Winchester syndrome is a rare congenitalconnective 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, and osteoporosis. Winchester syndrome was once considered to be related to a similar condition, multicentric osteolysis, nodulosis, and arthropathy. However, it was discovered that the two are caused by mutations found in different genes; they are now thought of as two separate disorders. 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
Symptoms of Winchester syndrome begin with the deterioration of bone within the hands and feet. This loss of bone causes pain 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 and swollen joints. Many people develop osteopenia and osteoporosis throughout their entire body. Due to the damage to the bones, many affected individuals suffer from short stature and bone fractures. 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 . The eyes may develop a white or clear covering the cornea which can cause problems with vision.
Mechanism
Winchester syndrome is believed to be inherited through autosomal recessive inheritance. For recessive genetic disorders, individuals inherit the mutated gene for the same trait from both parents. 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. 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, diagnostic criteria was 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. 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. 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 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. 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 and Winchester syndrome are different diseases. Mutations in MMPS and MT1-MMP result in similar but distinctly different "vanishing bone" syndromes.
