The Clinical Features of Hereditary Alpha-Tryptasemia—Implications for Interdisciplinary Practice

Area of Science:

• Genetics
• Immunology
• Gastroenterology

Background:

• Hereditary alpha-tryptasemia (HAT) is an autosomal dominant genetic condition.
• It leads to elevated basal serum tryptase (BST) levels (≥ 8-11.4 μg/L).
• Prevalence in the UK and France is 5-6%; unknown in Germany.

Purpose of the Study:

• To review the clinical manifestations and diagnostic considerations of HAT.
• To highlight HAT as an important differential diagnosis in interdisciplinary practice.

Main Methods:

• Literature review using PubMed.
• Analysis of scientific meeting presentations.
• Inclusion of clinical experience and collected data on prevalence and manifestations.

Main Results:

• HAT is common in patients with BST ≥ 8 μg/L (64-74%).
• Associated symptoms include neuropsychiatric (exhaustion, depression, sleep/memory issues), gastrointestinal (irritable bowel, nausea, reflux), and mast cell-mediated (flushing, itch, urticaria, anaphylaxis).
• HAT is more prevalent in systemic mastocytosis (12-21%) and linked to severe anaphylaxis.

Conclusions:

• HAT diagnosis is suspected via history and BST measurement.
• Molecular genetic testing confirms the diagnosis.
• Therapeutic options include antihistamines, mast cell stabilizers, and IgE antibodies.