Project acronym ComplexSex
Project Sex-limited experimental evolution of natural and novel sex chromosomes: the role of sex in shaping complex traits
Researcher (PI) Jessica Abbott
Host Institution (HI) LUNDS UNIVERSITET
Call Details Starting Grant (StG), LS8, ERC-2015-STG
Summary The origin and evolution of sexual reproduction and sex differences represents one of the major unsolved problems in evolutionary biology, and although much progress had been made both via theory and empirical research, recent data suggest that sex chromosome evolution may be more complex than previously thought. The concept of sexual antagonism (when there is a positive intersexual genetic correlation in trait expression but opposite fitness effects of the trait(s) in males and females) has become essential to our understanding of sex chromosome evolution. The goal of this proposal is to understand how the interacting effects of sexual antagonism, sex-linked genetic variation, and sex-specific selection shape the genetic architecture of complex traits. I will test the hypotheses that: 1) individual sexually antagonistic loci are common in the genome, both in separate-sexed species and in hermaphrodites, and drive patterns of sexual antagonism often seen on the trait level. 2) That the response to sex-specific selection in sex-linked loci is usually due to standing sexually antagonistic genetic variation. 3) That sexually antagonistic variation is primarily non-additive in nature. To accomplish this, I will use a combination of approaches, including sex-limited experimental evolution of the X chromosome and reciprocal sex chromosome introgression among distantly related populations of Drosophila, quantitative genetic analysis and experimental evolution mimicking the creation of a novel sex chromosome in the hermaphroditic flatworm Macrostomum, and analytical and simulation modeling. This project will serve to confirm or refute the assumption that trait-level sexual antagonism reflects the contributions of many individual sexually antagonistic loci, increase our understanding of the contribution of coevolution of the sex chromosomes to population divergence, and help provide us with a better general understanding of how genotype maps to phenotype.
Summary
The origin and evolution of sexual reproduction and sex differences represents one of the major unsolved problems in evolutionary biology, and although much progress had been made both via theory and empirical research, recent data suggest that sex chromosome evolution may be more complex than previously thought. The concept of sexual antagonism (when there is a positive intersexual genetic correlation in trait expression but opposite fitness effects of the trait(s) in males and females) has become essential to our understanding of sex chromosome evolution. The goal of this proposal is to understand how the interacting effects of sexual antagonism, sex-linked genetic variation, and sex-specific selection shape the genetic architecture of complex traits. I will test the hypotheses that: 1) individual sexually antagonistic loci are common in the genome, both in separate-sexed species and in hermaphrodites, and drive patterns of sexual antagonism often seen on the trait level. 2) That the response to sex-specific selection in sex-linked loci is usually due to standing sexually antagonistic genetic variation. 3) That sexually antagonistic variation is primarily non-additive in nature. To accomplish this, I will use a combination of approaches, including sex-limited experimental evolution of the X chromosome and reciprocal sex chromosome introgression among distantly related populations of Drosophila, quantitative genetic analysis and experimental evolution mimicking the creation of a novel sex chromosome in the hermaphroditic flatworm Macrostomum, and analytical and simulation modeling. This project will serve to confirm or refute the assumption that trait-level sexual antagonism reflects the contributions of many individual sexually antagonistic loci, increase our understanding of the contribution of coevolution of the sex chromosomes to population divergence, and help provide us with a better general understanding of how genotype maps to phenotype.
Max ERC Funding
1 492 011 €
Duration
Start date: 2016-05-01, End date: 2021-04-30
Project acronym ComplexSwimmers
Project Biocompatible and Interactive Artificial Micro- and Nanoswimmers and Their Applications
Researcher (PI) Giovanni Volpe
Host Institution (HI) GOETEBORGS UNIVERSITET
Call Details Starting Grant (StG), PE4, ERC-2015-STG
Summary Microswimmers, i.e., biological and artificial microscopic objects capable of self-propulsion, have been attracting a growing interest from the biological and physical communities. From the fundamental side, their study can shed light on the far-from-equilibrium physics underlying the adaptive and collective behavior of biological entities such as chemotactic bacteria and eukaryotic cells. From the more applied side, they provide tantalizing options to perform tasks not easily achievable with other available techniques, such as the targeted localization, pick-up and delivery of microscopic and nanoscopic cargoes, e.g., in drug delivery, bioremediation and chemical sensing.
However, there are still several open challenges that need to be tackled in order to achieve the full scientific and technological potential of microswimmers in real-life settings. The main challenges are: (1) to identify a biocompatible propulstion mechanism and energy supply capable of lasting for the whole particle life-cycle; (2) to understand their behavior in complex and crowded environments; (3) to learn how to engineer emergent behaviors; and (4) to scale down their dimensions towards the nanoscale.
This project aims at tackling these challenges by developing biocompatible microswimmers capable of elaborate behaviors, by engineering their performance when interacting with other particles and with a complex environment, and by developing working nanoswimmers.
To achieve these goals, we have laid out a roadmap that will lead us to push the frontiers of the current understanding of active matter both at the mesoscopic and at the nanoscopic scale, and will permit us to develop some technologically disruptive techniques, namely, targeted delivery of cargoes within complex environments, which is of interest for drug delivery and bioremediation, and efficient sorting of chiral nanoparticles, which is of interest for biomedical and pharmaceutical applications.
Summary
Microswimmers, i.e., biological and artificial microscopic objects capable of self-propulsion, have been attracting a growing interest from the biological and physical communities. From the fundamental side, their study can shed light on the far-from-equilibrium physics underlying the adaptive and collective behavior of biological entities such as chemotactic bacteria and eukaryotic cells. From the more applied side, they provide tantalizing options to perform tasks not easily achievable with other available techniques, such as the targeted localization, pick-up and delivery of microscopic and nanoscopic cargoes, e.g., in drug delivery, bioremediation and chemical sensing.
However, there are still several open challenges that need to be tackled in order to achieve the full scientific and technological potential of microswimmers in real-life settings. The main challenges are: (1) to identify a biocompatible propulstion mechanism and energy supply capable of lasting for the whole particle life-cycle; (2) to understand their behavior in complex and crowded environments; (3) to learn how to engineer emergent behaviors; and (4) to scale down their dimensions towards the nanoscale.
This project aims at tackling these challenges by developing biocompatible microswimmers capable of elaborate behaviors, by engineering their performance when interacting with other particles and with a complex environment, and by developing working nanoswimmers.
To achieve these goals, we have laid out a roadmap that will lead us to push the frontiers of the current understanding of active matter both at the mesoscopic and at the nanoscopic scale, and will permit us to develop some technologically disruptive techniques, namely, targeted delivery of cargoes within complex environments, which is of interest for drug delivery and bioremediation, and efficient sorting of chiral nanoparticles, which is of interest for biomedical and pharmaceutical applications.
Max ERC Funding
1 497 500 €
Duration
Start date: 2016-09-01, End date: 2021-08-31
Project acronym HeteroDynamic
Project Evolutionary Stability of Ubiquitous Root Symbiosis
Researcher (PI) Anna Rosling Larsson
Host Institution (HI) UPPSALA UNIVERSITET
Call Details Starting Grant (StG), LS8, ERC-2015-STG
Summary Virtually all terrestrial plants depend on symbiotic interactions with fungi. Arbuscular mycorrhizal (AM) fungi evolved over 450 million years ago, are obligate biotrophs and cannot complete their lifecycle without obtaining carbon from host roots. Mediating nutrient uptake and sequestering carbon in soil this symbiosis lie at the core of all terrestrial ecosystems. Plants on the other hand are facultative mycotrophs but under natural conditions all host roots are colonized as a result of multiple beneficial effects of AM fungi. In the symbiosis, both plants and fungi are promiscuous, forming interactions across individuals and species. In the absence of host-symbiont specificity and given their inability to discriminate among partners prior to interaction, evolutionary theory predicts that “free riders” would evolve and spread. Yet AM fungi remain evolutionary and ecologically successful. I propose that this is thanks to their unique genomic organization, a temporally dynamic heterokaryosis.
Unlike other eukaryotes, AM fungi have no single nucleate stage in their life cycle, instead they reproduce asexually by forming large multinucleate spores. Genetic variation is high and nuclei can migrate and mix within extensive mycelial networks. My group has recently established a single nucleus genomics method to study genetic variation among nuclei within AM fungi. With this method I can resolve the extent of heterokaryosis in AM fungi and its temporal dynamics. I will study the emergence of “free riders” upon intra organismal segregation of genetically distinct nuclei during AM fungal adaptation to host. Further I will study how hyphal fusion and nuclear mixing counteract segregation to stabilize the symbiosis. The research program has great potential for novel discoveries of fundamental importance to evolutionary and environmental biology and will also contribute to agricultural practice and management of terrestrial ecosystems.
Summary
Virtually all terrestrial plants depend on symbiotic interactions with fungi. Arbuscular mycorrhizal (AM) fungi evolved over 450 million years ago, are obligate biotrophs and cannot complete their lifecycle without obtaining carbon from host roots. Mediating nutrient uptake and sequestering carbon in soil this symbiosis lie at the core of all terrestrial ecosystems. Plants on the other hand are facultative mycotrophs but under natural conditions all host roots are colonized as a result of multiple beneficial effects of AM fungi. In the symbiosis, both plants and fungi are promiscuous, forming interactions across individuals and species. In the absence of host-symbiont specificity and given their inability to discriminate among partners prior to interaction, evolutionary theory predicts that “free riders” would evolve and spread. Yet AM fungi remain evolutionary and ecologically successful. I propose that this is thanks to their unique genomic organization, a temporally dynamic heterokaryosis.
Unlike other eukaryotes, AM fungi have no single nucleate stage in their life cycle, instead they reproduce asexually by forming large multinucleate spores. Genetic variation is high and nuclei can migrate and mix within extensive mycelial networks. My group has recently established a single nucleus genomics method to study genetic variation among nuclei within AM fungi. With this method I can resolve the extent of heterokaryosis in AM fungi and its temporal dynamics. I will study the emergence of “free riders” upon intra organismal segregation of genetically distinct nuclei during AM fungal adaptation to host. Further I will study how hyphal fusion and nuclear mixing counteract segregation to stabilize the symbiosis. The research program has great potential for novel discoveries of fundamental importance to evolutionary and environmental biology and will also contribute to agricultural practice and management of terrestrial ecosystems.
Max ERC Funding
1 500 000 €
Duration
Start date: 2016-04-01, End date: 2021-03-31
Project acronym Optimal-Immunity
Project Optimal diversity in immunity – to overcome pathogens and maximize fitness; moving from correlative associations to a more mechanistic understanding using wild songbirds.
Researcher (PI) Karin Helena Westerdahl
Host Institution (HI) LUNDS UNIVERSITET
Call Details Starting Grant (StG), LS8, ERC-2015-STG
Summary The Major Histocompatibility Complex (MHC) genes are intensively studied genes in association with disease resistance. MHC proteins are essential for initiating every adaptive immune response and MHC is probably the most extreme example of how selection from a wide range of pathogens maintains high diversity in host immunity genes. However, the functions of the MHC proteins are only known in humans and model organisms, species that cannot be studied under natural conditions. There is therefore a need to study function of MHC proteins in species that can be thoroughly monitored in their natural habitat under varying pathogen regimes and over several generations. These parameters can be assessed in wild songbirds making them excellent study systems. Songbirds have large numbers of MHC gene copies, although little is known about how these affect their immune responses. Does high MHC copy number indicate that songbirds can recognize and combat more pathogens than other animals? They do fight infections satisfactory at their breeding, stopover and overwintering sites.
In this proposal my overarching aim is a more mechanistic understanding for survival and fitness linked to MHC in animals from wild populations and to take this field of research beyond the simple correlative associations that hitherto have been the rule. To reach this goal I must first characterize songbird MHC, now possible with ‘single molecule real time sequencing’. Therefore a rather substantial part of this proposal is technology. I will use two different songbird study systems; long-distance migratory great reed warblers and sedentary house sparrows and malaria-like pathogens infecting both these species. I am an experienced researcher on MHC and together with my team I will (1) characterize the MHC genomic region, (2) measure expression of MHC genes, (3) build MHC proteins and (4) measure functional MHC diversity in relation to fitness in wild birds, both in nature and in experimental set-ups.
Summary
The Major Histocompatibility Complex (MHC) genes are intensively studied genes in association with disease resistance. MHC proteins are essential for initiating every adaptive immune response and MHC is probably the most extreme example of how selection from a wide range of pathogens maintains high diversity in host immunity genes. However, the functions of the MHC proteins are only known in humans and model organisms, species that cannot be studied under natural conditions. There is therefore a need to study function of MHC proteins in species that can be thoroughly monitored in their natural habitat under varying pathogen regimes and over several generations. These parameters can be assessed in wild songbirds making them excellent study systems. Songbirds have large numbers of MHC gene copies, although little is known about how these affect their immune responses. Does high MHC copy number indicate that songbirds can recognize and combat more pathogens than other animals? They do fight infections satisfactory at their breeding, stopover and overwintering sites.
In this proposal my overarching aim is a more mechanistic understanding for survival and fitness linked to MHC in animals from wild populations and to take this field of research beyond the simple correlative associations that hitherto have been the rule. To reach this goal I must first characterize songbird MHC, now possible with ‘single molecule real time sequencing’. Therefore a rather substantial part of this proposal is technology. I will use two different songbird study systems; long-distance migratory great reed warblers and sedentary house sparrows and malaria-like pathogens infecting both these species. I am an experienced researcher on MHC and together with my team I will (1) characterize the MHC genomic region, (2) measure expression of MHC genes, (3) build MHC proteins and (4) measure functional MHC diversity in relation to fitness in wild birds, both in nature and in experimental set-ups.
Max ERC Funding
1 498 732 €
Duration
Start date: 2016-04-01, End date: 2021-03-31
Project acronym SINCAT
Project Single Nanoparticle Catalysis
Researcher (PI) Christoph Langhammer
Host Institution (HI) CHALMERS TEKNISKA HOEGSKOLA AB
Call Details Starting Grant (StG), PE4, ERC-2015-STG
Summary Imagine a sustainable society where clean energy is produced from sunlight, and water is converted into hydrogen to fuel a fuel cell, which produces electric energy to power the electric motor in a car. At the same time, CO2 emissions are captured and converted to hydrocarbons that are again used as fuel or as resource for fine chemical synthesis. At the heart of this vision is heterogeneous catalysis. Hence, for it to become reality, tailored highly efficient catalyst materials are of paramount importance. The goal of this research program is therefore to establish a new experimental paradigm, which allows the detailed scrutiny of individual catalyst nanoparticles and their reaction products under application conditions.
The catalytic performance of nanoparticles is directly controlled by their size, shape and chemical composition. Current studies are, however, conducted on ensembles of nanoparticles. Therefore, such studies are plagued by averaging effects, which deny access to the key details related to how size, shape and composition control catalyst performance. To eliminate this problem, we will nanofabricate a unique nanofluidic reactor device that will enable us to scrutinize catalytic processes and products at the individual catalyst nanoparticle level. In a second step, we will integrate plasmonic optical probes with the nanoreactor to be able to simultaneously monitor the dynamics of the catalyst particle state during reaction.
Finally, we will apply the nanoreactor to investigate the role of the catalyst oxidation state in Fischer-Tropsch catalysis. In parallel, we will explore novel plasmon-induced hot electron-mediated reaction pathways for catalytic CO2 reduction, as part of a carbon-neutral energy cycle. We anticipate unprecedented insight into the role of catalyst particle state, size and shape in these processes. This will facilitate the development of more efficient catalyst materials in the quest for an energy-efficient and sustainable future.
Summary
Imagine a sustainable society where clean energy is produced from sunlight, and water is converted into hydrogen to fuel a fuel cell, which produces electric energy to power the electric motor in a car. At the same time, CO2 emissions are captured and converted to hydrocarbons that are again used as fuel or as resource for fine chemical synthesis. At the heart of this vision is heterogeneous catalysis. Hence, for it to become reality, tailored highly efficient catalyst materials are of paramount importance. The goal of this research program is therefore to establish a new experimental paradigm, which allows the detailed scrutiny of individual catalyst nanoparticles and their reaction products under application conditions.
The catalytic performance of nanoparticles is directly controlled by their size, shape and chemical composition. Current studies are, however, conducted on ensembles of nanoparticles. Therefore, such studies are plagued by averaging effects, which deny access to the key details related to how size, shape and composition control catalyst performance. To eliminate this problem, we will nanofabricate a unique nanofluidic reactor device that will enable us to scrutinize catalytic processes and products at the individual catalyst nanoparticle level. In a second step, we will integrate plasmonic optical probes with the nanoreactor to be able to simultaneously monitor the dynamics of the catalyst particle state during reaction.
Finally, we will apply the nanoreactor to investigate the role of the catalyst oxidation state in Fischer-Tropsch catalysis. In parallel, we will explore novel plasmon-induced hot electron-mediated reaction pathways for catalytic CO2 reduction, as part of a carbon-neutral energy cycle. We anticipate unprecedented insight into the role of catalyst particle state, size and shape in these processes. This will facilitate the development of more efficient catalyst materials in the quest for an energy-efficient and sustainable future.
Max ERC Funding
1 500 000 €
Duration
Start date: 2016-01-01, End date: 2020-12-31
