Nodulosis–arthropathy–osteolysis Syndrome

Winchester syndrome is a rare hereditary connective tissue disease described in 1969, of which the main characteristics are short stature, marked contractures of joints, opacities in the cornea, coarse facial features, dissolution of the carpal and tarsal bones (in the hands and feet, respectively), and osteoporosis. Winchester syndrome was once considered to be related to a similar condition, multicentric osteolysis, nodulosis, and arthropathy (MONA). However, it was discovered that the two are caused by mutations found in different genes; however they mostly produce the same phenotype or clinical picture. Appearances resemble rheumatoid arthritis. Increased uronic acid is demonstrated in cultured fibroblasts from the skin and to a lesser degree in both parents. Despite initial tests not showing increased mucopolysaccharide excretion, the disease was regarded as a mucopolysaccharidosis. Winchester syndrome is thought to be inherited as an autosomal recessive trait.

Symptoms and signs

Symptoms of Winchester or MONA syndrome begin with the deterioration of bone within the hands and feet. This loss of bone causes pain, pathological fractures and limited mobility. The abnormalities of the bone spread to other areas of the body, mostly the joints. This causes arthropathy: stiffening of the joints (contractures) and swollen joints. Many people develop osteopenia and osteoporosis throughout their entire body. The bone and joint manifestations characteristically start in the hands and feet then spread to the larger joints eventually like elbows and shoulders in the upper extremities and knees and hips in the lower extremities. Due to the damage to the bones, many affected individuals suffer from bone fractures, arthritis and occasionally short stature.

Many individuals experience leathery skin where the skin appears dark and thick. Excessive hair growth is known to be found in these darker areas of the skin (hypertrichosis). The eyes may develop a white or clear covering the cornea (corneal opacities) which can cause problems with vision.

Mechanism

Winchester syndrome is believed to be inherited through autosomal recessive inheritance. It believed that this disease is caused by a nonlysosomal connective-tissue disturbance. The protein inactivation mutation is found on the matrix metalloproteinase 2 gene (MMP2). MM2 is responsible for bone remodeling. Bone remodeling is the process in which old bone is destroyed so that new bone can be created to replace it. This mutation causes a multicentric osteolysis and arthritis syndrome. It is hypothesized that the loss of an upstream MMP-2 protein activator MT1-MMP, results in decreased MMP-2 activity without affecting ''MMP2''. The inactivating homoallelic mutation of ''MT1-MMP'' can be seen at the surface of fibroblasts. It was determined that fibroblasts lacking MT1-MMP lack the ability to degrade type I collagen which leads to anomalous function.

Diagnosis

In 1989, a set of diagnostic criteria were created for the diagnosing of Winchester syndrome. The typical diagnosis criteria begin with skeletal radiological test results and two of the defining symptoms, such as short stature, coarse facial features, hyperpigmentation, or excessive hair growth. The typical tests that are performed are x-ray and magnetic resonance imaging. A complete skeletal radiographic survey is mandatory for diagnosis of Winchester or MONA syndrome together with a detailed musculoskeletal examination and craniofacial morphology assessment. It appears that Winchester syndrome is more common in women than men. Winchester syndrome is very rare. There have only been a few individuals worldwide who were reported to have this disorder.

Treatment

There is no known cure for Winchester syndrome; however, there are many therapies that can aid in the treatment of symptoms. Such treatments can include medications: anti-inflammatories, muscle relaxants, and antibiotics. Many individuals will require physical therapy to promote movement and use of the limbs affected by the syndrome. Bisphosphonates have been used to improve bone quality and density or at least halt the progression of bone damages or osteolysis. Genetic counseling is typically prescribed for families to help aid in the understanding of the disease. There are a few clinical trials available to participate in. The prognosis for patients diagnosed with Winchester syndrome is positive. It has been reported that several affected individuals have lived to middle age; however, the disease is progressive and mobility will become limited towards the end of life. Eventually, the contractures will remain even with medical intervention, such as surgery.

Research

In 2005, a patient with Winchester syndrome was shown to have mutations in the matrix metalloproteinase 2 (''MMP2'') gene. A 2006 study showed other mutations found in the MMP2 gene. This has led to the belief that there are many similar diseases within this family of mutations. As of 2007, it was found that these mutations are also found in Torg and Nodulosis-arthropathy-osteolysis syndrome (NAO). This means that Torg, NAO, and Winchester syndrome are allelic disorders. In 2014, a new case of Winchester syndrome was reported. According to a recently published article, it was discovered that multicentric osteolysis, nodulosis, and arthropathy (MONA) and Winchester syndrome are different diseases. Mutations in MMPS and MT1-MMP result in similar but distinctly different "vanishing bone" syndromes.

See also

* Multicentric carpotarsal osteolysis syndrome

References

External links

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Inborn errors of metabolism
Metabolic disorders
Connective tissue diseases
Rare syndromes