Camptodactyly-arthropathy-coxa vara-pericarditis syndrome
Rare autosomal recessive syndrome affecting joints and pericardium.
Camptodactyly-arthropathy-coxa vara-pericarditis syndrome is a rare autosomal recessive genetic medical condition caused by a mutation in the gene proteoglycan 4 (PRG4), also known as lubricin. This mucin-type glycoprotein acts as a lubricant for cartilage surfaces. The syndrome was first described in 1986, and its genetic cause was identified in 1999.
- First described
- 1986
- Genetic cause discovered
- 1999
- Inheritance
- autosomal recessive
- Gene
- PRG4 (proteoglycan 4, also known as lubricin)
- Chromosome location
- long arm of chromosome 1 (1q)
- Protein size
- ~345 kDa glycoprotein, 1,404 amino acids (human A isoform)
Lore & Background
The condition presents with camptodactyly, arthropathy, coxa vara, and pericarditis, and may also include congenital cataracts. Children often have a joint effusion that is cool and resistant to anti-inflammatory therapy. The arthropathy principally involves large joints such as elbows, hips, knees, and ankles. Pericarditis may be a presenting feature or occur later. Coxa vara occurs in 50–90% of cases and noninflammatory pericarditis in 30%.
Reader's Guide
Camptodactyly-arthropathy-coxa vara-pericarditis syndrome is significant as a rare genetic disorder that highlights the critical role of lubricin in joint lubrication and pericardial function. Its discovery in 1986 and the subsequent identification of the PRG4 gene mutation in 1999 provided insight into the molecular basis of joint and pericardial pathology. The condition's resistance to anti-inflammatory therapy and its characteristic cool joint effusion distinguish it from inflammatory arthropathies. Radiological features such as large acetabular cysts and periarticular osteopenia aid diagnosis. The syndrome underscores the importance of proteoglycans in connective tissue health and offers a model for studying lubricin-related therapies.
Did You Know?
- Synovial fluid in this condition is typically viscous, clear, honey-colored, and low in cell count.
- The PRG4 gene encodes a glycoprotein of ~345 kDa with multiple domains including somatomedin B homology and mucin-like repeats.
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