years, nearly 10x longer than similar-sized mammals.
• Four amino acid substitutions in the cGAS structure of naked mole rats enhance DNA repair.
• Modified cGAS in naked mole rats binds to DNA longer, preventing its destruction via ubiquitination.
• Modified cGAS brings together FANCI and RAD50 proteins to speed up homologous recombination.

Detailed Insights:

• As organisms age, DNA damage accumulates, and efficient DNA repair becomes crucial for longevity.
• In humans and mice, cGAS detects foreign DNA and triggers immune responses but suppresses homologous recombination.
• Naked mole rat cGAS enhances homologous recombination due to four amino acid substitutions.
• These substitutions allow cGAS to remain bound to DNA longer, preventing ubiquitination and destruction.
• Modified cGAS recruits FANCI and RAD50 proteins, accelerating DNA break repair.
• Introducing these four amino acid changes into human cGAS stopped it from harming DNA repair.
• Medicines adjusting cGAS interactions with DNA might help maintain genome integrity without compromising the immune system.

Scientific/Technical Concepts Involved:

• cGAS (cyclic GMP-AMP synthase): An enzyme involved in detecting foreign DNA and triggering immune responses.
• Homologous Recombination: A major DNA repair pathway that fixes DNA breaks using a homologous template.
• Ubiquitination: A process where proteins are tagged for degradation or destruction.
• Amino acid substitutions: Replacement of one amino acid with another in a protein's sequence.