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Scientific result | Health ＆ life sciences | Genomics | Biomarkers
In an article published the 10th of May in Nature Communications, some Research Teams of the Frédéric Joliot Institute (SBIGeM, SPI) discovered that a new histone variant called H2A.J accumulates in human fibroblasts in senescence. Thanks to a national (CNG-Evry, Institut Pasteur, CRC-Lyon) and international collaboration (NIH, Stanford, University of Saarland), coordinated by the SBIGeM Team, this consortium showed that the accumulation of H2A.J in fibroblasts in senescence promotes the expression of the genes of inflammation. These results suggest that H2A.J may be a new biomarker of senescent skin cells in humans.
The senescence of mammalian cells is characterized by a proliferative arrest in response to stress and the expression of an inflammatory phenotype. Here we show that histone H2A.J, a poorly studied H2A variant found only in mammals, accumulates in human fibroblasts in senescence with persistent DNA damage. H2A.J also accumulates in mice with aging in a tissue-specific manner and in human skin. Knock-down of H2A.J inhibits the expression of inflammatory genes that contribute to the senescent-associated secretory phenotype (SASP), and over expression of H2A.J increases the expression of some of these genes in proliferating cells. H2A.J accumulation may thus promote the signalling of senescent cells to the immune system, and it may contribute to chronic inflammation and the development of aging-associated diseases.Read the whole article.
Contrepois K, Coudereau C, Benayoun BA, Schuler N, Roux PF, Bischof O, Courbeyrette R, Carvalho C, Thuret JY, Ma Z, Derbois C, Nevers MC, Volland H, Redon CE, Bonner WM, Deleuze JF, Wiel C, Bernard D, Snyder MP, Rübe CE, Olaso R, Fenaille F, Mann C. Histone variant H2A.J accumulates in senescent cells and promotes inflammatory gene expression. (2017) Nat Commun.10;8:14995
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.