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TRIM-9 functions in the UNC-6/UNC-40 pathway to regulate ventral guidance
Song Song1, Qinglan Ge, Jinbo Wang
1Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
Journal of Genetics and Genomics = Yi Chuan Xue Bao
|February 23, 2011
Summary
TRIM-9 protein is crucial for guiding neuron growth in worms and flies by acting in the UNC-6/Netrin pathway. This conserved function, involving E3 ubiquitin ligase activity, is essential for proper nervous system development.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- TRIpartite Motif (TRIM) family proteins are multi-domain proteins involved in various biological processes.
- The TRIM-9/C-I subfamily, including TRIM-9, MID1, and MID2, plays roles in neuronal functions and is linked to neurological diseases.
Purpose of the Study:
- To investigate the conserved functions of C-I TRIM proteins in invertebrates, specifically TRIM-9.
- To elucidate the molecular mechanisms by which TRIM-9 influences neuronal guidance.
Main Methods:
- Analysis of Caenorhabditis elegans and Drosophila trim-9 mutants.
- Genetic analyses to identify TRIM-9's role in the UNC-6-UNC-40 pathway.
- In vitro assays to determine TRIM-9's E3 ubiquitin ligase activity.
Main Results:
- C. elegans trim-9 mutants showed defects in ventral nerve guidance (HSN) and touch neuron (AVM) development.
- TRIM-9 acts upstream of MIG-10 in the UNC-40 pathway, as MIG-10's asymmetric localization was abolished in trim-9 mutants.
- TRIM-9 possesses in vitro E3 ubiquitin ligase activity essential for its in vivo function.
- Drosophila trim-9 is required for sensory neuron axon guidance towards the midline, and Frazzled (a Netrin receptor) overexpression rescues these defects.
Conclusions:
- TRIM-9 function in neuronal guidance is evolutionarily conserved in invertebrates.
- TRIM-9 is a key component of the UNC-6/Netrin attraction pathway, acting upstream of MIG-10.
- TRIM-9's E3 ubiquitin ligase activity is critical for its role in neuronal development and guidance.
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