{"title":"GABAergic neuronal dysfunction underlies tremor in a Drosophila model of Spinocerebellar ataxia 3.","authors":"Animesh Banerjee, Moumita Chatterjee, Kah Junn Tan, Shermaine Tay, Kaibo Duan, Anand Kumar Andiappan, Shanshan Wu Howland, Yoshinori Aso, Sherry Shiying Aw","doi":"10.1242/dmm.052329","DOIUrl":null,"url":null,"abstract":"<p><p>Tremor is a common movement disorder associated with several neurodegenerative diseases, yet its mechanisms are not well understood. Using a machine learning method, FLLIT, we previously characterised gait and tremor signatures in the Drosophila model for Spinocerebellar ataxia 3 (SCA3), and found them to be analogous to human SCA3. Here, we carried out a functional screen for neuronal populations that underlie tremor, and found that dysfunction of a specific population of neurons in the ventral nerve cord (VNC) is necessary and sufficient for tremor. Adult-onset expression of mutant ATXN3 in or genetic hypo-activation of these neurons leads to tremor, indicating their important role in adult motor control. RNAseq and functional experiments showed that dysfunction of GABAergic neurons, and not other neurotransmitter populations tested, causes tremor. Finally, we identified a small subset of approximately 30 predominantly GABAergic neurons within the adult VNC that are essential for smooth walking. This study demonstrates that tremor in SCA3 flies arises from GABAergic dysfunction, and that FLLIT can be used to dissect motor control mechanisms.</p>","PeriodicalId":11144,"journal":{"name":"Disease Models & Mechanisms","volume":" ","pages":""},"PeriodicalIF":3.3000,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Disease Models & Mechanisms","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1242/dmm.052329","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CELL BIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Tremor is a common movement disorder associated with several neurodegenerative diseases, yet its mechanisms are not well understood. Using a machine learning method, FLLIT, we previously characterised gait and tremor signatures in the Drosophila model for Spinocerebellar ataxia 3 (SCA3), and found them to be analogous to human SCA3. Here, we carried out a functional screen for neuronal populations that underlie tremor, and found that dysfunction of a specific population of neurons in the ventral nerve cord (VNC) is necessary and sufficient for tremor. Adult-onset expression of mutant ATXN3 in or genetic hypo-activation of these neurons leads to tremor, indicating their important role in adult motor control. RNAseq and functional experiments showed that dysfunction of GABAergic neurons, and not other neurotransmitter populations tested, causes tremor. Finally, we identified a small subset of approximately 30 predominantly GABAergic neurons within the adult VNC that are essential for smooth walking. This study demonstrates that tremor in SCA3 flies arises from GABAergic dysfunction, and that FLLIT can be used to dissect motor control mechanisms.
期刊介绍:
Disease Models & Mechanisms (DMM) is an online Open Access journal focusing on the use of model systems to better understand, diagnose and treat human disease.