Match each rheumatologic autoantibody profile with its most characteristic clinical presentation.
- Anti-Jo-1 antibodyProximal muscle weakness, hyperkeratotic fissures on the lateral aspect of the fingers, and interstitial lung disease
- Anti-centromere antibodyCutaneous thickening restricted to the distal extremities, long-standing Raynaud phenomenon, and esophageal dysmotility
- Anti-U1-ribonucleoprotein (RNP) antibodyInflammatory polyarthritis, puffy fingers, and overlapping clinical features of lupus, systemic sclerosis, and myositis
- Anti-topoisomerase I (anti-Scl-70) antibodyExtensive cutaneous thickening involving the trunk and proximal extremities, associated with high risk for pulmonary fibrosis
Answer
Anti-Jo-1 matches with proximal muscle weakness and mechanic's hands. Anti-centromere matches with distal cutaneous thickening and esophageal dysmotility. Anti-U1-RNP matches with polyarthritis and overlapping lupus/sclerosis features. Anti-topoisomerase I matches with extensive trunk/proximal cutaneous thickening and pulmonary fibrosis.
Each rheumatologic condition has a highly specific autoantibody profile. Antisynthetase syndrome classically presents with anti-Jo-1 positivity, interstitial lung disease, and mechanic's hands. Mixed connective tissue disease requires the presence of anti-U1-RNP and features a combination of lupus, myositis, and systemic sclerosis signs. The subtypes of systemic sclerosis are differentiated clinically by the extent of skin involvement (limited vs. diffuse) and serologically by their respective markers (anti-centromere vs. anti-topoisomerase I).
Step-by-Step Solution
Key Concept
Clinical correlation of specific autoantibodies in systemic autoimmune and connective tissue diseases
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