Rhabdomyolysis and fluctuating asymptomatic hyperCKemia associated with CACNA1S variant

C. Anandan, M. A. Cipriani, R. S. Laughlin, Z. Niu, M. Milone

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Background and purpose: CACNA1S encodes Cav1.1, a voltage sensor for muscle excitation−contraction coupling, which activates the ryanodine receptor 1 (RYR1) leading to calcium release from the sarcoplasmic reticulum. CACNA1S mutations cause hypokalemic periodic paralysis, malignant hyperthermia and congenital myopathy. RYR1 mutations result in congenital myopathy, malignant hyperthermia and rhabdomyolysis. Methods: The aim was to describe a novel phenotype associated with a CACNA1S variant at a site previously linked to hypokalemic periodic paralysis. Results: The patient presented with fluctuating asymptomatic creatine kinase elevation after an episode of rhabdomyolysis but has no history of periodic paralysis. His muscle biopsy showed core-like structures occurring mainly in type 2 fibers. He carries a novel Cav1.1 variant (p.Arg528Leu) affecting a highly conserved amino acid. Different mutations at the same location cause hypokalemic periodic paralysis. Conclusion: This case underscores the similarity between the phenotypes caused by mutations in two functionally linked proteins, RYR1 and Cav1.1.

Original languageEnglish (US)
Pages (from-to)417-419
Number of pages3
JournalEuropean Journal of Neurology
Issue number2
StatePublished - Feb 2018


  • Ca1.1
  • cores
  • hyperCKemia
  • rhabdomyolysis

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology


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