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Genotoxicity of freshwater ecosystem shows DNA damage in preponderant fish as validated by in vivo micronucleus induction in gill and kidney erythrocytes.
Mutat Res Genet Toxicol Environ Mutagen. 2014 Dec; 775-776:20-30.MR

Abstract

Genotoxicity of Anambra River was studied by micronucleus (MN) assay of preponderant fish species in the river. The micronucleus indices obtained were used as biomarker to estimate and predict pollution profile and possible danger of feeding on the aquatic species. Micronuclei profile of the fish was measured from gill and kidney erythrocytes using microscopic technique. Season, species and location effects on micronuclei, together with their interactions were also determined. Two major seasons (rainy and dry) and preponderant fish species in the river (Synodontis clarias, Linnaeus, 1758 and Tilapia nilotica, Linnaeus, 1757) were studied at five distinct locations that displayed differential environmental stresses. The study showed that the micronucleus index of fish is an excellent biomarker for measuring pollution level and genotoxicity of freshwater habitat. Season, species of fish and location affect micronuclei profile of the fish species sampled in the river. Disease outbreak among rural dwellers depending on the river for domestic and other uses is imminent and they lack knowledge on its health implication. Moreover, the study maintained that the micronuclei in fish could be measured from either the gill or kidney; however, gill is more efficient as it enables collection of several samples from the same individuals without sacrificing it, and Synodontis clarias fish species appeared to be more vulnerable to the genotoxic damage than Tilapia nilotica. Consequently, the study recommended regular monitoring (micronucleus tests) of edible aquatic life such as Synodontis clarias in order to eliminate the danger of people feeding on toxic metals, some of which are carcinogenic.

Authors+Show Affiliations

School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia. Electronic address: mobiako2@une.edu.au.Department of Animal Science and Technology, Nnamdi Azikiwe University, PMB 5025, Awka, Anambra, Nigeria.Department of Zoology, Nnamdi Azikiwe University, PMB 5025, Awka, Anambra, Nigeria.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25435352

Citation

Obiakor, M O., et al. "Genotoxicity of Freshwater Ecosystem Shows DNA Damage in Preponderant Fish as Validated By in Vivo Micronucleus Induction in Gill and Kidney Erythrocytes." Mutation Research. Genetic Toxicology and Environmental Mutagenesis, vol. 775-776, 2014, pp. 20-30.
Obiakor MO, Okonkwo JC, Ezeonyejiaku CD. Genotoxicity of freshwater ecosystem shows DNA damage in preponderant fish as validated by in vivo micronucleus induction in gill and kidney erythrocytes. Mutat Res Genet Toxicol Environ Mutagen. 2014;775-776:20-30.
Obiakor, M. O., Okonkwo, J. C., & Ezeonyejiaku, C. D. (2014). Genotoxicity of freshwater ecosystem shows DNA damage in preponderant fish as validated by in vivo micronucleus induction in gill and kidney erythrocytes. Mutation Research. Genetic Toxicology and Environmental Mutagenesis, 775-776, 20-30. https://doi.org/10.1016/j.mrgentox.2014.09.010
Obiakor MO, Okonkwo JC, Ezeonyejiaku CD. Genotoxicity of Freshwater Ecosystem Shows DNA Damage in Preponderant Fish as Validated By in Vivo Micronucleus Induction in Gill and Kidney Erythrocytes. Mutat Res Genet Toxicol Environ Mutagen. 2014;775-776:20-30. PubMed PMID: 25435352.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Genotoxicity of freshwater ecosystem shows DNA damage in preponderant fish as validated by in vivo micronucleus induction in gill and kidney erythrocytes. AU - Obiakor,M O, AU - Okonkwo,J C, AU - Ezeonyejiaku,C D, Y1 - 2014/10/07/ PY - 2014/06/23/received PY - 2014/09/25/revised PY - 2014/09/27/accepted PY - 2014/12/2/entrez PY - 2014/12/2/pubmed PY - 2015/1/22/medline KW - Anambra River KW - Aquatic pollution KW - Biomonitoring KW - Factorial effects KW - Synodontis clarias KW - Tilapia nilotica SP - 20 EP - 30 JF - Mutation research. Genetic toxicology and environmental mutagenesis JO - Mutat Res Genet Toxicol Environ Mutagen VL - 775-776 N2 - Genotoxicity of Anambra River was studied by micronucleus (MN) assay of preponderant fish species in the river. The micronucleus indices obtained were used as biomarker to estimate and predict pollution profile and possible danger of feeding on the aquatic species. Micronuclei profile of the fish was measured from gill and kidney erythrocytes using microscopic technique. Season, species and location effects on micronuclei, together with their interactions were also determined. Two major seasons (rainy and dry) and preponderant fish species in the river (Synodontis clarias, Linnaeus, 1758 and Tilapia nilotica, Linnaeus, 1757) were studied at five distinct locations that displayed differential environmental stresses. The study showed that the micronucleus index of fish is an excellent biomarker for measuring pollution level and genotoxicity of freshwater habitat. Season, species of fish and location affect micronuclei profile of the fish species sampled in the river. Disease outbreak among rural dwellers depending on the river for domestic and other uses is imminent and they lack knowledge on its health implication. Moreover, the study maintained that the micronuclei in fish could be measured from either the gill or kidney; however, gill is more efficient as it enables collection of several samples from the same individuals without sacrificing it, and Synodontis clarias fish species appeared to be more vulnerable to the genotoxic damage than Tilapia nilotica. Consequently, the study recommended regular monitoring (micronucleus tests) of edible aquatic life such as Synodontis clarias in order to eliminate the danger of people feeding on toxic metals, some of which are carcinogenic. SN - 1879-3592 UR - https://www.unboundmedicine.com/medline/citation/25435352/Genotoxicity_of_freshwater_ecosystem_shows_DNA_damage_in_preponderant_fish_as_validated_by_in_vivo_micronucleus_induction_in_gill_and_kidney_erythrocytes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1383-5718(14)00259-9 DB - PRIME DP - Unbound Medicine ER -