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4-year PhD
Developmental and Stem Cell Biology

Project Supervisors

A large list of supervisors and projects throughout UCL, its related teaching hospitals and specialist centres and the National Institute for Medical Research is available to students.

A short abstract for each project, together with supervisor details, is given below. There are also links where available to supervisor web sites.

Prof Robin Ali Institute of Ophthalmology Stem cell therapy for retinal degeneration
Dr Buzz Baum MRC LMCB Robust patterning and morphogenesis in a living epithelium
Prof Andrew Copp Institute of Child Health Development and stem cell involvement in mammalian neural tube formation
Dr Nicolas Daudet Ear Institute Mechanisms of hair cell development and regeneration in the inner ear
Prof Patrizia Ferretti Institute of Child Health Cellular and molecular basis of neural regeneration
Prof Alex Gould Francis Crick Institute

Environmental regulation of neural stem cells

Prof François Guillemot Francis Crick Institute Transcriptional and signalling control of neural stem cell fates (NB this lab and project are not available for 2015-16)
Profs Kristjan R Jessen and Rhona Mirsky Dept Cell and Developmental Biology Schwann cell plasticity and nerve regeneration
Dr Nicoletta Kessaris Wolfson Institute for Biomedical Research  Interneuron development in the forebrain
Prof Martin Koltzenburg Institute of Neurology
Development of peripheral pain signalling neurons
Prof Alison Lloyd MRC LMCB Cell growth and regeneration (NB this lab and project are not available for 2015-16)
Prof Robin Lovell-Badge Francis Crick Institute Please see website
Prof Juan Pedro Martinez-Barbera Institute of Child Health Role of stem cells in pituitary tumorigenesis in mice and humans
Prof Roberto Mayor Dept Cell and Developmental Biology Migration and differentiation of the neural crest stem cells
Dr Paola Oliveri Genetics, Evolution and Environment Genetic program for the specification of neuroectoderm
Prof Franck Pichaud MRC LMCB Polarity & Morphogenesis

Dr Richard Poole

Dept Cell and Developmental Biology Project details TBA
Prof Stephen Price Dept Cell and Developmental Biology Motor nucleus formation in the spinal cord and hindbrain
Prof Antonella Riccio MRC LMCB Transcriptional and epigenetic mechanisms in developing neurons
Prof Bill Richardson Wolfson Institute for Biomedical Research Generation of new neurons in the adult mouse brain
Prof Christiana Ruhrberg Institute of Ophthalmology 1 Development of the precerebellar nuclei, 2 Vascular repair and regeneration
Prof Patricia Salinas Dept Cell and Developmental Biology Wnt signalling in neuronal circuit assembly and stem cell renewal
Prof Jane Sowden Institute of Child Health Developing new photoreceptors for retinal repair
Prof Philip Stanier Institute of Child Health The role of Tbx22 in palatine bone induction
Prof Claudio Stern Dept Cell and Developmental Biology Early embryo development and embryonic stem cells
Dr Masa Tada Dept Cell and Developmental Biology Mechanisms of cell extrusion from epithelia at initiation of carcinogenesis
Prof Jean-Paul Vincent Francis Crick Institute Uncovering the pathway that recognises misbehaving cells during development
Prof David Whitmore Dept Cell and Developmental Biology The impact of the biological clock and light on early embryonic development
Prof David Wilkinson Francis Crick Institute Regulation of boundary formation and neurogenesis
Prof Stephen Wilson Dept Cell and Developmental Biology Asymmetries in neurogenesis between left and right sides of the brain

Prof Robin Ali

Hereditary retinal disease and age related macular degeneration (AMD) are major causes of visual impairment with loss of photoreceptor cells leading to blindness. We have recently discovered that transplantation of rod precursor cells at a specific stage of development results in their integration and subsequent differentiation into rod photoreceptors that form synaptic connections and improve visual function in mouse models of retinal degeneration (MacLaren et al, Nature 2006). Stem cells, with properties of self-renewal and the potential to produce large numbers of neurons in vitro, offer an ideal donor source of cells to generate photoreceptor precursors for transplantation. Stem cells isolated from the adult ciliary margin (CM) of the eye, as well as embryonic stem cells are possible sources of large numbers of rod precursor cells. The aim of this project is to determine the local cues and transcription factors that might promote optimal integration and differentiation of transplanted stem cells. We have recently developed an integrase-deficient lentiviral vector (Yanez-Munoz et al, Nature Medicine 2006) that will be used for transient delivery of genes encoding key transcription factors or growth factors. These vectors will be used to transduce retinal stem cells within the retina or transduce stem cells before transplantation into the adult mouse in order to generate functional photoreceptors and repair degenerating retinae.

Dr Buzz Baum


During the course of this project, the student will use a combination of Drosophila genetics, RNAi and live cell imaging to study the development of a robust bristle pattern in the Drosophila notum. Genetic tricks and laser-induced cell ablation will then be used to determine how the epithelium is able to respond to perturbations in patterning and morphogenesis.
Finally the genes involved in normal developmental patterning and the response to wounding will be identified in an RNAi screen, using a library of flies carrying hair-pin RNAs.
This work will be done in collaboration with the theorist Guillaume Salbreaux at the Crick: http://www.crick.ac.uk/research/a-z-researchers/researchers-p-s/guillaume-salbreux/

Prof Andrew Copp

Neurulation, the process by which the embryo closes its neural tube, is a critical event in establishing the central nervous system. Failure of any aspect of neurulation leads to neural tube defects (NTDs), a group of severe congenital malformations that are either lethal or cause severe handicap in childhood. Our research uses mouse mutants which develop NTDs, in order to provide model systems for experimental analysis of normal and abnormal neurulation. We are also extending several aspects of the mouse-based research to humans, in order to improve our understanding of the clinical conditions and develop novel preventive therapies. Various projects on neurulation and NTDs are available in different aspects of this topic. For example, current interests include:
1. Live confocal-based imaging of neural tube closure in mouse embryos combining analysis of the normal process and comparison with mutants which fail in closure;
2. Defining and measuring the biomechanical properties of the closing neural tube and determining how neural tube closure fails, in physical terms, in mutants with neural tube defects;
3. Determining the role of planar cell polarity (PCP) signalling, and downstream cytoskeletal events, in various aspects of body axis development, using several PCP mutants available in the lab;
4. Understanding the process of neural fold fusion, which is mediated by cellular protrusions from the neural fold tips, and the subsequent tissue remodelling which involves localised apoptosis;
5. Cell lineage tracing using DiI labelling and Cre-loxP-YFP transgenics to determine the origin of the neural plate from the multipotential tail bud cell population;
6. Determining the cellular role of folic acid, and related molecules, in promoting neural tube closure in mouse strains where defects are preventable by folates, as in some human cases.

Dr Nicolas Daudet

chicken embryo

The sensory epithelia of the inner ear contain specialised ‘hair’ cells that are essential for hearing and our sense of balance. The disappearance of hair cells following acoustic trauma and during ageing is a very common cause of hearing loss because in mammals, lost hair cells are not replaced. By contrast, hair cells spontaneously regenerate throughout life in the inner ear of fish and birds. We are trying to understand the reasons for these differences by studying the cellular and molecular mechanisms controlling inner ear development and hair cell formation, using functional studies in chicken and mouse animal models.

Prof Patrizia Ferretti

The issue of neural injury in humans is of key importance given the incapacitating effects of spinal cord or brain injury and disease and their serious implications for both life quality in affected individuals and long term care requirements. We are interested in gaining further understanding of the mechanisms underlying the loss of regenerative capability that occurs during development with a focus on events triggered early after injury and the role of neural stem cells in the repair process. A better understanding of these processes may help to devise strategies for decreasing neural tissue damage by protecting neurones and glia from pro-apoptotic agents, and aid neural repair by stimulating a more effective endogenous stem cell response to injury. In recent proteomics and genomics studies comparing regenerating and non-regenerating chick spinal cords, we have identified a number of molecules/pathways which appear to be associated with changes in regenerative capability. We have evidence that some of these molecules (e.g. peptidylarginine deiminases) are important also in regulating death/survival of human neural stem cells in response to injury in vitro. Projects will be available to further elucidate the role of some of these pathways in normal development and in response to an insult using chick injury models (e.g. spinal cord injury, hypoxia) as well as human in vitro models mimicking the neural stem cell niche, and to assess the neuroprotective potential of novel inhibitors of peptidylarginine deiminases and of grafted somatic stem cells from different sources. Students will gain expertise in a broad range of cellular and molecular techniques.


Prof Alex Gould

It is well established that neural stem cells are influenced by local signals from niches, consisting of neighbouring glia, neurons and endothelial cells. There is also emerging evidence that the niche plays an important role in protecting neural stem cells from potentially damaging factors (stresses) in the environment. This project will harness the advanced tissue-specific genetics possible in Drosophila to identify the molecular mechanisms by which the niche protects neural stem cells from environmental stress. The starting point for the project are two studies from our lab (1,2) showing that Drosophila neural stem cells (neuroblasts) are much better protected than other cell types from environmental challenges such as malnutrition, hypoxia and oxidative stress. For each type of stress, emphasis will be placed on teasing apart the protective genes required in the glia of the stem cell niche versus those active in the neural stem cells themselves. The project will involve training in a wide range of techniques such as genetics, molecular biology, biochemistry, cell biology, confocal microscopy, mass spectrometry and bioinformatics.

Please see Gould Lab at The Crick and our external website for more details.


1. Bailey, AP; Koster, G; Guillermier, C; Hirst, EMA; MacRae, JI; Lechene, CP; Postle, AD and Gould, AP (2015). Antioxidant role for lipid droplets in a stem cell niche of Drosophila. Cell 163, 340-353.
2. Cheng, LY; Bailey, AP; Leevers, SJ; Ragan, TJ; Driscoll, PC and Gould, AP (2011). Anaplastic Lymphoma Kinase Spares Organ Growth during Nutrient Restriction in Drosophila. Cell 146, 435-447.
3. Sousa-Nunes, R; Yee, LL and Gould, AP (2011). Fat cells reactivate quiescent neuroblasts via TOR and glial insulin relays in Drosophila. Nature 471, 508-512.

Prof François Guillemot - please note this lab and project are not available for 2015-2016

Expression of the proneural gene Neurogenin2 with GFP (green) in a culture of neural stem cells (blue) promotes neuronal differentiation as marked by expression of ßIII-tubulin (red).

Most neurons of the brain are generated during embryonic life but new neurons are added during adult life in the hippocampus, where they have an important role in the acquisition of new memories. Hippocampal neurogenesis is stimulated by physical activity and it declines with age, which has been linked to the reduced cognitive performance associated with ageing in humans and mice. The neural stem cells that generate new neurons in the hippocampus divide more frequently in response to physical exercise while they become more quiescent as animals grow older. We have recently discovered that the proneural transcription factor Ascl1/Mash1 is essential for the division of neural stem cells in the hippocampus (unpublished data), and we have identified the target genes that Ascl1/Mash1 regulates in neural stem cells to promote divisions (Castro et al., 2011). Which signalling pathways induce the expression of Ascl1/Mash1 in hippocampal neural stem cells to promote neurogenesis is not known, although there are some candidates, including the Igf (insulin-like growth factor) and Shh (sonic hedgehog) pathways. The aim of this project is to identify the signalling mechanisms that control the division of adult neural stem cells through regulation of Ascl1/Mash1 expression, and to determine whether the stimulation of neurogenesis by physical activity and its decline in old animals are mediated by changes in Ascl1/Mash1 expression. Experiments will be conducted in whole animals as well as in neural stem cell cultures and will employ a broad range of molecular and genomic techniques.
Castro, D.S., Martynoga, B., Parras, C., Ramesh, V., Pacary, E., Johnston, C., Drechsel, D., Lebel-Potter, M., Galinanes-Garcia, L., Hunt, C., Dolle, D., Bithell, A., Ettwiller, L., Buckley, N., Guillemot, F. (2011). A novel function of the proneural factor Ascl1 in progenitor proliferation identified by genome-wide characterization of its targets. Genes Dev. 25, 930-945.

Profs Kristjan R Jessen and Rhona Mirsky

To learn about the developmental and regenerative events that allow myelinating Schwann cells of the peripheral nervous system to be generated from neural crest cells, we study molecular signalling in neural crest cells and between neurones and glia, examine how transcription factors control differentiation programmes and analyse intracellular signalling cascades that regulate survival, proliferation, myelination and regeneration.
Previously, we identified the Schwann cell precursor, an intermediate in the Schwann cell lineage. This cell is multipotent, and can generate several different cell types. Its ability to survive and generate Schwann cells depends on the neuronal signal neuregulin, and the rate at which immature Schwann cells are generated from it is controlled by the Notch signalling pathway.
We are currently interested in understanding whether Numb, an antagonistic molecule associated with the Notch signalling pathway, has a role in maintaining the distinctive multipotent molecular and morphological phenotype of the Schwann cell precursor. Experiments to test this proposition would involve cell culture both in the presence and absence of DRG neurons and use of dominant-negative or ShRNA constructs to knock down Numb levels. Conditional mouse models in which Numb is selectively deleted in Schwann cell precursors would also be used. Morphological and molecular analysis of the resultant phenotypes would be carried out.
Woodhoo A, Sahni V, Gilson J, Setzu A, Franklin RJM, Blakemore WF, Mirsky R and Jessen KR (2007) Schwann cell precursors: a favourable cell for myelin repair in the Central Nervous System. Brain 130:2175-2185.
Wanner IB, Guerra NK, Mahoney J, Kumar A, Wood PM, Mirsky R and Jessen KR (2006) Role of N-cadherin in Schwann cell precursors of growing nerves. Glia 54:439-459.
Parkinson DB, Bhaskaran A, Droggiti A, Dickinson S, D'Antonio M, Mirsky R and Jessen KR (2004) Krox-20 inhibits Jun-NH2-terminal kinase/c-Jun to control Schwann cell proliferation and death. J Cell Biol 164:385-394.
Dong Z, Brennan A, Liu N, Yarden Y, Lefkowitz G, Mirsky R and Jessen KR (1995) NDF is a neuron-glia signal and regulates survival, proliferation, and maturation of rat Schwann cell precursors. Neuron 15:585-596.
Jessen KR, Brennan A, Morgan L, Mirsky R, Kent A, Hashimoto Y and Gavrilovic J (1994) The Schwann cell precursor and its fate: A study of cell death and differentiation during gliogenesis in rat embryonic nerves. Neuron 12:509-527.

Dr Nicoletta Kessaris

Interneurons in the adult cortex function as regulators of cortical activity. They represent a heterogeneous population of cells in terms of morphology, neurochemical and physiological properties. Our work aims to understand how this diversity arises from neuroepithelial stem cells during embryonic development. We recently used genetic manipulations in model organisms to tag specific neuroepithelial populations with fluorescent proteins and examine their cortical interneuron progeny during development and in the adult forebrain. Using microarray analysis of purified immature interneuron populations we identified a number of genes that may be involved in the development and maturation of these cells. The involvement of cortical interneurons in human diseases such as autism, schizophrenia and epilepsy, all of which are considered neurodevelopmental disorders, opens up the possibility of a role for these candidate genes in these disorders. The project will involve gene expression analysis followed by functional studies in mice using gain- and loss-of-function approaches.
Rubin AN, Alfonsi F, Humphreys MP, Choi CK, Rocha SF, Kessaris N. (2010) The germinal zones of the basal ganglia but not the septum generate GABAergic interneurons for the cortex. J Neurosci. 30(36):12050-62.
Nóbrega-Pereira S, Kessaris N, Du T, Kimura S, Anderson SA, Marín O. (2008) Postmitotic Nkx2-1 controls the migration of telencephalic interneurons by direct repression of guidance receptors. Neuron 59(5):733-45.
Fogarty M, Grist M, Gelman D, Marín O, Pachnis V, Kessaris N. (2007) Spatial genetic patterning of the embryonic neuroepithelium generates GABAergic interneuron diversity in the adult cortex. J Neurosci. 27(40):10935-46.
Keywords: CNS development, Cre-lox technology, interneurons

Prof Martin Koltzenburg

Dorsal root ganglion stained for peripherin (red, a marker for many nociceptors) and neurofilament (blue, a marker for most mechanoreceptors)

Chronic pain which is often resistant to current treatments affects approximately 15% of the general population including children. Pain is also an important neurobiological model system and it is therefore of considerable interest to study the mechanisms that determine the developmental emergence of nociceptors. These sensory neurons of the peripheral pain pathway express unique sets of ion channels that endow them with their remarkable ability to detect tissue damaging stimuli. Recent research has shown that lack of function mutations of sodium channels or of growth factor receptors such as the NGF receptor trkA leads to congenital insensitivity to pain. Knowledge about these processes is crucial for the discovery of novel medicines that combat pain. We investigate the functional development of ion channels in sensory neurons with ratiometric calcium imaging in novel compartmentalised cultures. We have shown that different nociceptor subtypes develop in distinct waves starting in the mouse as early as E11.5 (corresponding to 6 weeks of human gestation) and extending well into the postnatal period. We are currently investigating the role of neurotrophic factors and pivotal transcription factors such as Runx1 for the developmental emergence of transient receptor (TRP) ion channels such as the capsaicin receptor TRPV1 that transduce painful stimuli and the emergence of different types of sodium channels that are crucial for action potential propagation in nociceptors rather than non-nociceptive neurons. Interestingly, while NGF is a prototypical survival factor it is not capable to induce the expression of TRPV1 channels. Knowledge from these studies will provide a better understanding of hereditary neuropathies and chronic pain, areas of large unmet medical need for novel therapeutics.
Hjerling-Leffler J, AlQatari M, Ernfors P, Koltzenburg M. Emergence of functional sensory subtypes as defined by transient receptor potential channel expression. J Neurosci 2007:2435-43.
Mantyh PW, Koltzenburg M, Mendell LM, Tive L, Shelton DL (2011) Antagonism of nerve growth factor-TrkA signaling and the relief of pain. Anesthesiology 115:189-204.
Park U, Vastani N, Guan Y, Raja SN, Koltzenburg M, Caterina MJ (2011) TRP vanilloid 2 knock-out mice are susceptible to perinatal lethality but display normal thermal and mechanical nociception. J Neurosci 31:11425-11436.
Schmalhofer WA, Calhoun J, Burrows R, Bailey T, Kohler MG, Weinglass AB, Kaczorowski GJ, Garcia ML, Koltzenburg M, Priest BT (2008) ProTx-II, a selective inhibitor of NaV1.7 sodium channels, blocks action potential propagation in nociceptors. Mol Pharmacol 74:1476-1484.

Prof Alison Lloyd - please note this lab and project are not available for 2015-2016

schwann cells

The peripheral nervous system is one of the few tissues in the mammalian adult, which is capable of extensive regeneration. This process is all the more remarkable, in that repair can reconnect and re-establish fully transected nerves – requiring both the production of new tissue to bridge the gap between the nerve stumps and the accurate direction of regrowing axons back to their targets. Schwann cells are known to play a pivotal role in this process. In the adult, these highly specialised cells are normally in a quiescent state, myelinating larger axons or bundling together groups of smaller axons. Upon injury however, they dedifferentiate en masse to a progenitor/stem-like state and the proliferation and organisation of these cells is known to be critical for the repair process - for example by stimulating axonal growth. Schwann cell number and state is strictly controlled by the axon both during development and following repair. Imbalances in this tightly regulated system would be predicted to result in either degenerative disorders or hyperproliferative disorders such as cancer. Consistent with this view, Schwann cell tumours, especially neurofibromas, resemble an unrepaired wounded nerve, in that Schwann cells within the tumours are dedifferentiated and proliferate in the absence of axonal contact in a mixture of fibroblasts and inflammatory cells. How and why these differentiated cells retain this plasticity is unknown but a question of fundamental importance for regenerative medicine and for our understanding of Schwann cell tumourigenesis. In recent work, using a combination of powerful in vitro and in vivo model systems, we have explored the signalling pathways responsible for Schwann cell plasticity and how these are deregulated in cancer.

Projects in the lab include the following

  • Understanding the plasticity of the Schwann cell differentiation state
  • Schwann cell/axonal interactions during repair and cancer
  • Novel mouse models for studying tumour development in NF1
  • Role of the microenvironment in the repair process and cancer

Selected references:
Simona Parrinello, Ilaria Napoli, Sara Ribeiro, Patrick Wingfield Digby, Marina Fedorova, David B. Parkinson, Robin D. S. Doddrell, Masanori Nakayama, Ralf H. Adams and Alison C. Lloyd. EphB signalling directs peripheral nerve regeneration through Sox2-dependent Schwann cell sorting. Cell 2010 143 145-155.
Simona Parrinello and Alison C Lloyd. Neurofibroma development in NF1 – insights into tumour initiation. TRENDS in Cell Biology 2009 19 395-403.
Simona Parrinello, Luke A Noon, Marie C Harrisingh, Patrick Wingfield Digby, Pedro Echave, Catherine A Cremona, Laura Rosenberg, Adrienne M Flanagan, Luis Parada and Alison C Lloyd. NF1 loss impairs Schwann cell-axonal interactions: a novel role for semaphorin 4F. Genes and Development (2008) 22, 3335-3348.
Harrisingh MC, Perez-Nadales E, Parkinson DB, Malcolm DS, Mudge AW and Lloyd AC. The Ras/Raf/ERK signalling pathway drives Schwann cell dedifferentiation. EMBO J (2004) 23, 3061-3071.
Mathon NF, Malcolm DS, Harrisingh MC, Cheng L, Lloyd AC. Lack of replicative senescence in normal rodent glia. Science (2001) 291, 872-875.

Prof Juan Pedro Martinez-Barbera

My laboratory is focused on investigating the role of Hesx1 in forebrain and pituitary development. This research is important because mutations in Hesx1 are associated with pituitary, eye and forebrain defects in mice and humans. My research program aims to dissect the molecular pathways that are controlled by Hesx1 during normal development. This will lead to a better understanding of the pathogenesis of human conditions where Hesx1 is mutated. Besides, it is a logical avenue to identify novel candidate genes, which might be mutated in humans suffering from pituitary, eye and forebrain defects.
Currently, there are two main lines of research: (i) The role of Wnt/beta-catenin signaling in anterior forebrain and pituitary development. We are exploring the relationship between this important signaling pathway and Hesx1. This study involves the use of conditional mouse models for components of this pathway, compound mutants, zebrafish experiments, microarray studies, in vitro assays, etc. Interestingly, this research has led us to study a particular type of cancer affecting the pituitary gland. (ii) The role of DNA methylation in mediating the HESX1-repressor activity. It seems likely that HESX1 mediates its molecular function by CpG methylation of target genes. This research aims to the identification of HESX1 targets and the study of CpG methylaton patterns in Hesx1+/+ and Hesx1-/- cells and embryos.
Experimentally, we combine mouse genetics (ES cell targeting, knock-in and knock-out mice), molecular biology and developmental biology techniques.
I will be very happy to accommodate one student in one of these ongoing projects.
1. Gaston-Massuet, C., Andoniadou, C.L., Signore, M., Sajedi, E., Bird, S., Turner, J.M.A. and Martinez-Barbera, J.P. (2008). Genetic interaction between the homeobox transcription factors HESX1 and SIX3 is required for normal pituitary development. Dev. Biol. DOI:10.1016/j.ydbio.2008.08.008.
2. Sajedi, E., Gaston-Massuet, C., Signore, M., Andoniadou, C.L., Kelberman, D., Castro, S., Etchevers, H.C., Gerelli, D., Dattani, M.T. and Martinez-Barbera, J.P. (2008). Accepted in Disease Models and Mechanisms.
3. Sajedi, E., Gaston-Massuet, C., Andoniadou, C.L., Signore, M., Hurd, P., Dattani, M. and Martinez-Barbera, J.P. (2008). DNMT1 interacts with the developmental transcriptional repressor Hesx1. Biochemica et Biophysica Acta (Molecular Cell Research) 1783, 131-143.
4. Andoniadou, C.L., Signore, M., Sajedi, E., Gaston-Massuet, C., Kelberman, K., Burns, A.J., Itasaki, N., Dattani, M. and Martinez-Barbera, J.P. (2007). Lack of the murine homeobox gene Hesx1 leads to a posterior transformation of the anterior forebrain. Development 134, 1499-1508.
5. Ivanova, A., Signore, M., Caro, N., Greene, N.D., Copp, A.J., Martinez-Barbera, J.P. (2005). In vivo genetic ablation by Cre-mediated expression of diphtheria toxin fragment A. Genesis 43, 129-135.
6. Dasen, J.S., Martinez-Barbera, J.P., Hernan, T.S., O’Connel, S., Olson, L., Ju, B., Tollkuhn, J., Buek, S.H., Rose, D.W. and Rosenfeld, M.G. (2001). Temporal switching of a paired-like homeodomain repressor/TLE corepressor complex for a related activator mediates pituitary organogenesis. Genes and Development 15, 3193-3207. Impact factor: 15.050.
7. Martinez-Barbera, J.P., Clements, M., Thomas, P., Rodriguez, T., Meloy, D., Kioussis, D., Beddington, R.S. (2000). The homeobox gene Hex is required in definitive endodermal tissues for normal forebrain, liver and thyroid formation. Development 127, 2433-2445.
8. Martinez-Barbera, J.P., Rodriguez, T.A., Beddington, R.S. (2000). The homeobox gene Hesx1 is required in the anterior neural ectoderm for normal forebrain formation. Dev. Biol. 223, 422-430.
9. Dattani, M.H., Martinez-Barbera, J.P., Thomas, P.Q., Brickman, J.M., Gupta, R., Martensson, I.-L., Toresson, H., Fox, M., Wales, J.K.H., Hindmarsh, P.C., Krauss, S., Beddington, R.S.P., Robinson, I.C.A.F. (1998). Mutations in the homeobox gene Hesx1/HESX1 associated with septo-optic dysplasia in human and mouse. Nature Genetics 19, 125-133.

Prof Roberto Mayor


The Neural Crest (NC) gives rise to the Peripheral Nervous System, cartilage, bone and muscle in the face and neck, pigmented cells in the skin, several endocrine glands and part of the heart. Two are the most astonishing characteristic of NC cells: its ability to migrate very long distances in the embryo and its extraordinary ability to become many different types of cell.
PhD projects:
1. Migration of the NC Cells: Our aim is to identify the signals that control the initial delamination of the NC from the ectoderm, how the direction of migration is controlled and what stops NC migration once they reach its final target.
2. Differentiation of the NC Stem Cells. As the NC cells are able to originate a huge variety of different cell types it has been proposed that they have Stem Cell properties; however the molecular bases for these properties are unknown. Our aim is to identify the genetic cascade that controls the stem cell properties of the NC. Several screenings to identify new genes and candidate genes will be tested.
Both Projects will use Xenopus and zebrafish embryos and molecular and cell biology techniques (e.g. cloning, in situ hybridization, time lapse confocal video microscopy).

Dr Paola Oliveri

A fundamental question is to understand how the program for the development of an organism is encoded in the genomic DNA. During embryo development cells progressively restrict their fate and get specified to become one or more cell types. Regulatory genes (transcription factors and signal transduction molecules) are responsible for cell fate decision and are functionally linked
in large networks, which execute the developmental program. Our goal is to study the gene regulatory network (GRN) underlying neuroectoderm specification in the sea urchin embryo to bridge genomic information and developmental events. Sea urchin has been proven to be an excellent experimental system for regulatory network studies. So far, the most comprehensive models for early
embryo development is the GRN for sea urchin endomesoderm. The GRN model will emerge from a system-level approach in which the regulatory genes involved during neuroectoderm development will be linked by cause-effect relationships. To this purpose the most advanced molecular biology, quantitative analysis and
classical embryology methodologies are used. A comparative analysis of sea urchin and vertebrate networks for neuroectoderm specification will identify commonalities that are essential for this cell type and principle of GRN modification.

Prof Franck Pichaud

During development, epithelial cells must evolve an apico-basal axis of polarity as well as discrete cell-cell contacts to enable organogenesis. Similarly, neurons are also highly polarized cells that differentiate their dendrites from the axon in order to enable neural circuit formation. Defective epithelial polarity is a hallmark of cancer and is thought to be a precursor of cell metastasis. Polarity defects during neuron migration and differentiation are thought to be contributing factors toward a number of neurodevelopmental conditions. There is therefore a strong impetus to elucidate the cellular and molecular basis for epithelial and neuronal differentiation, polarity and morphogenesis during development, as well as how these cells are maintained through adulthood.


1) Apico-basal polarity remodeling during development
A significant part of my group uses the developing pupal photoreceptor (PR) to elucidate the cellular and molecular basis for epithelial cell apical membrane differentiation, maturation and maintenance. This includes the elaboration of the apical most microvilli and sub-apical domain and the formation of the main apical cell-cell junction called the zonulaadherens (za). This part of our work is also designed to probe the interface between polarity proteins and global cell signaling (Pinal et al., Curr Biol., 2006; Richardson, Dev., 2010; Walther & Pichaud, Curr Biol., 2010; Pinal et al., JCS, 2011; Fichelson et al., PNAS, 2012).

2) Adherens Junction remodeling during organogenesis
A small team in my group uses the developing eye imaginal disc to elucidate the cellular and molecular basis for Adherens Junction (AJ) remodeling during organogenesis. Here we aim to integrate apical junction remodeling and associated cell shape changes together with cell division, apoptosis and differentiation. The wealth of prior knowledge that exists in the case of early compound eye morphogenesis makes this developmental context ideal for such an integrative study. More specifically, we would like to understand how apical cell constriction and regulated epithelial cell intercalation are orchestrated during retinal development to produce the crystal-like array of ommatidia that characterizes the compound eye. We have previously shown that in the developing retina, apical cell constriction is regulated by the Hedgehog (Hh) pathway (Corrigall et al., Dev Cell, 2007). In addition, we have recently established that the EGFR-signaling pathway governs AJ remodeling and associated cell intercalation during ommatidial patterning (Robertson et al., Dev., in press). We have shown that both of these instances of controlled apical junction remodeling are transcriptionally regulated downstream of Cubitusinteruptus for cell constriction and pointed for intercalatory behaviour respectively.

3) Neuronal differentiation and morphogenesis
An increasingly large part of my group is working on the problem of neuronal morphogenesis and polarity. Our approach is two fold: on the one hand, we have started to study the poorly understood role of transcriptional regulation during neuronal maturation and morphogenesis. On the other hand, we have begun to set up new approaches to uncover novel cellular and molecular mechanisms governing polarized axonal growth in vivo.

Prof Stephen Price

We are a group of Developmental Neurobiologists interested in how specificity is imparted during development to the formation of functionally related neurons into neuronal nuclei. Since joining UCL at the end of 2003, we have focussed our efforts on a role for the cadherin family of cell adhesion molecules in neuronal nucleus formation. Currently, we are studying motor nucleus formation in the spinal cord and hindbrain, formation of auditory hindbrain nuclei and the formation of basal ganglia structures. We approach these problems from the hydrogen bond level through to the whole embryo. This broad approach is achieved in part through our extremely productive collaborations with a group of structural biologists at Columbia University in New York and with a group of physicists in the Centre for Nanotechnology at UCL. Candidates may be interested in the references below and should contact the group by emailing stephen.price@ucl.ac.uk
Patel, S. D., Ciatto, C., Chen, C. P., Bahna, F., Rajebhosale, M., Arkus, N., Schieren, I., Jessell, T. M. Honig, B., Price, S. R., and Shapiro, L. (2006) Crystal structures of type II cadherin ectodomains: Implications for the functional specificity of classical cadherins. Cell, 124, 1255-1268.
Price, S. R., DeMarco-Garcia N. V., Ranscht, B. and Jessell, T. M. (2002) Regulation of Motor Neuron Pool Sorting By Differential Expression of Type II Cadherins. Cell, 109, 205-216.

Prof Antonella Riccio

Within the nervous system, neurotrophic factors and activity regulate a wide range of processes including the proliferation of neuronal precursors, and the growth, survival, and synaptic connectivity of developing neurons. Many, if not all of the stimuli that contribute to such processes have the capacity to signal to the nucleus and influence gene expression. Our laboratory is interested in understanding the transcriptional and epigenetic mechanisms that regulate gene expression in neurons. We will use in vivo and in vitro models to address 1) the role of the transcription factor CREB in the adult and developing nervous system 2) characterize a novel signalling pathway that controls neuronal gene expression by inducing epigenetic changes 3) identify RNA transcripts locally translated in axons.

Prof Bill Richardson

It used to be thought that, once the brain was fully developed, no further neurogenesis occurred during adult life. This is now known to be wrong; neural stem cells persist in the subventricular zones (SVZ) of the adult forebrain and the dentate gyrus of the hippocampal formation and these continuously generate new neurons that integrate into the olfactory bulb and hippocampus, respectively, where they are required for laying down new olfactory and spatial memories. There is another population of cells with stem cell-like properties – so called “adult oligodendrocyte precursors (adult OLPs)”, which are distributed widely and uniformly through the adult brain and spinal cord. These continuously generate new oligodendrocytes (the myelinating cells) throughout the adult brain. These cells can regenerate myelin (the insulating sheath around axons) after the demyelinating damage that occurs during diseases like multiple sclerosis. They also generate new oligodendrocytes to myelinate circuits that are newly activated during motor learning (e.g. in mice that learn to run on “complex wheels” with unevenly-spaced rungs). It is not known whether new oligodendrocytes and myelin are required for other types of learning, particularly spatial learning, which is hippocampus-dependent. The student will study oligodendrocyte development in the postnatal hippocampus and, using genetic, histochemical and behavioural approaches, will investigate the role of adult-born oligodendrocytes in spatial learning and memory.

Prof Christiana Ruhrberg

Project 1: Development of the precerebellar nuclei
Prof Christiana Ruhrberg and Dr Camille Charoy
Project outline: During mammalian hindbrain development, precerebellar neurons emigrate from their birth-place in the dorsal rhombic lip to assemble the paired inferior olive (IO) and pontine nucleus (PN) nuclei adjacent the ventral floor plate. These nuclei are part of the subcortical motor system that controls behaviour and internal organ function. We found that the migrating precerebellar neurons express the vascular endothelial growth factor (VEGF) and its receptor neuropilin 1 (NRP1). Moreover, we found that both the ligand and receptor are required for the normal assembly of both sets of nuclei. Building on these data, the student will use developmental biology techniques such as microdissection, immunofluorescence, in situ hybridisation and DiI labelling to investigate how VEGF signalling through NRP1 controls the development of the precerebellar nuclei, including the cellular mechanisms and signal transduction pathway. For a PhD project, additional experiments will additionally include studying the consequence of defective precerebellar nuclei development on adult mouse behaviour.
5 key references:
Cariboni, A., Andre, V., Chauvet, S., Cassatella, D., Davidson, K., Caramello, A., Fantin, A., Mann, F., Bouloux, P., Pitteleoud, N., Ruhrberg, C. (2015). Semaphorin 3E signalling is required for GnRH neuron development and disrupted in Kallmann Syndrome. Journal of Clinical Investigation 125 (6): 2413-28.
- Editorial: Fertility and fragrance: another cause of Kallmann syndrome; doi.org/10.1172/
Wiszniak, S., Mackenzie, F., Anderson, P., Kabbara, S., Ruhrberg, C.*, and Schwarz, Q.* (2015). Neural crest cell-derived VEGF promotes embryonic jaw extension. PNAS 12 (19): 6086-91. *co-corresponding
Tillo, M., Erskine, L., Cariboni, A., Fantin, A., Joyce, A., Denti, L. and Ruhrberg, C. VEGF189 binds NRP1 and is sufficient for VEGF/NRP1-dependent neuronal patterning in the developing brain. Development 15;142(2):314-9.
Cariboni, A., Davidson, K., Dozio, E., Stossi, F., Parnavelas, J. G., Ruhrberg, C. (2011). VEGF isoform signalling controls GnRH neuron survival via NRP1, independently of VEGFR2/KDR and blood vessels. Development 138(17):3723-3733.
Erskine, L., Reijntjes, S., Pratt. T., Denti, L., Schwarz. Q., Vieira, J. M. V., Alakakone, B., Shewan, D., Ruhrberg, C. (2011). VEGF signalling through neuropilin 1 guides commissural axon crossing at the optic chiasm. Neuron 70(5):951-965.
- Editorial: VEGF shows its attractive side at the midline. Neuron 70(5):808-812.
- Faculty of 1000: must read; http://f1000.com/11300957

Project 2: Vascular repair and regeneration
Prof Christiana Ruhrberg and Dr Alessandro Fantin
Project outline: Understanding the mechanisms of tissue vascularisation will enable the design of therapies for ischemic diseases. For example, the vascularisation of tracheal scaffolds is currently a rate-limiting step in regenerative medicine programmes to help patients lacking a trachea due to injury or disease. Moreover, the trachea provides an ideal model to study physiological angiogenesis in a postnatal setting. Thus, the trachea assembles a vascular network to support tissue growth during embryogenesis, but this network collapses after birth concomitantly with cartilage remodelling and then regrows to support the adult organ. Our pilot data have already identified molecular pathways that control trachea vascularisation. For this project, the student will perform immunolabelling and quantitative image analysis of tracheal tissue with mutations in signalling pathways implicated in angiogenesis of other tissues. A particular focus will be on distinguishing growth factor from extracellular matrix-driven angiogenesis pathways. Further techniques to be learnt include in situ hybridisation and expression analysis by quantitative real time PCR. This project is suitable to be developed into a PhD project and in that case would be extended to a collaboration with Professor Martin Birchall at the Royal Ear Nose and Throat Hospital for clinical translation.
5 key references:
Plein, A., Calmont, A., Fantin, A., Denti, L., Anderson, N., Scambler, P. and Ruhrberg, C. (2015). Neural crest-derived SEMA3C activates NRP1 to enable the endothelial-to-mesenchymal transition that is essential for cardiac outflow tract septation. Journal of Clinical Investigation 125 (7): 2661-2676.
- Cover image
Fantin, A., Lampropoulou, A., Gestri, G., Raimondi, C., Ruhrberg, C. (2015) Neuropilin 1 (NRP1) promotes sprouting angiogenesis by enhancing filopodia extension via CDC42. Cell Reports 11(10):1577-90.
Raimondi, R., Fantin A., Lampropoulou, A., Denti, L., Chikh, A. and Ruhrberg, C. (2014) Imatinib inhibits VEGF-independent angiogenesis by targeting NRP1-dependent ABL1 activation in endothelial cells. Journal of Experimental Medicine 211(6): 1167-1183.
Lanahan, A., Zhang, X., Fantin, A., Zhuang, Z. W., Rivera-Molina, F., Speichinger, K. R., Prahst, C., Zhang, J., Wang, Y., Davis, G. E., Toomre, D., Ruhrberg, C.* and Simons M.* (2013). The NRP1 cytoplasmic domain is required for VEGF-A-dependent arteriogenesis. Developmental Cell 25(2): 156-68. *co-corresponding
Fantin, A., Vieira, J. M., Plein, A. R., Denti, L., Fruttiger, M., Pollard, J. W. and Ruhrberg, C. (2013). NRP1 acts cell autonomously in endothelium to promote tip cell function during sprouting angiogenesis. Blood 121(12): 2352-62. 

Tracheal vasculature
Tracheal vasculature

Prof Patricia Salinas

EGFP-expressing hippocampal neuron labelled with vGlut1 and PSD95 to determine the number of innervated spines

The elucidation of the molecular mechanisms that regulate the formation and maintenance of synapses is central for understanding how complex neuronal circuits are formed during development and how they are modulated during the life of the organism. Importantly, understanding these molecular principles is crucial for developing therapeutic approaches for nerve and brain repair after injury or disease.
Great progress has been made in the identification of the signals that regulate synapse formation. Several labs, including ours, have identified signalling molecules that regulate the assembly and maturation of synapses in the mammalian brain. However, the specific molecular mechanisms and signalling pathways that lead to the recruitment of synaptic components to future synaptic sites are poorly understood.  Our aim is to elucidate these mechanisms by focusing our attention on the Wnt family of secreted proteins. We previously found that Wnts promote neuronal circuit formation by promoting the recruitment of synaptic proteins to future synaptic sites. However, the precise mechanisms by which Wnt modulates synapse assembly remain poorly understood.
More recently, we found that Wnts promote synaptic maintenance and synaptic transmission. In vivo blockade of Wnt signalling induces the disassembly of mature synapses and synaptic dysfunction. We are currently investigating how Wnt promotes synapse maintenance. To elucidate how Wnts promote synapse formation and maintenance we are taking an interdisciplinary approach that combines biochemistry, state-of-the-art cell imaging techniques, molecular genetics, electrophysiology and behavioral studies.
Our studies will provide crucial information for the identification of novel therapeutic approaches for nerve regeneration after injury and for synapse protection at early stages of neurodegenerative diseases such as Parkinson’s and Alzheimer’s disease.

Prof Jane Sowden

This project aims to promote stem cell cultures to differentiate to produce new photoreceptors for repair of the retina. Retinal diseases leading to the loss of rod and cone photoreceptor cells are major causes of irreversible blindness. As the retina is unable to regenerate itself, replacement of lost photoreceptors by transplanting new cells into the retina is one possible therapeutic approach. We recently discovered that immature cells taken from the peak stage of rod photoreceptor development, when the retina is forming, can be successfully transplanted and restore some vision in models of retinal disease (see Nature, 2006. 444[7116]: p. 203-7). Our experiments show that the mature retina, previously believed to have no capacity for repair, is in fact able to support the development of new rod photoreceptors. As many retinal diseases, including those causing childhood blindness, affect the cone-rich macular region of the retina that provides high visual acuity and colour vision, this project will investigate whether we can develop new cone photoreceptors from in vitro stem cell cultures for retinal repair. Fluorescent transgene reporters will be used to identify retinal progenitor cells, and based on knowledge of retinal development, the genes promoting photoreceptor differentiation will be induced by manipulation of signalling pathways. This exciting project will provide the successful candidate with a broad training and expertise in retinal development and experimental models of retinal disease, transgenesis, stem cell biology, molecular biology, cell culture and histology techniques.

Prof Philip Stanier

Orofacial defects, particularly clefts of the lip or palate are among the most common human birth defects found worldwide. The molecular pathways that lead to these craniofacial anomalies are largely unknown. Mutations in the gene encoding the T-box transcription factor TBX22 on the X-chromosome were first identified in this laboratory and still represent one of very few known genetic causes of non-syndromic cleft palate. Cleft palate can arise as a consequence of reduced shelf outgrowth from the maxillary prominence, a failure to elevate and correctly align above the tongue, failure during shelf contact and/or epithelial seam degeneration or failure in appropriate bone formation in the hard palate. It is rarely possible to identify which of these is affected by the time the defect is detected at birth. We are therefore investigating the anatomical and molecular defect underlying X-linked cleft palate in a mouse model that is deficient for Tbx22. In the majority of animals, the palatal shelves appear to grow and fuse normally but lack appropriate development of the posterior bones of the hard palate, giving rise to a submucous cleft palate. This project aims to investigate the failed Tbx22-dependent mechanisms that are normally required for palatine bone induction.
Braybrook et al. X-linked cleft palate and ankyloglossia (CPX) is caused by mutations in the T-box transcription factor gene TBX22. Nat Genet 2001 29: 179-183.
Stanier P and Moore GE. Genetic basis for cleft lip and palate: syndromic genes contribute to the incidence of nonsyndromic clefts. Hum Mol Genet 2004 13: R73-R81.
Andreou et al. TBX22 missense mutations found in patients with X-linked cleft palate affect DNA binding, sumoylation and transcriptional repression. Am J Hum Genet 2007 81: 700-712.

Prof Claudio Stern

The research in our laboratory focuses on the processes that establish cell diversity and pattern in the early embryo. We ask the questions: how do cells in the embryo know what fates to adopt, at the right positions and at the right time? What mechanisms ensure that the correct proportions of cells are allocated to different organs? Currently, the projects in the lab fall into four major headings: 1. How do higher vertebrate embryos establish their polarity, and what mechanisms coordinate cell movements with gene expression? 2. What mechanisms are responsible for inducing the early nervous system? 3. How is the early nervous system subdivided into forebrain, midbrain, hindbrain and spinal cord? 4. Embryonic stem cells - where are they in the embryo, and can we harness them to understand developmental pathways?

Dr Masa Tada

Of transformed cells (red), one cell (magenta arrowhead) is escaping from the zebrafish embryonic epithelium

My lab is interested in understanding the mechanisms underlying morphogenetic processes: the coordination of cells in a homogenous cell population and the interplay between two different cell populations. We have established the enveloping layer (EVL) of the early zebrafish embryo, using a tamoxifen-inducible Gal4-UAS system, as an in vivo model for a simple epithelium at initiation of carcinogenesis (Kajita et al., Nat Commun, 2014). When forced to express the transforming oncogene Src in the EVL in a mosaic manner, most cells will be apically “extruded” from that epithelium, whereas expression of another transforming oncogene, Ras, fails to trigger cell extrusion. Currently, we are investigating the following questions: what are the “extrude me” signals emitted by transformed cells?; how do wild-type epithelia detect transformed cells?; and what determines the direction of extrusion, apical or basal? To address these questions, we will use a variety of transgenic lines (e.g. myosin-GFP and actin-RFP) to analyse cell behaviours based on confocal time-lapse movies in combination with sophisticated genetic approaches.

Prof Jean-Paul Vincent


Embryonic development is an amazingly reliable process. Most embryos give rise to fully patterned organisms with great accuracy. One process that contributes to such accuracy is the elimination of mis-specified or defective cells during development. Such elimination is evident in patterning mutants, where cell death is often observed. For example, as shown in the figure, extensive apoptosis is seen in fushitarazu (ftz) mutants of Drosophila. Importantly, ftz is not required for cell survival per se. Indeed, it can be knocked down from cultured cells without deleterious effect. However it is likely that the absence of Ftz during development will cause many cells to express a non-sense combination of developmental regulators. We predict that there is machinery that detects such non-sense and triggers apoptosis as a result. We propose to take advantage of the power of Drosophila genetics to identify components of this hypothetical machinery. We already know that hid, a key proapoptotic gene, is transcriptionaly upregulated in ftz (and other developmental) mutants. Moreover, Hid is required for apoptosis to take place in ftz mutants. Therefore, we can reduce our aim to the identification of genes that are required for hid upregulation in developmental mutants. To this end, we will first devise a reporter of hid transcription (using genomic engineering and/or BAC recombineering). We will then use a deficiency collection (comprising about 1000 lines that collectively uncover about 90% of the genome) to screen for genes that are required for upregulation of the hid reporter in ftz mutants. Once such genes are identified, we will ask if they encode general components of apoptosis or whether they are specifically required for the elimination of mis-specified cells. We hope to decipher how the latter contribute to the recognition of mis-specified cells and possibly uncover a novel mechanism of quality control within tissues.

Prof David Whitmore

As part of our ongoing studies on the circadian clock in zebrafish, we are interested in exploring the role played by this cellular clock in the earliest stages of embryo development. We know that the clock starts to oscillate in these animals during the first day of development, and that cells in the embryo are able to detect light within hours of fertilization. What exactly light and the clock are directly regulating during development is not yet totally clear. However, we do know that one consequence of this innate rhythmicity is to regulate the timing of cell cycle events, such as DNA replication and mitosis, such that they occur primarily in the night. This contrasts to DNA repair events, which occur mainly during the day. These studies will involve the generation of transgenic animals containing luminescent reporter constructs so that we can image gene expression in the living embryo as it undergoes development. In addition, we will employ microarray analysis of early embryos in an attempt to determine the cellular processes directly influenced by light exposure.

Prof David Wilkinson

During early stages of nervous system development in vertebrates, neural tissue is subdivided into building blocks, each with a distinct regional identity. Within these subdivisions, the proliferation and differentiation of progenitor cells is regulated in time and space to form the correct number and organisation of neuronal and glial cells. In order for these precise patterns to form and be maintained, it is essential that cells do not migrate into inappropriate locations. Disruption of the mechanisms that regulate cell proliferation, differentiation or migration can lead to diseases such as cancer.
Our studies focus on the zebrafish hindbrain, which has a stereotyped segmented organisation of progenitors and neurons, to address two linked questions: how do sharp borders form and the interface of segments?; how is the differentiation of neural progenitors patterned within segments? These studies utilise the advantages of the zebrafish model for genetic manipulation and for imaging of cell behaviour. We are analysing how signaling through Eph receptors and ephrins inhibits intermingling and establishes sharp boundaries between distinct cell populations. In other studies, we have identified a pathway mediated by targeted protein degradation required for the onset of neuronal differentiation, and uncovered a novel mechanism underlying spatial patterning of neurogenesis involving FGF signaling from neurons.
Gonzalez-Quevedo R, Lee Y, Poss KD and Wilkinson DG (2010) Neuronal regulation of the spatial patterning of neurogenesis. Developmental Cell 18, 136-147
Sobieszczuk DF, Poliakov A, Xu Q and Wilkinson DG (2010) A feedback loop mediated by degradation of an inhibitor is required to initiate neuronal differentiation. Genes & Development 24, 206-218
Terriente J, Gerety SS, Watanabe-Asaka T, Gonzalez-Quevedo R and Wilkinson DG (2012) Signalling from hindbrain boundaries regulates neuronal clustering that patterns neurogenesis. Development 139, 2978-2987
Batlle E and Wilkinson DG (2012) Molecular mechanisms of cell segregation and boundary formation in development and tumorigenesis. Cold Spring Harbor Perspectives in Biology 4, a008227

Prof Stephen Wilson

Lateral view of neurons (green) and axon pathways (red) in the developing zebrafish brain

Using the zebrafish as a model system, we are studying patterning, morphogenesis and differentiation in the forebrain. One focus is to examine the mechanisms by which stem cells and progenitors transition to differentiated neurons in the eye and in the epithalamic region of the dorsal forebrain. The epithalamus is highly asymmetric between left and right sides and we have made progress in defining the signalling pathways involved in the generation of asymmetry and how such asymmetry is manifest at the level of neuronal morphology and connectivity. We have found that Fgf and Wnt signals are important for elaboration of epithalamic asymmetries but it remains uncertain how and what these pathways are doing. One potential project will be to analyse how these signalling pathways influence the production of neurons with different character between left and right sides of the brain. We are also studying how stem cells are maintained at the margin of retina and another project could be to study the role of extracellular matrix and extrinsic signals in the regulation of proliferation and differentiation in the retinal stem cell niche. Both projects would involve a broad range of molecular genetic techniques coupled with high resolution imaging approaches (www.ucl.ac.uk/zebrafish-group/).

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