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- W2462096700 abstract "The volvocine lineage is a monophyletic grouping of unicellular, colonial and multicellular algae, and a model for studying the evolution of multicellularity. In addition to being morphologically diverse, volvocine algae boast a surprising amount of organelle genomic variation. Moreover, volvocine organelle genome complexity appears to scale positively with organismal complexity. However, the organelle DNA architecture at the origin of colonial living is not known. To examine this issue, we sequenced the plastid and mitochondrial DNAs (ptDNA and mtDNA) of the 4-celled alga Tetrabaena socialis, which is basal to the colonial and multicellular volvocines.Tetrabaena socialis has a circular-mapping mitochondrial genome, contrasting with the linear mtDNA architecture of its relative Chlamydomonas reinhardtii. This suggests that a circular-mapping mtDNA conformation emerged at or near the transition to group living in the volvocines, or represents the ancestral state of the lineage as a whole. The T. socialis ptDNA is very large (>405 kb) and dense with repeats, supporting the idea that a shift from a unicellular to a colonial existence coincided with organelle genomic expansion, potentially as a result of increased random genetic drift. These data reinforce the idea that volvocine algae harbour some of the most expanded plastid chromosomes from the eukaryotic tree of life. Circular-mapping mtDNAs are turning out to be more common within volvocines than originally thought, particularly for colonial and multicellular species. Altogether, volvocine organelle genomes became markedly more inflated during the evolution of multicellularity, but complex organelle genomes appear to have existed at the very beginning of colonial living." @default.
- W2462096700 created "2016-07-22" @default.
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- W2462096700 date "2016-07-01" @default.
- W2462096700 modified "2023-10-18" @default.
- W2462096700 title "Inflated organelle genomes and a circular-mapping mtDNA probably existed at the origin of coloniality in volvocine green algae" @default.
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- W2462096700 doi "https://doi.org/10.1080/09670262.2016.1198830" @default.
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