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Published on: March 12, 2013
Heterozygous Loss-of-Function Variants of KCNJ10 Cause Paroxysmal Kinesigenic Dyskinesia.
Wan-Bing Sun1, Jiao-Jiao Xu1, Yu-Lan Chen1
1Department of Medical Genetics and Center for Rare Diseases, Second Affiliated Hospital, Zhejiang University School of Medicine, and Zhejiang Key Laboratory of Rare Diseases for Precision Medicine and Clinical Translation, Hangzhou, China.
Summary
Genetic variants in the potassium channel KCNJ10 cause loss-of-function of Kir4.1, confirming its role in paroxysmal kinesigenic dyskinesia (PKD). This research highlights KCNJ10 variant distribution and male predominance in PKD pathogenesis.
Area of Science:
- Neurogenetics
- Channelopathies
- Movement Disorders
Background:
- Heterozygous KCNJ10 variants are linked to paroxysmal kinesigenic dyskinesia (PKD).
- KCNJ10 encodes the potassium channel Kir4.1, crucial for neuronal function.
Purpose of the Study:
- To confirm the pathogenic role of KCNJ10 variants in PKD.
- To investigate the relationship between KCNJ10 variants and PKD phenotypes.
Main Methods:
- Whole-exome and Sanger sequencing identified KCNJ10 variants in PKD patients.
- Functional studies assessed variant pathogenicity and effects on Kir4.1.
- Literature review of KCNJ10-related PKD cases.
Main Results:
- Five novel heterozygous KCNJ10 variants were identified in PKD patients.
- These variants impaired Kir4.1 channel function and expression.
- A majority of reported KCNJ10 variants are near the C-terminus, with male predominance in affected individuals.
Conclusions:
- Heterozygous KCNJ10 variants lead to loss-of-function of Kir4.1, confirming their role in PKD.
- Variant distribution and male predominance offer insights into PKD mechanisms.
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