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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.

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

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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