Abstract
The mus309 gene in Drosophila melanogaster encodes a RecQ helicase which is involved in DNA double-strand break (DSB) repair. In a brood pattern analysis, it was observed that in mus309 mutant females, the frequency of single crossovers in the central cv–v interval of the X chromosome was reduced in young females but returned to the level of the wild type control as the females aged. In the proximal v–f interval, the frequency of single crossovers was increased during the entire experimental period. In particular, it was observed that the frequency of double crossovers, as well as the coefficient of coincidence first increased but then gradually decreased, finally reaching the level of the control flies, as the females aged. Map distances increased due to the mus309 mutation in both gene interval studies, but they did not change as the females aged, a result suggesting that the mus309 gene controls the distribution of DSBs to be repaired as crossovers instead of non-crossovers. The results suggest a mechanism for the centromere effect of crossing over in Drosophila, viz the fact the frequency of meiotic crossing over reduces with the age of the female, and that the reduction is more pronounced the closer the interval is to the proximal heterochromatin of the chromosome arm. According to the model suggested, the centromere effect is simply a matter of the balance between different pathways of the repair of the DSBs of DNA.
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Acknowledgments
Thanks are given to Professor Janos Szabad (Szeged, Hungary) for introducing me to the mus309 gene, and the generous donation of the mutant stocks. Skilful technical assistance by Mirja Rantanen, M.Sc. is gratefully acknowledged. Docent Kai Ruohomäki, PhD, and Mia Rönkä, M.Sc., helped me by conducting the statistical analyses, and Kurt Ståhle, the technician, by drawing the figures. To all of them I am very grateful. Special thanks are given to Maaria Tringham, M.Sc., and Damon Tringham, M.Phil., for checking the language.
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This article was retracted due to plagiarism.
An erratum to this article can be found at http://dx.doi.org/10.1007/s10709-010-9519-z
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Portin, P. RETRACTED ARTICLE: The effect of the mus309 mutation, defective in DNA double-strand break repair, on crossing over in Drosophila melanogaster suggests a mechanism for the centromere effect of crossing over. Genetica 138, 333–342 (2010). https://doi.org/10.1007/s10709-009-9422-7
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DOI: https://doi.org/10.1007/s10709-009-9422-7