ERC FUNDED PROJECTS

Genome maintenance, chromatin remodelling and transcription are tightly linked biological processes that are currently poorly understood and vastly unexplored. Nucleotide excision repair (NER) is a major DNA repair pathway that mammalian cells employ to maintain their genome intact and faithfully transmit it into their progeny. Besides cancer and aging, however, defects in NER give rise to developmental disorders whose clinical heterogeneity and varying severity can only insufficiently be explained by the DNA repair defect. Recent work reveals that NER factors play a role, in addition to DNA repair, in transcription and the three-dimensional organization of our genome. Indeed, NER factors are now known to function in the regulation of gene expression, the transcriptional reprogramming of pluripotent stem cells and the fine-tuning of growth hormones during mammalian development. In this regard, the non-random organization of our genome, chromatin and the process of transcription itself are expected to play paramount roles in how NER factors coordinate, prioritize and execute their distinct tasks during development and disease progression. At present, however, no solid evidence exists as to how NER is functionally involved in such complex processes, what are the NER-associated protein complexes and underlying gene networks or how NER factors operate within the complex chromatin architecture. This is primarily due to our difficulties in dissecting the diverse functional contributions of NER proteins in an intact organism. Here, we propose to use a unique series of knock-in, transgenic and NER progeroid mice to decode the functional role of NER in mammals, thus paving the way for understanding how genome maintenance pathways are connected to developmental defects and disease mechanisms in vivo.

1 995 000 €

Start date: 2016-01-01, End date: 2021-06-30

Primates live in a complex social environment, in which they need to maintain track of their past social interactions and learn to formulate prediction on what specific groupmates are likely to do based on their past experiences. I have previously contributed to show that the PF (prefrontal cortex) has a main function in the generation of goals based on the current contexts and events, but its role in social cognition is still little explored. In this context, the frontal Pole cortex (FPC) has been associated to “mentalizing” functions and there is a link between the autism spectrum disorder and its abnormalities. However until recently, no one has been able to record neural activity from FPC, but us. I propose to investigate the role of the monitoring function of FPC in association to the dorsolateral (PFD) and orbitofrontal (OFC) cortex, recording from the entire network up to 256 neurons simultaneously. We have developed the first human-monkeys (H-M) paradigm to test several hypotheses. The task is a non-match-to goal (NMTG) task in which the monkeys are trained to switch from their choice on the previous trial to a different one. In a subset of trials the monkey observe a human partner (either cooperative or uncooperative) performing the task. When the human partner conclude his turn, the monkeys have to switch to a new goal discarding the human’s previous goal. I will explore the role of PFD in social decisions in predicting other agents decisions and distinguishing and categorizing cooperative and uncooperative agents, and the role of OFC in monitoring others’ choices. I expect that PFD will maintain, as it does with past and future goals, separate records for the past choices of different agents while PFO might contribute to solve credit assignment problems also in relationship to other’s behaviors.

1 028 750 €

Start date: 2016-03-01, End date: 2021-02-28

Many therapeutic applications of stem cells require accurate control of their differentiation. To this purpose there is a major ongoing effort in the development of advanced culture substrates to be used as “synthetic niches” for the cells, mimicking the native ones. The goal of this project is to use a synthetic niche cell culture model to test my revolutionary hypothesis that in stem cell differentiation, nuclear import of gene-regulating transcription factors is controlled by the stretch of the nuclear pore complexes. If verified, this idea could lead to a breakthrough in biomimetic approaches to engineering stem cell differentiation. I investigate this question specifically in mesenchymal stem cells (MSC), because they are adherent and highly mechano-sensitive to architectural cues of the microenvironment. To verify my hypothesis I will use a combined experimental-computational model of mechanotransduction. I will a) scale-up an existing three-dimensional synthetic niche culture substrate, fabricated by two-photon laser polymerization, b) characterize the effect of tridimensionality on the differentiation fate of MSC cultured in the niches, c) develop a multiphysics/multiscale computational model of nuclear import of transcription factors within differentially-spread cultured cells, and d) integrate the numerical predictions with experimentally-measured import of fluorescently-labelled transcription factors. This project requires the synergic combination of several advanced bioengineering technologies, including micro/nano fabrication and biomimetics. The use of two-photon laser polymerization for controlling the geometry of the synthetic cell niches is very innovative and will highly impact the fields of bioengineering and biomaterial technology. A successful outcome will lead to a deeper understanding of bioengineering methods to direct stem cell fate and have therefore a significant impact in tissue repair technologies and regenerative medicine.

1 903 330 €

Start date: 2015-05-01, End date: 2020-07-31

Endothelial cells (ECs) exhibit a remarkable and unique plasticity in terms of redox biology and metabolism. They can quickly adapt to oxygen, nitric oxide and metabolic variations. Therefore, EC must be equipped with a selective and unique repertoire of redox and metabolic mechanisms, that play a crucial role to preserve redox balance, and adjust metabolic conditions in both normal and pathological angiogenesis. The identification of such redox signaling and metabolic pathways is crucial to the gaining of better insights in endothelial biology and dysfunction. More importantly, these insights could be used to establish innovative therapeutic approaches for the treatment of those conditions where aberrant or excessive angiogenesis is the underlying cause of the disease itself. However, the formation, actions, key molecular interactions, and physiological and pathological relevance of redox signals in ECs remain unclear. Here, by using cutting-edge real-time redox imaging platforms, and innovative molecular and genetic approaches in different in vivo animal models, we will (1) reveal the working of redox signaling in EC in health and disease, (2) shed light on the novel role for the mevalonate metabolic pathway in angiogenesis and (3) provide solid evidence, that manipulation of endothelial redox and metabolic state by genetic alteration of the redox rheostat UBIAD1, is a valuable strategy by which to block pathological angiogenesis in vivo. The ultimate objective is to open the way for the development of innovative (cancer) therapeutic strategies and complement the existing ones based on genetic or pharmacological manipulation of redox rheostats to balance oxidative or reductive stress in angiogenic processes. The success of this project is built upon our major expertise in the field of angiogenesis in small vertebrate animal models as well as on the collaborations with leading laboratories that are active in research on the pre-clinical stages for angiogenesis-rel

1 999 827 €

Start date: 2016-07-01, End date: 2021-06-30