Abstract
Based on studies of the influence of X-chromosomes on the viability of Drosophila melanogaster exposed to cadmium, and on the role of X-linked genes on copper homeostasis, we examined the effect of copper sulfate (CuSO4) on offspring viability using three independent, inbred D. melanogaster crosses (ensuring identical autosomes for males and females within each cross). Each cross was performed with attached X-chromosome females and males with a single X-chromosome. As female D. melanogaster have less metallothionein RNA expression than males, we predicted fewer female offspring than male offspring in crosses exposed to CuSO4, even though females have two copies of X-chromosome genes, possibly resulting in overdominant heterozygosity. In two of three crosses, CuSO4 caused significantly higher numbers of male offspring compared to female offspring. We hypothesized that these gender-based viability differences to copper exposure are caused by X-chromosome ploidy and X-linked genetic variation affecting metallothionein expression. Observed differential offspring viability responses among crosses to copper exposure also showed that different genetic backgrounds (autosomal and/or X-chromosome) can result in significant differences in heavy metal and metallothionein regulation. These results suggest that the effect of copper on offspring viability depends on both genetic background and gender, as both factors can affect the regulation of metallothionein proteins as well as homeostasis of biologically necessary heavy metals.
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Acknowledgements
The authors thank Juan L. Bouzat, Daniel D. Wiegmann, Scott O. Rogers, and Paul A. Moore, as well as two anonymous reviewers for their comments and suggestions on the manuscript.
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Balinski, M.A., Woodruff, R.C. Differential sexual survival of Drosophila melanogaster on copper sulfate. Genetica 145, 131–137 (2017). https://doi.org/10.1007/s10709-017-9951-4
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DOI: https://doi.org/10.1007/s10709-017-9951-4