An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids
The phylum Cyanobacteria includes free-living bacteria and plastids, the descendants of cyanobacteria that were engulfed by the ancestral lineage of the major photosynthetic eukaryotic group Archaeplastida. Endosymbiotic events that followed this primary endosymbiosis spread plastids across diverse...
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| Format: | Article |
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Frontiers Media SA
2020
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| Online Access: | https://hdl.handle.net/1721.1/125125 |
| _version_ | 1826204257365262336 |
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| author | Moore, Kelsey R. Magnabosco, Cara Momper, Lily Gold, David A. Bosak, Tanja Fournier, Gregory P. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Moore, Kelsey R. Magnabosco, Cara Momper, Lily Gold, David A. Bosak, Tanja Fournier, Gregory P. |
| author_sort | Moore, Kelsey R. |
| collection | MIT |
| description | The phylum Cyanobacteria includes free-living bacteria and plastids, the descendants of cyanobacteria that were engulfed by the ancestral lineage of the major photosynthetic eukaryotic group Archaeplastida. Endosymbiotic events that followed this primary endosymbiosis spread plastids across diverse eukaryotic groups. The remnants of the ancestral cyanobacterial genome present in all modern plastids, enable the placement of plastids within Cyanobacteria using sequence-based phylogenetic analyses. To date, such phylogenetic studies have produced conflicting results and two competing hypotheses: (1) plastids diverge relatively recently in cyanobacterial evolution and are most closely related to nitrogen-fixing cyanobacteria, or (2) plastids diverge early in the evolutionary history of cyanobacteria, before the divergence of most cyanobacterial lineages. Here, we use phylogenetic analysis of ribosomal proteins from an expanded data set of cyanobacterial and representative plastid genomes to infer a deep placement for the divergence of the plastid ancestor lineage. We recover plastids as sister to Gloeomargarita and show that the group diverges from other cyanobacterial groups before Pseudanabaena, a previously unreported placement. The tree topologies and phylogenetic distances in our study have implications for future molecular clock studies that aim to model accurate divergence times, especially with respect to groups containing fossil calibrations. The newly sequenced cyanobacterial groups included here will also enable the use of novel cyanobacterial microfossil calibrations. |
| first_indexed | 2024-09-23T12:51:26Z |
| format | Article |
| id | mit-1721.1/125125 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:51:26Z |
| publishDate | 2020 |
| publisher | Frontiers Media SA |
| record_format | dspace |
| spelling | mit-1721.1/1251252022-10-01T11:34:52Z An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids Moore, Kelsey R. Magnabosco, Cara Momper, Lily Gold, David A. Bosak, Tanja Fournier, Gregory P. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences The phylum Cyanobacteria includes free-living bacteria and plastids, the descendants of cyanobacteria that were engulfed by the ancestral lineage of the major photosynthetic eukaryotic group Archaeplastida. Endosymbiotic events that followed this primary endosymbiosis spread plastids across diverse eukaryotic groups. The remnants of the ancestral cyanobacterial genome present in all modern plastids, enable the placement of plastids within Cyanobacteria using sequence-based phylogenetic analyses. To date, such phylogenetic studies have produced conflicting results and two competing hypotheses: (1) plastids diverge relatively recently in cyanobacterial evolution and are most closely related to nitrogen-fixing cyanobacteria, or (2) plastids diverge early in the evolutionary history of cyanobacteria, before the divergence of most cyanobacterial lineages. Here, we use phylogenetic analysis of ribosomal proteins from an expanded data set of cyanobacterial and representative plastid genomes to infer a deep placement for the divergence of the plastid ancestor lineage. We recover plastids as sister to Gloeomargarita and show that the group diverges from other cyanobacterial groups before Pseudanabaena, a previously unreported placement. The tree topologies and phylogenetic distances in our study have implications for future molecular clock studies that aim to model accurate divergence times, especially with respect to groups containing fossil calibrations. The newly sequenced cyanobacterial groups included here will also enable the use of novel cyanobacterial microfossil calibrations. Simons Foundation (Grant 344707) Simons Foundation (Grant 339603) Simons Foundation (Grant 327126) 2020-05-07T20:53:20Z 2020-05-07T20:53:20Z 2019-07 2019-01 Article http://purl.org/eprint/type/JournalArticle 1664-302X https://hdl.handle.net/1721.1/125125 Moore, Kelsey R. et al. "An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids." Frontiers in Microbiology 10 (July 2019): 1612 http://dx.doi.org/10.3389/fmicb.2019.01612 Frontiers in Microbiology Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Frontiers Media SA Frontiers |
| spellingShingle | Moore, Kelsey R. Magnabosco, Cara Momper, Lily Gold, David A. Bosak, Tanja Fournier, Gregory P. An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids |
| title | An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids |
| title_full | An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids |
| title_fullStr | An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids |
| title_full_unstemmed | An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids |
| title_short | An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids |
| title_sort | expanded ribosomal phylogeny of cyanobacteria supports a deep placement of plastids |
| url | https://hdl.handle.net/1721.1/125125 |
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