The smallest angiosperm genomes may be the price for effective traps of bladderworts
Author Information
Author(s): Zedek František, Šmerda Jakub, Halasová Aneta, Adamec Lubomír, Veleba Adam, Plačková Klára, Bureš Petr
Primary Institution: Masaryk University
Hypothesis
The minute genomes of carnivorous plants in the Lentibulariaceae family result from a unique mitochondrial cytochrome c oxidase (COX) mutation that boosts mitochondrial efficiency but also increases DNA-damaging reactive oxygen species.
Conclusion
The COX mutation in Lentibulariaceae is associated with genome downsizing, likely due to increased reactive oxygen species production leading to DNA damage.
Supporting Evidence
- Species with the ancestral COX sequence exhibited larger genomes and chromosomes than those with the novel mutation.
- Statistical analyses confirmed a directional evolution towards smaller genomes in species harboring COX mutations.
- The COX mutation increases mitochondrial energy output but compromises genome integrity.
Takeaway
Some plants have tiny genomes because a special mutation helps them catch food better, but it also makes their DNA more likely to get damaged.
Methodology
The study measured genome and mean chromosome sizes for 127 species and analyzed COX sequences to detect mutations, using phylogenetic regressions and Ornstein–Uhlenbeck models.
Potential Biases
Potential bias exists in assigning mutations to species lacking COX sequence data.
Limitations
The analysis included species with inferred COX sequence status, which may introduce bias.
Participant Demographics
The study included 127 species from the Lentibulariaceae family, representing all three genera: Genlisea, Pinguicula, and Utricularia.
Statistical Information
P-Value
p<<0.001
Statistical Significance
p<<0.001
Digital Object Identifier (DOI)
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