Evidence map›Paper›PMID 22267485›Full record

ArticleThe Plant cell2012

The primary transcriptome of barley chloroplasts: numerous noncoding RNAs and the dominating role of the plastid-encoded RNA polymerase.

Petya Zhelyazkova, Cynthia M Sharma, Konrad U Förstner, Karsten Liere, Jörg Vogel, Thomas Börner

Open access · hybridAbstract read
In one paragraph

Article in The Plant cell, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 136 papers.

0numbers the graph read from it
0cells of the map it votes in
136citing papers in PubMed
9.5field-weighted citation impact, top 1% 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

136 citing papers in PubMed, 275 citations in OpenAlex.

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  16. Regreening mechanisms in cucumber: insights from a CsSIG2 mutation affecting chloroplast development.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2025
    Article
  17. Article
  18. Comparative chloroplast genome analyses ofFrontiers in plant science · 2025
    Article
  19. Comparative analyses of chloroplast genomes inFrontiers in plant science · 2025
    Article
  20. Article

76 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

6 authors at 2 institutions in 2 countries.

Petya ZhelyazkovaInstitute for Biology (Genetics), Humboldt-University Berlin, D-10115 Berlin, Germany.
Cynthia M Sharma
Konrad U Förstner
Karsten Liere
Jörg Vogel
Thomas Börner
Humboldt State University · USUniversity of Würzburg · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Gene expression in plastids of higher plants is dependent on two different transcription machineries, a plastid-encoded bacterial-type RNA polymerase (PEP) and a nuclear-encoded phage-type RNA polymerase (NEP), which recognize distinct types of promoters. The division of labor between PEP and NEP during plastid development and in mature chloroplasts is unclear due to a lack of comprehensive information on promoter usage. Here, we present a thorough investigation into the distribution of PEP and NEP promoters within the plastid genome of barley (Hordeum vulgare). Using a novel differential RNA sequencing approach, which discriminates between primary and processed transcripts, we obtained a genome-wide map of transcription start sites in plastids of mature first leaves. PEP-lacking plastids of the albostrians mutant allowed for the unambiguous identification of NEP promoters. We observed that the chloroplast genome contains many more promoters than genes. According to our data, most genes (including genes coding for photosynthesis proteins) have both PEP and NEP promoters. We also detected numerous transcription start sites within operons, indicating transcriptional uncoupling of genes in polycistronic gene clusters. Moreover, we mapped many transcription start sites in intergenic regions and opposite to annotated genes, demonstrating the existence of numerous noncoding RNA candidates.

Indexed as

ChloroplastsDNA-Directed RNA PolymerasesGene Expression Regulation, PlantHordeumPlant ProteinsPlastidsRNA, UntranslatedTranscriptomeDNA-Directed RNA PolymerasesPlant ProteinsRNA, Untranslated

Identifiers

PMID22267485
PMCPMC3289561
OpenAlexW2155542657

What OpenQuestion holds

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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.