Related Experiment Video
Updated: Nov 5, 2025
Analyzing Mitochondrial Transport and Morphology in Human Induced Pluripotent Stem Cell-Derived Neurons in Hereditary Spastic Paraplegia
Published on: February 9, 2020
Mutant-TMEM230-induced neurodegeneration and impaired axonal mitochondrial transport
Xiaobo Wang1,2, Gongbo Guo1, Jinru Zhang1,3
1Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
Abstract:
Parkinson's disease (PD) is a neurodegenerative disease with movement disorders including resting tremor, rigidity, bradykinesia and postural instability. Recent studies have identified a new PD associated gene, TMEM230 (transmembrane protein 230). However, the pathological roles of TMEM230 and its variants are not fully understood. TMEM230 gene encodes two protein isoforms. Isoform2 is the major protein form (~95%) in human. In this study, we overexpress isoform2 TMEM230 variants (WT or PD-linked *184Wext*5 mutant) or knockdown endogenous protein in cultured SH-5Y5Y cells and mouse primary hippocampus neurons to study their pathological roles. We found that overexpression of WT and mutant TMEM230 or knockdown of endogenous TMEM230-induced neurodegeneration and impaired mitochondria transport at the retrograde direction in axons. Mutant TMEM230 caused more severe neurotoxicity and mitochondrial transport impairment than WT-TMEM230 did. Our results demonstrate that maintaining TMEM230 protein levels is critical for neuron survival and axon transport. These findings suggest that mutant-TMEM230-induced mitochondrial transport impairment could be the early event leading to neurite injury and neurodegeneration in PD development.
Insights
Maintaining TMEM230 protein levels is crucial for neuron survival and axon transport in Parkinson's disease (PD). Mutant TMEM230 exacerbates neurotoxicity and mitochondrial transport issues, suggesting a key role in PD development.
Area of Science:
- Neuroscience
- Genetics
- Cell Biology
Background:
- Parkinson's disease (PD) is a neurodegenerative disorder characterized by motor deficits.
- The TMEM230 gene has been recently identified as associated with PD.
- The precise pathological functions of TMEM230 and its variants remain unclear.
Purpose of the Study:
- To investigate the pathological roles of TMEM230 variants (wild-type and PD-linked mutant) and endogenous TMEM230.
- To elucidate the impact of TMEM230 on neuronal survival and mitochondrial transport in the context of PD.
Main Methods:
- Overexpression of TMEM230 isoform2 variants (WT and *184Wext*5 mutant) in SH-5Y5Y cells and mouse primary neurons.
- Knockdown of endogenous TMEM230 in the same cellular models.
- Assessment of neurodegeneration and mitochondrial transport dynamics in axons.
Main Results:
- Overexpression of both WT and mutant TMEM230, as well as knockdown of endogenous TMEM230, led to neurodegeneration.
- Impaired mitochondrial transport in the retrograde direction within axons was observed.
- The PD-linked mutant TMEM230 variant induced more severe neurotoxicity and mitochondrial transport deficits compared to the wild-type.
Conclusions:
- Maintaining appropriate TMEM230 protein levels is essential for neuronal survival and axonal transport.
- Mutant TMEM230-induced mitochondrial transport impairment may represent an early pathological event in Parkinson's disease.
- TMEM230 dysfunction offers a potential therapeutic target for PD.
Related Concept Videos
01:48ATP Synthase: Mechanism
01:19Translocation of Proteins into the Mitochondria
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...