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Understanding early tissue formation in the embryo and outside mimicking developmental programmes
Secondary Supervisor(s): Dr Martin Davey (Project 1), Dr Wolfram Gruhn (Project 2), Dr Falk Schneider (Project 3)
University of Registration: University of Warwick
BBSRC Research Themes:
- Understanding the Rules of Life (Stem Cells, Systems Biology)
- Integrated Understanding of Health (Regenerative Biology)
Project Outline
Embryonic tissues and organs are shaped and patterned by complex genetic, molecular and cellular mechanisms that regulate essential processes during development [1]. Dissecting such mechanisms remains challenging as the formation of tissues is controlled on different levels including genes that regulate cell-fate decisions, biochemical signalling pathways and mechanical (physical) forces that act within and between cells to define 3D form and function. Our group aims to understand how these complex processes on multiple scales are linked using the zebrafish embryo as a model system – from tissue to cells, from the cell membrane to the nucleus, and on transcriptional/genomic level. This requires an interdisciplinary approach where we combine approaches from molecular and cell biology, state-of-the-art microscopy, organoids, biophysics tools, computational image analysis, transcriptomics and theoretical modelling.
In particular, the lab is interested in essential events during development such as cell movements, cell divisions, cell shape changes, cell adhesion and cell fate specification that require feedback between biochemical and mechanical signals. However, the precise molecular and cellular mechanisms regulating these processes in the early embryo are not well understood.
Project outlines
Below are examples of potential projects available that highlight the broad scope of topics and technologies the lab:
(Project 1) Mechanisms of cell elimination during development. Cell elimination is a fundamental process during health and disease which ensures that unwanted or dying (apoptotic) cells are removed from a tissue [2]. Although cell elimination has been extensively studied in the past in cultured epithelial tissues, we still know very little about the underlying mechanisms during embryonic development and how they can affect tissue and organ formation.
Objective – Determining molecular and cellular mechanisms of cell extrusion and clearance by non-immune cells in the developing zebrafish embryo.
Methods – In vivo and ex vivo live cell imaging (confocal, multiphoton) of cell elimination processes, biochemical perturbations (antisense oligonucleotides, drugs), computational image analysis, biophysical tools (cell stretcher, atomic force microscopy), transcriptomics (RNAseq).
(Project 2) Mimicking early brain development in a dish. Recent stem cell models (gastruloids, organoids) highlight the remarkable potential to recapitulate early embryonic development in vitro through an interplay of self-organisation and the extrinsic microenvironment [3]. Beside biochemical signalling, accumulating evidence indicate a crucial involvement of mechanical and geometrical cues in tissue patterning.
Objective – Establishing controlled conditions mimicking early embryonic brain development in vitro (zebrafish, human) and investigating the role of extracellular cues and tissue geometry in cell fate specification and tissue patterning.
Methods – 3D cell culture, live imaging and immunostaining (confocal, multiphoton), chemical and physical perturbations, computational image analyses of cell morphodynamics (movements, shapes), tissue patterning and biomaterials.
(Project 3) Feedback between cell fate specification and tissue morphogenesis. Cells can sense and respond to mechanical stimuli from the microenvironment. Yet, it is still unclear how embryonic stem (ES) cells interpret specific mechanical signals and integrate their response in cell and developmental programmes [4].
Objective – Identifying how mechanical signals regulate essential processes of early progenitor cells such as cell fate specification, cell division and segregation into distinct compartments.
Methods – Live imaging/immunostaining (confocal, multiphoton), quantitative image analysis of cellular morphodynamics (movement, shape), imaging of morphogen dynamics. Biophysical characterisation of cells in vivo and ex vivo.
References
[1] Gilmour D. et al. Nature. 2017.
[2] Ohsawa S. et al. Dev Cell 2018.
[3] Shahbazi MN. et al. Science. 2019.
[4] Collinet C, Lecuit T. Nat Rev Mol Cell Biol. 2021.