title: FADS gene cluster modulates the effect of breastfeeding on asthma. Results from the GINIplus and LISAplus studies.
abstract: BACKGROUND
  The protective effect of breastfeeding (BF) on the development of asthma has been widely recognized, even if not all results have been consistent. Gene variants of the FADS gene cluster have a major impact on fatty acid composition in blood and in breast milk. Therefore, we evaluated the influence of the FADS1 FADS2 gene cluster polymorphisms on the association between BF and asthma.
  
  
  METHODS
  The analysis was based on data (N=2245) from two German prospective birth cohort studies. Information on asthma and BF during the first 6 months was collected using questionnaires completed by the parents. Logistic regression modelling was used to analyse the association between exclusive BF and ever having asthma stratified by genotype.
  
  
  RESULTS
  In the stratified analyses, BF for 3 or 4 months after birth had a protective effect for heterozygous and homozygous carriers of the minor allele (adjusted odds ratio between 0.37 (95% CI: 0.18-0.80) and 0.42 (95% CI: 0.20-0.88). Interaction terms of BF with genotype were significant and ranged from -1.17 (P-value: 0.015) to -1.33 (0.0066). Moreover, heterozygous and homozygous carriers of the minor allele who were exclusively breastfed for 5 or 6 months after birth had a reduced risk of asthma [0.32 (0.18-0.57) to 0.47 (0.27-0.81)] in the stratified analyses. For individuals carrying the homozygous major allele, BF showed no significant effect on the development of asthma.
  
  
  CONCLUSIONS
  The association between exclusive BF and asthma is modified by the genetic variants of FADS genotypes in children.
authors.affiliation: Helmholtz Zentrum München, German Research Centre for Environmental Health, Institute of Epidemiology I, Ingolstädter Landstrasse 1, Neuherberg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Standl
authors.forename: S
authors.initials: S
authors.lastname: Sausenthaler
authors.forename: E
authors.initials: E
authors.lastname: Lattka
authors.forename: S
authors.initials: S
authors.lastname: Koletzko
authors.forename: C-P
authors.initials: CP
authors.lastname: Bauer
authors.forename: H-E
authors.initials: HE
authors.lastname: Wichmann
authors.forename: A
authors.initials: A
authors.lastname: von Berg
authors.forename: D
authors.initials: D
authors.lastname: Berdel
authors.forename: U
authors.initials: U
authors.lastname: Krämer
authors.forename: B
authors.initials: B
authors.lastname: Schaaf
authors.forename: I
authors.initials: I
authors.lastname: Lehmann
authors.forename: O
authors.initials: O
authors.lastname: Herbarth
authors.forename: N
authors.initials: N
authors.lastname: Klopp
authors.forename: B
authors.initials: B
authors.lastname: Koletzko
authors.forename: J
authors.initials: J
authors.lastname: Heinrich
mesh_terms: D001249:Asthma / Q000453:epidemiology / Q000235:genetics*; D001942:Breast Feeding; D002648:Child; D002675:Child, Preschool; D000090943:Delta-5 Fatty Acid Desaturase; D044943:Fatty Acid Desaturases / Q000235:genetics*; D005260:Female; D005838:Genotype; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D005810:Multigene Family; D020641:Polymorphism, Single Nucleotide; D015995:Prevalence; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D000090943:Delta-5 Fatty Acid Desaturase; D044943:Fatty Acid Desaturases; C000716847:FADS1 protein, human