Evolution of Photosynthetic Eukaryotes; Current Opinion, Perplexity, and a New Perspective

Maruyama, Shinichiro; Kim, Eun-Soo

doi:10.1007/978-3-030-51849-3_12

Cited by 3 publications

(1 citation statement)

References 48 publications

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“…Chlorophyte and land plant RuBisCO homologs are nested among cyanobacterial sequences within the Form IB clade. The Form IB topology therefore recapitulates a primary plastid endosymbiotic history from cyanobacterial to Chlorophyte ancestors (43)(44)(45) and constrains the minimum age of ancestral Form IB to older than the Archaeplastida. As a conservative estimate, AncIB is thus likely older than ~1 Ga (the age of the oldest well-characterized, crown-group red and green algal fossils (16,46)) and younger than maximum age estimates of cyanobacteria (~3 Ga, asconstrained by oxidized sediments potentially indicating the early presence of oxygenic photosynthesis (47,48)).…”

Section: Resultsmentioning

confidence: 79%

Resurrected Rubisco suggests uniform carbon isotope signatures over geologic time

Kędzior

et al. 2021

Preprint

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Uniformitarian assumptions underlie the oldest evidence for living organisms on Earth, the distinct isotope fractionation between inorganic and organic carbon. Aside from a handful of compelling deviations, the 13C/12C isotopic mean of preserved organic carbon (δ13Corg) has remained remarkably unchanged through time. RuBisCO is the principal carboxylase/oxygenase biomolecular component that is thought to primarily account for the generation of these distinct carbon isotopic signals. However, it is difficult to reconcile a mostly unchanging mean δ13Corg with several known factors that can affect the isotope fractionation of RuBisCO, such as atmospheric composition and the amino acid composition of the enzyme itself, which have each changed markedly over Earth history. Here we report the resurrection and genetic incorporation of a Precambrian-age, Form IB RuBisCO in a modern cyanobacterial host. The isotopic composition of biomass relative to CO2 (ϵp) in ancestral and control strains were much greater when grown under Precambrian CO2 concentrations compared to modern ambient levels, but displaying values within a nominal envelope of modern-day RuBisCO IB enzyme variants. We infer that these isotopic differences derive indirectly from the decreased fitness of the AncIB strain, which includes diminished growth capacity and total cell RuBisCO activity. We argue that to answer the greatest questions of deep-time paleobiology, ancient biogeochemical signals should be reproduced in the laboratory through the synthesis of the geologic record with experimentally-derived constraints on underlying ancient molecular biology.

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Section: Resultsmentioning

confidence: 79%

Resurrected Rubisco suggests uniform carbon isotope signatures over geologic time

Kędzior

et al. 2021

Preprint

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Beyond being an energy supplier, ATP synthase is a sculptor of mitochondrial cristae

Miranda-Astudillo

Ostolga-Chavarría

Cardol

et al. 2022

Biochimica et Biophysica Acta (BBA) - Bioenergetics

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Evolutionary rates of nuclear and organellar genomes are linked in land plants

Asar,

Sauquet,

2024

Preprint

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Plants carry genetic material in three separate compartments, the nuclear, mitochondrial, and chloroplast genomes. These genomes interact with each other to various degrees and are subject to shared evolutionary drivers exerted by their host organisms. Although animal mitochondrial and nuclear genomes display linked evolutionary rates, a well-documented phenomenon termed “mito-nuclear covariation”, it is not clear whether the three plant genomes display covarying evolutionary signals on a broad scale. We tested for correlated evolutionary rates between nuclear and organellar genomes using extensive data sets from the major clades of land plants (Embryophyta), including mosses, ferns, gymnosperms, and angiosperms. To examine the evolutionary dynamics in parasitic angiosperms, which are under distinctive selective pressures, we also analysed data sets from mistletoes, broomrapes, sandalwoods, and rafflesias. Evolutionary rates of nuclear and organellar genomes were positively linked in each group of land plants tested, except in the parasitic angiosperms. We also found positive correlations between rates of nonsynonymous and synonymous change. Our results reveal extensive evolutionary rate variation across land plant taxa, particularly in mitochondrial genomes in angiosperms. Overall, we find that nuclear, mitochondrial, and chloroplast genomes in land plants share similar drivers of mutation rates, despite considerable variation in life history, morphology, and genome sizes among clades. Our findings lay the foundation for further exploration of the impact of co-evolutionary interactions on shared evolutionary rates between genomes.

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Evolution of Photosynthetic Eukaryotes; Current Opinion, Perplexity, and a New Perspective

Cited by 3 publications

References 48 publications

Resurrected Rubisco suggests uniform carbon isotope signatures over geologic time

Resurrected Rubisco suggests uniform carbon isotope signatures over geologic time

Beyond being an energy supplier, ATP synthase is a sculptor of mitochondrial cristae

Evolutionary rates of nuclear and organellar genomes are linked in land plants

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