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Naturally-occurring Wolbachia infection in Drosophila simulans that does not cause cytoplasmic incompatibility
A A Hoffmann1, D Clancy, J Duncan
1School of Genetics and Human Variation, La Trobe University, Bundoora, Victoria, Australia.
Abstract:
Microbes of the genus Wolbachia are transmitted by their hosts via the maternal parent and are responsible for cytoplasmic incompatibility among insect populations. This phenomenon can result in Wolbachia spreading through natural populations as previously demonstrated in Drosophila simulans. Here we describe another Wolbachia infection in D. simulans that does not cause cytoplasmic incompatibility. This is a property of the Wolbachia rather than the nuclear background. The infection occurs at a low frequency in natural populations from eastern Australia. The infection shows perfect maternal transmission in the field and does not cause any detectable deleterious effects on its host. These findings suggest that the Wolbachia infection behaves like a neutral variant in populations. The infection may represent an evolutionary outcome of interactions between Wolbachia infections and their hosts.
Insights
A novel Wolbachia infection in Drosophila simulans lacks cytoplasmic incompatibility, spreading neutrally via maternal transmission. This discovery offers insights into the evolutionary dynamics of host-microbe interactions.
Area of Science:
- Microbiology and Evolutionary Biology
- Insect-microbe interactions
Background:
- Wolbachia are intracellular bacteria transmitted maternally in insects.
- Many Wolbachia strains induce cytoplasmic incompatibility, driving their spread in host populations.
- Drosophila simulans is a well-studied model for Wolbachia-host dynamics.
Purpose of the Study:
- To characterize a newly identified Wolbachia infection in Drosophila simulans.
- To determine if this specific infection induces cytoplasmic incompatibility.
- To investigate the transmission dynamics and population frequency of this novel Wolbachia strain.
Main Methods:
- Field collection of Drosophila simulans from eastern Australia.
- Molecular identification and characterization of Wolbachia infection.
- Assessing cytoplasmic incompatibility through controlled crosses.
- Monitoring maternal transmission efficiency and host fitness effects.
Main Results:
- A novel Wolbachia infection was identified in Drosophila simulans populations.
- This infection does not induce cytoplasmic incompatibility, a property of the bacteria itself.
- The infection exhibits perfect maternal transmission and occurs at low frequencies without apparent negative effects on host fitness.
Conclusions:
- This Wolbachia infection functions as a neutral genetic variant within the host population.
- The findings suggest an evolutionary outcome of host-microbe interactions, diverging from typical CI-driven spread.
- Further research is needed to understand the long-term evolutionary implications of such neutral Wolbachia infections.