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Genotoxic sensitivity of the developing hematopoietic system.

Ion Udroiu1, Antonella Sgura1

  • 1Dipartimento di Scienze, Università Roma Tre, Viale G. Marconi 446, 00146 Rome, Italy.

Mutation Research. Reviews in Mutation Research
|April 3, 2016
PubMed
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Genotoxic sensitivity is higher in fetuses and newborns than adults, particularly in the hematopoietic system. This increased susceptibility may stem from reduced DNA repair capacity during development.

Keywords:
FetalGenotoxicityHemopoieticHumanInfantMurine

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Area of Science:

  • Developmental Biology
  • Toxicology
  • Genetics

Background:

  • Genotoxic sensitivity varies with ontogenetic development.
  • Studies indicate higher spontaneous mutation rates and DNA damage in fetuses/newborns compared to adults.
  • Reduced DNA repair capacity is a potential cause for increased susceptibility in early life stages.

Purpose of the Study:

  • To review literature on genotoxicity testing in the hematopoietic system during ontogenetic development.
  • To compare genotoxic sensitivity between fetal/newborn and adult organisms.
  • To elucidate the developmental trajectory of genotoxic susceptibility.

Main Methods:

  • Literature review focusing on the micronucleus test, a validated genotoxicity assay.
  • Analysis of studies involving both untreated and mutagen-treated animals.
  • Comparison of genotoxicity data across different developmental stages (fetus/newborn vs. adult).

Main Results:

  • The micronucleus test consistently showed higher genotoxicity values in fetuses/newborns compared to adults.
  • This pattern was observed in both untreated and genotoxic substance-treated groups.
  • Evidence suggests certain DNA repair pathways are deficient during ontogenesis, particularly in hematopoietic stem cells.

Conclusions:

  • The hematopoietic system exhibits heightened genotoxic sensitivity during fetal life.
  • Genotoxic sensitivity decreases progressively during ontogenetic development.
  • Understanding developmental genotoxicity is crucial for risk assessment and leukemogenesis research.