Project description
Lessons in evolution from endosymbiosis involving algal hosts and bacterial long-term ‘guests’
Eukaryotic cells are complex miniature factories consisting of compartmentalised operations in membrane-bound organelles, among them mitochondria and chloroplasts. These energy powerhouses were likely prokaryotes that were engulfed by eukaryotes at some point, forming a symbiotic relationship. Such relationships are critical to evolution, yet the mechanisms remain largely a mystery. With the support of the Marie Skłodowska-Curie Actions programme, the UCYNELLE project is studying a recently discovered symbiosis between a bacterium and algae. A combination of experimental and field studies, genomics and metabolic rate versus cell size comparisons could shed light on the mechanisms of symbiosis and the acquisition of small organelles in eukaryotes.
Objective
Symbiosis has been key to evolution on Earth. The success of eukaryotes was possible due to the establishment of endosymbiotic relationships between unicellular microorganisms that gave rise to specialized organelles (chloroplasts and mitochondria), yet the mechanisms underpinning such biological innovations are still unresolved. An unusual marine nitrogen-fixing symbiosis involving a cyanobacterium called UCYN-A and a single-celled haptophyte algae (Braarudosphaera bigelowii) was recently found to have undergone genome rearrangements analogous to organelle evolution. Since no eukaryotes fix nitrogen (N2), an essential nutrient for life, knowledge on this peculiar symbiosis may serve as a unique opportunity for understanding the acquisition of new organelle-derived functions in eukaryotes. The UCYNELLE project is designed to provide new insights on organelle evolution through the multidisciplinary study of the UCYN-A symbiosis from an ecological, evolutionary and metabolic perspective: First, experimental manipulations with the UCYN-A culture and field surveys will be conducted to identify the molecular basis regulating the metabolic coupling between symbiotic partners and the associated microbiome. Second, the organelle genomes of the haptophyte host will be compared to those of the different UCYN-A lineages via comparative genomics to explore any parallelisms in their mode of evolution. Finally, the natural variation in cell size shown by UCYN-A and its host across different UCYN-A symbioses will allow investigating the metabolic scaling (metabolic rates vs cell size) of the N2 fixation process compared to that of typical organelle-driven metabolisms (photosynthesis and respiration) through the study of the volumetric relationships between chloroplasts, mitochondria, UCYN-A and its host. Elucidating the mechanism underlying the UCYN-A symbiosis will help to understand the early evolutionary steps leading to the acquisition of plastids in eukaryotes.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences biological sciences microbiology bacteriology
- natural sciences biological sciences evolutionary biology
- natural sciences biological sciences biological behavioural sciences ethology biological interactions
- natural sciences biological sciences genetics genomes prokaryotic genomes
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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H2020-EU.1.3. - EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions
MAIN PROGRAMME
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H2020-EU.1.3.2. - Nurturing excellence by means of cross-border and cross-sector mobility
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Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)
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Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
(opens in new window) H2020-MSCA-IF-2020
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Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.
28006 MADRID
Spain
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.