Study Reveals Dynein-Driven Nuclear Movement Enables Neural Crest Cell Migration Through Confined Tissues
Researchers using zebrafish embryos discovered that trunk neural crest cells use dynein motor proteins and microtubules to pull and deform the nucleus, enabling migration through tightly confined tissue spaces. This microtubule-based mechanism operates independently of the actin-myosin contractility pathway previously thought to be the primary driver of nuclear translocation through confinement. The findings suggest this dynein-driven nucleokinesis represents a conserved cellular strategy for navigating tissue constraints during nervous system development.
A preprint study published on bioRxiv describes how trunk neural crest cells in zebrafish embryos employ a dynein-driven nucleokinesis program to migrate through confined tissue environments. The researchers found that under confinement, these cells reorganize their microtubules from a perinuclear meshwork into a polarized bundle positioned ahead of the nucleus, which actively pulls and deforms the nucleus to facilitate translocation. Using laser ablation, pharmacological inhibition, and genetic approaches, the team demonstrated that dynein-dependent pulling forces enable nucleus movement through tight spaces, and critically, this process occurs independently of the Rho/ROCK/myosin II contractility pathway that has been the focus of prior work in immune and cancer cells. The study contrasts trunk neural crest cells, which navigate narrow confined spaces, with cranial neural crest cells, which migrate through loosely organized tissues, suggesting environmental constraints trigger distinct cellular strategies. These findings propose that microtubule-based nucleokinesis represents a fundamental and evolutionarily conserved mechanism for navigating tissue confinement during nervous system development.
Limitations & open questions
The study is a preprint and has not undergone peer review. The authors do not discuss potential limitations of the zebrafish model for extrapolating findings to mammalian neural crest migration, nor do they address whether this dynein-driven mechanism might operate in other cell types or developmental contexts beyond neural crest migration.
What different sources said
- bioRxivCenter
A dynein-driven nucleokinesis program enables neural crest migration through confined tissues in vivo
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