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Baseline micronuclei frequency in children: estimates from meta- and pooled analyses
Monica Neri1, Marcello Ceppi, Lisbeth E Knudsen
1Unit of Epidemiology and Biostatistics, National Cancer Research Institute, Genoa, Italy.
Environmental Health Perspectives
|September 6, 2005
Summary
Environmental genotoxic exposure in children is increasingly studied using micronuclei (MN) frequency. This study provides reference MN values for children, finding lower frequencies in newborns but no sex difference.
Area of Science:
- Environmental Health
- Genotoxicology
- Pediatric Biomarkers
Background:
- Growing research on environmental genotoxic agents' effects on children.
- Micronuclei (MN) frequency in lymphocytes is a key biomarker, but shows high variability.
- Need for reference measures to validate protocols and assess study quality.
Purpose of the Study:
- To estimate baseline micronuclei (MN) frequency in children.
- To establish reference values for MN in pediatric populations.
- To address inter- and intralaboratory variability in MN assays.
Main Methods:
- Meta-analysis of 13 published field studies on MN frequency in children.
- Pooled analysis of individual data from 12 laboratories via the Human Micronucleus International Collaborative Study (HUMN) database.
- Statistical analysis to determine overall MN frequency, and effects of age and sex.
Main Results:
- Overall mean MN frequency estimated at 4.48 (meta-analysis) and 5.70 (pooled analysis) per 1,000 binucleated cells.
- Significantly lower MN frequency observed in newborns compared to older children.
- No significant influence of sex on MN frequency was detected.
Conclusions:
- Collaborative studies provide robust data for establishing reference MN frequencies in children.
- Synergistic use of meta-analysis and pooled data analysis is advantageous for biomarker studies.
- Reference values are crucial for validating assays and improving the quality of molecular epidemiology studies in children.