Persistent Transcription-blocking DNA Lesions Trigger Somatic Growth Attenuation Associated with Longevity
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The accumulation of stochastic DNA damage throughout an organism's lifespan is thought to contribute to ageing. Conversely, ageing seems to be phenotypically reproducible and regulated through genetic pathways such as the insulin-like growth factor-1 (IGF-1) and growth hormone (GH) receptors, which are central mediators of the somatic growth axis. Here we report that persistent DNA damage in primary cells from mice elicits changes in global gene expression similar to those occurring in various organs of naturally aged animals. We show that, as in ageing animals, the expression of IGF-1 receptor and GH receptor is attenuated, resulting in cellular resistance to IGF-1. This cell-autonomous attenuation is specifically induced by persistent lesions leading to stalling of RNA polymerase II in proliferating, quiescent and terminally differentiated cells; it is exacerbated and prolonged in cells from progeroid mice and confers resistance to oxidative stress. Our findings suggest that the accumulation of DNA damage in transcribed genes in most if not all tissues contributes to the ageing-associated shift from growth to somatic maintenance that triggers stress resistance and is thought to promote longevity.
Vermeij W, Alyodawi K, van Galen I, von der Heide J, Birkisdottir M, Vant Sant L J Cachexia Sarcopenia Muscle. 2024; 15(6):2361-2374.
PMID: 39245994 PMC: 11634475. DOI: 10.1002/jcsm.13570.
The small CRL4 ubiquitin ligase component DDA1 regulates transcription-coupled repair dynamics.
Llerena Schiffmacher D, Lee S, Kliza K, Theil A, Akita M, Helfricht A Nat Commun. 2024; 15(1):6374.
PMID: 39075067 PMC: 11286758. DOI: 10.1038/s41467-024-50584-7.
Time is ticking faster for long genes in aging.
Soheili-Nezhad S, Ibanez-Sole O, Izeta A, Hoeijmakers J, Stoeger T Trends Genet. 2024; 40(4):299-312.
PMID: 38519330 PMC: 11003850. DOI: 10.1016/j.tig.2024.01.009.
Blasius K, Ludwig L, Knapp S, Flasshove C, Sonnabend F, Keller D Cell Mol Life Sci. 2024; 81(1):102.
PMID: 38409522 PMC: 10896983. DOI: 10.1007/s00018-024-05132-3.
XPF interacts with TOP2B for R-loop processing and DNA looping on actively transcribed genes.
Chatzinikolaou G, Stratigi K, Siametis A, Goulielmaki E, Akalestou-Clocher A, Tsamardinos I Sci Adv. 2023; 9(45):eadi2095.
PMID: 37939182 PMC: 10631727. DOI: 10.1126/sciadv.adi2095.