Dog Centronuclear Myopathy In Labrador Variant 2 (CNM-L2)

The Centronuclear Myopathy In Labrador Variant 2 (CNM) DNA test is essential for responsible Labrador owners and breeders. This genetic test detects the presence of the CNM mutation, a hereditary muscle disorder affecting Labradors. Early identification through DNA testing helps prevent the breeding of affected dogs, promoting healthier litters. CNM causes muscle weakness and mobility issues, impacting a dog’s quality of life. By using the CNM DNA test, breeders can make informed decisions to reduce the incidence of this condition. Regular testing supports the overall health and longevity of Labrador Retrievers. Ensure your Labrador’s well-being with accurate CNM genetic screening today.

Abbreviation : CNM-L2

Analysed mutation : HACD1 insCACACAAAGGTTT]

Inheritance : Autosomal Recessive

Acronym

CNM-L2

Observed frequency

Rare

Clinical severity

Moderate

Clinical classification

Muscular Diseases

Analysed mutation

HACD1 insCACACAAAGGTTT]

Mode of inheritance

Autosomal Recessive

Test summary:

The Centronuclear Myopathy In Labrador Variant 2 (CNM) DNA test detects a genetic mutation responsible for a muscle disorder in Labrador Retrievers. This condition causes muscle weakness and difficulty with movement, often appearing in young dogs. Early identification through testing helps breeders avoid passing the mutation to offspring. Responsible breeding practices reduce the incidence of CNM and improve the overall health of the breed. DNA testing is a valuable tool for maintaining the well-being of Labradors.

Available from the pack : Basic

This DNA test is included starting from our pack Basic — and is also part of the packs Basic, Standard, Advanced, Complete.

View DNA Test Packs →

Choose the pack that best fits your breeding or health strategy of your animals.

Understanding Centronuclear Myopathy in Labrador Variant 2 (CNM)

Centronuclear Myopathy in Labrador Variant 2 (CNM) is a genetic condition that primarily affects the muscle function in dogs, particularly in the Labrador Retriever breed. This myopathy is characterized by the presence of abnormal muscle fibers, which lead to muscle weakness and reduced mobility. The condition is caused by mutations in specific genes that are crucial for muscle development and maintenance.

Clinical Signs of CNM

The clinical signs of CNM typically appear in young dogs, often manifesting between six months and two years of age. Affected dogs may exhibit symptoms such as muscle weakness, difficulty in rising, exercise intolerance, and a tendency to become easily fatigued. Additionally, they may have a characteristic dropped posture due to weakness in the muscles of the hind limbs. The severity of symptoms can vary significantly among affected individuals.

Pathophysiology of CNM

At the cellular level, CNM is associated with abnormalities in the structure and function of muscle cells. The condition leads to the accumulation of centronuclear myopathy, where the nuclei of muscle fibers are located in the center rather than at the periphery. This abnormal positioning can impair normal muscle function and regeneration, ultimately resulting in progressive muscle weakness over time.

Diagnosis of CNM

Diagnosing Centronuclear Myopathy involves a combination of clinical evaluation and genetic testing. Veterinarians typically assess the dog’s medical history and perform a thorough physical examination. Muscle biopsies may also be conducted to observe the characteristic changes in muscle fibers. However, the definitive diagnosis is made through genetic testing that identifies the specific mutations associated with CNM.

Treatment and Management

Currently, there is no cure for Centronuclear Myopathy, and treatment options are primarily focused on managing symptoms and improving the quality of life for affected dogs. Supportive care, including physical therapy and weight management, can help maintain muscle function and mobility. Additionally, regular veterinary check-ups are essential for monitoring the condition and addressing any complications that may arise.

Importance of Genetic Testing

Genetic testing plays a vital role in the management of CNM, particularly for breeding decisions. By identifying carriers of the CNM mutation, breeders can make informed choices to reduce the risk of producing affected offspring. This proactive approach is crucial for controlling the prevalence of this condition in the population and promoting the overall health of the breed.

Conclusion

Centronuclear Myopathy in Labrador Variant 2 is a significant genetic disorder that impacts muscle function in dogs. Understanding the condition, its symptoms, and the importance of genetic testing can aid in better management and care for affected animals. Ongoing research and advancements in veterinary genetics continue to enhance our understanding of CNM, paving the way for potential future therapies and improved outcomes for affected dogs.

Breed recognized for the test : Centronuclear Myopathy In Labrador Variant 2 (CNM-L2)

Australian Cobberdog
Golden Retriever
Lab/Golden Cross
Labradoodle
Labrador Retriever
UK Breed Council Labrador Retriever

Interpretation of genotypes Genotype Status Learn more about the interpretation of genotypes FAQ: understanding the interpretation of result What does “Clear” mean? The animal does not carry the mutation. It will not develop the disease and will not pass it on. Is a “Carrier” serious? No. The animal is generally healthy but can transmit the mutation to its offspring. What if an animal is “Affected”? It carries two mutated copies. Clinical signs are expected depending on the disease. It should not be bred. Why are there differences between male / female? Some diseases are sex-linked, so their expression varies depending on the animal’s sex. The animal has two normal copies of the gene. No risk of developing or transmitting the disease. Heterozygous carrier: one mutated copy. The animal is usually not clinically affected but can pass the mutation to offspring. Male carrier or affected depending on the inheritance mode. Males have only one X or Y chromosome. Heterozygous female carrier: one mutated copy. She can pass the mutation on and may sometimes show mild clinical signs depending on the condition. Two mutated copies of the gene. The animal is at risk of developing the associated condition.

🧬 Interpretation of genotypes CNM-L2

Genotype

Status

🟡 N/N

Non-carrier - No Risk

🟡 N/CNM-L2

Carrier - No Risk

❌ CNM-L2/CNM-L2

Affected - At Risk

FAQ: understanding the interpretation

What does “Clear” mean?

The animal does not carry the mutation. It will not develop the disease and will not pass it on.

Is a “Carrier” serious?

No. The animal is generally healthy but can transmit the mutation to its offspring.

What if an animal is “Affected”?

It carries two mutated copies. Clinical signs are expected depending on the disease. It should not be bred.

Why are there differences between male / female?

Some diseases are sex-linked, so their expression varies depending on the animal’s sex.

Genotype Forecast for Offspring Mother Father Non-carrier Carrier Affected Favorable cross: majority Carrier risk is predominant. Majority affected Filter by mother's genotype Filter by father's genotype All Predict Offspring The animal has two normal copies of the gene. No risk of developing or transmitting the disease. Heterozygous carrier: one mutated copy. The animal is usually not clinically affected but can pass the mutation to offspring. Male carrier or affected depending on the inheritance mode. Males have only one X or Y chromosome. Heterozygous female carrier: one mutated copy. She can pass the mutation on and may sometimes show mild clinical signs depending on the condition. Two mutated copies of the gene. The animal is at risk of developing the associated condition.

Predict Offspring

Filter by mother's genotype Filter by father's genotype

N/N (Non-carrier)

N/CNM-L2 (Carrier)

CNM-L2/CNM-L2 (Affected)

DNA Test FAQ

What does this DNA test detect?

This DNA test detects the mutation associated with Centronuclear Myopathy In Labrador Variant 2 (CNM-L2) in order to identify clear, carrier, or at-risk animals.

Why test a breeding animal?

DNA testing helps breeders plan safer matings and reduce the risk of transmitting the mutation to offspring.

What is the inheritance mode of this test?

The inheritance mode reported for this test is Autosomal Recessive.

Which mutation is analysed in this test?

This test analyses the mutation HACD1 insCACACAAAGGTTT].

Is a carrier animal necessarily affected?

Not necessarily. Interpretation depends on the inheritance pattern and the resulting genotype.

References

Pelé Manuel, Tiret Laurent, Kessler JeanLouis, Blot Stéphane, Panthier JeanJacques. SINE exonic insertion in the PTPLA gene leads to multiple splicing defects and segregates with the autosomal recessive centronuclear myopathy in dogs. Hum Mol Genet. 2005 Jun 1;14(11):1417-27. doi: 10.1093/hmg/ddi151. Epub 2005 Apr 13.

My DNA Portal