Skeletal muscle channelopathies

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 Inclusion criteria:

  • Episodic flaccid paralysis or weakness and/or myotonia
  • May develop progressive, usually proximal, weakness
  • Electrophysiology including long and short exercise testing
  • Intra-attack potassium documented whenever possible
  • Normal renal function and thyroid function

 Exclusion criteria:

  • Primary renal or endocrine problem that may be causative
  • Associated loss of consciousness with attacks

Prior genetic testing guidance 

  •  Results should have been reviewed for all genetic tests undertaken, including disease-relevant genes in exome sequencing data. The patient is not eligible if they have a molecular diagnosis for their condition.
  •  Genetic testing should continue according to routine local practice for this phenotype regardless of recruitment to the project; results of these tests must be submitted via the ‘Genetic investigations’ section of the data capture tool to allow comparison of WGS with current standard testing.

PLEASE NOTE: The sensitivity of WGS compared to current diagnostic genetic testing has not yet been established. It is therefore important that tests which are clinically indicated under local standard practice continue to be carried out.

Prior genetic testing genes

Testing of the following genes should be carried out PRIOR TO RECRUITMENT where this is in line with current local practice:

  • Myotonia: DMPK, CNBP, SCN4A, CLCN1 (including MLPA)
  • Episodic weakness: CACNA1S, SCN4A, KCNJ2

Closing statement

These requirements will be kept under continual review during the main programme and may be subject to change.

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