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Updated: Jun 15, 2025
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Author Spotlight: Understanding Microtubule Network in Drosophila Neuromuscular Junctions
Published on: October 20, 2023
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Atypical Cadherin FAT2 Is Required for Synaptic Integrity and Motor Behaviors
Xiankun Wang1,2, Yadi Pu1,2, Jifei Miao1
1School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China.
Summary
FAT2, a protein crucial for cerebellar function, directly binds Cbln1. Its absence in mice impairs motor behaviors by weakening cerebellar synaptic strength.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Mutations in atypical FAT cadherin genes are associated with autism spectrum disorder and cerebellar ataxia in humans.
- The large size of FAT cadherin genes and proteins has hindered functional studies, leaving their roles unclear.
Purpose of the Study:
- To investigate the function of FAT2, an atypical cadherin expressed in cerebellar granule cells, in murine cerebellar function.
- To elucidate the molecular mechanisms underlying FAT2's role in synaptic integrity and motor behavior.
Main Methods:
- Investigated FAT2 expression in cerebellar granule cells.
- Examined the direct binding of FAT2 to Cbln1, a key molecule for synapse formation.
- Utilized Fat2 deletion mice to assess effects on synaptic strength and motor behaviors.
Main Results:
- FAT2 was found to directly bind Cbln1, a secreted molecule vital for synapse formation and plasticity.
- Deletion of Fat2 in mice led to weakened synaptic strength in cerebellar parallel fiber synapses.
- Fat2 deletion mice exhibited impaired motor behaviors in both sexes.
Conclusions:
- FAT2 is essential for normal motor behavior in mice.
- FAT2 likely regulates Cbln1-dependent synaptic integrity, highlighting its importance in cerebellar function.
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