Tier 3 — preclinical

SIRT6 represses LINE1 retrotransposons by ribosylating KAP1 but this repression fails with stress and age

Michael Van Meter, Mehr Kashyap, Sarallah Rezazadeh, Anthony J Geneva, Timothy D Morello, Andrei Seluanov, Vera Gorbunova
Nature Communications 2014 5:5011

Bibliography

PubMed
PMID 25247314
PubMed Central
PMC4185372
DOI
10.1038/ncomms6011
Funding
Supported by U.S. National Institutes of Health grants and Ellison Medical Foundation support to the investigators.
Competing interests
The authors declared no competing financial interests.

Study snapshot

DesignMechanistic chromatin and retrotransposon study examining SIRT6-dependent KAP1 ribosylation and LINE1 silencing.
ModelCultured mammalian cells and aging/stress models.
SampleAssay-specific sample sizes reported in the paper.
InterventionSIRT6 manipulation, stress and aging-related comparisons.
DurationExperiment-dependent.
EndpointsLINE1 transcription; KAP1 ribosylation; SIRT6 chromatin recruitment; age/stress-related loss of LINE1 silencing

What the study showed, in plain terms

This study showed that SIRT6 helps keep LINE1 retrotransposons silent by modifying KAP1. That control weakened with cellular stress and aging, providing a mechanistic bridge between SIRT6, genome stability and age-related retrotransposon activity.

Key findings

SIRT6-dependent mono-ADP-ribosylation of KAP1 supported LINE1 repression, while aging and stress reduced effective silencing.

What this study can and cannot tell us

The work establishes mechanism, not a human clinical effect. It does not show that a SIRT6 supplement suppresses LINE1 activity 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