Abstract
Microfluidic methodologies allow for automatic and high-throughput replicative lifespan (RLS) determination of single budding yeast cells. However, the resulted RLS is highly impacted by the robustness of experimental conditions, especially the microfluidic yeast-trapping structures, which are designed for cell retention, growth, budding, and daughter cell dissection. In this work, four microfluidic yeast-trapping structures, which were commonly used to immobilize mother cells and remove daughter cells for entire lifespan of budding yeast, were systematically investigated by means of finite element modeling (FEM). The results from this analysis led us to propose an optimized design, the yeast rotation (YRot) trap, which is a “leaky bowl”–shaped structure composed of two mirrored microcolumns facing each other. The YRot trap enables stable retention of mother cells in its “bowl” and hydrodynamic rotation of buds into its “leaky orifice” such that matured progenies can be dissected in a coincident direction. We validated the functions of the YRot trap in terms of cell rotation and daughter dissection by both FEM simulations and experiments. With the integration of denser YRot traps in microchannels, the microfluidic platform with stable single-yeast immobilization, long-term cell culturing, and coincident daughter dissection could potentially improve the robustness of experimental conditions for precise RLS determination in yeast aging studies.
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Acknowledgements
We thank Dr. Fabian Rudolf in D-BSSE, ETH Zurich, Switzerland, for providing us the yeast cell strain as a gift.
Funding
This work was supported by the National Key R&D Program of China (No. 2018YFF01012100), the National Natural Science Foundation of China (No. 61774036, 51972058, 11774051), and the Fundamental Research Funds for the Central Universities.
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Xu, X., Zhu, Z., Wang, Y. et al. Investigation of daughter cell dissection coincidence of single budding yeast cells immobilized in microfluidic traps. Anal Bioanal Chem 413, 2181–2193 (2021). https://doi.org/10.1007/s00216-021-03186-x
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DOI: https://doi.org/10.1007/s00216-021-03186-x

