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Updated: Sep 1, 2025
Author Spotlight: Using Zebrafish to Explore Microglia Migration During Brain Development
Published on: May 17, 2024
dock8 deficiency attenuates microglia colonization in early zebrafish larvae
Linxiu Wu1, Rongtao Xue2, Jiahao Chen3
1School of Medicine, South China University of Technology, Guangzhou, Guangdong, 510006, China.
Abstract:
Microglia are tissue-resident macrophages that carry out immune functions in the brain. The deficiency or dysfunction of microglia has been implicated in many neurodegenerative disorders. DOCK8, a member of the DOCK family, functions as a guanine nucleotide exchange factor and plays key roles in immune regulation and neurological diseases. The functions of DOCK8 in microglia development are not fully understood. Here, we generated zebrafish dock8 mutants by CRISPR/Cas9 genome editing and showed that dock8 mutations attenuate microglia colonization in the zebrafish midbrain at early larvae stages. In vivo time-lapse imaging revealed that the motility of macrophages was reduced in the dock8 mutant. We further found that cdc42/cdc42l, which encode the small GTPase activated by Dock8, also regulate microglia colonization in zebrafish. Collectively, our study suggests that the Dock8-Cdc42 pathway is required for microglia colonization in zebrafish larvae.
Insights
The Dock8-Cdc42 pathway is crucial for microglia colonization in zebrafish. Dock8 deficiency impairs macrophage motility and brain immune cell development, impacting neurological health.
Area of Science:
- Neuroscience
- Immunology
- Developmental Biology
Background:
- Microglia, the brain's resident immune cells, are vital for neurological health.
- Microglia dysfunction is linked to neurodegenerative diseases.
- DOCK8 is implicated in immune regulation and neurological disorders, but its role in microglia development is unclear.
Purpose of the Study:
- To investigate the function of DOCK8 in microglia development and colonization.
- To elucidate the molecular mechanisms underlying DOCK8's role in microglia.
Main Methods:
- CRISPR/Cas9 genome editing to generate zebrafish dock8 mutants.
- In vivo time-lapse imaging to observe macrophage motility.
- Analysis of microglia colonization in zebrafish larvae.
Main Results:
- Zebrafish dock8 mutations significantly reduced microglia colonization in the midbrain.
- Macrophage motility was impaired in dock8 mutant zebrafish.
- The Dock8-activated small GTPase pathway (cdc42/cdc42l) also regulates microglia colonization.
Conclusions:
- The Dock8-Cdc42 pathway is essential for proper microglia colonization in zebrafish larvae.
- This pathway plays a critical role in the development and migration of brain immune cells.
