Evidence map›Paper›PMID 7666450›Full record

ArticleJournal of molecular evolution1995

Analyses of ribosomal RNA sequences from glaucocystophyte cyanelles provide new insights into the evolutionary relationships of plastids.

T A Helmchen, D Bhattacharya, M Melkonian

Abstract read
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In one paragraph

Article in Journal of molecular evolution, 1995. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.

0numbers the graph read from it
0cells of the map it votes in
12citing papers in PubMed
2.4field-weighted citation impact, top 10% 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

12 citing papers in PubMed, 77 citations in OpenAlex.

  1. Article
  2. Article
  3. The endosymbiotic origin, diversification and fate of plastids.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2010
    Review
  4. Article
  5. Article
  6. Article
  7. Article
  8. Genomes at the interface between bacteria and organelles.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2003
    Review
  9. The single, ancient origin of chromist plastids.Proceedings of the National Academy of Sciences of the United States of America · 2002
    Article
  10. The origin of red algae: implications for plastid evolution.Proceedings of the National Academy of Sciences of the United States of America · 1997
    Article
  11. Article
  12. Article
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

3 authors at 1 institution in 1 country.

T A HelmchenBotanisches Institut, Lehrstuhl I Universität zu Köln, Germany.
D Bhattacharya
M Melkonian
University of Cologne · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Glaucocystophyte algae (sensu Kies, Berl. Deutsch. Bot. Ges. 92, 1979) contain plastids (cyanelles) that retain the peptidoglycan wall of the putative cyano-bacterial endosymbiont; this and other ultrastructural characters (e.g., unstacked thylakoids, phycobilisomes) have suggested that cyanelles are "primitive" plastids that may represent undeveloped associations between heterotrophic "host" cells (i.e., glaucocystophytes) and cyanobacteria. To test the monophyly of glaucocystophyte cyanelles and to determine their evolutionary relationship to other plastids, complete 16S ribosomal RNA sequences were determined for Cyanophora paradoxa, Glaucocystis nostochinearum, Glaucosphaera vacuolata, and Gloeochaete wittrockiana. Plastid rRNAs were analyzed with the maximum-likelihood, maximum-parsimony, and neighbor-joining methods. The phylogenetic analyses show that the cyanelles of C. paradoxa, G. nostochinearum, and G. wittrockiana form a distinct evolutionary lineage; these cyanelles presumably share a monophyletic origin. The rDNA sequence of G. vacuolata was positioned within the nongreen plastid lineage. This result is consistent with analyses of nuclear-encoded rRNAs that identify G. vacuolata as a rhodophyte and support is removal from the Glaucocystophyta. Results of a global search with the maximum-likelihood method suggest that cyanelles are the first divergence among all plastids; this result is consistent with a single loss of the peptidoglycan wall in plastids after the divergence of the cyanelles. User-defined tree analyses with the maximum-likelihood method indicate, however, that the position of the cyanelles is not stable within the rRNA phylogenies. Both maximum-parsimony and neighbor-joining analyses showed a close evolutionary relationship between cyanelles and non-green plastids; these phylogenetic methods were sensitive to inclusion/exclusion of the G. wittrockiana cyanelle sequence.(ABSTRACT TRUNCATED AT 250 WORDS)

Indexed as

PhylogenyBase SequenceDNA, RibosomalEukaryotaMolecular Sequence DataPhycobilisomesPlastidsRNA, Ribosomal, 16SSequence Analysis, DNADNA, RibosomalPhycobilisomesRNA, Ribosomal, 16S

Identifiers

PMID7666450
OpenAlexW2016604613

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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.