Project description DEENESFRITPL Mechanistic insight into genomic exclusion Hybridogenesis is an unusual form of reproduction that combines elements from asexual and sexual reproduction. It usually takes place in organisms that are hybrids of other species and involves the selective transmission of one of the parental genomes to future generations. The key objective of the EU-funded SEXY project is to understand the molecular mechanism of selective genomic exclusion. Researchers will employ Bacillus stick insects as a model system and study potential genomic loci and maternal factors that may impact the process of genomic exclusion. Results will help understand how the intriguing process of hybridogenesis has evolved in certain species. Show the project objective Hide the project objective Objective Selfish genetic elements increase their transmission at the expense of others. The ultimate reasons for their increased transmission are generally well understood. However, the molecular mechanisms driving their transmission above the Mendelian 50/50 ratio are poorly understood, especially in the case of selective exclusion of entire haploid genomes. A prime example for genome exclusion is hybridogenesis: some F1 hybrid species clonally transmit one of their haploid genomes (the selfish one) by selectively eliminating the other (the so-called ‘host genome’) during gamete formation. Here, I propose to use Bacillus stick insects to elucidate the molecular innovations that enable genome exclusion and lead to the evolution of hybridogenesis in Bacillus. The Bacillus system is uniquely suited for the proposed research as it is possible to introgress genome-eliminating elements into the genetic background of a ‘normal’ sexual species. This enables identification of genomic regions associated with genome exclusion by targeted genotyping. The project will answer three key questions: I) Bacillus comprises at least two hybridogenetic species that use different host genomes: how did host genome exclusion originate (independent origin vs host switch)? II) what is the genomic basis of genome exclusion?, and III) are cytoplasmic (maternally derived) components involved in genome exclusion? The methodological repertoire will comprise haplome phasing and phylogenomics using long-read data, experimental introgression and genetic mapping, and an experimental cytoplasm switch. By combining the methodology of different disciplines we will generate a cohesive understanding of the mechanistic basis of genome exclusion in a new model organism. The project addresses general hypotheses and will serve as a blueprint for genome exclusion studies with applicative potential in medicine and agriculture. Fields of science agricultural sciencesagriculture, forestry, and fisheriesagriculturenatural sciencesbiological scienceszoologyentomologynatural sciencesbiological sciencesgeneticsgenomes Programme(s) H2020-EU.1.3. - EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions Main Programme H2020-EU.1.3.2. - Nurturing excellence by means of cross-border and cross-sector mobility Topic(s) MSCA-IF-2020 - Individual Fellowships Call for proposal H2020-MSCA-IF-2020 See other projects for this call Funding Scheme MSCA-IF-EF-ST - Standard EF Coordinator UNIVERSITE DE LAUSANNE Net EU contribution € 191 149,44 Address QUARTIER UNIL CENTRE - BATIMENT UNICENTRE 1015 LAUSANNE Switzerland See on map Region Schweiz/Suisse/Svizzera Région lémanique Vaud Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Total cost € 191 149,44
