Dog Congenital Stationary Night Blindness In Beagle (CSNB-Be)

Congenital Stationary Night Blindness (CSNB) in Beagles is a genetic condition that affects a dog's vision in low light. This hereditary disorder is caused by mutations in specific genes, leading to impaired retinal function. DNA testing for CSNB is crucial for responsible breeding practices, helping to prevent the condition in future generations. Owners can benefit from early detection through genetic testing, ensuring their Beagle's quality of life. Symptoms of CSNB typically include difficulty seeing in dim lighting, but dogs often adapt well. If you're considering a Beagle or already have one, investing in a DNA test for CSNB can provide peace of mind. Protect your furry companion's vision by understanding and addressing this condition today!

Abbreviation : CSNB-Be

Analysed mutation : LRIT3 c.763del

Inheritance : Autosomal Recessive

Acronym

CSNB-Be

Observed frequency

Normal

Clinical severity

Moderate

Clinical classification

Ophthalmic Diseases

Analysed mutation

LRIT3 c.763del
p.(K245Nfs*5)

Mode of inheritance

Autosomal Recessive (Complete)

Test summary:

Congenital Stationary Night Blindness (CSNB) is an inherited condition commonly found in Beagles, affecting their ability to see in low light conditions. A DNA test can identify carriers of the gene responsible for this disorder, allowing breeders to make informed decisions. Early detection helps prevent the spread of CSNB within breeding populations. Affected dogs typically exhibit normal vision during the day but struggle in dim lighting. This genetic testing is crucial for maintaining the health and well-being of future generations of Beagles.

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.

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Understanding Congenital Stationary Night Blindness (CSNB) in Beagles

Congenital Stationary Night Blindness (CSNB) is an inherited ocular condition that affects the vision of Beagles and other breeds. Characterized by a specific inability to see in low-light conditions, this condition is caused by a genetic mutation that disrupts normal retinal function. Dogs suffering from CSNB typically exhibit normal vision during the day but struggle to see at night or in dim lighting.

Genetic Basis of CSNB

CSNB is primarily caused by mutations in genes that are essential for the development and functioning of photoreceptors in the retina, particularly rods, which are responsible for vision in low light. The condition is often inherited in an autosomal recessive manner, meaning that an affected dog must inherit two copies of the mutated gene—one from each parent—to express the condition. Carriers of the mutation, possessing only one copy, generally do not show symptoms but can pass the gene to their offspring.

Clinical Signs and Symptoms

Dogs with CSNB typically present with symptoms that become apparent in puppyhood. The most notable sign is difficulty seeing in low-light environments, which can lead to hesitance or anxiety when navigating dark spaces. Owners may notice their Beagle bumping into objects or having trouble finding toys or food in poorly lit areas. Despite these challenges, affected dogs usually maintain normal daytime vision and can interact with their environment effectively during daylight hours.

Importance of DNA Testing

DNA testing for CSNB is a valuable tool for breeders and pet owners alike. By identifying carriers of the genetic mutation, breeders can make informed decisions about mating pairs to reduce the incidence of CSNB in future litters. Testing can also provide peace of mind for owners who may have concerns about their dog's vision and overall health. Early identification of CSNB can facilitate management strategies that enhance the quality of life for affected dogs.

Management and Quality of Life

While there is currently no cure for CSNB, dogs with the condition can lead fulfilling lives with appropriate management. Owners can help by providing a safe and well-lit environment, ensuring that their dogs are not put in situations where they may become disoriented or fearful due to their vision limitations. Regular veterinary check-ups and open communication with veterinarians about any changes in behavior or vision can also contribute to better management of the condition.

Conclusion

Congenital Stationary Night Blindness is a significant hereditary condition in Beagles that affects their ability to see in low light. With advancements in genetic testing, owners and breeders can better understand and manage this condition, ensuring that affected dogs receive the support and care they need to thrive. By raising awareness and promoting responsible breeding practices, the prevalence of CSNB can be reduced, benefiting the overall health of future generations of Beagles.

Breed recognized for the test : Congenital Stationary Night Blindness In Beagle (CSNB-Be)

Beagle

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 CSNB-Be

Genotype

Status

🟡 N/N

Non-carrier - No Risk

🟡 N/CSNB-Be

Carrier - No Risk

❌ CSNB-Be/CSNB-Be

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/CSNB-Be (Carrier)

CSNB-Be/CSNB-Be (Affected)

DNA Test FAQ

What does this DNA test detect?

This DNA test detects the mutation associated with Congenital Stationary Night Blindness In Beagle (CSNB) 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 LRIT3 c.763del.

Is a carrier animal necessarily affected?

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

References

Das Rueben G, Becker Doreen, Jagannathan Vidhya, Goldstein Orly, Santana Evelyn, Carlin Kendall, Sudharsan Raghavi, Leeb Tosso, Nishizawa Yuji, Kondo Mineo, Aguirre Gustavo D, Miyadera Keiko. Genome-wide association study and whole-genome sequencing identify a deletion in LRIT3 associated with canine congenital stationary night blindness. Sci Rep. 2019 Oct 2;9(1):14166. doi: 10.1038/s41598-019-50573-7.

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