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High intrafamilial variability in autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy: a case study.

D Capalbo¹, A Fusco, G Aloj

¹Department of Pediatrics, Federico II University, Naples, Italy.

Journal of Endocrinological Investigation

|November 11, 2011

Summary

This summary is machine-generated.

Autoimmune polyendocrinopathy-candidiasis-ectodermal-dystrophy syndrome (APECED) shows significant phenotype variability despite identical genotypes. This heterogeneity is not explained by infectious triggers or altered peripheral tolerance mechanisms.

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Area of Science:

Immunology
Genetics
Endocrinology

Background:

Autoimmune polyendocrinopathy-candidiasis-ectodermal-dystrophy syndrome (APECED) is a monogenic disorder.
Phenotypic heterogeneity in APECED is well-documented but poorly understood.
The genetic basis of APECED involves mutations in the AIRE gene.

Observation:

Two APECED siblings with identical genotypes exhibited markedly different clinical phenotypes.
Evaluations included infectious triggers, autoantibody profiles, peripheral tolerance mechanisms, and HLA haplotypes.
Key assessments involved resistance to Fas-induced apoptosis, regulatory T cell counts, and natural killer cell activity.

Findings:

No significant differences were found between siblings in common infectious triggers.
Mechanisms of peripheral tolerance, including Fas-induced apoptosis and regulatory T cell numbers, were comparable.
Human leukocyte antigen (HLA) haplotypes and natural killer (NK) cell activity also showed no divergence.

Implications:

The extreme phenotypic variability in APECED cannot be attributed to common infectious agents.
Functional alterations in peripheral tolerance mechanisms do not explain the observed differences in disease expressivity.
Further research is needed to elucidate the factors contributing to APECED phenotype heterogeneity.