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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.

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

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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