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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.

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

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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