Horse Androgen Insensitivity Syndrome In Quarter Horse (AIS-QH)

The Androgen Insensitivity Syndrome (AIS) DNA test in Quarter Horses is essential for responsible breeding and horse health management. AIS is a genetic condition affecting male horses, causing infertility despite normal XY chromosomes. By using the AIS DNA test, breeders can identify carriers and avoid mating two carriers, preventing affected foals. This test ensures the integrity of Quarter Horse bloodlines and promotes healthier, more fertile offspring. Early detection through AIS testing helps maintain the breed’s performance and value. Trust reputable labs for accurate AIS DNA testing in Quarter Horses. Stay informed and protect your horses with reliable genetic screening today.

Abbreviation : AIS-QH

Analysed mutation : AR c.1A/G

Inheritance : X-Linked Recessive

Acronym

AIS-QH

Observed frequency

Normal

Clinical severity

Moderate

Clinical classification

Endocrine Diseases

Analysed mutation

AR c.1A/G

Mode of inheritance

X-Linked Recessive (Complete)

Test summary:

Androgen Insensitivity Syndrome (AIS) in Quarter Horses is a genetic condition where affected horses are genetically male (XY) but develop female physical traits due to their bodies' inability to respond to male hormones. DNA testing for AIS helps breeders identify carriers and affected horses to prevent breeding that could produce infertile offspring. This test is crucial for maintaining healthy bloodlines and avoiding unexpected reproductive issues. Early detection through DNA analysis supports better management and care of Quarter Horses. Overall, AIS testing promotes responsible breeding practices in the equine industry.

Available from the pack : Basic

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Understanding Androgen Insensitivity Syndrome (AIS) in Quarter Horses

Androgen Insensitivity Syndrome (AIS) is a genetic condition that affects the development of sexual characteristics in horses, particularly in male individuals. This condition arises due to a mutation in the androgen receptor gene, which plays a crucial role in how an organism responds to male hormones, known as androgens. In horses with AIS, the body is unable to respond to these hormones, leading to a range of physical and physiological effects.

Clinical Manifestations of AIS

Horses affected by AIS typically exhibit a phenotype that is inconsistent with their genetic sex. For instance, genetically male horses may present with female characteristics, including external genitalia that resemble that of a mare. Internally, these horses may have undescended testes or may develop female reproductive structures. As a result, affected individuals can often be misidentified during early assessments.

Impact on Reproduction

The reproductive capacity of horses with AIS is significantly compromised. Because the condition interferes with the normal development of male reproductive organs, affected horses are usually sterile. This sterility can pose challenges for breeders and owners, particularly in a breed like the Quarter Horse, where breeding success is often a key consideration for performance and economic viability.

Diagnosis of AIS

Diagnosing AIS typically involves a combination of clinical examination and genetic testing. Observations of external genitalia and overall physical development can prompt further investigation. Genetic testing can confirm the presence of the mutation in the androgen receptor gene, solidifying the diagnosis. Early identification of AIS is crucial for managing the condition effectively and making informed decisions regarding breeding and training.

Management and Care of Horses with AIS

Caring for horses diagnosed with AIS requires a tailored approach. Due to their unique physical attributes and reproductive challenges, these horses may benefit from specialized training and management strategies. Owners should also be educated about the condition to ensure they can provide appropriate care and support. Although affected horses may not contribute to breeding programs, they can still excel in various equestrian activities, given the right training and support.

Conclusion

Androgen Insensitivity Syndrome presents unique challenges within the Quarter Horse breed, affecting both the physical characteristics and reproductive capabilities of affected individuals. Understanding this condition through genetic testing and clinical observation is essential for responsible management and care. With proper knowledge and resources, owners of horses with AIS can ensure that these animals lead fulfilling lives, despite the challenges presented by their condition.

Breed recognized for the test : Androgen Insensitivity Syndrome In Quarter Horse (AIS-QH)

Quarter Horse

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 AIS-QH

Genotype

Status

🟡 N/N

Non-carrier - No Risk

❌ ♂ N/AIS-QH

Affected - At Risk

🟡 ♀ N/AIS-QH

Carrier - No Risk

❌ AIS-QH/AIS-QH

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/AIS-QH (Carrier)

AIS-QH/AIS-QH (Affected)

DNA Test FAQ

What does this DNA test detect?

This DNA test detects the mutation associated with Androgen Insensitivity Syndrome In Quarter Horse (AIS-QH) 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 X-Linked Recessive.

Which mutation is analysed in this test?

This test analyses the mutation AR c.1A/G.

Is a carrier animal necessarily affected?

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

References

Révay T, Villagómez D A F, Brewer D, Chenier T, King W A. GTG mutation in the start codon of the androgen receptor gene in a family of horses with 64,XY disorder of sex development. Sex Dev. 2012;6(1-3):108-16. doi: 10.1159/000334049. Epub 2011 Nov 15.

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