Large Mitochondrial Genome of Chlorokybus atmophyticus
Author Information
Author(s): Monique Turmel, Christian Otis, Claude Lemieux
Primary Institution: Département de biochimie et de microbiologie, Université Laval, Québec, QC, Canada
Hypothesis
What is the nature of the mitochondrial genome in the last common ancestor of all streptophytes?
Conclusion
The study reveals that the mitochondrial genome of Chlorokybus is significantly larger and more loosely packed than that of Mesostigma, challenging previous assumptions about mitochondrial genome compactness in charophycean green algae.
Supporting Evidence
- The Chlorokybus mitochondrial genome is 201,763 bp, making it the largest mtDNA reported for a green alga.
- It contains 70 conserved genes, representing 41.4% of the genome sequence.
- The study identified two genes, nad10 and trnL(gag), for the first time in streptophyte mtDNA.
- Chlorokybus mtDNA has a higher intron content than its Mesostigma and Chaetosphaeridium counterparts.
- Repeated elements account for 7.5% of the Chlorokybus genome.
Takeaway
This study found that the mitochondrial DNA of a green alga called Chlorokybus is much bigger and less tightly packed than that of another alga, Mesostigma, which changes how we think about the evolution of these genomes.
Methodology
The mitochondrial DNA of Chlorokybus atmophyticus was sequenced and compared with those of other charophycean green algae and bryophytes.
Digital Object Identifier (DOI)
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