RT Journal Article SR Electronic T1 β2-Adrenoceptor polymorphisms and asthma phenotypes: interactions with passive smoking JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 48 OP 55 DO 10.1183/09031936.00123206 VO 30 IS 1 A1 G. Zhang A1 C. M. Hayden A1 S-K. Khoo A1 P. Candelaria A1 I. A. Laing A1 S. Turner A1 P. Franklin A1 S. Stick A1 L. Landau A1 J. Goldblatt A1 P. N. Le Souëf YR 2007 UL http://erj.ersjournals.com/content/30/1/48.abstract AB The aim of the present study was to assess the effects of possible interactions between β2-adrenoceptor gene polymorphisms and passive smoking on forced expiratory volume in one second (FEV1), forced vital capacity (FVC) and exhaled nitric oxide (eNO) in children aged 11 yrs. A cross-sectional analysis of the longitudinal cohort was conducted for associations between β2-adrenoceptor gene polymorphisms and lung function and eNO with regard to passive smoking. Among children exposed to tobacco smoke, those with Arg16 (at least one Arg allele) exhibited lower adjusted mean FEV1 (2.19 versus 2.38 L) and FVC (2.43 versus 2.64 L) than Gly16 homozygotes. Those with Gln27 (at least one Gln allele) also exhibited a lower adjusted mean FEV1 relative to Glu27 homozygotes (2.24 versus 2.39 L). Among children with no exposure to smoking, those with Arg16 or Gln27 showed lower adjusted geometric mean eNO levels compared with Gly16 homozygotes (15.4 versus 30.9 ppb) and Glu27 homozygotes (18.0 versus 49.7 ppb). In conclusion, passive smoking had a significant effect on associations between β2-adrenoceptor gene polymorphisms and asthma-related phenotypes, enhancing the relationship between Arg16 and lung function and removing the relationship between Arg16 or Gln27 and exhaled nitric oxide levels.