Characterizing multiciliated cell differentiation through imaging and molecular approaches
Multiciliated cell differentiation involves key cellular processes, including centriole amplification and ciliogenesis. In this study(1), researchers from IBDM in Marseille combine an inducible cellular model, proteomics and microscopy to describe the temporal progression and organization of this process.
A controlled system to follow multiciliated cell differentiation
The study is based on an inducible A6-MCI cell line, allowing synchronized differentiation into multiciliated cells. This model provides a framework to investigate successive stages of the process over a defined time course.
Within this context, microscopy techniques were used alongside molecular analyses to monitor structural changes. Confocal fluorescence microscopy enabled the visualization of centriole amplification over time, revealing a progressive increase in centriole number following induction.
These observations contributed to defining a temporal sequence of events, spanning early amplification phases, deuterosome-mediated centriole production, and later stages of maturation.
Structural characterization of deuterosomes and centriole production
To examine the organization of deuterosomes and centrioles at higher resolution, the authors combined several microscopy techniques.
Transmission electron microscopy (TEM) and electron tomography provided detailed views of Xenopus deuterosome ultrastructure, revealing that these organelles are composed of multiple electron-dense units arranged in connected assemblies. Different morphologies were observed, including elongated and branched structures, with arrangements forming chain-like organizations.
In addition, expansion microscopy allowed the molecular characterization of these structures at improved spatial resolution using fluorescence imaging, complementing electron microscopy observations.
Together, these imaging modalities provided a multi-scale description of deuterosome centriole amplification platform organization.
Linking structural observations and functional perturbations
Microscopy was also used to observe ciliogenesis at the apical surface of differentiated cells. Confocal imaging confirmed the presence and spatial organization of multiple cilia following centriole maturation.
In parallel, the study combined proteomic, functional analyses and imaging approaches to relate molecular perturbations to observable structural outcomes. In particular the role of CDK7 was investigated using pharmacological inhibition. Imaging revealed that inhibition of CDK7 led to a marked reduction in centriole amplification and prevented cilia formation.
This study integrates imaging with proteomic and functional analyses to document multiciliated cell differentiation, providing a coherent view of its successive stages. By linking structural observations to their molecular context, it offers a comprehensive description of how centriole amplification and ciliogenesis are coordinated over time, and highlights the value of combining complementary approaches to investigate complex cellular processes.
(1) Camille Boutin, Olivier Rosnet, Marine Touret, Stéphane Audebert, Luc Camoin, Salomé Dussert, Nicolas Brouilly, Virginie Thomé, Jean Plumail, Denis Fortun, Jean-Paul Borg, Laurent Kodjabachian; An inducible multiciliated cell line resolves proteome dynamics and identifies CDK7 as a conserved regulator. J Cell Biol 6 April 2026; 225 (4): e202506154. doi: https://doi.org/10.1083/jcb.202506154
