Evidence map›Paper›PMID 19840382›Full record

ArticleBMC genomics2009

Widespread variation in transcript abundance within and across developmental stages of Trypanosoma brucei.

Bryan C Jensen, Dhileep Sivam, Charles T Kifer, Peter J Myler, Marilyn Parsons

Open access · goldAbstract readComparative Study
In one paragraph

Article in BMC genomics, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 91 papers.

0numbers the graph read from it
0cells of the map it votes in
91citing papers in PubMed
10.0field-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

91 citing papers in PubMed, 141 citations in OpenAlex.

  1. A factor integrating transcription and repression of surface antigen genes in African trypanosomes.Proceedings of the National Academy of Sciences of the United States of America · 2026
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  5. Subcellular protein localisation ofWellcome open research · 2023
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31 more citing papers are in PubMed but not listed here.

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

5 authors at 3 institutions in 1 country.

Bryan C JensenSeattle Biomedical Research Institute, 307 Westlake Ave. North, Seattle, WA 98109, USA. bryan.jensen@sbri.org
Dhileep Sivam
Charles T Kifer
Peter J Myler
Marilyn Parsons
Center for Infectious Disease Research · USNorth Seattle College · USUniversity of Washington · US

Funding

TYROSINE KINASE OF TRYPANOSOMA BRUCEIR01AI031077 · NIAID · SEATTLE BIOMEDICAL RESEARCH INSTITUTE · PI PARSONS, MARILYN · 1992 to 2010
$3.6M
Transcription of Protein-coding Genes in LeishmaniaR01AI053667 · NIAID · SEATTLE BIOMEDICAL RESEARCH INSTITUTE · PI MYLER, PETER JOHN · 2003 to 2010
$2.8M
NIAID NIH HHS R01 AI031077NIAID NIH HHS R01 AI053667NIAID NIH HHS R01 AI31077
6 · The paper itself

Abstract

backgroundTrypanosoma brucei, the causative agent of African sleeping sickness, undergoes a complex developmental cycle that takes place in mammalian and insect hosts and is accompanied by changes in metabolism and cellular morphology. While differences in mRNA expression have been described for many genes, genome-wide expression analyses have been largely lacking. Trypanosomatids represent a unique case in eukaryotes in that they transcribe protein-coding genes as large polycistronic units, and rarely regulate gene expression at the level of transcription initiation.

resultsHere we present a comprehensive analysis of mRNA expression in several stages of parasite development. Utilizing microarrays that have multiple copies of multiple probes for each gene, we were able to demonstrate with a high degree of statistical confidence that approximately one-fourth of genes show differences in mRNA expression levels in the stages examined. These include complex patterns of gene expression within gene families, including the large family of variant surface glycoproteins (VSGs) and their relatives, where we have identified a number of constitutively expressed family members. Furthermore, we were able to assess the relative abundance of all transcripts in each stage, identifying the genes that are either weakly or highly expressed. Very few genes show no evidence of expression.

conclusionDespite the lack of gene regulation at the level of transcription initiation, our results reveal extensive regulation of mRNA abundance associated with different life cycle and growth stages. In addition, analysis of variant surface glycoprotein gene expression reveals a more complex picture than previously thought. These data provide a valuable resource to the community of researchers studying this lethal agent.

Indexed as

Gene Expression ProfilingGenome, ProtozoanAnimalsCluster AnalysisGene Expression Regulation, DevelopmentalOligonucleotide Array Sequence AnalysisRatsRats, WistarRNA, MessengerRNA, ProtozoanTrypanosoma brucei bruceiVariant Surface Glycoproteins, TrypanosomaRNA, MessengerRNA, ProtozoanVariant Surface Glycoproteins, Trypanosoma

Identifiers

PMID19840382
PMCPMC2771046
OpenAlexW1995867836

What OpenQuestion holds

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LicenceCC BY
Read underepoch 390

Registered trials

None linked

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.