The Limited Scleroderma Marker
Anti-centromere antibodies target the centromere region of chromosomes and are highly specific for limited cutaneous systemic sclerosis (also called CREST syndrome: Calcinosis, Raynaud, Esophageal dysmotility, Sclerodactyly, Telangiectasia). If you have anti-centromere antibodies with Raynaud phenomenon, scleroderma is the likely diagnosis.
What is Anti-Centromere Antibody (ACA)?
Anti-centromere antibodies target centromere proteins (CENP-A, B, C). Produce a distinctive centromere (discrete speckled) pattern on ANA immunofluorescence. >90% specific for limited systemic sclerosis. Present in 50-90% of limited SSc and 10-15% of PBC patients.
↑ What High Anti-Centromere Antibody (ACA) Means
Positive: strong association with limited systemic sclerosis (CREST). Also associated with primary biliary cholangitis (PBC). Better prognosis than anti-Scl-70 positive diffuse scleroderma.
Common symptoms:
Raynaud phenomenon (fingers turn white → blue → red with cold) · Sclerodactyly (tight, shiny skin on fingers) · Telangiectasias (spider veins on face/hands) · Dysphagia (esophageal dysmotility) · Calcinosis (calcium deposits under skin)
↓ What Low Anti-Centromere Antibody (ACA) Means
Negative: doesn't exclude scleroderma (check anti-Scl-70 for diffuse type).
Common symptoms:
Negative = no symptoms from this marker
Why It Matters
When normal:
Highly specific for limited systemic sclerosis (CREST)
Distinguishes limited from diffuse scleroderma
Predicts better prognosis than diffuse SSc
Also associated with primary biliary cholangitis
Risks if abnormal:
Limited SSc: pulmonary arterial hypertension (main cause of death)
CREST: Raynaud can cause digital ulcers
Monitor for PAH with annual echocardiogram
What Can Cause Abnormal Levels?
Limited Systemic Sclerosis (CREST)
70% likelyLimited skin involvement (distal to elbows/knees + face). Higher PAH risk. Better overall survival than diffuse.
Primary Biliary Cholangitis
15% likely10-15% of PBC patients are anti-centromere positive.
Raynaud Phenomenon (isolated)
Anti-centromere positive Raynaud has high progression risk to scleroderma.
What You Can Do
If positive with Raynaud: full scleroderma workup (nailfold capillaroscopy, PFTs, echo)
Impact: Early detection of organ involvement \u00B7 Timeline: At diagnosis
Annual echocardiogram for pulmonary arterial hypertension screening
Impact: PAH is the leading cause of death in limited SSc \u00B7 Timeline: Annual
If lifestyle changes aren't enough:
Raynaud management: calcium channel blockers (nifedipine), keep warm
Impact: Prevents digital ischemia and ulcers \u00B7 Timeline: Ongoing
Recommended retest: One-time diagnostic; does not need serial monitoring
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