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Xiaobin Wang, MD,MPH,ScD; Barry Zuckerman, MD; Colleen Pearson, BA; Gary Kaufman, MD; Changzhong Chen, MD; Guoying Wang, MD,PhD; Tianhua Niu, ScD; Paul H. Wise, MD,MPH; Howard Bauchner, MD; Xiping Xu, MD,PhD,MS

JAMA. 2002;287:195-202.

Context  Little is known about genetic susceptibility to cigarette smoke in relation to adverse pregnancy outcomes.

Objective  To investigate whether the association between maternal cigarette smoking and infant birth weight differs by polymorphisms of 2 maternal metabolic genes: CYP1A1 and GSTT1.

Design, Setting, and Participants  Case-control study conducted in 1998-2000 among 741 mothers (174 ever smokers and 567 never smokers) who delivered singleton live births at Boston Medical Center. A total of 207 cases were preterm or low-birth-weight infants and 534 were non–low-birth-weight, full-term infants (control).

Main Outcome Measure  Birth weight, gestation, fetal growth by smoking status and CYP1A1 MspI (AA vs Aa and aa, where Aa and aa were combined because of small numbers of aa and similar results), and GSTT1 (present vs absent) genotypes.

Results  Without consideration of genotype, continuous maternal smoking during pregnancy was associated with a mean reduction of 377 g (SE, 89 g) in birth weight (odds ratio [OR], 2.1; 95% confidence interval [CI], 1.2-3.7). When CYP1A1 genotype was considered, the estimated reduction in birth weight was 252 g (SE, 111 g) for the AA genotype group (n = 75; OR, 1.3; 95% CI, 0.6-2.6), but was 520 g (SE, 124 g) for the Aa/aa genotype group (n = 43 for Aa, n = 6 for aa; OR, 3.2; 95% CI, 1.6-6.4). When GSTT1 genotype was considered, the estimated reduction in birth weight was 285 g (SE, 99 g) (OR, 1.7; 95% CI, 0.9-3.2) and 642 g (SE, 154 g) (OR, 3.5; 95% CI, 1.5-8.3) for the present and absent genotype groups, respectively. When both CYP1A1 and GSTT1 genotypes were considered, the greatest reduction in birth weight was found among smoking mothers with the CYP1A1 Aa/aa and GSTT1 absent genotypes (-1285 g; SE, 234 g; P<.001). Among never smokers, genotype did not independently confer an adverse effect. A similar pattern emerged in analyses stratified by maternal ethnicity and in analyses for gestation.

Conclusions  In our study, maternal CYP1A1 and GSTT1 genotypes modified the association between maternal cigarette smoking and infant birth weight, suggesting an interaction between metabolic genes and cigarette smoking.

Author Affiliations: Department of Pediatrics (Drs X. Wang, Zuckerman, Wise, and Bauchner and Ms Pearson) and Department of Obstetrics and Gynecology (Dr Kaufman), Boston University School of Medicine and Boston Medical Center, and Program for Population Genetics, Harvard School of Public Health (Drs Chen, Niu, and Xu), Boston, Mass; and Center for Ecogenetics and Reproductive Health, Beijing Medical University, Beijing, China (Dr G. Wang).

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