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[A20 haploinsufficiency: what do clinicians need to know?]
I Elhani1, A Aouba2, Q Riller3
1Centre de référence des maladies auto-inflammatoires rares et des amyloses, service de pédiatrie générale, hôpital de Versailles, Versailles, France; Sorbonne université, centre de recherche Saint-Antoine (CRSA) INSERM UMRS-938.
La Revue De Medecine Interne
|December 30, 2023
Summary
A20 Haploinsufficiency (HA20) is a rare autoinflammatory disease caused by TNFAIP3 gene mutations, leading to NF-κB pathway defects. Its broad clinical spectrum presents significant diagnostic challenges for physicians.
Area of Science:
- Genetics and immunology
- Monogenic autoinflammatory diseases
Context:
- A20 Haploinsufficiency (HA20) is a rare disorder linked to TNFAIP3 gene mutations.
- It disrupts the NF-κB pathway, crucial for immune regulation.
- Fewer than 200 cases are documented globally.
Purpose:
- To review the diagnostic challenges of A20 Haploinsufficiency.
- To highlight the broad clinical manifestations and mimicry of other autoimmune diseases.
- To emphasize the need for molecular diagnosis.
Summary:
- HA20 presents with recurrent fevers, aphthosis, and folliculitis, but also involves gastrointestinal, articular, and cutaneous systems.
- It is frequently misdiagnosed as Behçet's disease, Crohn's disease, or lupus.
- Diagnosis relies on identifying TNFAIP3 mutations, often in adulthood despite early-onset symptoms.
Impact:
- Enhances understanding of a rare autoinflammatory condition.
- Aids clinicians in recognizing HA20 and avoiding misdiagnosis.
- Underscores the importance of genetic testing for complex inflammatory disorders.
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