Circular RNA circHERC1 Activates Telomerase to Reverse Cellular Aging
Scientists discover a circular RNA that reactivates telomerase enzyme, extending telomeres and reversing aging markers in cells and tissues.
Summary
Researchers identified circHERC1, a circular RNA that directly activates telomerase by binding to the TERT gene promoter and recruiting transcription factors. This molecule declines with age, but restoring it through viral delivery or extracellular vesicles enhanced telomerase activity, lengthened telomeres, and reversed aging phenotypes including improved cognitive function and reduced inflammation in experimental models.
Detailed Summary
Telomerase, the enzyme responsible for maintaining protective telomere caps on chromosomes, typically becomes silenced in aging cells, contributing to cellular senescence and age-related decline. This groundbreaking study reveals a novel regulatory mechanism through circHERC1, a circular RNA that directly controls telomerase activity.
Researchers discovered that circHERC1 functions as a transcriptional activator by binding directly to the TERT gene promoter region. This binding facilitates recruitment of RNA polymerase II and the transcription factor c-Fos, effectively turning on TERT expression and boosting telomerase activity. Importantly, circHERC1 levels naturally decline with age, correlating with reduced telomerase function.
Experimental restoration of circHERC1 through multiple delivery methods—including adeno-associated virus vectors and extracellular vesicles—successfully reactivated telomerase, promoted telomere elongation, and reversed multiple aging-associated cellular phenotypes. The interventions led to measurable improvements in cognitive function, enhanced physical performance, and reduced inflammatory markers.
These findings represent a significant advance in understanding telomerase regulation and offer a potential therapeutic pathway for anti-aging interventions. The ability to reactivate telomerase through circHERC1 could address fundamental mechanisms of cellular aging, though translation to human applications requires extensive safety evaluation given telomerase's complex role in both longevity and cancer risk.
Key Findings
- circHERC1 directly binds TERT promoter to activate telomerase transcription
- circHERC1 expression declines with age, correlating with reduced telomerase activity
- Restoring circHERC1 lengthens telomeres and reverses aging cellular phenotypes
- Viral and vesicle delivery of circHERC1 improves cognitive and physical function
- Treatment reduces inflammation and mitigates cellular senescence markers
Methodology
Study used multiple cell lines and animal models to characterize circHERC1 function through RNA-protein binding assays, chromatin immunoprecipitation, telomerase activity measurements, and delivery via adeno-associated virus vectors and extracellular vesicles.
Study Limitations
The study primarily uses laboratory models, and clinical translation faces significant challenges given telomerase's dual role in longevity and cancer. Long-term safety of telomerase reactivation in humans remains unknown and requires extensive investigation.
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