Reflections on the development of micronucleus assays.

These are personal reflections on the development of methods to use micronuclei as a measure of genetic damage and their use in research and in toxicology by four people who have been intimately involved with this work, a personal rather than a comprehensive history. About 6000 papers have been published using such methods in many tissues in vivo or in cultured cells of many organisms from plants to humans, but the majority of the work has been on mammalian erythrocytes and human lymphocytes, the areas in which we have worked primarily. Although this is by no means a complete history, those working in the field may be interested in some of the personal events that lie behind the development and acceptance of methods that are now standard.

The role of the UKEMS in the development of testing guidelines.

Twenty years ago UKEMS established a sub-committee to determine the minimal professional criteria that should be achieved to comply with mutagenicity testing requirements in the UK. Recommendations on the conduct of basic and supplementary tests were published in 1983 and 1984, respectively. Despite their local distribution, these recommendations had an impact around the world. Further guidelines for statistical evaluation of mutagenicity test data and revisions to the first two volumes followed. By the early 1990s the mood was for international harmonization rather than national or regional isolation. The processes by which UKEMS had achieved its testing recommendations in the 1980s and early 1990s were successfully employed in the International Workshops for Genotoxicity Testing, of which three have now been held, and made a significant impact on OECD guidelines and ICH guidance. Summary outcomes from the latest meeting (2002 Plymouth Workshop) are given.

Achievements by CSGMT/JEMS.MMS: the Collaborative Study Group for the Micronucleus Test in the Mammalian Mutagenesis Study Group of the Environmental Mutagen Society of Japan.

The Collaborative Study Group for the Micronucleus Test (CSGMT) is one of the task groups in the Mammalian Mutagenesis Study Group (MMS) of the Environmental Mutagen Society of Japan (JEMS). It was established in 1982 and has made efforts to understand what the micronucleus test is, what are the advantages and disadvantages of the test as an in vivo detection system for mutagens/carcinogens, and to establish a standard protocol applicable to numerous chemicals. Members of the CSGMT have published more than 75 papers as part of collaborative studies and have contributed to the understanding of the nature of the micronucleus test and to setting guidelines for testing of medicinal and other chemicals. The CSGMT held some workshops to share up-to-date knowledge and techniques on the micronucleus test. Through workshops and collaborative studies, the CSGMT contributed to the maintaining of a high standard of knowledge and techniques among Japanese researchers of the micronucleus test. This paper reviews achievements made by the CSGMT until now.