Parameter-free molecular super-structures quantification in single-molecule localization microscopy.
Parameter-free molecular super-structures quantification in single-molecule localization microscopy.
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DOI:
10.1083/jcb.202010003
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发表时间:
2021-05-03
期刊:
影响因子:
--
通讯作者:
Michieletto D
中科院分区:
文献类型:
--
作者:
Marenda M;Lazarova E;van de Linde S;Gilbert N;Michieletto D
Marenda et al. introduce a parameter-free algorithm to quantify super-structures and connected clusters in SMLM datasets. The algorithm is tested on simulated and experimental datasets, demonstrating that it can be used as an unbiased tool to extract information beyond simple clustering. Understanding biological function requires the identification and characterization of complex patterns of molecules. Single-molecule localization microscopy (SMLM) can quantitatively measure molecular components and interactions at resolutions far beyond the diffraction limit, but this information is only useful if these patterns can be quantified and interpreted. We provide a new approach for the analysis of SMLM data that develops the concept of structures and super-structures formed by interconnected elements, such as smaller protein clusters. Using a formal framework and a parameter-free algorithm, (super-)structures formed from smaller components are found to be abundant in classes of nuclear proteins, such as heterogeneous nuclear ribonucleoprotein particles (hnRNPs), but are absent from ceramides located in the plasma membrane. We suggest that mesoscopic structures formed by interconnected protein clusters are common within the nucleus and have an important role in the organization and function of the genome. Our algorithm, SuperStructure, can be used to analyze and explore complex SMLM data and extract functionally relevant information.
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