title: Paternal history of asthma and airway responsiveness in children with asthma.
abstract: BACKGROUND
  Little is known regarding the relationship between parental history of asthma and subsequent airway hyperresponsiveness (AHR) in children with asthma.
  
  
  OBJECTIVE
  We evaluated this relationship in 1,041 children with asthma participating in a randomized trial of antiinflammatory medications (the Childhood Asthma Management Program [CAMP]).
  
  
  METHODS
  Methacholine challenge testing was performed before treatment randomization and once per year over an average of 4.5 years postrandomization. Cross-sectional and longitudinal repeated measures analyses were performed to model the relationship between PC20 (the methacholine concentration causing a 20% fall in FEV1) with maternal, paternal, and joint parental histories of asthma. Models were adjusted for potential confounders.
  
  
  RESULTS
  At baseline, AHR was strongly associated with a paternal history of asthma. Children with a paternal history of asthma demonstrated significantly greater AHR than those without such history (median log(e)PC20, 0.84 vs. 1.13; p = 0.006). Although maternal history of asthma was not associated with AHR, children with two parents with asthma had greater AHR than those with no parents with asthma (median log(e)PC20, 0.52 vs. 1.17; p = 0.0008). Longitudinal multivariate analysis of the relation between paternal history of asthma and AHR using repeated PC20 measurements over 44 months postrandomization confirmed a significant association between paternal history of asthma and AHR among children in CAMP.
  
  
  CONCLUSIONS
  Our findings suggest that the genetic contribution of the father is associated with AHR, an important determinant of disease severity among children with asthma.
authors.affiliation: Channing Laboratory, Department of Medicine, and Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA. benjamin.raby@channing.harvard.edu
authors.forename: Benjamin A
authors.initials: BA
authors.lastname: Raby
authors.forename: Kristel
authors.initials: K
authors.lastname: Van Steen
authors.forename: Juan C
authors.initials: JC
authors.lastname: Celedón
authors.forename: Augusto A
authors.initials: AA
authors.lastname: Litonjua
authors.forename: Christoph
authors.initials: C
authors.lastname: Lange
authors.forename: Scott T
authors.initials: ST
authors.lastname: Weiss
mesh_terms: D000293:Adolescent; D000328:Adult; D001249:Asthma / Q000150:complications / Q000235:genetics*; D016535:Bronchial Hyperreactivity / Q000209:etiology / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D005220:Fathers; D005260:Female; D006801:Humans; D008297:Male; D008487:Medical History Taking; D012720:Severity of Illness Index