High-speed multifocal plane fluorescence microscopy for three-dimensional visualisation of beating flagella.

Journal of Cell Science
Benjamin J Walker, Richard John Wheeler

Abstract

Analysis of flagellum and cilium beating in three dimensions (3D) is important for understanding cell motility, and using fluorescence microscopy to do so would be extremely powerful. Here, high-speed multifocal plane fluorescence microscopy, where the light path is split to visualise multiple focal planes simultaneously, was used to reconstruct Trypanosoma brucei and Leishmania mexicana movement in 3D. These species are uniflagellate unicellular parasites for which motility is vital. It was possible to use either a fluorescent stain or a genetically-encoded fluorescent protein to visualise flagellum and cell movement at 200 Hz frame rates. This addressed two open questions regarding Trypanosoma and Leishmania flagellum beating, which contributes to their swimming behaviours: 1) how planar is the L. mexicana flagellum beat, and 2) what is the nature of flagellum beating during T. brucei 'tumbling'? We showed that L. mexicana has notable deviations from a planar flagellum beat, and that during tumbling the T. brucei flagellum bends the cell and beats only in the distal portion to achieve cell reorientation. This demonstrates high-speed multifocal plane fluorescence microscopy as a powerful tool for the analysis of beating flagella.

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Citations

Oct 24, 2020·Journal of Cell Science·Ziyin WangRichard John Wheeler
Jul 6, 2021·Biomedical Optics Express·Soheil MojiriJörg Enderlein
Jul 30, 2021·Nature Communications·Jan N HansenLuis Alvarez
Aug 7, 2021·Frontiers in Cell and Developmental Biology·Eamonn A GaffneyBenjamin J Walker

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Methods Mentioned

BETA
fluorescence microscopy
FCS

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