Study Reveals Dynein-Driven Nuclear Movement Enables Neural Crest Cell Migration Through Confined Tissues
Researchers using zebrafish embryos have discovered that trunk neural crest cells employ a microtubule- and dynein-powered mechanism to pull their nuclei through narrow tissue spaces during migration. Unlike previously described pathways relying on actin and Myosin II contractility, this process operates independently of Rho/ROCK/Myosin II signaling. The finding identifies a previously unknown mode of nuclear translocation that may represent a fundamental strategy for cells navigating confined environments during vertebrate nervous system development.
A new study posted to bioRxiv demonstrates that trunk neural crest (tNC) cells in zebrafish use a dynein motor-driven nucleokinesis program to migrate through confined tissue spaces in vivo. When these cells encounter confinement, their microtubules reorganize from a perinuclear meshwork into a polarized bundle anchored to the centrosome and positioned ahead of the nucleus, which then actively pulls and deforms the nucleus forward. Laser ablation experiments confirmed that this microtubule array exerts active pulling forces on the nucleus. Pharmacological and genetic experiments showed that this mechanism depends on cytoplasmic dynein but is independent of the Rho/ROCK/Myosin II contractility pathway previously implicated in confined migration of immune and cancer cells. By contrast, cranial neural crest cells, which migrate through loosely organized tissues, do not appear to require this same confined-migration program. The authors propose that microtubule-based nucleokinesis is an evolutionarily conserved strategy broadly relevant to nervous system development, including both central and peripheral components.
What's missing
As a preprint, this work has not yet undergone formal peer review, so findings should be treated as preliminary. It also remains unclear whether the same mechanism operates in mammalian neural crest cells or other vertebrate species beyond zebrafish. Long-term functional consequences of disrupting this pathway for peripheral nervous system assembly are not assessed.
What different sources said
- bioRxivCenter
Neural Innervation Invigorates Yolk Sac Biological Functions beyond Nutrient Reservoir during Zebrafish Embryo Development
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