Dominant inheritance of atopic immunoglobulin-E responsiveness

Area of Science:

• Immunology
• Genetics
• Allergy Research

Background:

• Atopy is characterized by elevated serum immunoglobulin-E (IgE) levels and positive skin prick test responses to common allergens.
• Understanding the familial occurrence of atopy is crucial for identifying genetic predispositions and environmental interactions.
• Previous studies suggest a hereditary component to atopic diseases, but the precise mode of inheritance requires further investigation.

Purpose of the Study:

• To investigate the familial aggregation of atopy within nuclear and extended family structures.
• To determine the pattern of inheritance for the tendency to produce IgE in response to common inhaled allergens.
• To explore the relationship between diagnosed atopy, reported symptoms, and self-perception of allergic disorders.

Main Methods:

• Conducted a study involving 239 individuals across 40 nuclear and 3 extended families.
• Assessed atopy through skin prick tests and measurement of serum IgE levels against common inhaled allergens.
• Collected family history data and inquired about symptoms suggestive of atopic disease.

Main Results:

• In nuclear families, 90% of atopic children had at least one atopic parent.
• Atopy demonstrated vertical transmission in extended families, with 66% of offspring from atopic and unaffected parents being atopic.
• While 83% of identified atopic subjects reported symptoms, only 30% considered themselves to have an atopic disorder.

Conclusions:

• Atopy, the propensity to produce IgE to common allergens, is suggested to be inherited in an autosomal dominant pattern.
• Clinical manifestation of atopy likely involves interactions with other genetic and environmental factors beyond the primary inherited tendency.
• The discrepancy between objective atopy markers and self-reported disease highlights the complexity of atopic disease expression.