Dr Jens Januschke
Cell and Developmental Biology, School of Life Sciences
Establishment of cell polarity in rapidly dividing Drosophila stem cells
The ability to generate different cell types is a fundamental feature of multicellular life forms. Asymmetric cell division (ACD) is an important process that helps to produce the repertoire of cell types. ACD is particularly important for the function of stem cells as it provides the bases for self-renewing fate generating divisions during development as well as for tissue homeostasis in the adult. Faulty stem cell division has dramatic consequences for the integrity of organisms as it can compromise normal initiation and maintenance of tissues. We are interested in the dynamics of ACD in stem cells. A long-term goal is to understand how cycling stem cells robustly control ACD to prevent errors in cell fate generation.
We use Drosophila neural stem cells of the developing central nervous system called, neuroblasts, to study this process. Neuroblasts are highly proliferative and provide a well-characterised model system for ACD. As in many other stem cells, ACD in neuroblasts relies on the establishment of a polarity axis that governs the orientation of the mitotic spindle to transmit cell fate information differentially to the resulting daughter cells upon cytokinesis (see Video 1). However, progression through the cell cycle is accompanied by dramatic subcellular rearrangements (Video 1), raising the question of how continuity of cell polarity is ensured from one cell cycle to the next.
Imaging living neuroblasts in primary cell culture as well as in whole mount explants of the developing brain, we document and measure the dynamics of cell polarisation during consecutive neuroblast cycles. We focus particularly on the subcellular localisation of mRNA’s to determine their contribution to the establishment of cell polarity and cell fate specification.
Ingo Hein, Jens Januschke, Steve Land, Beatriz Baragana, Sheriar Hormuzdi and Susan Wyllie promoted as part of the 2020 Annual Review process for academic staff.
The postdoc work of Nicolas Loyer in the Januschke lab, Division of Cell and Developmental Biology, was recently published in Nature Communications.
Cells need to be able to control the localization of their content to fulfil specific functions.
Dynamics of cell polarisation
|Personal Fellowships / Sir Henry Dale Research Fellowship (renewal)||2017|
|Personal Fellowships / Sir Henry Dale Research Fellowship||2013|