Des chercheurs du laboratoire de Noah Fierer à l’Université de Boulder (Colorado, USA), en collaboration avec des chercheurs de l’Institut Pasteur, ont montré l’existence des nombreux ARNr (ARN ribosomaux) « non-liés », c’est-à-dire, des ARNr qui ne s’organisent pas de façon traditionnelle et qui se trouvent dispersés dans les génomes des bactéries et des archées. Les analyses bioinformatiques ont montré que ces rRNA non-liés étaient associés à des organismes ayant des temps de génération très long et des espèces intracellulaires. En outre, des analyses de métagénomique ont révélé que ces rRNA étaient surreprésentés dans des environnements terrestres et totalement absents dans d’autres environnements, telles que l’intestin humain. Cela suggère que ces rRNA pourraient donner un avantage dans certains environnements, même si ces avantages restent encore à être identifier.
Pour plus d’information : Unlinked rRNA genes are widespread among bacteria and archaea. Brewer TE, Albertsen M, Edwards A, Kirkegaard RH, Rocha EPC, Fierer N. ISME J. 2019 Nov 11. doi: 10.1038/s41396-019-0552-3.
Le journal Frontiers in Ecology and Evolution est un train de préparer deux numéros spéciaux qui pourraient intéresser notre communauté :
- Symbiotic Relationships as Shapers of Biodiversity
Date limite pour l’envoi d’un résumé : 05/01/2020 ; Date limite pour l’article : 04/05/2020
Pour plus d’information : https://www.frontiersin.org/research-topics/12122/symbiotic-relationships-as-shapers-of-biodiversity - The Role of Mobile Genetic Elements in Bacterial Evolution and their Adaptability
Date limite pour l’envoi d’un résumé : 06/12/2019 ; Date limite pour l’article : 04/04/2020
Pour plus d’information: https://www.frontiersin.org/research-topics/11800/the-role-of-mobile-genetic-elements-in-bacterial-evolution-and-their-adaptability
Olaya RENDUELES GARCIA olaya.rendueles-garcia@pasteur.fr
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