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Exploring the associations between prenatal PCB exposures and gene expression: Observations from a study of newborn
Amara Saleem1, Andrew Volz1, Tanmoy Mondal2
1Department of Oncology, Georgetown University, Washington, DC 20057, USA.
Insights
Prenatal exposure to Polychlorinated biphenyls (PCBs) in mothers and newborns is linked to altered gene expression. This study highlights the impact of environmental contaminants on early development and gene regulation.
Area of Science:
- Environmental Health
- Toxicology
- Molecular Biology
Background:
- Polychlorinated biphenyls (PCBs) are persistent organic pollutants with known adverse effects on development.
- Limited data exists on the relationship between mother-newborn PCB exposure levels and their molecular impact.
- Understanding prenatal PCB exposure is crucial for assessing developmental risks.
Purpose of the Study:
- To investigate the association between prenatal Polychlorinated biphenyls (PCBs) exposure and gene expression in mother-infant pairs.
- To identify specific genes dysregulated by varying levels of maternal and cord blood PCB concentrations.
- To explore gender-specific gene expression differences related to PCB exposure.
Main Methods:
- Serum PCB concentrations were measured in 91 mother-infant pairs using gas chromatography and high-resolution mass spectrometry.
- Gene expression profiling was conducted using Affymetrix microarray (Human Genome U133 Plus 2.0).
- Statistical analysis compared gene expression between high and low PCB exposure groups.
Main Results:
- Maternal and cord blood PCB concentrations were highly correlated.
- Higher PCB levels were associated with differential expression of multiple genes.
- Significant dysregulation observed in genes including XIST, EXOC6B, EIF1AY, RPS4Y1 (global) and RUFY1, S100A8, ELOVL7, FXYD3, DEFB124, DAB2 (gender-based).
Conclusions:
- Prenatal PCB exposure significantly impacts gene expression in both mothers and newborns.
- Environmental PCB contamination poses a risk to early development through molecular pathways.
- Further research is needed to confirm these findings and understand the long-term consequences of PCB exposure.
Abstract:
Polychlorinated biphenyls (PCBs) are persistent organic pollutants known to have deleterious effects on child and adult development; however, less is known about the relationship between mother-newborn exposure levels. The objective of this study is to understand prenatal PCB exposure and its association with gene expression, using data from a cohort of exposed mothers and infants in eastern Slovakia. For 91 mothers and infants participating in this study, serum PCB concentrations were determined using gas chromatography and high-resolution mass spectrometry. Affymetrix microarray was performed utilizing Human Genome U133 Plus 2.0 gene chip. Statistical analysis compared the genetic expression levels of high versus low exposure mother-infant pairs (< 368.57 ng/g lipid vs. > 368.57 ng/g lipid). Statistical analysis results showed that mother's blood and cord blood PCB concentrations were highly correlated. Results showed that higher levels of PCB concentrations were associated with differential expressions of multiple genes. Global gene analysis identified significant dysregulation of genes XIST, EXOC6B, EIF1AY, and RPS4Y1. Gender-based gene analysis identified significant dysregulation of genes RUFY1, S100A8, ELOVL7, FXYD3, DEFB124, and DAB2. Further such investigations should be implemented to confirm these observations and more fully define the legacy of environmental PCB contamination.
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