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Case Report: A Novel CACNA1S Mutation Associated With Hypokalemic Periodic Paralysis in a Chinese Family
Jie-Yuan Jin1,2, Bing-Bing Guo1,2,3, Yi Dong1
1School of Life Sciences, Central South University, Changsha, China.
Insights
Hypokalemic periodic paralysis (HypoPP), a rare genetic disorder, involves muscle weakness linked to low potassium. Researchers identified a new CACNA1S gene mutation in a Chinese patient, expanding the known causes of HypoPP.
Area of Science:
- Genetics
- Neurology
- Molecular Biology
Background:
- Hypokalemic periodic paralysis (HypoPP) is a rare autosomal dominant neuromuscular disorder.
- It is characterized by episodes of muscle weakness and low serum potassium levels.
- Mutations in the CACNA1S gene, encoding a skeletal muscle calcium channel subunit, are found in over half of HypoPP patients.
Observation:
- This study reports a novel frameshift mutation (c.1364delA, p.Asn455fs) in the CACNA1S gene.
- The mutation was identified in a Chinese patient diagnosed with HypoPP.
- Targeted sequencing was employed for mutation identification.
Findings:
- The identified CACNA1S mutation expands the known spectrum of genetic defects causing HypoPP.
- This specific mutation may alter calcium channel structure and function.
- Disruption of Ca2+-mediated excitation-contraction coupling is implicated.
Implications:
- This research enhances the understanding of HypoPP's molecular basis.
- It contributes to the genetic landscape of Hypokalemic periodic paralysis.
- Findings may inform future therapeutic strategies for HypoPP patients.
Abstract:
Hypokalemic periodic paralysis (HypoPP) is a rare autosomal dominant disorder characterized by episodic flaccid paralysis with concomitant hypokalemia. More than half of patients were associated with mutations in CACNA1S that encodes the alpha-1-subunit of the skeletal muscle L-type voltage-dependent calcium channel. Mutations in CACNA1S may alter the structure of CACNA1S and affect the functions of calcium channels, which damages Ca2+-mediated excitation-contraction coupling. In this research, we identified and described a Chinese HypoPP patient with a novel frameshift mutation in CACNA1S [NM_000069.2: c.1364delA (p.Asn455fs)] by targeted sequencing. This study would expand the spectrum of CACNA1S mutations, further our understanding of HypoPP, and provided a new perspective for selecting effective treatments.
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