Dog Screw Tail (ST)

The Screw Tail (ST) DNA test in dogs is essential for identifying genetic markers linked to screw tail deformities. This hereditary condition affects the shape of a dog’s tail, often seen in breeds like Bulldogs and Pugs. By using the Screw Tail DNA test, breeders and owners can make informed decisions to reduce the risk of passing this trait to future generations. Early detection through genetic testing helps improve breeding programs and promotes healthier puppies. The test is quick, accurate, and non-invasive, requiring only a simple cheek swab. Understanding your dog’s genetic makeup with the Screw Tail DNA test supports responsible breeding and overall canine health. Stay proactive and protect your dog’s well-being with this vital genetic screening.

Abbreviation : ST

Analysed mutation : DVL2 c.2051del

Inheritance : Autosomal Dominant

Acronym

Observed frequency

Common

Clinical classification

Tail-Related Traits

Analysed mutation

DVL2 c.2051del
p.(P684Lfs*26)

Mode of inheritance

Autosomal Dominant

Test summary:

The Screw Tail (ST) DNA test in dogs identifies a genetic mutation responsible for the distinctive twisted tail shape seen in certain breeds. This test helps breeders avoid mating two carriers, reducing the risk of puppies inheriting the deformity. It is especially important in breeds like Bulldogs and Boston Terriers, where the screw tail is common. By using the ST test, breeders can promote healthier litters and maintain breed standards. Overall, the test supports responsible breeding and canine health management.

Available from the pack : Standard

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

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

Understanding Screw Tail (ST) in Dogs

Screw Tail (ST) is a congenital condition characterized by an abnormal curvature of the tail in dogs. This condition can manifest in various degrees, ranging from mild kinks to severe twists that may lead to discomfort or health complications. The genetic basis of Screw Tail has been a focal point of research, with studies indicating that it can be inherited in certain breeds. Understanding this condition is essential for breeders and dog owners alike, as it can impact the quality of life of affected dogs.

Symptoms and Physical Characteristics

The primary symptom of Screw Tail is the noticeable deformity of the tail. In affected dogs, the tail may appear short or twisted, and its position may be lower than that of a typical tail. In some cases, the abnormality can lead to skin irritation or infections due to the tail’s inability to maintain proper hygiene. Additionally, dogs with severe Screw Tail might exhibit signs of pain or discomfort, particularly when the tail is touched or manipulated.

Potential Health Complications

While some dogs with Screw Tail may lead normal lives, others can face various health complications. One of the most common issues is chronic skin irritation, as the abnormal tail structure can trap moisture and debris. This can lead to frequent infections and require ongoing veterinary care. Furthermore, in severe cases, the abnormal tail may interfere with the dog’s ability to communicate through body language, potentially leading to behavioral issues.

Genetic Testing for Screw Tail

DNA testing for Screw Tail is an important tool for breeders and pet owners. By identifying the presence of genes associated with this condition, breeders can make informed decisions about mating pairs to minimize the risk of producing puppies with Screw Tail. Genetic testing can provide valuable insights into the likelihood of this condition appearing in future generations, thereby promoting healthier breeding practices.

Management and Treatment Options

Management of Screw Tail typically involves regular veterinary check-ups to monitor for any skin issues or infections. In cases where the tail deformity leads to significant discomfort or health problems, surgical intervention may be considered. Tail amputation is a possibility in severe cases, although it is generally viewed as a last resort. Maintaining good hygiene practices and providing proper care can help mitigate some of the complications associated with this condition.

Conclusion

Screw Tail is a condition that can affect the quality of life for some dogs, depending on the severity of the deformity. Understanding the implications of this genetic disorder is crucial for responsible breeding and ownership. With advancements in genetic testing, there is hope for reducing the prevalence of this condition and ensuring a better quality of life for affected dogs.

Breed recognized for the test : Screw Tail (ST)

American Bulldog
American Bully
American Pit Bull Terrier
American Staffordshire Terrier
Boston Terrier
Bull Terrier
Bulldog
Bullmastiff
French Bulldog
Staffordshire Bull Terrier

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 ST

Genotype

Status

🟡 N/N

Non-carrier - No effect

🟡 N/ST

Carrier - Screw Tail

❌ ST/ST

Affected - Screw Tail

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/ST (Carrier)

ST/ST (Affected)

DNA Test FAQ

What does this DNA test detect?

This DNA test detects the mutation associated with Screw Tail (ST) 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 Dominant.

Which mutation is analysed in this test?

This test analyses the mutation DVL2 c.2051del.

Is a carrier animal necessarily affected?

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

References

Mansour Tamer A, Lucot Katherine, Konopelski Sara E, Dickinson Peter J, Sturges Beverly K, Vernau Karen L, Choi Shannon, Stern Joshua A, Thomasy Sara M, Döring Sophie, Verstraete Frank J M, Johnson Eric G, York Daniel, Rebhun Robert B, Ho HsinYi Henry, Brown C Titus, Bannasch Danika L. Whole genome variant association across 100 dogs identifies a frame shift mutation in DISHEVELLED 2 which contributes to Robinow-like syndrome in Bulldogs and related screw tail dog breeds. PLoS Genet. 2018 Dec 6;14(12):e1007850. doi: 10.1371/journal.pgen.1007850. eCollection 2018 Dec.

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