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Environmental genotoxicity evaluation using cytogenetic end points in wild rodents
A M de Souza Bueno1, C A de Bragança Pereira, M N Rabello-Gay
1Universidade Federal de Santa Catarina, Departamento de Biologia Celular, Embriologia e Genética, Florianópolis, Brazil. bueno@ccb.ufsc.br
Environmental Health Perspectives
|January 3, 2001
Summary
This study used wild rodents to assess environmental genotoxicity in Brazil. Rodent cytogenetic biomarkers effectively detected pollutants, highlighting the need for multiple species and endpoints to identify environmental risks.
Area of Science:
- Environmental toxicology
- Genetics
- Ecotoxicology
Background:
- Industrial and agricultural activities can release genotoxic agents into the environment.
- Wild rodent populations can be exposed to environmental contaminants.
- Cytogenetic endpoints serve as sensitive biomarkers for genotoxicity.
Purpose of the Study:
- To evaluate the effectiveness of various cytogenetic endpoints in establishing a genotoxic profile for different environmental areas.
- To assess the performance of Akodon montensis and Oryzomys nigripes as bioindicators of genotoxicity.
- To compare the sensitivity of different cytogenetic biomarkers and species in detecting genotoxic effects.
Main Methods:
- Analysis of cytogenetic endpoints in Akodon montensis and Oryzomys nigripes populations.
- Populations were sampled from industrial, agricultural, and preservation areas in the Itajaí Valley, Brazil.
- Evaluated endpoints included polychromatic/normochromatic cell ratio, mitotic index, micronucleated cell frequency (bone marrow and peripheral blood), and chromosome aberration frequency (bone marrow).
Main Results:
- The selected cytogenetic endpoints demonstrated efficacy as biomarkers for early genotoxic agent detection.
- Species and populations at higher risk of genotoxic exposure were identified.
- Differences in species sensitivity to cytogenetic endpoints were observed, indicating the need for multiple bioindicator species.
Conclusions:
- Utilizing at least two sympatric species is crucial for accurately detecting genotoxins in specific localities.
- Employing a combination of several cytogenetic endpoints is necessary for a comprehensive genotoxic profile of an area.
- Cytogenetic biomonitoring in wild rodents provides valuable insights into environmental genotoxicity and associated risks.