Tier 3 — preclinical

SIRT6 rescues the age related decline in base excision repair in a PARP1-dependent manner

Zhu Xu, Lei Zhang, Wenjun Zhang, Du Meng, Hongxia Zhang, Ying Jiang, Xiaojun Xu, Michael Van Meter, Andrei Seluanov, Vera Gorbunova, Zhiyong Mao
Cell Cycle 2015 14(2):269-276

Bibliography

PubMed
PMID 25607651
DOI
10.4161/15384101.2014.980641
Funding
Supported in part by NIH/NIA grants F31 AG041603, P01 AG047200 and R01 AG027237.

Study snapshot

DesignCross-sectional primary human fibroblast donor study plus mechanistic overexpression/PARP1 experiments.
ModelPrimary foreskin fibroblasts from 19 human donors aged 20-64 years.
Sample19 human donors.
InterventionSIRT6 overexpression and PARP1-dependent mechanistic experiments.
DurationCellular experimental study.
EndpointsBase-excision repair efficiency; SIRT6 expression versus donor age; PARP1 dependence; Rescue of age-related repair decline

What the study showed, in plain terms

Base-excision repair efficiency declined with donor age in primary human fibroblasts, alongside lower SIRT6 expression. Increasing SIRT6 rescued much of the repair decline through a PARP1-dependent mechanism.

Key findings

The study provides direct human-cell evidence linking age-related SIRT6 decline to impaired base-excision repair and showing experimental rescue by SIRT6 overexpression.

What this study can and cannot tell us

This is an ex vivo cell study using fibroblasts, not a clinical intervention. It cannot establish that a SIRT6 activator improves organism-level DNA repair or aging outcomes in people.

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Dr. Khaled Mahmoud, MBBChCritical Care Medicine, Longevity Science & Editorial Direction Dr. Abdulla Mostafa, PhDCellular Senescence, Neurological, Mitochondrial & Brain-Ageing Biology Dr. Amr Yasser, PhDCardiometabolic, Musculoskeletal, Gut & Bioavailability