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The relative simplicity of the micronucleated erythrocyte endpoint has made it amenable to automated scoring approaches. Flow cytometry is one such scoring platform that has been employed successfully. This review describes the evolution and properties of flow cytometry-based scoring of micronucleated erythrocytes. The methodology has become widely applied to rodent blood specimens and the high throughput nature of the technology provides a number of advantages over manual microscopic scoring. For instance, the ability to efficiently survey many dose levels and many more cells per specimen relative to microscopy benefits studies that are designed to identify no observable effect levels or lowest observable effect levels. Furthermore, flow cytometry makes it practical to study species with low spontaneous reticulocyte (RET) counts and micronucleus (MN) frequencies, thereby facilitating integration of blood-based micronucleated reticulocyte (MN-RET) frequency measurements into experiments conducted across species of toxicological interest. This capability enhances genotoxicity assessments that have historically been made in dedicated MN tests performed in one species. Importantly, the feasibility of using MN-RET frequencies in blood from humans as an index of genetic damage in bone marrow opens a critical area of application that had not been practical previously. We conclude with recommendations for additional work that is needed to more fully realise the potential of flow cytometric in vivo MN scoring.

Flow cytometric scoring of micronucleated erythrocytes: an efficient platform for assessing in vivo cytogenetic damage