Myotonia Hereditaria (Cattle Dog Type)

Test Overview:

Myotonia congenita also known as myotonia hereditaria (Australian cattle dog type) is an inherited muscle disorder affecting dogs. The muscle cells of an affected dog are over-excitable, which causes muscles to remain contracted rather than relaxing after voluntary activity.


Musculoskeletal - Associated with muscles, bones and associated structures


Chloride voltage-gated channel 1 (CLCN1) on chromosome 16

Variant Detected:

c.2703-2704 insertion A p.Arg890Gln-frameshift888


Low-Moderate. This disease can cause some discomfort and/or dysfunction in the affected animal. It does not generally affect life expectancy.

Mode of Inheritance:

Autosomal Recessive

Research Citation(s):

Finnigan DF et al. J Vet Intern Med. A novel mutation of the CLCN1 gene associated with myotonia hereditaria in an Australian cattle dog. (2007) 21;3, 458-63. [PubMed: 17552451]

Associated Breed(s):

Australian Cattle Dog, Australian Stumpy Tail Cattle Dog, Border Collie, Mixed Breed,