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• W2035289394 abstract "The cytokinesis-block micronucleus (CBMN) assay has been adopted by numerous laboratories as a means for rapidly assessing base-line chromosome damage (breakage and loss) in human populations. However, the appropriate implementations of this assay requires a through understanding of both experimental variables and biological factors that can have impact on micronucleus (MN) frequency. The paper describes, with the help of experimental data the from the author's laboratory as well as other data, the impact of these variable. With regards to experimental variables, the scoring of micronuclei on slides by different technicians has been identified as an important factor; however, the use of different culture media, namely RPMI 1640 and McCoy's medium, did not have a significant effect on base-line frequencies. The paper also describes results showing that the MN index in cytokinesis-blocked cells, measured once every three months over a 12-month period for 53 healthy subjects, remains constant and the data measured on these ocasions were significantly and positively correlated (R=0.477 to 0.684, P<0.0001) with each other thus indicating the reliability and intra-individual variability of the assay over time. Inter-individual variation for males and female subjects has been estimated for each decade of age between 20 and 80 years; the difference between the 25th and 75th percentile of MN frequency varied between 1.4 fold and 2.3 fold and the minimum and maximum values for MN frequency varied by a factor of 4.7 and 12.5 depending on the age group. Age and gender are the most important demographic variables impacting on the MN index with MN frequencies in females being greater than those in males by a factor of 1.2 to 1.6 depending on the age group. For both sexes, MN frequency was significantly and positively correlated with age (R=0.62 in males and R=0.65 in females) and the slope of the regression line in males was 0.314 (P<0.0001) and in females it was 0.517 (P<0.0001). The main dietary factors influencing the MN index in subjects who are not folate deficient are plasma B12 (R=−0.315, P=0.0127) and plasma homocysteine (R=0.415, P=0.0086). In addition, it was proposed that the MN index is likely to be influenced by the propensity of an individual's cells to undergo apoptosis when damaged so that one might expect the MN frequency to be negatively correlated with apoptotic rate although this has yet to be tested. The above indicates the importance of maintaining an international network of scientists working with the CBMN assay to ensure appropriate quality control and for the development of standard experimental and documentation protocols. The human micronucleus (HUMN) project lauched in 1997 is briefly described and proposed as the vehichle for these activities." @default.
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• W2035289394 date "1998-08-01" @default.
• W2035289394 modified "2023-10-17" @default.
• W2035289394 title "Important variables that influence base-line micronucleus frequency in cytokinesis-blocked lymphocytes—a biomarker for DNA damage in human populations" @default.
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• W2035289394 doi "https://doi.org/10.1016/s0027-5107(98)00109-2" @default.
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