Inherited Myopathy of Great Danes (IMGD)

Quick Summary

Inherited myopathy of Great Danes (IMGD) is a rapidly progressive muscle myopathy characterized by exercise intolerance and progressive muscle atrophy.

Phenotype: Inherited myopathy of Great Danes (IMGD) is a rapidly progressive muscle myopathy with an age of onset around six months. Affected dogs exhibit exercise intolerance and progressive muscle atrophy. Research data suggest that only 20% of affected dogs survive to adulthood with acceptable quality of life.

Mode of Inheritance: Autosomal recessive

Alleles: N = Normal, IM = Inherited myopathy of Great Danes

Breeds appropriate for testing: Great Dane

Explanation of Results:

  • Dogs with N/N genotype will not have inherited myopathy of Great Danes and cannot transmit this variant to their offspring.
  • Dogs with N/IM genotype will not be affected by inherited myopathy of Great Danes, but are carriers. They will transmit this inherited myopathy variant to 50% of their offspring. Matings between two carriers are predicted to produce 25% inherited myopathy-affected puppies.
  • Dogs with IM/IM genotype will have inherited myopathy of Great Danes.

Results of this test can be submitted to the OFA (Orthopedic Foundation for Animals)

Price

$50 one test per animal
$30 as additional test (same animal)
$45 for 3 or more dogs

Additional Details

Inherited myopathy of Great Danes (IMGD) is a rapidly progressive muscle myopathy with an age of onset around six months. The disease is inherited in an autosomal recessive fashion thus two copies of the IMGD mutation are needed for a dog to be affected.

IMGD results from a single base change in the bridging integrator 1 (BIN1) gene. Affected dogs exhibit exercise intolerance and progressive muscle atrophy. Research data suggest that only 20% of affected dogs survive to adulthood with acceptable quality of life. Dogs with one normal and one mutated BIN1 gene (carriers) are unaffected, but breeding two carriers together would be predicted to produce 25% affected offspring and 50% carriers.

Testing for IMGD assists owners and breeders in identifying affected and carrier dogs. Breeders can use results from the test as a tool for selection of mating pairs to avoid producing affected dogs.

Turnaround Time
3-6 business days

Species

Dog

Breed

Type of Test

Results Reported As
Test Result Inherited Myopathy of Great Danes
N/N Normal. No copies of the IMGD mutation.
N/IM Carrier. 1 copy of the IMGD mutation. Dog is normal.
IM/IM Affected. 2 copies of the IMGD mutation.
References

Davies, S.E., Davies, D.R., Richards, R.B., & Bruce, W.J. (2008). Inherited myopathy in a Great Dane. Australian Veterinary Journal, 86(1-2), 43-45. doi: 10.1111/j.1751-0813.2007.00202.x

Böhm, J., Vasli, N., Maurer, M., Cowling, B., Shelton, G.D., Kress, W., Toussaint, A., Prokic, I., Schara, U., Anderson, T.J., Weis, J., Tiret, L., & Laporte, J. (2013). Altered splicing of the BIN1 muscle-specific exon in humans and dogs with highly progresive centronuclear myopathy. PLoS Genetics, 9(6):e1003430. doi: 10.1371/journal.pgen.1003430