CYP1A1 modifies the effect of maternal exposure to environmental tobacco smoke on child behavior.
BACKGROUND
Maternal environmental tobacco smoke (ETS) has been identified as a key risk factor for problem behavior in children, but the role of genetic susceptibility is not clear. The purpose of this study was to examine the metabolic genetic modification effect of exposure to ETS in nonsmoking mothers on child behavior at 2 years of age.


METHODS
A prospective cohort study was conducted among 191 mothers who gave births between 2004 and 2005 and their infants in Taiwan. The mothers completed a questionnaire before delivery in which they provided information on exposure to ETS during pregnancy. Four metabolic genes, CYP1A1 MspI, CYP1A1 Ile462Val, GSTT1, and GSTM1 were isolated from both maternal and infant DNA samples. Children's behavior problems at 2 years of age were reported by their mothers using the Child Behavior Checklist/1.5-5. Multiple linear models were used to estimate the effects of ETS and genotype on child behavior.


RESULTS
Maternal ETS exposure was associated with the anxious score. The ETS-exposed group with both the CYP1A1 MspI and the CYP1A1 Ile462Val variants had higher scores, as reflected in total CBCL score as well as scores on the internalizing scale and its emotional subdomain, the anxious scale, and the externalizing scale and its aggressive subdomain.


CONCLUSIONS
Child behavioral problems may be associated with prenatal ETS exposure, and this effect may be modified by infant CYP1A1 MspI and CYP1A1 Ile462Val genes.
Hsieh
Chia-Jung
CJ
Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University College of Public Health, 17 Syujhou Rd., Taipei 100, Taiwan.
Jeng
Suh-Fang
SF
Su
Yi-Ning
YN
Liao
Hua-Fang
HF
Hsieh
Wu-Shiun
WS
Wu
Kuen-Yuh
KY
Chen
Pau-Chung
PC
D000328:Adult; D002652:Child Behavior; D002653:Child Behavior Disorders / Q000209:etiology / Q000235:genetics*; D002675:Child, Preschool; D015331:Cohort Studies; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D004781:Environmental Exposure / Q000009:adverse effects*; D004785:Environmental Pollutants / Q000009:adverse effects*; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D011110:Polymorphism, Genetic; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects / Q000235:genetics*; D011446:Prospective Studies; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects*; D013624:Taiwan
D004785:Environmental Pollutants; D019363:Cytochrome P-450 CYP1A1