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PLAST-EVOL SIGNED

The origin and early evolution of eukaryotic plastids

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EC-Contrib. €

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Partnership

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 PLAST-EVOL project word cloud

Explore the words cloud of the PLAST-EVOL project. It provides you a very rough idea of what is the project "PLAST-EVOL" about.

culture    single    found    secondary    active    metagenomic    origin    modern    argue    data    branching    history    endosymbioses    symbiosis    unknown    red    phylogenomic    plant    lithophora    fixation    biogeochemical    genomes    profound    cyanobacterial    concomitant    gloeomargaritales    photosynthesis    planet    species    producers    tertiary    carbonates    discovered    eukaryotes    newly    hypothesis    obscure    endosymbiosis    plants    regulation    tree    spread    green    host    became    algal    cell    unusual    genomic    initial    retrace    primary    buffering    ancient    eukaryote    isolated    later    evolutionary    ga    hypothesize    allowed    glaucophytes    group    transferred    photosynthetic    successful    plastid    mystery    capacity    remnants    belonged    until    algae    amorphous    deep    original    phyla    ago    more    players    nuclear    physiology    eukaryotic    plastids    first    intracellular    evolution    endosymbiotically    ph    obtain    life    heterotrophic    identity    gain    biology    genes    diverse    had    thoroughly    subsequent    gloeomargarita    engulfing    cyanobacterium    influence   

Project "PLAST-EVOL" data sheet

The following table provides information about the project.

Coordinator
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS 

Organization address
address: RUE MICHEL ANGE 3
city: PARIS
postcode: 75794
website: www.cnrs.fr

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country France [FR]
 Total cost 2˙499˙986 €
 EC max contribution 2˙499˙986 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2017-ADG
 Funding Scheme ERC-ADG
 Starting year 2018
 Duration (year-month-day) from 2018-10-01   to  2023-09-30

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS FR (PARIS) coordinator 2˙499˙986.00

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 Project objective

More than 1 Ga ago, an ancient eukaryote became photosynthetic by engulfing a cyanobacterium that evolved into the first plastid. This had profound consequences for the planet: photosynthetic eukaryotes became major primary producers and biogeochemical players. From this primary endosymbiosis evolved green algae and plants, red algae, and glaucophytes. Later, secondary endosymbioses of red and green algae spread plastids in numerous other phyla. However, many aspects of this evolutionary history remain obscure. The identity of that cyanobacterium was a mystery until we recently found strong phylogenomic evidence that it belonged to the Gloeomargaritales, a newly discovered deep-branching group. Yet, why this original endosymbiosis in a heterotrophic host was so successful is unknown. I hypothesize that it was due to the unusual capacity of Gloeomargaritales to produce intracellular carbonates which, I argue, allowed buffering the pH increase concomitant with photosynthetic C fixation. This was crucial for photosynthesis-based endosymbiosis before the host evolved active pH regulation. Similar intracellular amorphous carbonates recently found in green algae might be modern remnants of that initial symbiosis. To test this hypothesis and gain insight into the origin and subsequent evolution of plastids, I propose to: 1) thoroughly characterize the physiology of Gloeomargarita lithophora, the only Gloeomargaritales species isolated so far; 2) obtain new genomic data from diverse Gloeomargaritales by culture, metagenomic and single-cell approaches; 3) study the impact of cyanobacterial genes endosymbiotically transferred to the host algal and plant nuclear genomes; and 4) retrace the evolutionary history of these genes in secondary and tertiary endosymbioses. My project will improve our understanding of the origin and evolution of photosynthetic eukaryotes, and influence broader evolutionary biology research areas, from endosymbiosis to the eukaryotic tree of life.

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