Expanding IPEX: Inborn Errors of Regulatory T Cells

Area of Science:

• Immunology
• Genetics
• Clinical Medicine

Background:

• Regulatory T cells (Tregs) are essential for maintaining peripheral tolerance and preventing autoimmune diseases.
• Monogenic disorders affecting Tregs, termed Tregopathies, often manifest with polyautoimmunity, atopic conditions, and recurrent infections.
• While some Tregopathies present in early childhood, later-onset cases are increasingly recognized as the spectrum of these diseases expands.

Purpose of the Study:

• To review the clinical and genetic characteristics of monogenic Tregopathies.
• To highlight the diagnostic challenges and therapeutic strategies for patients with Treg deficiencies.
• To discuss the current and future treatment landscape for these rare immune disorders.

Main Methods:

• Literature review of studies on monogenic Tregopathies.
• Analysis of clinical presentations, genetic mutations, and treatment outcomes.
• Synthesis of information regarding diagnostic criteria and therapeutic interventions.

Main Results:

• Tregopathies present with diverse autoimmune and atopic manifestations, with varying ages of onset.
• Reduced Treg numbers are not consistently observed, underscoring the need for genetic testing in suspected cases.
• Hematopoietic cell transplantation is the only established curative option, though novel gene therapies are under development.

Conclusions:

• Early and accurate diagnosis of Tregopathies through genetic testing is critical for appropriate management.
• While hematopoietic cell transplantation offers a cure, ongoing research into gene therapy and targeted small molecule inhibitors promises improved treatment options.
• Understanding Treg biology and dysfunction is key to developing effective therapies for these complex immune dysregulatory disorders.