Positive Selection in Radiation-Resistant Bacteria
Author Information
Author(s): Sghaier Haïtham, Ghedira Kaïs, Benkahla Alia, Barkallah Insaf
Primary Institution: National Center for Nuclear Sciences and Technologies (CNSTN)
Hypothesis
What is the role of positive Darwinian selection in the evolution of resistance to ionizing radiation and tolerance of desiccation in ionizing-radiation-resistant bacteria?
Conclusion
The study identifies genes under positive selection that may contribute to the resistance of certain bacteria to ionizing radiation and desiccation.
Supporting Evidence
- 689 ortholog sets in ionizing-radiation-resistant bacteria were identified as potentially under positive selection.
- All basal DNA repair genes in ionizing-radiation-resistant bacteria are subject to positive selection.
- Positive selection was detected using the DnaSP program, which calculates mutation rates.
Takeaway
Some bacteria can survive extreme radiation and dryness because they have special genes that help them fix their DNA when it gets damaged.
Methodology
The study analyzed genome sequences of four ionizing-radiation-resistant bacteria to identify genes under positive selection using software tools.
Limitations
The bioinformatics method used may include false positives due to improper sequence alignments.
Digital Object Identifier (DOI)
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