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One prophage WO gene rescues cytoplasmic incompatibility in Drosophila melanogaster
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One prophage WO gene rescues cytoplasmic incompatibility in Drosophila melanogaster
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One prophage WO gene rescues cytoplasmic incompatibility in Drosophila melanogaster
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Journal Article
One prophage WO gene rescues cytoplasmic incompatibility in Drosophila melanogaster
2018
Overview
Wolbachia are maternally inherited, intracellular bacteria at the forefront of vector control efforts to curb arbovirus transmission. In international field trials, the cytoplasmic incompatibility (CI) drive system of wMel Wolbachia is deployed to replace target vector populations, whereby a Wolbachia-induced modification of the sperm genome kills embryos. However, Wolbachia in the embryo rescue the sperm genome impairment, and therefore CI results in a strong fitness advantage for infected females that transmit the bacteria to offspring. The two genes responsible for the wMel-induced sperm modification of CI, cifA and cifB, were recently identified in the eukaryotic association module of prophage WO, but the genetic basis of rescue is unresolved. Here we use transgenic and cytological approaches to demonstrate that maternal cifA expression independently rescues CI and nullifies embryonic death caused by wMel Wolbachia in Drosophila melanogaster. Discovery of cifA as the rescue gene and previously one of two CI induction genes establishes a “Two-by-One” model that underpins the genetic basis of CI. Results highlight the central role of prophage WO in shaping Wolbachia phenotypes that are significant to arthropod evolution and vector control.
Publisher
National Academy of Sciences
Subject
