{"id":7112,"date":"2025-06-07T22:56:48","date_gmt":"2025-06-07T20:56:48","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/etape-critique-dans-linfection-a-covid-19-identifiee-comment-le-virus-se-prete-lui-meme-pendant-la-replication\/"},"modified":"2025-06-07T22:56:59","modified_gmt":"2025-06-07T20:56:59","slug":"etape-critique-dans-linfection-a-covid-19-identifiee-comment-le-virus-se-prete-lui-meme-pendant-la-replication","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/etape-critique-dans-linfection-a-covid-19-identifiee-comment-le-virus-se-prete-lui-meme-pendant-la-replication\/","title":{"rendered":"\u00c9tape critique dans l&rsquo;infection \u00e0 Covid-19 identifi\u00e9e &#8211; comment le virus se pr\u00eate lui-m\u00eame pendant la r\u00e9plication"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/critical-step-in-covid.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/critical-step-in-covid.jpg\" data-sub-html=\"This transmission electron microscopy image shows 3a dense bodies (3DBs), the darkest parts of the image, inside a cell infected with SARS-CoV-2. 3DBs play a critical role regulating the processing of the virus's spike protein, before the spike protein is assembled into complete viral particles. Credit: Jueqi Chen\/University of Chicago\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Des chercheurs du Texas Biomedical Research Institute et de l&rsquo;Universit\u00e9 de Chicago ont d\u00e9couvert un m\u00e9canisme que SARS-COV-2, le virus qui provoque Covid-19, utilise pour se prot\u00e9ger \u00e0 l&rsquo;int\u00e9rieur du corps lorsqu&rsquo;il travaille pour reproduire et infecter plus de cellules. Sans ce m\u00e9canisme de protection, l&rsquo;infection virale est consid\u00e9rablement r\u00e9duite.<\/p>\n<p>La d\u00e9couverte, publi\u00e9e dans <i>Communications de la nature<\/i>non seulement fournit une cible potentielle pour les nouvelles th\u00e9rapies Covid-19, mais offre \u00e9galement des informations qui pourraient \u00e9clairer les vaccins futurs et le d\u00e9veloppement antiviral. L&rsquo;\u00e9tude s&rsquo;appuie sur des travaux ant\u00e9rieurs de Texas Biomed qui ont identifi\u00e9 les prot\u00e9ines virales qui sont les plus importantes pour la pathog\u00e9nicit\u00e9 du virus ou la capacit\u00e9 de provoquer une maladie.<\/p>\n<p>\u00ab\u00a0En 2021, nous avons constat\u00e9 que la prot\u00e9ine accessoire ORF3A est l&rsquo;une des prot\u00e9ines les plus importantes pour le virus et lorsque nous l&rsquo;assocons, le virus devient beaucoup moins nocif &#8211; mais nous ne savions pas pourquoi\u00a0\u00bb, a d\u00e9clar\u00e9 le scientifique du personnel de Texas Biomed, Chengjin Ye, Ph.D. \u00ab\u00a0Maintenant, en travaillant avec nos collaborateurs \u00e0 l&rsquo;Universit\u00e9 de Chicago, nous comprenons le m\u00e9canisme.\u00a0\u00bb<\/p>\n<h2>Un d\u00e9tail de s\u00e9curit\u00e9 dense<\/h2>\n<p>Plus pr\u00e9cis\u00e9ment, SARS-COV-2 ORF3A semble jouer un r\u00f4le vital dans la protection des prot\u00e9ines structurelles, notamment la prot\u00e9ine de pointe qui facilite la propagation dans d&rsquo;autres cellules, car elles sont assembl\u00e9es \u00e0 la surface des particules virales. Il le fait en conduisant la formation d&rsquo;un groupe dense de prot\u00e9ines qui entourent la prot\u00e9ine de pointe et offrent une protection pendant le transport, un peu comme les d\u00e9tails de s\u00e9curit\u00e9 prot\u00e9geant une personne ou un v\u00e9hicule blind\u00e9 transportant de l&rsquo;argent \u00e0 la banque.<\/p>\n<p>L&rsquo;\u00e9quipe de Chicago, dirig\u00e9e par le professeur adjoint Jueqi Chen, Ph.D., a qualifi\u00e9 ces complexes de protection des \u00ab\u00a0corps denses\u00a0\u00bb ou 3DB pour faire court.<\/p>\n<p>Il semble que les 3DB aident \u00e0 emp\u00eacher la coupe de la prot\u00e9ine de pointes en composants plus petits. Lorsque ORF3A est manquant, ces 3DB ne se forment pas et la prot\u00e9ine de pointe arrive souvent endommag\u00e9e, notant gravement la capacit\u00e9 du virus naissant \u00e0 infecter de nouvelles cellules.<\/p>\n<p>\u00ab\u00a0ORF3A pourrait donc \u00eatre une bonne cible pour les m\u00e9dicaments pour bloquer le virus\u00a0\u00bb, a d\u00e9clar\u00e9 le professeur Texas Biomed, Luis Martinez-Sobrido, Ph.D. \u00ab\u00a0Cette d\u00e9couverte pourrait \u00e9galement \u00eatre d\u00e9terminante pour le d\u00e9veloppement des vaccins, comme nous l&rsquo;avons illustr\u00e9 pr\u00e9c\u00e9demment.\u00a0\u00bb<\/p>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/critical-step-in-covid-1.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/critical-step-in-covid-1.jpg\" data-sub-html=\"ORF3a-mediated 3DB assembly is conserved in multiple but not all SARSr-CoVs. Credit: &lt;i&gt;Nature Communications&lt;\/i&gt; (2025). DOI: 10.1038\/s41467-025-59475-x\">\n<figure class=\"article-img text-center\">\n            <img decoding=\"async\" src=\"https:\/\/rvh-synergie.org\/actualites\/wp-content\/uploads\/2025\/06\/1749329808_569_Etape-critique-dans-linfection-a-Covid-19-identifiee-comment-le.jpg\" alt=\"\u00c9tape critique dans une infection virale covide identifi\u00e9e\" title=\"L'assemblage 3DB m\u00e9di\u00e9 par ORF3A est conserv\u00e9 dans plusieurs mais pas les SARSR. Cr\u00e9dit: Nature Communications (2025). Doi: 10.1038 \/ s41467-025-59475-x\"><br \/>\n                     <\/figure>\n<\/p><\/div>\n<\/div>\n<h2>Une \u00e9volution surprise<\/h2>\n<p>\u00c9tant donn\u00e9 que le g\u00e8ne ORF3A est pr\u00e9sent dans d&rsquo;autres coronavirus, l&rsquo;\u00e9quipe \u00e9tait curieuse si ces virus ont \u00e9galement d\u00e9clench\u00e9 la formation de 3DBS. Ils ont constat\u00e9 que les 3DB sont form\u00e9s par des coronavirus connexes port\u00e9s par les chauves-souris et les pangolins. Cependant, il \u00e9tait surprenant de constater que les sars-<\/p>\n<p>Le COV et les coronavirus trouv\u00e9s dans les civettes ne le font pas, ce qui pourrait aider \u00e0 expliquer les taux de transmission et d&rsquo;infection inf\u00e9rieurs au cours de l&rsquo;\u00e9pid\u00e9mie de SRAS 2003 par rapport \u00e0 la pand\u00e9mie Covid-19. Selon l&rsquo;Organisation mondiale de la sant\u00e9.<\/p>\n<p>La recherche est un bon exemple de collaboration multidisciplinaire: l&rsquo;expertise du Dr Chen en biologie cellulaire et microscopie \u00e0 haute r\u00e9solution a compl\u00e9t\u00e9 l&rsquo;exp\u00e9rience de la virologie et de l&rsquo;ing\u00e9nierie virale des DR. Ye et Martinez-Sobrido.<\/p>\n<p>\u00ab\u00a0Apr\u00e8s avoir identifi\u00e9 les structures 3DB et conduit les r\u00e9sidus des pi\u00e8ces ORF3A critiques pour l&rsquo;assemblage 3DB, nous avons collabor\u00e9 avec les Drs. Ye et Martinez-Sobrido pour concevoir un virus att\u00e9nu\u00e9 sans capacit\u00e9 de former 3DB\u00a0\u00bb, a d\u00e9clar\u00e9 le Dr Chen. \u00ab\u00a0Les coronavirus ont les g\u00e9nomes les plus importants parmi les virus de l&rsquo;ARN et donc l&rsquo;expertise de g\u00e9n\u00e9tique inverse des Drs. Ye et Martinez-Sobrido ont \u00e9t\u00e9 essentiels pour les \u00e9tudes fonctionnelles de 3DB pendant l&rsquo;infection.\u00a0\u00bb<\/p>\n<p>Maintenant qu&rsquo;ils ont identifi\u00e9 pourquoi ORF3A est si important, les deux laboratoires aimeraient creuser plus profond\u00e9ment et d\u00e9terminer ce qui brise la prot\u00e9ine de pointe lorsqu&rsquo;il est laiss\u00e9 non prot\u00e9g\u00e9, ce qui pourrait r\u00e9v\u00e9ler une autre avenue pour le d\u00e9veloppement th\u00e9rapeutique. Ils aimeraient \u00e9galement \u00e9tudier d&rsquo;autres variantes SARS-COV-2 pour voir si les mutations du g\u00e8ne ORF3A affectent la formation de 3DB et les taux d&rsquo;infection.<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Des chercheurs du Texas Biomedical Research Institute et de l&rsquo;Universit\u00e9 de Chicago ont d\u00e9couvert un<\/p>\n","protected":false},"author":1,"featured_media":7113,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[182,561,2443,44,5600,2705,539,5602,201,5601,2306,630],"class_list":["post-7112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-comment","tag-covid19","tag-critique","tag-dans","tag-etape","tag-identifiee","tag-linfection","tag-luimeme","tag-pendant","tag-prete","tag-replication","tag-virus","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u00c9tape critique dans l&#039;infection \u00e0 Covid-19 identifi\u00e9e - comment le virus se pr\u00eate lui-m\u00eame pendant la r\u00e9plication - RVH-Synergie.org<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rvh-synergie.org\/actualites\/etape-critique-dans-linfection-a-covid-19-identifiee-comment-le-virus-se-prete-lui-meme-pendant-la-replication\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c9tape critique dans l&#039;infection \u00e0 Covid-19 identifi\u00e9e - comment le virus se pr\u00eate lui-m\u00eame pendant la r\u00e9plication - RVH-Synergie.org\" \/>\n<meta property=\"og:description\" content=\"Des chercheurs du Texas Biomedical Research Institute et de l&rsquo;Universit\u00e9 de Chicago ont d\u00e9couvert un\" \/>\n<meta property=\"og:url\" content=\"https:\/\/rvh-synergie.org\/actualites\/etape-critique-dans-linfection-a-covid-19-identifiee-comment-le-virus-se-prete-lui-meme-pendant-la-replication\/\" \/>\n<meta property=\"og:site_name\" content=\"RVH-Synergie\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-07T20:56:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-07T20:56:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/rvh-synergie.org\/actualites\/wp-content\/uploads\/2025\/06\/1749329809_Etape-critique-dans-linfection-a-Covid-19-identifiee-comment-le-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"2560\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Charles Martinez\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Charles Martinez\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/rvh-synergie.org\/actualites\/etape-critique-dans-linfection-a-covid-19-identifiee-comment-le-virus-se-prete-lui-meme-pendant-la-replication\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/rvh-synergie.org\/actualites\/etape-critique-dans-linfection-a-covid-19-identifiee-comment-le-virus-se-prete-lui-meme-pendant-la-replication\/\"},\"author\":{\"name\":\"Charles Martinez\",\"@id\":\"https:\/\/rvh-synergie.org\/actualites\/#\/schema\/person\/aa5ea98671fb4e8620f488a0795d2560\"},\"headline\":\"\u00c9tape critique dans l&rsquo;infection \u00e0 Covid-19 identifi\u00e9e &#8211; 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