All articles tagged with #dna repair
Researchers find bowhead whale cells show enhanced DNA repair, especially for dangerous double-strand breaks, and unusually high levels of the cold-inducible CIRBP protein. These genomic and cellular traits may help explain the whale’s 200+ year lifespan and its resistance to cancer, reinforcing bowheads as a valuable model for aging research. While promising, translating these insights to humans is complex and not guaranteed.
Scientists traced naked mole-rats’ exceptional lifespan to four amino acid changes in their version of the DNA-sensing protein cGAS. These substitutions prolong cGAS, shifting its interaction from suppressing to promoting homologous recombination with key repair proteins, leading to more efficient DNA repair and reduced aging-related damage. Experiments removing cGAS increased DNA damage in mole-rat cells, while introducing the four substitutions into fruit flies extended their lifespans, suggesting potential human longevity avenues—but the mole-rat’s longevity likely relies on multiple mechanisms, and translating this to humans remains uncertain and distant.
Scientists have produced the first atomic-level images of the human DNA repair enzyme SMUG1, revealing how it recognizes and removes damaged bases such as uracil and 5-fluorouracil. By capturing SMUG1 in multiple states—alone, bound to uracil or 5-fluorouracil, and attached to double-stranded DNA—using a rare combined neutron–X-ray approach, the study maps active-site proton positions and hydrogen-bond networks. These insights advance understanding of DNA repair and could guide the design of drugs targeting SMUG1, with implications for cancer biology and leveraging Sweden’s new European Spallation Source neutron capabilities.
Scientists have completed the Greenland shark's first near-complete genome (96.7% coverage), revealing genetic features linked to its extraordinary longevity and cancer resistance, including amino acid changes in linker histone proteins that may stabilize chromatin and expansions of DNA repair and immune genes, plus ferritin gene expansion suggesting enhanced iron metabolism. The findings indicate longevity likely comes from coordinated genome stability, metabolism, and immune regulation, with implications for understanding aging in humans.
In homologous recombination–proficient cancers, α-ketoglutarate (αKG) fuels de novo carnitine synthesis via the enzyme TMLHE, boosting acetyl-CoA–dependent histone acetylation at site-specific marks (H3K23ac, H4K8ac, H4K12ac) and enabling HR repair; disrupting this αKG–carnitine axis sensitizes cells to DNA-damaging therapies, while providing αKG or acetylcarnitine rescues repair. Clinically, high TMLHE or acetylcarnitine correlates with worse progression-free survival in ovarian cancer patients treated with platinum chemotherapy. Pharmacologically inhibiting carnitine synthesis (mildronate) reduces tumor burden in combination with cisplatin in mice. These findings reveal a nonredundant nuclear acetyl-CoA pool provided by de novo carnitine synthesis that links metabolism to site-specific histone acetylation and HR proficiency, offering potential biomarkers and therapeutic strategies.
Buck Institute researchers show that APOE2 helps neurons repair DNA and resist aging by reducing DNA damage and cellular senescence; studies in human iPSC-derived neurons and aged mice reveal APOE2–driven DNA repair activation and better nuclear integrity, offering a potential mechanism for APOE2's lower Alzheimer’s risk and longer lifespan and suggesting therapies that boost DNA repair for APOE4 carriers.
Scientists tracing bowhead whales’ 200-year cancer-free lifespans identify CIRBP as a key genome-maintenance protein; boosting the whale’s CIRBP in human and fruit-fly cells improved DNA repair and, in flies, extended lifespan. CIRBP levels rise in colder conditions, which may help explain bowheads’ long lives in frigid waters. Researchers are exploring ways to raise CIRBP in humans, but it’s early-stage and unproven.
Researchers linked elevated CIRBP activity in the bowhead whale to enhanced DNA repair and reduced inflammation, a mechanism that could underlie its exceptional longevity; boosting CIRBP in fruit flies extended lifespan and stress resistance, suggesting a possible pathway to longer human life—potentially up to about 200 years if replicated in humans.
Scientists have found more than 200 metabolic enzymes directly attached to human DNA in the nucleus, suggesting a small, tissue- and cancer-specific 'mini-metabolism' that may influence gene regulation, DNA repair, and tumor response to therapy. The enzymes’ nuclear roles appear to differ by cancer type (e.g., oxidative phosphorylation enzymes common in breast but not lung cancer) and some, like IMPDH2, show location-dependent functions, prompting potential new biomarkers and drug targets while many details remain to be clarified.
Researchers show that all five RAD51 paralogs can assemble into two distinct, ATP-dependent assemblies: a BCDX2-CX3 loader that templates RAD51 filament formation on ssDNA, and a RAD51B-independent DX2-CX3 anchor that caps and stabilizes the filament; together, these modular assemblies define loader vs. anchor roles in homologous recombination and illuminate disease-causing mutations.
Scientists estimate Greenland sharks can live around 400–500 years and have found that eye tissue remains capable of vision in old age due to heightened DNA repair activity. Genome analysis reveals expanded DNA repair genes and a unique p53 insertion, and their hearts tolerate age-related damage. Researchers caution that this does not imply immediate human health applications or any antiaging use for shark products.
Research shows that just 10 minutes of intense exercise can trigger molecular changes in the bloodstream that may slow cancer growth, support DNA repair, and reduce inflammation, highlighting exercise's potential role in cancer prevention and treatment.
A study shows that just 10 minutes of intense cycling can trigger anti-cancer signals in the body by releasing molecules that promote DNA repair and reduce cancer growth genes, potentially opening new avenues for cancer treatment and emphasizing the health benefits of even brief exercise sessions.
A Newcastle University study shows that just 10 minutes of daily exercise can promote DNA repair and inhibit bowel cancer growth by triggering beneficial molecular changes in the blood, suggesting exercise as a powerful tool in cancer prevention.
A study from Newcastle University found that just 10 minutes of exercise can help halt bowel cancer growth and enhance DNA repair, suggesting even short workouts can have significant protective effects against cancer.