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This study reveals that cell diversity during early embryonic development in the marine snail Crepidula atrasolea arises not only from new gene transcription but also from unequal distribution of existing messenger RNAs between daughter cells. Using advanced 3D spatial transcriptomics (MERFISH) and live imaging of over 40 embryos, researchers found that many mRNAs form subcellular aggregates during cell division that attach to microtubules and segregate asymmetrically, producing six transcriptomically distinct cell types by the 24-cell stage. This mRNA partitioning mechanism allows single cell divisions to simultaneously increase both cell number and cellular diversity.
Why it matters
This challenges the traditional view that cell differentiation during development primarily relies on turning genes on and off, showing instead that pre-existing mRNAs can be strategically distributed to create cell diversity. Understanding this mechanism could inform developmental biology, regenerative medicine, and provide insights into how complex organisms develop from single cells with efficiency and precision.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Cell type diversification during development is often attributed to differential gene transcription. Here, we show that, during Crepidula atrasolea embryogenesis, transcriptomically distinct cell types arise through differential distribution of pre-existing mRNAs. Combining immunofluorescence, live imaging, and whole-mount 3D spatial transcriptomics (MERFISH) of over 40 embryos, we show that many mRNAs form subcellular aggregates during mitosis, which segregate asymmetrically between daughter cells through microtubule associations. Cell divisions thus simultaneously increase cell number and diversity, producing six transcriptomically distinct cell quartets in the 24-cell stage embryo. We modeled aggregate compositions across cell divisions using transcript abundance and quantified transcript-specific affinity. These results establish mRNA sorting and inheritance as a scalable cell type patterning mechanism and provide a framework for investigating how mRNA segregation shapes animal development.
Source: 3D MERFISH reveals cell-type diversity generated by mRNA partitioning in spiralian embryogenesis