%0 Journal Article %J Frontiers in Microbiology %D 2020 %T Evolutionary mechanisms of long-term genome diversification associated with niche partitioning in marine picocyanobacteria %A Doré, Hugo %A Farrant, Gregory K. %A Guyet, Ulysse %A Haguait, Julie %A Humily, Florian %A Ratin, Morgane %A Pitt, Frances D. %A Ostrowski, Martin %A Six, Christophe %A Brillet-Guéguen, Loraine %A Hoebeke, Mark %A Bisch, Antoine %A Le Corguillé, Gildas %A Corre, Erwan %A Labadie, Karine %A Aury, Jean-Marc %A Wincker, Patrick %A Choi, Dong Han %A Noh, Jae Hoon %A Eveillard, Damien %A Scanlan, David J. %A Partensky, Frédéric %A Garczarek, Laurence %K amino-acid substitutions %K comparative genomics %K evolution %K genomic islands %K marine cyanobacteria %K niche adaptation %K Prochlorococcus %K rcc1084 %K RCC1085 %K RCC1086 %K RCC1087 %K RCC156 %K RCC158 %K rcc162 %K RCC2033 %K RCC2035 %K RCC2319 %K RCC2366 %K RCC2368 %K RCC2369 %K RCC2374 %K RCC2376 %K RCC2378 %K RCC2379 %K rcc2380 %K RCC2381 %K rcc2382 %K RCC2383 %K RCC2385 %K RCC2433 %K RCC2436 %K RCC2438 %K RCC2527 %K RCC2528 %K RCC2533 %K RCC2534 %K RCC2535 %K RCC2553 %K RCC2554 %K RCC2555 %K RCC2556 %K RCC2571 %K RCC2673 %K RCC278 %K rcc296 %K RCC307 %K RCC328 %K RCC3377 %K RCC407 %K RCC515 %K rcc539 %K rcc555 %K RCC556 %K rcc752 %K RCC753 %K rcc791 %K Synechococcus %B Frontiers in Microbiology %V 11 %P 1–23 %8 sep %G eng %U https://www.frontiersin.org/article/10.3389/fmicb.2020.567431/full %R 10.3389/fmicb.2020.567431 %0 Journal Article %J Algal Research %D 2019 %T Screening of marine microalgae: Investigation of new exopolysaccharide producers %A Gaignard, C. %A Laroche, C. %A Pierre, G. %A Dubessay, P. %A Delattre, C. %A Gardarin, C. %A Gourvil, P. %A Probert, I. %A Dubuffet, A. %A Michaud, P. %K rcc1084 %K RCC1196 %K RCC1504 %K RCC1714 %K RCC1774 %K RCC1786 %K RCC1863 %K RCC1978 %K RCC1983 %K RCC2035 %K RCC232 %K RCC2350 %K RCC2352 %K RCC2368 %K rcc2380 %K RCC2381 %K RCC2383 %K RCC2436 %K RCC2558 %K RCC2598 %K RCC2608 %K RCC2614 %K RCC2624 %K RCC2638 %K RCC269 %K RCC2696 %K RCC2703 %K RCC2932 %K RCC3069 %K RCC3072 %K RCC3092 %K RCC3093 %K RCC3436 %K RCC3649 %K RCC377 %K RCC4094 %K RCC4438 %K RCC4555 %K RCC4621 %K RCC4631 %K RCC4657 %K RCC76 %K RCC775 %K RCC821 %K RCC97 %X Biopolymers, such as exopolysaccharides are widely exploited by industry as hydrocolloids (gelling, thickening agents) and biological agents (anti-inflammatory, anti-parasitic, antioxidant, etc.). In this study, 166 marine microalgae and cyanobacteria species have been screened in order to identify strains producing original exopolysaccharides. This screening allowed the highlighting of 45 positive strains. In a second time, the monosaccharide compositions from 20 EPS of them were determined by GC/MS and HPAEC-PAD. The results led to a discovery of 8 new genera of microalgae producing EPS, including polymers with a very original composition like richness in GlcA. Finally, a phylogenic tree has been contructed in order to assess the link between the phylogeny of microalgae and the global composition of their exopolymers, based on data obtained in this study and from the literature. %B Algal Research %V 44 %P 101711 %8 dec %G eng %U https://www.sciencedirect.com/science/article/pii/S2211926419303261 https://linkinghub.elsevier.com/retrieve/pii/S2211926419303261 %R 10.1016/j.algal.2019.101711 %0 Journal Article %J Proceedings of the National Academy of Sciences %D 2018 %T Light color acclimation is a key process in the global ocean distribution of Synechococcus cyanobacteria %A Grébert, Théophile %A Doré, Hugo %A Partensky, Frédéric %A Farrant, Gregory K. %A Boss, Emmanuel S. %A Picheral, Marc %A Guidi, Lionel %A Pesant, Stéphane %A Scanlan, David J. %A Wincker, Patrick %A Acinas, Silvia G. %A Kehoe, David M. %A Garczarek, Laurence %K 2018 %K RCC1016 %K RCC1017 %K RCC1018 %K RCC1020 %K RCC1023 %K RCC1027 %K RCC1030 %K RCC1031 %K rcc1084 %K RCC1085 %K RCC1086 %K RCC1087 %K RCC1096 %K RCC1097 %K RCC1649 %K RCC1661 %K RCC1688 %K RCC2032 %K RCC2033 %K RCC2035 %K RCC2319 %K RCC2366 %K RCC2368 %K RCC2369 %K RCC2370 %K RCC2372 %K RCC2373 %K RCC2374 %K RCC2375 %K RCC2376 %K RCC2378 %K RCC2379 %K rcc2380 %K RCC2381 %K rcc2382 %K RCC2383 %K RCC2384 %K RCC2385 %K RCC2415 %K RCC2432 %K RCC2433 %K RCC2434 %K RCC2435 %K RCC2436 %K RCC2437 %K RCC2438 %K RCC2457 %K RCC2525 %K RCC2526 %K RCC2527 %K RCC2528 %K RCC2529 %K RCC2530 %K RCC2532 %K RCC2533 %K RCC2534 %K RCC2536 %K RCC2553 %K RCC2554 %K RCC2555 %K RCC2556 %K RCC2567 %K RCC2568 %K RCC2569 %K RCC2570 %K RCC2571 %K RCC2673 %K rcc30 %K RCC3010 %K RCC3012 %K RCC3014 %K RCC307 %K RCC316 %K RCC318 %K RCC325 %K RCC326 %K RCC328 %K RCC37 %K RCC44 %K RCC46 %K RCC47 %K RCC515 %K rcc539 %K RCC542 %K RCC543 %K RCC550 %K RCC552 %K RCC553 %K rcc555 %K RCC556 %K RCC557 %K RCC558 %K RCC559 %K RCC62 %K RCC650 %K RCC66 %K rcc752 %K RCC753 %K RCC790 %K rcc791 %K RCC792 %K RCC793 %K RCC794 %K sbr?hyto?app %X Marine Synechococcus cyanobacteria are major contributors to global oceanic primary production and exhibit a unique diversity of photosynthetic pigments, allowing them to exploit a wide range of light niches. However, the relationship between pigment content and niche partitioning has remained largely undetermined so far due to the lack of a single-genetic marker resolving all pigment types (PT). Here, we developed a novel and robust method based on three distinct marker genes to estimate the relative abundance of all Synechococcus PTs from metagenomes. Analysis of the Tara Oceans dataset allowed us to unveil for the first time the global distribution of Synechococcus PTs and to decipher their realized environmental niches. Green-light specialists (PT 3a) dominated in warm, green equatorial waters, whereas blue-light specialists (PT 3c) were particularly abundant in oligotrophic areas. Type IV chromatic acclimaters (CA4-A/B), which are able to dynamically modify their light absorption properties to maximally absorb green or blue light, were unexpectedly the most abundant PT in our dataset and predominated at depth and high latitudes. We also identified local populations in which CA4 might be inactive due to the lack of specific CA4 genes, notably in warm high nutrient low chlorophyll areas. Major ecotypes within clades I-IV and CRD1 were preferentially associated with a particular PT, while others exhibited a wide range of PTs. Altogether, this study brings unprecedented insights into the ecology of Synechococcus PTs and highlights the complex interactions between vertical phylogeny, pigmentation and environmental parameters that shape Synechococcus populations and evolution. %B Proceedings of the National Academy of Sciences %V in press %P 201717069 %8 feb %G eng %U http://www.pnas.org/lookup/doi/10.1073/pnas.1717069115 %R 10.1073/pnas.1717069115