Biomonitoreo Genético en Trabajadores del Servicio de Radiología del Hospital Nacional Policial Luis N. Sáenz / Genetic Biomonitoring In Workers Of The Radiology Service Of National Police Hospital Luis N. Sáenz

Objetivo: Evaluar el efecto genotóxico en trabajadores expuestos a Rayos X en el Servicio de Radiología del Hospital Nacional Luis N. Sáenz PNP. Materiales y métodos. El tipo de estudio fue observacional, prospectivo, transversal, analítico, utilizando el ensayo cometa como técnica de análisis. La población de estudio fue de 20 trabajadores expuestos a los Rayos X y 20 personas sin exposición. Resultados. La media de longitud de migración de ADN dañado en el grupo control fue de 1,28±0.38 µm y 10,39±9.44 µm para el grupo expuesto, se compararon las medias de los grupos, obteniéndose p=0,001 significativo. El análisis de correlación para el daño de ADN, años de exposición y dosis recibida, se encontró una correlación significativa (p<0,05). Para la correlación del daño de ADN con la edad, no se encontró significancia estadística (p>0,05). Conclusiones. Los rayos X a bajas dosis permisibles pueden causar daño en la integridad del ADN, teniendo correlación con los primeros años de exposición en el personal que trabaja en el servicio radiología. Palabras clave: Genotóxico, exposición, rayos X, ensayo cometa.

Objective: To evaluate the genotoxic effect on workers exposed to X-rays in the Radiology Service of the Luis N. Sáenz National Hospital PNP. Materials and methods. The type of study was observational, prospective, cross-sectional, analytical, using the comet assay as an analysis technique. The study population was 20 workers exposed to X-rays and 20 people without exposure. Results The mean length of migration of damaged DNA in the control group was 1.28 ± 0.38 µm and 10.39 ± 9.44 µm for the exposed group, the means of the groups were compared, obtaining p = 0.001 significant. The correlation analysis for DNA damage, years of exposure and dose received, a significant correlation was found (p <0.05). For the correlation of DNA damage with age, no statistical significance was found (p> 0.05). Conclusions X-rays at low permissible doses can cause damage to DNA integrity, correlating with the first years of exposure of personnel working in the radiology service. Keywords: Genotoxic, exposure, X-ray, comet test.

Comet and cytogenetic tests as tools for evaluating genomic instability in seeds of Oryza sativa L. and Phaseolus vulgaris L. from gene banks

Abstract This study aimed to assess the feasibility of comet and cytogenetic tests as tools for evaluating genomic instability in seeds of Oryza sativa L. (rice) and Phaseolus vulgaris (beans) L. from gene banks. Rice and beans were exposed to methyl methanesulfonate (MMS) as a reference DNA damaging agent. Seeds of two accessions of rice and beans were obtained from Embrapa Rice and Beans - Brazil. Seed groups were imbibed in three concentrations of MMS for three periods of time to carry out cytogenetic tests, and for one period for the comet test. At concentrations of 10 and 15 mg/L, MMS induced cytotoxic and/or mutagenic effects in the meristematic cells of roots from all the accessions of both species. In the comet test, MMS induced genotoxic effects at all the concentrations in the evaluated accessions of rice and beans, except in one accession of beans at the lowest concentration (5 mg/L). Both species showed sensitivity to MMS. The comet test can be proposed for the measurement of genomic instability in accessions of rice and beans in gene banks, as being more sensitive than the cytogenetic tests used.