Familial Shar-Pei Fever in Dogs (Shar-Pei Autoinflammatory Disease, SPAID)
- Occurrence: very rare
- Location of disease: General/Whole body
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Shar-Pei Autoinflammatory Disease (SPAID), also known as Familial Shar-Pei Fever, is a genetic condition that occurs in Shar-Pei dogs. It is characterized by recurring Fever spikes and Inflammatory conditions that can affect various organ systems.
Das Wichtigste auf einen Blick
Shar-Pei Autoinflammatory Disease (SPAID) is a genetic condition that occurs in Shar-Pei dogs and is characterized by a dysregulation of the immune system. This leads to spontaneous Inflammatory conditions without detectable infection. A Mutation in the hyaluronic acid synthase 2 gene (HAS2) is associated with SPAID and leads to an excessive hyaluronic acid production, which contributes to both the characteristic wrinkled skin and Inflammatory conditions. The disease is hereditary and exhibits an autosomal dominant or incompletely dominant mode of inheritance. Symptoms include Fever, anorexia, joint Swelling, and Respiratory distress. Diagnosis is made through clinical assessment, genetic tests, and the exclusion of other diseases. Therapies focus on controlling Symptoms with anti-inflammatory medications and immunomodulatory therapies. Renal involvement requires special care. Prevention through genetic tests in breeding can help minimize its spread. Research aims to understand the molecular mechanisms and develop better diagnostic and therapeutic approaches. Environmental factors and nutrition are also being investigated to clarify their role in disease management. The long-term Prognosis varies depending on the severity of Symptoms and response to therapy.
Ursachen
The scientific basis of SPAID lies in a dysregulation of the immune system, which leads to an excessive inflammatory response in the body. This condition belongs to the group of autoinflammatory diseases, which are characterized by spontaneous Inflammatory conditions without detectable infection or autoimmunity.
Genetic studies have shown that SPAID is associated with a Mutation in the hyaluronic acid synthase 2 gene (HAS2). This Mutation leads to an overproduction of hyaluronic acid, which causes the characteristic wrinkled skin in Shar-Pei dogs and can simultaneously contribute to the development of Inflammatory conditions.
The exact mechanism by which this genetic mutation leads to the clinical symptoms of SPAID is not yet fully understood. However, research suggests that excessive hyaluronic acid production can put the immune system into a state of chronic activation, which explains the recurring fever spikes and inflammatory symptoms.
The genetic basis of SPAID means that the disease has a hereditary component. It is known that affected dogs can inherit the Mutation from one or both parents, indicating an autosomal dominant or incompletely dominant mode of inheritance. This genetic Predisposition makes it difficult to eliminate the disease through simple breeding practices.
Symptoms
The symptoms of SPAID are diverse and can vary in severity. A characteristic feature of the disease are recurrent fever spikes, which often occur for no apparent reason and can last for several hours to days. These fever spikes are usually associated with restlessness, reduced appetite, and general malaise.
In addition to Fever, affected dogs may exhibit Swelling in the hock or muzzle area, referred to as “muzzle edema.” These Swelling are Painful and can impair the dog’s mobility. In severe cases, Lameness may occur.
Chronic inflammatory conditions can also affect other organ systems. These include kidney damage, which can lead to chronic kidney disease. This kidney damage is often a consequence of the persistent inflammatory response and can lead to renal failure over time.
Other possible Symptoms include Skin changes, recurring gastrointestinal problems such as Vomiting and Diarrhea, and in some cases, Respiratory distress. The range and combination of Symptoms can vary from dog to dog, which can complicate Diagnosis.
Diagnose
The diagnosis of SPAID is based on a combination of clinical symptoms, genetic tests, and exclusion of other diseases. An important step in diagnosis is careful documentation of the dog’s medical history to determine whether recurring fever spikes and other typical symptoms are present.
Genetic tests can help identify the Mutation in the HAS2 gene that is associated with SPAID. These tests are particularly useful for confirming a hereditary component and securing the Diagnosis. However, it is important to note that not all dogs with the genetic Mutation develop clinical Symptoms, which complicates the interpretation of test results.
Additional diagnostic procedures may include blood test to measure inflammatory marker and monitor renal function. In some cases, imaging techniques such as ultrasound or X-rays may be required to assess organ damage and rule out possible other causes.
The Diagnosis of SPAID often requires interdisciplinary collaboration between veterinarians, geneticists, and, if necessary, immunologists, to enable a comprehensive assessment and plan the best possible therapy.
Therapie
The therapy of SPAID focuses primarily on controlling Symptoms and reducing Inflammatory conditions. Since it is a genetic disease, there is currently no cure; however, early and appropriate therapeutic intervention can help improve the affected dog’s quality of life.
The use of anti-inflammatory medications such as NSAID (non-steroidal anti-inflammatory drug) or corticosteroids can help control acute Inflammatory conditions and Fever spikes. In some cases, immunomodulatory medications may be required to regulate the immune system and reduce the frequency of flare-ups.
For dogs with kidney involvement, careful monitoring and therapy of renal function are crucial. This may include dietary changes, fluid therapy, and specific medications to support renal function.
In addition to medication therapy, supportive care, including a balanced diet, stress reduction, and regular veterinary monitoring, can help promote health stability and detect potential complications early.
Prognose und Nachsorge
The prognosis for dogs with SPAID varies depending on the severity of the disease and response to treatment. With early diagnosis and appropriate treatment, many dogs can lead a relatively normal life, although they may require regular medication and lifelong monitoring.
Dogs with kidney damage tend to have a poorer Prognosis, especially if the kidney damage progresses. Timely therapy and regular monitoring of renal function are crucial to slow the progression of the disease and maintain quality of life.
Severe cases of SPAID that do not respond well to treatment or are associated with significant complications may have a limited life expectancy. In such cases, close collaboration with the veterinarian is important to determine the best possible care and therapy options.
Prävention
Since SPAID is a genetic condition, Prevention is primarily aimed at breeding practices. Breeders should use genetic tests to identify dogs with the Mutation in the HAS2 gene and avoid breeding two carrier dogs together. This can help reduce the risk of producing affected offspring.
Educating breeders and dog owners about the disease, its Symptoms, and the importance of genetic tests is crucial to minimize the spread of the disease. Responsible breeding practices and careful selection of breeding animals are essential steps to reduce the Incidence of SPAID.
For already affected dogs, the Prevention of flare-ups and complications can be achieved through consistent medical monitoring and adapted care. This includes regular veterinary examinations, an adapted diet, and avoiding stress situations that could trigger Inflammatory conditions.
Ausblick auf aktuelle Forschung
Research into Shar-Pei Autoinflammatory Disease (SPAID), also known as Familial Shar-Pei Fever, is a rapidly developing field focusing on the genetic and immunological aspects of this condition. The disease is a hereditary autoinflammatory disease that typically occurs in Shar-Pei dogs and is characterized by recurring Fever and Swelling of the joints or muzzle. Scientists have discovered that a genetic Mutation associated with the so-called “Fever gene” (hyaluronan synthase 2, HAS2) is linked to the development of the disease.
A key focus of current research is understanding the role of hyaluronic acid, a major component of connective tissue, whose production is regulated by HAS2. An overproduction of this substance could lead to the inflammatory processes observed in SPAID. Researchers are working to decipher the exact molecular mechanisms that lead to the clinical Symptoms. It is being investigated how this excess hyaluronic acid leads to a dysregulation of the immune system, ultimately resulting in recurring Fever spikes and Inflammatory conditions.
Another research approach is to identify genetic marker that could enable early Diagnosis of the disease. By analyzing the genetic Predisposition in Shar-Pei dogs, researchers hope to develop breeding control strategies to reduce the spread of the disease in the Population. In the long term, this could also lead to targeted therapy approaches that address the genetic causes of the disease.
In addition, research is being conducted into how environmental factors and nutrition can influence the severity and frequency of flare-ups. Some studies suggest that certain feed additives or diets could alleviate the symptoms by having anti-inflammatory effects. However, research has not yet progressed far enough to make general recommendations.
In therapeutic research, the use of medications that can modulate the immune response to alleviate Inflammatory conditions is being investigated. This includes both conventional medications such as NSAID (non-steroidal anti-inflammatory drug) and novel biological therapies. The challenge is to develop treatments that effectively control Symptoms without excessively suppressing the immune system, which could increase the infection risk.
In summary, research into SPAID is in a dynamic stage, with both genetic and therapeutic advances being made. The hope is that these findings will benefit not only Shar-Pei dogs but also other dog breeds and possibly even humans with similar autoinflammatory diseases.
Frequently Asked Questions (FAQs)
1. What is SPAID?
2. What Symptoms are typical for SPAID?
3. How is SPAID diagnosed?
4. Is there a cure for SPAID?
5. Can all Shar-Pei dogs develop SPAID?
6. How can I help my dog with SPAID?
7. Is SPAID a life-threatening condition?
8. Are there preventive measures against SPAID?
9. What role does nutrition play in controlling SPAID?
10. Can SPAID also occur in other dog breeds?
Literatur
- Olsson, M., Meadows, J. R. S., Truvé, K., Rosengren Pielberg, G., Puppo, F., Mauceli, E., Quilez, J., Tonomura, N., Zanna, G., Docampo, M. J., Bassols, A., Avery, A. C., Karlsson, E. K., Thomas, A., Kastner, D. L., Bongcam-Rudloff, E., Webster, M. T., Sanchez, A., Hedhammar, Å., Remmers, E. F., Andersson, L., Ferrer, L., Tintle, L., & Lindblad-Toh, K. (2011). A novel unstable duplication upstream of HAS2 predisposes to a breed-defining skin phenotype and a periodic fever syndrome in Chinese Shar-Pei dogs. PLOS Genetics, 7(3), e1001332. https://doi.org/10.1371/journal.pgen.1001332
- Olsson, M., Kierczak, M., Karlsson, Å., Jabłońska, J., Leegwater, P., Koltookian, M., Abadie, J., de Citres, C. D., Thomas, A., Hedhammar, Å., Tintle, L., Lindblad-Toh, K., & Meadows, J. R. S. (2016). Absolute quantification reveals the stable transmission of a high copy number variant linked to autoinflammatory disease. BMC Genomics, 17, Article 299. https://doi.org/10.1186/s12864-016-2619-0
- Metzger, J., Distl, O., & others. (2017). Whole genome sequencing identifies missense mutation in MTBP in Shar-Pei affected with autoinflammatory disease (SPAID). BMC Genomics, 18, Article 348. https://doi.org/10.1186/s12864-017-3737-5
- Olsson, M., et al. (2013). Thorough investigation of a canine autoinflammatory disease (AID) confirms one main risk locus and suggests a modifier locus for amyloidosis. PLOS ONE, 8(10), e75242. https://doi.org/10.1371/journal.pone.0075242
- Work, M., Scudder, C., Bergum Hjellegjerde, K., Dunning, M., Gajanayake, I., Kent, A., Tintle, L., Sparks, T., & Allerton, F. (2023). A survey on Shar Pei autoinflammatory disease in the United Kingdom. Journal of Small Animal Practice, 64(6), 401–408. https://doi.org/10.1111/jsap.13602
- Trigo, L. A., & others. (2024). Shar-Pei autoinflammatory disease with skin necrosis due to cutaneous vasculopathy. Veterinary Dermatology, 35(6), 635–640. https://doi.org/10.1111/vde.13278