We study a simple but unsolved question: what did the first animal cells and organisms look like? What was their form and function? How did morphogenesis first emerge from the behavior of individual cells, and how was it subsequently modified at the dawn of animal evolution? While the very first multicellular ancestors of animals were likely microscopic (and too small to leave fossils), we can gain insights into these questions via the comparative study of living groups. Our lab investigates the cell biology, morphogenesis and behavior of choanoflagellates, the closest known living relatives of animals. Choanoflagellates can switch between unicellular and multicellular lifestyles, display temporal cell differentiation, and have recently become amenable to functional molecular genetics. We want to understand how the cell shape of choanoflagellates is controlled, how it dynamically responds to the environment, and how choanoflagellates sometimes develop into multicellular colonies capable of emergent collective behavior. We address these questions through an interdisciplinary and comparative approach, applying concepts and tools from diverse fields (cell biology, developmental biology, molecular biology, biophysics) to multiple species of choanoflagellates – including the model species S. rosetta and M. brevicollis, and the recently discovered C. flexa.
Membres de l'équipe
