ERC FUNDED PROJECTS

"Mutation and recombination are fundamental biological processes that determine adaptability of populations. The mutation rate reflects the equilibrium between the need to adapt, the burden of mutation load, the “cost of fidelity”, and random drift that determines a lower limit in achievable fidelity. Recombination fulfills an essential mechanistic role during meiosis, ensuring proper chromosomal segregation. Recombination affects the rate of creation and loss of favorable haplotypes, imposing 2nd-order selection pressure on modifiers of recombination. It is becoming apparent that recombination and mutation rates vary between individuals, and that these differences are in part inherited. Both processes are therefore “evolvable”, and amenable to genomic analysis. Identifying genetic determinants underlying these differences will provide insights in the regulation of mutation and recombination. The mutational load, and in particular the number of lethal equivalents per individual, remains poorly defined as epidemiological and molecular data yield estimates that differ by one order of magnitude. A relationship between recombination and fertility has been reported in women but awaits confirmation. Population structure (small effective population size; large harems), phenotypic data collection (systematic recording of > 50 traits on millions of cows), and large-scale SNP genotyping (for genomic selection), make cattle populations uniquely suited for genetic analysis. DAMONA proposes to exploit these unique resources, combined with recent advances in next generation sequencing and genotyping, to: (i) quantify and characterize inter-individual variation in male and female mutation and recombination rates, (ii) map, fine-map and identify causative genes underlying QTL for these four phenotypes, (iii) test the effect of loss-of-function variants on >50 traits including fertility, and (iv) study the effect of variation in recombination on fertility."

2 258 000 €

Start date: 2013-03-01, End date: 2018-02-28

Oriented cell divisions dictate morphogenesis by shaping tissues and organs of multicellular organisms. Oriented cell divisions have profound influence in plants because their cell positions are locked by shared cell walls. A relay of cell divisions involving precise division plane switches determines embryonic body plan, organ layout and organ architecture in plants. Cell division planes in plants are specified by reorganization of premitotic cortical microtubule array and how this occurs is a long-standing key question. My recent results establish, for the first time in plants, an in vivo inducible and traceable, precise 90º cell division plane switch system. With this system I identified a pathway that proceeds from transcriptional activation through a signaling module all the way to the activation of microtubule regulators that orchestrate switches in premitotic microtubule organization and cell division planes. My findings provide a first paradigm in plants of how genetic circuitry patterns cell division planes via feeding onto cellular machinery and pave the way for unraveling mechanistic control of cell division plane switch. By establishing a precise cell division plane switch system I am in a unique position to answer: 1. What transcriptional program and molecular players control premitotic microtubule reorganization? 2. Which mechanisms switch premitotic microtubule array? 3. What influence do identified players and mechanisms have on different types of oriented cell divisions in plants? For this I propose a systematic research plan combining (i) forward genetics and expression profile screens for identifying a suite of microtubule regulators, (ii) state-of-the-art microscopy and modeling approaches for uncovering mechanisms of their actions and (iii) their tissue-specific manipulations to modify plant form. By unraveling players and mechanisms this proposal shall resolve regulation of oriented cell divisions and expand plant engineering toolbox.

1 500 000 €

Start date: 2013-01-01, End date: 2017-12-31

"Electrochemically active bacteria enable a host of novel processes in bioproduction, bioenergy and bioremediation. Key to the success of these processes is effective adherence of the bacterial cells to an electrode surface and subsequent equally effective electron exchange with the electrode. While the cellular mechanisms for electron transfer are increasingly known, what drives bacterial adsorption and desorption to positively or negatively polarized electrodes is largely unknown. Particularly processes driven by cathodes tend to be slow, and suffer from limited microbial adherence and lack of growth of the microorganisms. ELECTROTALK aims at developing a mechanistic understanding of mobility towards and microbial adherence at surfaces, from single cell level to complete biofilm formation. Based on this knowledge, effectively catalyzed bio-electrodes will be developed for novel bioproduction processes. Such bioproduction processes, termed microbial electrosynthesis, are independent of arable land availability, promise high production densities and enable the capture of CO2 or more efficient resource-usage for a range of products. Understanding the nature of the microorganism-electrode interaction will create a window of opportunity to improve this process and achieve effective bioproduction. Moreover, as the electrical interaction directly relates to microbial activity electrodes may serve as a means to start up a conversation with the cells. To achieve our aims we will: (i) select and characterize biocatalysts both as pure cultures and microbial communities; (ii) investigate cell adherence and electron transfer in function of electrode topography and chemistry as well as under different operational conditions; (iii) develop an electrode-microorganism combination achieving effective electron transfer; and (iv) electrochemically construct biofilms with defined structure or stratification."

1 494 126 €

Start date: 2012-10-01, End date: 2017-09-30

"Even after more than one century of flight, both civil and military aircraft are still plagued by major vibration problems. A well-known example is the external-store induced flutter of the F-16 fighter aircraft. Such dynamical phenomena, commonly known as aeroelastic instabilities, result from the transfer of energy from the free stream to the structure and can lead to limit cycle oscillations, a phenomenon with no linear counterpart. Since nonlinear dynamical systems theory is not yet mature, the inherently nonlinear nature of these oscillations renders their mitigation a particularly difficult problem. The only practical solution to date is to limit aircraft flight envelope to regions where these instabilities are not expected to occur, as verified by intensive and expensive flight campaigns. This limitation results in a severe decrease in both aircraft efficiency and performance. At the heart of this project is a fundamental change in paradigm: although nonlinearity is usually seen as an enemy, I propose to control - and even suppress - aeroelastic instability through the intentional use of nonlinearity. This approach has the potential to bring about a major change in aircraft design and will be achieved thanks to the development of the nonlinear tuned vibration absorber, a new, rigorous nonlinear counterpart of the linear tuned vibration absorber. This work represents a number of significant challenges, because the novel functionalities brought by the intentional use of nonlinearity can be accompanied by adverse nonlinear dynamical effects. The successful mitigation of these unwanted nonlinear effects will be a major objective of our proposed research; it will require achieving both theoretical and technical advances to make it possible. A specific effort will be made to demonstrate experimentally the theoretical findings of this research with extensive wind tunnel testing and practical implementation of the nonlinear tuned vibration absorber. Finally, nonlinear instabilities such as limit cycle oscillations can be found in a number of non-aircraft applications including in bridges, automotive disc brakes and machine tools. The nonlinear tuned vibration absorber could also find uses in resolving problems in these applications, thus ensuring the generic character of the project."

1 316 440 €

Start date: 2012-09-01, End date: 2017-08-31