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Prenatal PAH exposure is associated with chromosome-specific aberrations in cord blood

Manuela A Orjuela1, Xinhua Liu, Dorothy Warburton

  • 1Departments of Pediatrics (Oncology) , Environmental Health Sciences, Biostatistics and Genetics, Columbia University, New York, NY, United States. is2148@columbia.edu

Mutation Research
|August 17, 2010
PubMed

Insights

Prenatal exposure to polycyclic aromatic hydrocarbons (PAHs) is linked to chromosomal aberrations in newborns, particularly in specific chromosomes. This association raises concerns about potential long-term cancer risks in children exposed to airborne PAHs.

Area of Science:

  • Environmental Health
  • Genetics
  • Toxicology

Background:

  • Chromosomal aberrations are established risk factors for adult cancers.
  • Previous studies linked prenatal polycyclic aromatic hydrocarbon (PAH) exposure to chromosomal aberrations in cord blood.
  • The chromosome-specific nature and extent of this association required further investigation.

Purpose of the Study:

  • To determine if the association between airborne PAHs and chromosomal aberrations is chromosome-specific.
  • To investigate if this association extends to smaller chromosomes.
  • To assess the impact of prenatal PAH exposure on specific chromosome aberration frequencies.

Main Methods:

  • Analysis of 48 cord blood samples from newborns with monitored prenatal airborne PAH exposure.
  • Utilized whole chromosome paints for chromosomes 1-6, 11, 12, 14, 19, and a 6q sub-telomere probe.
  • Scored 1500 metaphases per sample to calculate stable aberration frequencies and examined associations with PAH levels.

Main Results:

  • Aberrations in chromosome 6 were more frequent than predicted by genomic content.
  • Prenatal PAH levels and aberration frequencies in chromosomes 1-6 were halved compared to previous reports.
  • Increased prenatal PAH exposure correlated with higher aberration frequencies in chromosomes 11-19 (p=0.02) and chromosome 6 (p=0.06), but not chromosomes 1-5.

Conclusions:

  • Prenatal airborne PAH exposure is specifically associated with aberrations in chromosomes 6, 11, 12, 14, and 19.
  • These chromosome-specific effects were observed even at lower airborne PAH levels.
  • The findings raise concerns regarding the potential cancer risk associated with prenatal PAH exposure.

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