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The microtubule cytoskeleton provides an intracellular coordinate system and a mechanical scaffold for a multitude of essential cellular functions. The design principles underlying the dynamic organisation and function of the microtubule cytoskeleton are not understood. Using an in vitro reconstitution approach, we will determine the rules that govern which combination of mechano-chemical elements ...
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Targeting RAS oncogene addiction (RASTARGET)

Start date: May 1, 2013, End date: Apr 30, 2018,

Lung cancer is the most common type of malignant tumour worldwide and the leading cause of cancer-related death (335,000 deaths per year in Europe). The KRAS oncogene is frequently activated by point mutation in human lung cancer and mutations in the RAS family oncogenes are responsible for driving some 20% of all human malignancies. Most cell lines from RAS mutant tumours remain “oncogene addicte ...
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ATM is the protein kinase that is mutated in the hereditary autosomal recessive disease ataxia telangiectasia (A-T). A-T patients display immune deficiencies, cancer predisposition and radiosensitivity. The molecular role of ATM is to respond to DNA damage by phosphorylating its substrates, thereby promoting repair of damage or arresting the cell cycle. Following the induction of double-strand bre ...
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Aneuploidy, an abnormal number of chromosomes, is a hallmark of cancer cells, affecting the majority of all human tumours. Aneuploidy arises when errors occur during mitosis, as the duplicated chromosomes are distributed between the two new daughter cells. Paradoxically, aneuploidy appears to have detrimental consequences for the physiology of untransformed cells in vitro, inhibiting rather than s ...
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MAL: an actin-regulated SRF transcriptional coactivator (ACTINONSRF)

Start date: Oct 1, 2011, End date: Sep 30, 2017,

MAL: an actin-regulated SRF transcriptional coactivatorRecent years have seen a revitalised interest in the role of actin in nuclear processes, but the molecular mechanisms involved remain largely unexplored. We will elucidate the molecular basis for the actin-based control of the SRF transcriptional coactivator, MAL. SRF controls transcription through two families of coactivators, the actin-bindi ...
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Dendritic cells (DC) are a heterogeneous family of leucocytes with important functions in immunity. Little is known about the role of distinct DC subtypes in vivo. In the mouse, a subset known as CD8alpha+ DC has been argued to represent a discrete DC lineage with specialised properties. These include a superior capacity for presenting exogenous antigens to CD8+ and CD4+ T cells, which makes CD8al ...
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In antiviral RNAi, the DICER (DCR) enzyme processes virus-derived double-stranded (ds)RNA into siRNAs that guide ARGONAUTE proteins to silence complementary viral RNA. As a counter-defense, viruses deploy viral suppressors of RNAi (VSRs). Well-established in plants and invertebrates, the existence of antiviral RNAi in mammals has remained unknown until our recent findings (from my first postdoctor ...
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Anatomy and dynamics of the human replisome (AnDyHRep)

Start date: Sep 1, 2014, End date: Aug 31, 2016,

Accurately copying its whole genome is perhaps the most important task of the cell. Mistakes in DNA replication can result in cell death or, potentially worse, in mutagenesis and genomic instability, which in turn can lead to uncontrolled proliferation, the basis of cancer. Elucidating the factors involved in DNA replication and understanding the mechanisms by which human cells guarantee the prec ...
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Transcription and the maintenance of genome integrity (TRANSINTEG)

Start date: May 1, 2011, End date: Apr 30, 2016,

Maintaining genome integrity is crucial, especially in protein-encoding genes. DNA damage in genes can give rise to harmful mutations, but it can also directly obstruct the progress of transcribing RNA polymerase II (RNAPII), thereby blocking gene expression. Not surprisingly, repair pathways have evolved that specifically target lesions that stop RNAPII during its journey across a gene, so-called ...
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Regulating recombination in mitotic and meiotic cells (RECMITMEI)

Start date: May 1, 2011, End date: Apr 30, 2016,

DNA is a highly reactive molecule that is subject to deliberate, spontaneous and environmental damage. One of the most catastrophic lesions in DNA is the double-strand break (DSB), which if left unrepaired can result in cell death, infertility, genome instability and cancer. Homologous recombination (HR) is a largely error-free mechanism of DSB repair that utilizes an intact sister or homologous c ...
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Nuclear shape is one of the gold standards for detection and characterization of cancers. Nonetheless the control of nuclear morphology and its relationship to malignant behaviors are still poorly understood. We propose to study the mechanisms that lead to nuclear dysmorphia and their consequence on nuclear functions such as genome integrity and migration. The first part of the research will start ...
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Our genetic material is constantly exposed to mutagenic factors. DNA double-strand breaks (DSBs) represent one of the most dangerous forms of DNA damage and cells utilise two major pathways for their repair: error-prone non-homologous end-joining (NHEJ) and error-free homologous recombination (HR). The breast cancer susceptibility protein BRCA2 is a central player in HR that cooperates with its pa ...
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B cell activation required for antibody production and the establishment of immunological memory is initiated by antigen recognition through the B cell receptor (BCR) and subsequent internalization of antigen for presentation to T cells. After activation, B cells proliferate and differentiate into plasma cells or memory B cells. The mechanism involved in this B cell fate decision has been recently ...
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Highly active antiretroviral therapy is effective at controlling HIV-1 replication, however emergence and transmission of drug-resistant viruses is increasing, including viruses resistant to the newly developped integrase catalytic inhibitors. It is essential that new antiretrovirals (ARVs) become available. Most ARVs in development belong to the classes of viral enzyme inhibitors. Since HIV requi ...
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Oncogenic signalling by kinases presents a significant opportunity for cancer therapy. The B-Raf selective inhibitor, Vemurafenib, has shown great effect against B-Raf mutant melanoma patients. However, drug resistance emerges in nearly every case. Various mechanisms underlying this resistance are described, however these approaches usually overlook the heterogeneity of the tumour microenvironment ...
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DNA replication, the process where the genetic material is duplicated, is one of the most important and basic processes a cell undertakes. It is essential that this process is tightly and carefully regulated as errors in DNA replication are catastrophic, resulting in diseases like cancer. The synthetic or S phase of the eukaryotic cell cycle is entirely devoted to genome duplication by orchestrati ...
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Telomere function in meiosis (TELOMERES IN MEIOSIS)

Start date: Jun 1, 2010, End date: May 31, 2015,

Telomeres have long been known to play crucial roles in protecting chromosome ends from attrition and fusion and thus safeguarding genome stability, but their complete functional repertoire has yet to be fully understood. Among the fundamental roles of telomeres is their role in meiosis, the process by which parental genomes are recombined and halved, allowing the generation of genetic diversity v ...
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Our genetic material is continually subjected to damage, either from endogenous sources such as reactive oxygen species produced as by-products of oxidative metabolism, from the breakdown of replication forks during cell growth, or by agents in the environment such as ionising radiation or carcinogenic chemicals. To cope with DNA damage, cells employ elaborate and effective repair processes that s ...
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In each cell cycle, eukaryotic cells must faithfully replicate large genomes in a relatively short time. This is accomplished by initiating DNA replication from many replication origins distributed along chromosomes. Ensuring that each origin is efficiently activated once and only once per cell cycle is crucial for maintaining the integrity of the genome. Recent evidence indicates that defects in ...
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Dendritic cells (DCs) play an essential function in initiating adaptive immunity. Key to DC function are receptors for recognizing and capturing pathogens and damaged cells and for controlling subsequent antigen extraction, processing and presentation. DNGR-1 (also known as CLEC9A) is a DC-restricted C-type lectin receptor (CLR) that recognizes the actin cytoskeleton exposed on necrotic cells. DNG ...
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Our genetic material is continually subjected to damage and efficient repair is needed for cancer avoidance. DNA double-strand breaks are cytotoxic and are repaired either by Non Homologous End-Joining or Homologous Recombination (HR). HR provides an important function in DNA repair, where it serves the dual purpose of mending broken chromosomes and recovering sequence information that might be l ...
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The Hippo pathway is a highly conserved tumour suppressor pathway that restricts cell proliferation and promotes apoptosis. Although initially discovered in Drosophila, the Hippo pathway is highly conserved in mammals. Mutations and epigenetic silencing of Hippo pathway genes are frequently found in cancer tissues. Thus, our understanding of pathway regulation is important for the understanding of ...
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Autophagy is a conserved, highly regulated degradative pathway transferring cytoplasmic components in autophagosomes to lysosomes providing energy for cellular metabolism. In multicellular organisms autophagy is essential for tissue homeostasis and deficient autophagy is implicated in a broad range of diseases e.g. cancer and neurodegenerative disorders. To develop therapeutic strategies targeting ...
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A molecular view of chromosome condensation (CHROMOCOND)

Start date: Apr 1, 2010, End date: Mar 31, 2015,

Eukaryotic cells inherit much of their genomic information in the form of chromosomes during cell division. Centimetre-long DNA molecules are packed into micrometer-sized chromosomes to enable this process. How DNA is organised within mitotic chromosomes is still largely unknown. A key structural protein component of mitotic chromosomes, implicated in their compaction, is the condensin complex. In ...
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Meiosis is a fundamental process in cell biology. During meiosis several unique features events occur such as segregation of homologs rather than sister chromatids and repair of double strand breaks by recombination of the homologs happen. During the first reductional meiotic division, the telomeres cluster in a formation called "bouquet". The bouquet is important for the establishment and maturat ...
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Pancreatic cancer is one of the leading causes of cancer-associated mortality. One of the primary contributing factors is late diagnosis of the disease, resulting in established metastatic cancer before symptoms emerge. This form of cancer is characterised by a number of well-defined genetic alterations including oncogenic mutation of K-Ras and inactivating mutation of p53, SMAD4 and CDKN2A. Co ...
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"Chromosomal DNA is continuously subjected to exogenous and endogenous damaging insults. In the presence of DNA damage cells activate a multi-faceted checkpoint response that delays cell cycle progression and promotes DNA repair. Failures in this response lead to genomic instability, the main feature of cancer cells. Several cancer-prone human syndromes including the Ataxia teleangiectasia (A-T), ...
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Despite of intensive research the last decades, viral infection still represents a serious threat to human health. One crucial aspect of the defence against viral infection is the activation of the host innate immune response. Recent advances have highlighted the crucial role of the RIG-I receptor in triggering IFN synthesis upon virus infections. This virus sensing pathway mediated by RIG-I is cr ...
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Neurons are highly polarized cells that depend on anterograde and retrograde transport for survival, differentiation and maintenance of their morphology. Recently, impairment of axonal trafficking has been implicated as a causative agent in a number of human neurodegenerative disorders, such as Charcot-Marie-Tooth type 2B (CMT2B) neuropathy. CMT2B is characterized by the selective loss of motor an ...
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Mammalian haematopoiesis in the adult takes place predominantly in the bone marrow (BM) where a population of haematopoietic stem cells (HSC) are located. HSC are able to self-renew and give rise to all the blood cell types. The fate choice of HSC to either self-renew or differentiate is controlled by an interplay between intrinsic mechanisms and extrinsic signals from the surrounding environment ...
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In eukaryotic cells the microtubule (MT) cytoskeleton is of crucial importance for many essential cellular functions. The determination of cell morphology, intracellular transport, chromosome segregation in mitosis, and cell motility belong to the processes carried out by MTs. Aberrant cell morphology, developmental diseases and promotion of malignant transformations in animal cells are results of ...
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Activating point mutations in RAS are present in a large number of tumours. Besides treating tumours by reversing the effects of oncoproteins through inhibition, another approach is to use therapies that target tumour-specific vulnerabilities caused by the oncogenic state. To investigate this possibility, an siRNA screen has been performed in order to identify new genes necessary for the RAS-drive ...
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"A functional network of blood vessels is essential for all aspects of growth and organ function during embryonic development and adult life. A wide number of human disorders are related to vascular defects like cancer, diabetic retinopathy or stroke. During vascular remodelling, superfluous blood vessels regress in a process named vascular pruning. In contrast to the molecular mechanisms controll ...
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"It is increasingly clear that physico-chemical dysregulation of epithelial cells leads to the upregulation of stress-antigens that make the cells visible to sets of lymphocytes that include gamma delta T cells and NK cells. This form of stress-surveillance can make significant contributions to tumour immunology; transplant rejection; and inflammatory diseases. A central molecular axis underpinnin ...
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The genome is continuously exposed to DNA damaging insults that induce a wide variety of lesions. For a proper DNA damage signalling and repair, chromatin remodelling is most likely a prerequisite. Poly(ADP-ribose) (PAR) is known to induce chromatin relaxation at DNA damage sites but how this is achieved remains unclear. My host lab recently identified ALC1 (Amplified in Liver Cancer 1) that binds ...
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"During infection, recognition of the infectious microorganism by the innate immune system leads to dendritic cell (DC) activation. This process is essential for the induction of antigen-specific adaptive immune responses. DC can be activated directly by conserved pathogen molecules or indirectly by inflammatory mediators released by other cell types that recognized such molecules. However, recent ...
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Interruption of axons results in a characteristic reaction of the injured neuron, the so-called axonal response, which aims to induce axon elongation and to achieve a re-construction of effective synapses. Nerve fiber transection elicits a complex neuronal response that leaves neurons poised between death and regeneration. Although the signals underlying this dichotomy are not fully understood, so ...
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In eukaryotic cells, cohesion between sister chromatids allows chromosomes to biorient on the metaphase plate and holds them together until they separate into daughter cells at anaphase onset. Accurate control of the mechanisms implicated in sister chromatids cohesion after DNA replication and chromosome condensation during mitosis are essential for faithful chromosome segregation during cell divi ...
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The dendritic cell (DC) system of antigen-presenting cells controls immunity and tolerance. The unresolved issues on DC heterogeneity represent an important hurdle in the development of DC-based immunotherapies. The identification of the DNGR-1 marker by the host lab allows us to develop better models for characterising human and mouse DC. In the mouse, this marker is selectively expressed in mous ...
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Src-family kinases play major roles in promoting adherens junctions remodelling in development and metastasis. Their activities are negatively regulated by C-terminal Src kinase (Csk). The host lab it has recently shown that Drosophila Ankyrin-repeat, SH3-domain and Proline-rich-region containing (dASPP), together with Boa the homology of mammalian Ras association domain family 8, regulates the fu ...
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