Elevated Rate of Genome Rearrangements in Radiation-Resistant Bacteria
Jelena Repar1,2,3, Fran Supek4,5,6, Tin Klanjscek7
1Division of Molecular Biology, Ruder Boskovic Institute, 10000 Zagreb, Croatia jelena.repar@irb.hr.
Genetics
|February 12, 2017
Summary
Radiation-resistant bacteria exhibit higher rates of genome rearrangements, challenging the idea that DNA repair mechanisms stabilize gene order. DNA damage and repair paradoxically increase genome instability in these species.
Area of Science:
- Microbiology
- Genomics
- Evolutionary Biology
Background:
- Radiation resistance in bacteria, archaea, and eukaryotes is linked to DNA double-strand break repair.
- Efficient DNA repair is hypothesized to stabilize genome structure against environmental DNA damage.
- This stabilization is expected to lead to conserved gene order in radiation-resistant species.
Purpose of the Study:
- To investigate the relationship between radiation resistance and genome rearrangement rates in bacteria.
- To determine if radiation resistance is associated with genome structure stabilization.
- To explore the mechanisms driving genome rearrangements in radiation-resistant bacteria.
Main Methods:
- Comparative analysis of gene order conservation across multiple bacterial groups.
- Phylogenetic matching of radiation-resistant and nonresistant species.
- Examination of genome rearrangement mechanisms, including symmetrical inversions.
Main Results:
- Radiation-resistant bacterial species show higher rates of genome rearrangements compared to nonresistant counterparts.
- This finding was consistent across multiple, independent bacterial lineages.
- Mechanisms like symmetrical inversions around the origin of replication influence genome structure in both resistant and nonresistant bacteria.
Conclusions:
- Contrary to expectations, radiation resistance is associated with increased genome instability in bacteria.
- The interplay between DNA damage and repair mechanisms leads to elevated genome rearrangement rates.
- Genome structure tolerance is not a strategy for radiation resistance.
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