Longitudinal Immune Profiling in Autoimmune Polyendocrine Syndrome Type 1.

Area of Science:

• Immunology
• Genetics
• Endocrinology

Background:

• Autoimmune Polyendocrine Syndrome Type-1 (APS-1) is a rare autoimmune disorder caused by mutations in the autoimmune regulator (AIRE) gene.
• AIRE gene mutations lead to impaired T-cell selection and altered T regulatory cell populations, but immune cell subset dynamics across the lifespan in APS-1 are poorly understood.

Purpose of the Study:

• To investigate the peripheral distribution and longitudinal changes of 13 immune cell subsets across the lifespan in patients with APS-1.
• To identify age-related variations in immune cell composition in APS-1 and compare them to healthy individuals.

Main Methods:

• Epigenetic quantification was used to analyze the peripheral distribution of 13 immune cell subsets.
• Longitudinal analysis was performed to track changes in cell composition over time in APS-1 patients and healthy controls.

Main Results:

• The most significant differences in immune cell distribution were observed in young APS-1 patients, coinciding with the onset of clinical symptoms.
• Reduced frequencies of B cells, T-cell subgroups, nonclassical monocytes, and Natural Killer cells were found in young APS-1 patients.
• B-cell frequencies declined with age in both APS-1 patients and healthy controls, while Tregs, follicular helper T cells, and natural killer cells showed opposing age-related trends.

Conclusions:

• Immune cell subset dynamics in APS-1 vary significantly across the lifespan, with notable differences emerging early in life.
• The opposing age-related trends in specific immune cell populations highlight the importance of considering age-specific cohort profiles in APS-1 research to avoid conflicting interpretations.