AI Article Synopsis
- Odysseus (OdsH) was identified as the first gene linked to hybrid sterility in Drosophila, originally thought to have originated from a specific gene duplication but actually dated back to 62 million years ago.
- OdsH has shown rapid evolutionary changes, particularly in male sexual functions, and its mutations in D. mauritiana may explain hybrid incompatibility.
- Further studies on related species indicated that OdsH’s role in hybrid sterility may be limited to D. mauritiana and D. simulans, suggesting its speciation influence might not extend to other Drosophila species.
Article Abstract
Odysseus (OdsH) was the first speciation gene described in Drosophila related to hybrid sterility in offspring of mating between Drosophila mauritiana and Drosophila simulans. Its origin is attributed to the duplication of the gene unc-4 in the subgenus Sophophora. By using a much larger sample of Drosophilidae species, we showed that contrary to what has been previously proposed, OdsH origin occurred 62 MYA. Evolutionary rates, expression, and transcription factor-binding sites of OdsH evidence that it may have rapidly experienced neofunctionalization in male sexual functions. Furthermore, the analysis of the OdsH peptide allowed the identification of mutations of D. mauritiana that could result in incompatibility in hybrids. In order to find if OdsH could be related to hybrid sterility, beyond Sophophora, we explored the expression of OdsH in Drosophila arizonae and Drosophila mojavensis, a pair of sister species with incomplete reproductive isolation. Our data indicated that OdsH expression is not atypical in their male-sterile hybrids. In conclusion, we have proposed that the origin of OdsH occurred earlier than previously proposed, followed by neofunctionalization. Our results also suggested that its role as a speciation gene might be restricted to D. mauritiana and D. simulans.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10917504 | PMC |
| http://dx.doi.org/10.1093/g3journal/jkad299 | DOI Listing |
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