Mother's curse is pervasive across a large mitonuclear Drosophila panel
Data files
Jan 23, 2025 version files 52.20 KB
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lorcan.xlsx
51.43 KB
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README.md
770 B
Abstract
The maternal inheritance of mitochondrial genomes entails a sex-specific selective sieve, whereby mutations in mitochondrial DNA can only respond to selection acting on females. In theory, this enables male-harming mutations to accumulate in mitochondrial genomes as long as they are neutral, beneficial, or only slightly deleterious to females. Ultimately, this bias could drive the evolution of male-specific mitochondrial mutation loads, an idea known as the mother's curse. Earlier work on this hypothesis has mainly used small Drosophila panels, in which naturally sourced mitochondrial genomes were coupled to an isogenic nuclear background. The lack of nuclear genetic variation in these designs has precluded robust generalization. Here, we test the predictions of the mother's curse using a large Drosophila mitonuclear genetic panel, comprising nine isogenic nuclear genomes coupled to nine mitochondrial haplotypes, giving a total of 81 different mitonuclear genotypes. Following a predictive framework, we tested the mother's curse hypothesis by screening our panel for wing size. This trait is tightly correlated with overall body size and is sexually dimorphic in Drosophila. Moreover, growth is heavily reliant on metabolism and mitochondrial function, making wing size an ideal trait for the study of the impact of mitochondrial variation. We detect high levels of mitonuclear epistasis, and more importantly, we report that mitochondrial genetic variance is larger in male than female Drosophila for eight out of the nine nuclear genetic backgrounds used. These results demonstrate that the maternal inheritance of mitochondrial DNA does indeed modulate male life history traits in a more generalisable way than previously demonstrated.
README: Mother’s curse is pervasive across a large mito-nuclear Drosophila panel
https://doi.org/10.5061/dryad.2280gb5r2
Description of the data and file structure
For this paper, we looked at wing centroid size across several genotypes of Drosophila with different mitonuclear combinations (81 genotypes total).
Genotype: [Nuclear genotype][mtDNA genotype]
So there are 9 possible nuclear genomes (A, B, C, D, E, F, G, H, i) and 9 different mtDNA haplotypes (A, B, C, D, E, F, G, H, i).
For example, genotype AC has the nuclear genome from the line "A" and mtDNA from line "C".
Files and variables
File: lorcan.xlsx
Description:
Variables
- Line: genotype
- sex
- mm: centroid size (millimeters)