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Application of the micronucleus test and comet assay in Trachemys callirostris erythrocytes as a model for in situ genotoxic monitoring.
Ecotoxicol Environ Saf. 2016 May; 127:108-16.EE

Abstract

Trachemys callirostris is a turtle species endemic to northern South America. In northern Colombia it occurs in the middle and lower Magdalena River drainage and its principal tributaries (lower Cauca and San Jorge rivers) and in other minor drainages such as the lower Sinú River. In recent years, industrial, agricultural, and mining activities have altered natural habitats in Colombia where this species occurs, and many of the pollutants released there are known to induce genetic alterations in wildlife species. The micronucleus test and comet assay are two of the most widely used methods to characterize DNA damage induced by physical and chemical agents in wildlife species, but have not been employed previously for genotoxic evaluations in T. callirostris. The goal of this study was to optimize these genotoxic biomarkers for T. callirostris erythrocytes in order to establish levels of DNA damage in this species and thereby evaluate its potential as a sentinel species for monitoring genotoxic effects in freshwater environments in northern Colombia. Both genotoxic techniques were applied on peripheral blood erythrocytes from 20 captive-reared T. callirostris individuals as a negative control, as well as from samples obtained from 49 individuals collected in Magangué (Magdalena River drainage) and 24 individuals collected in Lorica (Sinú River drainage) in northern Colombia. Negative control individuals exhibited a baseline frequency of micronuclei of 0.78±0.58 and baseline values for comet tail length and tail moment of 3.34±0.24µm and 10.70±5.5, respectively. In contrast, samples from both field sites exhibited significantly greater evidence of genotoxic effects for both tests. The mean MN frequencies in the samples from Magangué and Lorica were 8.04±7.08 and 12.19±12.94, respectively. The mean tail length for samples from Magangué and Lorica were 5.78±3.18 and 15.46±7.39, respectively. Finally, the mean tail moment for samples from Magangué and Lorica were 23.59±18.22 and 297.94±242.18, respectively. The frequency of micronuclei in the samples was positively related to comet tail length and tail moment. Thus, this study showed that both genotoxicity biomarkers may be applied to T. callirostris erythrocytes as a sentinel organism for assessing the effects of environmental pollutants in freshwater ecosystems in northern South America.

Authors+Show Affiliations

Grupo de Investigación en Gestión y Modelación Ambiental-GAIA - SIU, Cl. 62 No. 52-59, Universidad de Antioquia, Medellín, Colombia. Electronic address: zapata.lina@gmail.com.Grupo Herpetológico de Antioquia, Cl. 67 No. 52-59, Universidad de Antioquia, Medellín, Colombia.Grupo de Investigación en Gestión y Modelación Ambiental-GAIA - SIU, Cl. 62 No. 52-59, Universidad de Antioquia, Medellín, Colombia.Grupo de Investigación en Gestión y Modelación Ambiental-GAIA - SIU, Cl. 62 No. 52-59, Universidad de Antioquia, Medellín, Colombia.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26809080

Citation

Zapata, Lina M., et al. "Application of the Micronucleus Test and Comet Assay in Trachemys Callirostris Erythrocytes as a Model for in Situ Genotoxic Monitoring." Ecotoxicology and Environmental Safety, vol. 127, 2016, pp. 108-16.
Zapata LM, Bock BC, Orozco LY, et al. Application of the micronucleus test and comet assay in Trachemys callirostris erythrocytes as a model for in situ genotoxic monitoring. Ecotoxicol Environ Saf. 2016;127:108-16.
Zapata, L. M., Bock, B. C., Orozco, L. Y., & Palacio, J. A. (2016). Application of the micronucleus test and comet assay in Trachemys callirostris erythrocytes as a model for in situ genotoxic monitoring. Ecotoxicology and Environmental Safety, 127, 108-16. https://doi.org/10.1016/j.ecoenv.2016.01.016
Zapata LM, et al. Application of the Micronucleus Test and Comet Assay in Trachemys Callirostris Erythrocytes as a Model for in Situ Genotoxic Monitoring. Ecotoxicol Environ Saf. 2016;127:108-16. PubMed PMID: 26809080.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Application of the micronucleus test and comet assay in Trachemys callirostris erythrocytes as a model for in situ genotoxic monitoring. AU - Zapata,Lina M, AU - Bock,Brian C, AU - Orozco,Luz Yaneth, AU - Palacio,Jaime A, Y1 - 2016/01/22/ PY - 2015/07/02/received PY - 2016/01/06/revised PY - 2016/01/14/accepted PY - 2016/1/26/entrez PY - 2016/1/26/pubmed PY - 2016/10/19/medline KW - Comet assay KW - Genotoxicity KW - Micronucleus test KW - Trachemys callirostris SP - 108 EP - 16 JF - Ecotoxicology and environmental safety JO - Ecotoxicol Environ Saf VL - 127 N2 - Trachemys callirostris is a turtle species endemic to northern South America. In northern Colombia it occurs in the middle and lower Magdalena River drainage and its principal tributaries (lower Cauca and San Jorge rivers) and in other minor drainages such as the lower Sinú River. In recent years, industrial, agricultural, and mining activities have altered natural habitats in Colombia where this species occurs, and many of the pollutants released there are known to induce genetic alterations in wildlife species. The micronucleus test and comet assay are two of the most widely used methods to characterize DNA damage induced by physical and chemical agents in wildlife species, but have not been employed previously for genotoxic evaluations in T. callirostris. The goal of this study was to optimize these genotoxic biomarkers for T. callirostris erythrocytes in order to establish levels of DNA damage in this species and thereby evaluate its potential as a sentinel species for monitoring genotoxic effects in freshwater environments in northern Colombia. Both genotoxic techniques were applied on peripheral blood erythrocytes from 20 captive-reared T. callirostris individuals as a negative control, as well as from samples obtained from 49 individuals collected in Magangué (Magdalena River drainage) and 24 individuals collected in Lorica (Sinú River drainage) in northern Colombia. Negative control individuals exhibited a baseline frequency of micronuclei of 0.78±0.58 and baseline values for comet tail length and tail moment of 3.34±0.24µm and 10.70±5.5, respectively. In contrast, samples from both field sites exhibited significantly greater evidence of genotoxic effects for both tests. The mean MN frequencies in the samples from Magangué and Lorica were 8.04±7.08 and 12.19±12.94, respectively. The mean tail length for samples from Magangué and Lorica were 5.78±3.18 and 15.46±7.39, respectively. Finally, the mean tail moment for samples from Magangué and Lorica were 23.59±18.22 and 297.94±242.18, respectively. The frequency of micronuclei in the samples was positively related to comet tail length and tail moment. Thus, this study showed that both genotoxicity biomarkers may be applied to T. callirostris erythrocytes as a sentinel organism for assessing the effects of environmental pollutants in freshwater ecosystems in northern South America. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/26809080/Application_of_the_micronucleus_test_and_comet_assay_in_Trachemys_callirostris_erythrocytes_as_a_model_for_in_situ_genotoxic_monitoring_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0147-6513(16)30016-1 DB - PRIME DP - Unbound Medicine ER -