{"id":58324,"date":"2016-01-20T13:50:02","date_gmt":"2016-01-20T21:50:02","guid":{"rendered":"https:\/\/www.chronobiology.com\/newly-discovered-genes-cause-circadian-rhythms-to-change-as-we-age\/"},"modified":"2024-07-18T14:45:15","modified_gmt":"2024-07-18T21:45:15","slug":"des-g-nes-r-cemment-d-couverts-entra-nent-une-modification-des-rythmes-circadiens-avec-l-ge","status":"publish","type":"post","link":"https:\/\/dev.chronobiology.com\/fr\/des-g-nes-r-cemment-d-couverts-entra-nent-une-modification-des-rythmes-circadiens-avec-l-ge\/","title":{"rendered":"Des g\u00e8nes r\u00e9cemment d\u00e9couverts entra\u00eenent une modification des rythmes circadiens avec l&rsquo;\u00e2ge"},"content":{"rendered":"<p>Les m\u00e9decins constatent depuis longtemps que les rythmes circadiens changent avec l&rsquo;\u00e2ge. De nouvelles recherches sugg\u00e8rent que cela est d\u00fb \u00e0 l&rsquo;action de g\u00e8nes jusqu&rsquo;alors inconnus.<\/p>\n<p>La plupart des personnes qui ont des parents \u00e2g\u00e9s ont remarqu\u00e9 qu&rsquo;ils vivent selon un rythme diff\u00e9rent. Les personnes \u00e2g\u00e9es ont tendance \u00e0 se coucher t\u00f4t, \u00e0 se lever t\u00f4t et \u00e0 faire davantage de siestes au cours de la journ\u00e9e. En outre, elles sont plus sujettes \u00e0 l&rsquo;insomnie, \u00e0 la fatigue et aux autres sympt\u00f4mes des nuits blanches. Une nouvelle \u00e9tude a permis de d\u00e9couvrir les g\u00e8nes responsables de ces modifications du rythme circadien qui <a href=\"https:\/\/www.chronobiology.com\/development-of-the-circadian-rhythm-in-infants\/\" target=\"_blank\" rel=\"noopener\">semblent \u00eatre associ\u00e9es \u00e0 l&rsquo;\u00e2ge<\/a>.<\/p>\n<h2>Comment les rythmes circadiens changent-ils avec l&rsquo;\u00e2ge ?<\/h2>\n<p>Les rythmes circadiens <a href=\"http:\/\/psychcentral.com\/news\/2015\/12\/25\/circadian-rhythm-of-genes-changes-with-age\/96730.html\" target=\"_blank\" rel=\"noopener\">\u00e9voluent de mani\u00e8re pr\u00e9visible au cours de la vie humaine<\/a>. La vieillesse s&rsquo;accompagne d&rsquo;un changement marqu\u00e9 du temps de sommeil, de nombreuses personnes \u00e2g\u00e9es dormant beaucoup moins qu&rsquo;elles ne le faisaient dans leur jeunesse. Cela peut entra\u00eener des siestes et des couchers pr\u00e9coces, deux comportements couramment observ\u00e9s chez les personnes \u00e2g\u00e9es.<\/p>\n<p>Le rythme circadien subit \u00e9galement d&rsquo;autres modifications. Les personnes \u00e2g\u00e9es ont tendance \u00e0 se r\u00e9veiller plus t\u00f4t le matin et ont de meilleures facult\u00e9s cognitives le matin que les personnes plus jeunes. En outre, les personnes \u00e2g\u00e9es pr\u00e9sentent moins de variations de la temp\u00e9rature corporelle et d&rsquo;autres indices biologiques importants.<\/p>\n<p>Toutes les modifications du rythme circadien chez les personnes \u00e2g\u00e9es ne sont pas aussi b\u00e9nignes. De nombreuses personnes \u00e2g\u00e9es, en particulier celles atteintes de d\u00e9mence, souffrent d&rsquo;un comportement connu sous le nom de \u00ab\u00a0sundowning\u00a0\u00bb, qui se traduit par une confusion et une agitation accrues le soir et la nuit. En outre, m\u00eame les personnes \u00e2g\u00e9es en bonne sant\u00e9 peuvent souffrir d&rsquo;un manque de sommeil dans des domaines cl\u00e9s tels que la <a href=\"https:\/\/www.chronobiology.com\/lack-of-sleep-negatively-affects-emotions\/\" target=\"_blank\" rel=\"noopener\">r\u00e9gulation \u00e9motionnelle<\/a> et les fonctions cognitives.<\/p>\n<h2>Le cerveau vieillissant<\/h2>\n<p>Des \u00e9tudes post-mortem du cerveau de personnes \u00e2g\u00e9es ont montr\u00e9 que <a href=\"http:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3405459\/\" target=\"_blank\" rel=\"noopener\">le cortex c\u00e9r\u00e9bral et les structures environnantes sont particuli\u00e8rement sujets \u00e0 la d\u00e9g\u00e9n\u00e9rescence li\u00e9e \u00e0 l&rsquo;\u00e2ge<\/a>. L&rsquo;hypothalamus, qui est le principal moteur des rythmes circadiens, est particuli\u00e8rement sujet \u00e0 ces changements. Les neurones de cette zone cl\u00e9 du cerveau d\u00e9g\u00e9n\u00e8rent rapidement vers la fin de la vie humaine, ce qui contribue \u00e0 une perte progressive des fonctions cognitives ainsi qu&rsquo;\u00e0 de nombreuses modifications du rythme circadien que nous associons \u00e0 l&rsquo;\u00e2ge.<\/p>\n<h2>Les g\u00e8nes \u00e0 l&rsquo;origine des modifications du rythme circadien li\u00e9es \u00e0 l&rsquo;\u00e2ge<\/h2>\n<p><a href=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2016\/01\/newly-discovered-genes-cause-circadian-rhythms-to-change-as-we-age.jpg\" rel=\"attachment wp-att-8145\"><img decoding=\"async\" class=\"alignright size-medium wp-image-8145\" src=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2016\/01\/newly-discovered-genes-cause-circadian-rhythms-to-change-as-we-age-300x188.jpg\" alt=\"Newly-Discovered Genes Cause Circadian Rhythms to Change as We Age\" width=\"300\" height=\"188\" srcset=\"https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2016\/01\/newly-discovered-genes-cause-circadian-rhythms-to-change-as-we-age-300x188.jpg 300w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2016\/01\/newly-discovered-genes-cause-circadian-rhythms-to-change-as-we-age-768x480.jpg 768w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2016\/01\/newly-discovered-genes-cause-circadian-rhythms-to-change-as-we-age.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>Une <a href=\"http:\/\/www.sciencealert.com\/a-new-circadian-clock-takes-over-when-we-get-older-study-finds\" target=\"_blank\" rel=\"noopener\">nouvelle \u00e9tude chronobiologique<\/a> a permis d&rsquo;identifier les g\u00e8nes qui pourraient \u00eatre responsables de ces modifications du cycle veille-sommeil li\u00e9es \u00e0 l&rsquo;\u00e2ge. Ces g\u00e8nes sont actifs chez les personnes de tous \u00e2ges, mais ils prennent le dessus et deviennent les moteurs dominants du rythme circadien \u00e0 mesure que nous vieillissons. Les chercheurs pensent que ces g\u00e8nes peuvent devenir dominants pour compenser la perte d&rsquo;autres g\u00e8nes de l&rsquo;horloge biologique li\u00e9e \u00e0 l&rsquo;\u00e2ge.<\/p>\n<p>Malheureusement, l&rsquo;homme subit de nombreuses l\u00e9sions de l&rsquo;ADN avec l&rsquo;\u00e2ge. En outre, certains g\u00e8nes cessent tout simplement de fonctionner pour des raisons inconnues. Bon nombre des changements que nous associons au vieillissement, tels que les modifications de la texture de la peau et la perte de la m\u00e9moire \u00e0 court terme, sont en fait dus \u00e0 une perte de fonction de nombreux g\u00e8nes.<\/p>\n<h2>Nouvelles d\u00e9couvertes, nouveaux espoirs<\/h2>\n<p>La mani\u00e8re exacte dont ces g\u00e8nes diff\u00e8rent des autres g\u00e8nes connus du rythme circadien fera l&rsquo;objet d&rsquo;\u00e9tudes futures. On esp\u00e8re que ces nouvelles d\u00e9couvertes permettront de mettre au point de nouveaux traitements pour les troubles du sommeil et d&rsquo;autres troubles qui apparaissent avec l&rsquo;\u00e2ge. Il existe peut-\u00eatre des moyens de prolonger la fonction des <a href=\"https:\/\/www.chronobiology.com\/gene-that-controls-the-internal-clock-discovered\/\" target=\"_blank\" rel=\"noopener\">g\u00e8nes du rythme circadien<\/a> qui cessent de fonctionner avec l&rsquo;\u00e2ge. En outre, le remplacement des produits de ces g\u00e8nes pourrait constituer une voie de traitement efficace.<\/p>\n<p>Le traitement de la d\u00e9pression, de la perte de m\u00e9moire et des troubles du sommeil chez les personnes \u00e2g\u00e9es est l&rsquo;une des t\u00e2ches les plus difficiles pour les m\u00e9decins sp\u00e9cialis\u00e9s en g\u00e9riatrie. L&rsquo;identification des modifications des rythmes circadiens et des g\u00e8nes responsables de ces modifications n&rsquo;est que la premi\u00e8re \u00e9tape dans la mise au point de meilleurs traitements pour ces troubles courants chez les personnes \u00e2g\u00e9es. Ces progr\u00e8s permettront aux personnes \u00e2g\u00e9es d&rsquo;\u00eatre en meilleure sant\u00e9 et plus heureuses, ce qui nous permettra \u00e0 tous de mieux dormir la nuit.<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les m\u00e9decins constatent depuis longtemps que les rythmes circadiens changent avec l&rsquo;\u00e2ge. De nouvelles recherches sugg\u00e8rent que cela est d\u00fb \u00e0 l&rsquo;action de g\u00e8nes jusqu&rsquo;alors inconnus. La plupart des personnes qui ont des parents \u00e2g\u00e9s ont remarqu\u00e9 qu&rsquo;ils vivent selon un rythme diff\u00e9rent. Les personnes \u00e2g\u00e9es ont tendance \u00e0 se coucher t\u00f4t, \u00e0 se lever [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":24156,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[259,255,239],"tags":[],"class_list":{"0":"post-58324","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-sante-mentale","8":"category-sommeil","9":"category-vieillissement","10":"entry"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.4 (Yoast SEO v23.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Des g\u00e8nes r\u00e9cemment d\u00e9couverts entra\u00eenent une modification des rythmes circadiens avec l&#039;\u00e2ge &#8211; Chronobiology.com<\/title>\n<meta name=\"description\" content=\"Doctors have long noted that circadian rhythms change as we age. 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