Centronuclear Myopathy, CNM


This muscle disorder is characterized by exercise intolerance, weight loss, and muscle wasting. CNM stems from a mutation in the PTPLA gene which codes for an enzyme important for a number of cellular processes. Loss of PTPLA function is thought to cause muscle fiber damage and death, leading to replacement of the muscle mass with scar tissue.

  • Signs and symptoms

    Signs include muscle weakness, wasting, and loss of muscle control leading to difficulty walking, eating and even breathing.

    While abnormal tendon reflexes can be observed as early as 1 month, the symptoms of exercise intolerance and weight loss can be observed by 2 to 4 months of age.

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  • Diagnosis

    Genetic testing, clinical signs, and muscle biopsy can be used to diagnose this disorder.

  • Treatment

    There is no treatment for CNM, and most owners opt for euthanasia due to poor quality of life.

  • What to do if your dog is at risk


    • Keeping your affected dog comfortable and giving them the best quality of life you can are the only actions you can take at home.

  • Genetic Information

    This mutation was first described in Labrador Retrievers.

    This disease is inherited in an autosomal recessive manner, meaning that affected dogs must have two copies of the mutation to show clinical signs.

    Gene names:

    PTPLA ‐ chr2

    Inheritance type:


  • Breeds affected

    This health condition affects the following breeds

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