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Analyzing Mitochondrial Transport and Morphology in Human Induced Pluripotent Stem Cell-Derived Neurons in Hereditary Spastic Paraplegia
Published on: February 9, 2020
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JASPAC: Japan Spastic Paraplegia Research Consortium
Kishin Koh1, Hiroyuki Ishiura2, Shoji Tsuji3
1Department of Neurology, Graduate School of Medical Sciences, University of Yamanashi, 409-3898 Yamanashi, Japan. jixin@yamanashi.ac.jp.
Brain Sciences
|August 15, 2018
Summary
Hereditary spastic paraplegias (HSPs) are complex neurodegenerative disorders. The JASPAC study identified causative genes in 65% of Japanese HSP families, highlighting genetic heterogeneity and the need for further research.
Area of Science:
- Neurogenetics
- Molecular Epidemiology
Background:
- Hereditary spastic paraplegias (HSPs) are a group of inherited neurodegenerative disorders.
- Characterized by progressive lower limb weakness and spasticity.
- Over 80 genes are implicated, indicating significant genetic heterogeneity.
Purpose of the Study:
- To investigate the molecular epidemiology of HSPs in Japan.
- To identify causative genes and understand molecular pathologies.
- To analyze genetic variants in Japanese HSP patient cohorts.
Main Methods:
- The Japan Spastic Paraplegia Research Consortium (JASPAC) collected data from 714 HSP families.
- Genetic analysis was performed on 488 index patients.
- Pathogenic variants were identified using genetic sequencing and analysis.
Main Results:
- Causative genes were identified in 279 out of 488 HSP patients.
- Autosomal dominant inheritance was observed in 65% of families (178 families).
- SPG4, SPG3A, SPG31, SPG11, and SPG10 were the most frequent genetic causes identified.
Conclusions:
- Genetic analysis revealed the specific causative genes in a significant portion of Japanese HSP patients.
- A substantial percentage of patients, particularly those with autosomal recessive or sporadic forms, remain genetically unresolved.
- Further research is needed to discover novel HSP genes and elucidate underlying molecular mechanisms.
