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Highly variable clinical phenotypes of hypomorphic RAG1 mutations.

Elizabeth Mannino Avila¹, Gulbu Uzel, Amy Hsu

¹Duke University School of Medicine, Durham, North Carolina, USA.

|October 20, 2010

Summary

Hypomorphic mutations in recombination-activating genes (RAG) 1 cause varied immune disorders. These RAG1 mutations present uniquely, impacting immune function and autoimmunity across patients.

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Area of Science:

Immunology
Genetics

Background:

Hypomorphic mutations in recombination-activating genes (RAGs) 1 and 2 lead to a spectrum of immune dysregulation, including severe combined immunodeficiency (SCID) and Omenn syndrome.
These mutations result in partial protein function, contributing to diverse clinical presentations.

Observation:

We describe three patients with hypomorphic RAG1 mutations exhibiting distinct clinical phenotypes.
Patient 1 presented with granulomatous skin disease and disseminated nontuberculous mycobacteria.
Patient 2 showed predominantly autoimmune manifestations, while Patient 3 had late-onset infections and isolated T-cell lymphopenia.

Findings:

These cases demonstrate that hypomorphic RAG1 mutations can manifest atypically.
The varied presentations underscore the critical role of RAG1 in maintaining immune homeostasis and preventing autoimmunity.

Implications:

The findings expand the known disease spectrum associated with RAG1 mutations.
Understanding these diverse presentations is crucial for accurate diagnosis and management of immunodeficiency disorders.