SIRT6 facilitates directional telomere movement upon oxidative damage

Area of Science:

• Cellular Biology
• Genetics
• Molecular Biology

Background:

• Oxidative damage causes telomere attrition and genomic instability, impacting cell viability.
• Telomere dynamics are crucial for telomere integrity, but regulation of telomere movement under oxidative stress is unclear.

Purpose of the Study:

• To investigate if oxidative damage induces telomere movement.
• To elucidate the regulatory mechanisms of oxidative damage-induced telomere mobility.

Main Methods:

• Utilized wild type (WT) and Sirtuin 6 (SIRT6) knockout (KO) cells.
• Observed telomere movement and chromatin decondensation in response to oxidative damage.
• Analyzed the role of a SIRT6 deacetylation mutant and SNF2H recruitment.

Main Results:

• Oxidative damage induced directional telomere movement in WT cells, but not in SIRT6 KO cells.
• SIRT6 is essential for oxidative damage-induced telomere movement and chromatin decondensation.
• A deacetylation-deficient SIRT6 mutant enhanced telomere movement, and SIRT6 recruited SNF2H to damaged telomeres, promoting chromatin decondensation.

Conclusions:

• Sirtuin 6 (SIRT6) regulates telomere movement in response to oxidative damage.
• SIRT6 recruits SNF2H to facilitate chromatin decondensation at damaged telomeres, independent of its deacetylase activity.
• These findings reveal a novel role for SIRT6 in telomere maintenance under oxidative stress.