Evidence map›Paper›PMID 23258841›Full record

ArticleGenome biology and evolution2013

Chlorophyll biosynthesis gene evolution indicates photosystem gene duplication, not photosystem merger, at the origin of oxygenic photosynthesis.

Filipa L Sousa, Liat Shavit-Grievink, John F Allen, William F Martin

Open access · goldAbstract read
In one paragraph

Article in Genome biology and evolution, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 41 papers.

0numbers the graph read from it
0cells of the map it votes in
41citing papers in PubMed
2.4field-weighted citation impact, top 11% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

41 citing papers in PubMed, 107 citations in OpenAlex.

  1. Article
  2. Mid-day photomixotrophy byApplied and environmental microbiology · 2025
    Article
  3. Illuminating the coevolution of photosynthesis and Bacteria.Proceedings of the National Academy of Sciences of the United States of America · 2024
    Article
  4. Light dependent protochlorophyllide oxidoreductase: a succinct look.Physiology and molecular biology of plants : an international journal of functional plant biology · 2024
    Review
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  13. Time-resolved comparative molecular evolution of oxygenic photosynthesis.Biochimica et biophysica acta. Bioenergetics · 2021
    Article
  14. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 2 institutions in 3 countries.

Filipa L SousaInstitute of Molecular Evolution, University of Düsseldorf, Düsseldorf, Germany. Filipa.Sousa@hhu.de
Liat Shavit-Grievink
John F Allen
William F Martin
Heinrich Heine University Düsseldorf · DEUniversity College London · GB

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

An open question regarding the evolution of photosynthesis is how cyanobacteria came to possess the two reaction center (RC) types, Type I reaction center (RCI) and Type II reaction center (RCII). The two main competing theories in the foreground of current thinking on this issue are that either 1) RCI and RCII are related via lineage divergence among anoxygenic photosynthetic bacteria and became merged in cyanobacteria via an event of large-scale lateral gene transfer (also called "fusion" theories) or 2) the two RC types are related via gene duplication in an ancestral, anoxygenic but protocyanobacterial phototroph that possessed both RC types before making the transition to using water as an electron donor. To distinguish between these possibilities, we studied the evolution of the core (bacterio)chlorophyll biosynthetic pathway from protoporphyrin IX (Proto IX) up to (bacterio)chlorophyllide a. The results show no dichotomy of chlorophyll biosynthesis genes into RCI- and RCII-specific chlorophyll biosynthetic clades, thereby excluding models of fusion at the origin of cyanobacteria and supporting the selective-loss hypothesis. By considering the cofactor demands of the pathway and the source genes from which several steps in chlorophyll biosynthesis are derived, we infer that the cell that first synthesized chlorophyll was a cobalamin-dependent, heme-synthesizing, diazotrophic anaerobe.

Indexed as

Evolution, MolecularGene DuplicationBacterial ProteinsBacteriochlorophyllsChlorophyllidesCyanobacteriaPhotosynthesisPhotosystem II Protein ComplexPhotosystem I Protein ComplexPhylogenyProtoporphyrinsBacterial ProteinsBacteriochlorophyllsChlorophyllidesPhotosystem II Protein ComplexPhotosystem I Protein Complexprotoporphyrin IXProtoporphyrins

Identifiers

PMID23258841
PMCPMC3595025
OpenAlexW2107915883

What OpenQuestion holds

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LicenceCC BY-NC
Read underepoch 390

Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.