Farming in childhood, diet in adulthood and asthma history.

The decrease in the number of children living on traditional farms in France during early childhood and changes in diet could both play a role in the increase in asthma prevalence over the last decades. This study aimed to assess 1) the association of farming lifestyle in childhood and asthma, and 2) whether diet in adulthood modifies the association between farming lifestyle in childhood and adult-onset asthma. In the French Etude Epidemiologique des Femmes de la Mutuelle Générale de l'Education Nationale (E3N) study (54,018 females; age 43-68 yrs), three indicators of farming lifestyle were defined: one using individual data (having farmer parents) and two using ecological data (born in a rural area and exposure to cattle).

Phenotypic determinants of uncontrolled asthma.

Background: Although uncontrolled asthma remains frequent, determinants of asthma control are poorly studied.

Objectives: The aim was to estimate the distribution and the phenotypic characteristics of asthma control in 2 groups of subjects defined by the use of inhaled corticosteroids (ICS) in the past 12 months, in the Epidemiological study on the Genetics and Environment of Asthma, bronchial hyperresponsiveness and atopy (EGEA).

Methods: Five hundred one adult current patients with asthma who participated in the follow-up of the EGEA study were included.

Cat sensitization according to cat window of exposure in adult asthmatics.

Background: In adults, there is limited information on tolerance to cat, which may be reflected by high IgG4 without IgE sensitization. Early exposure to cat may play a critical role.

Objective: The aim was to assess among adults the association of Fel d 1 IgG4, Fel d 1 IgE, skin prick test (SPT) response to cat and pet-related symptoms in relation to exposure to cat considering the period of exposure.

Heterogeneity of asthma according to blood inflammatory patterns.

Rationale: There is increasing interest regarding asthma heterogeneity in relation to inflammatory patterns.

Objectives: To assess phenotypic characteristics, in particular clinical presentation of the disease, in 381 well-characterised adults with asthma from the French Epidemiological study on the Genetics and Environment of Asthma (EGEA) according to their blood inflammatory pattern.

Methods: Four blood inflammatory patterns were defined according to eosinophil (EOS) and neutrophil (NEU) count cut-off points.

CD14 and toll-like receptor gene polymorphisms, country living, and asthma in adults.

Rationale: It has been shown that country living protects against asthma, which may be explained by microbial exposures.

Objectives: To study whether single nucleotide polymorphisms (SNPs) in CD14 and Toll-like receptor (TLR) 2, TLR4 and TLR9 genes are associated with asthma in adults, and whether these SNPs modify associations between country living and asthma.

Methods: Twenty-five SNPs in CD14, TLR2, TLR4, and TLR9 genes were genotyped in adult subjects from the French Epidemiological study on the Genetics and Environment of Asthma, Bronchial Hyperresponsiveness, and Atopy (EGEA).