Evidence map›Paper›PMID 15173109›Full record

ArticleGenome research2004

The small chromosomes of Trypanosoma brucei involved in antigenic variation are constructed around repetitive palindromes.

Bill Wickstead, Klaus Ersfeld, Keith Gull

Open access · bronzeAbstract read
In one paragraph

Article in Genome research, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 63 papers.

0numbers the graph read from it
0cells of the map it votes in
63citing papers in PubMed
–field-weighted citation impact
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

63 citing papers in PubMed, 120 citations in OpenAlex.

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  18. DNA Double-Strand Breaks: A Double-Edged Sword for Trypanosomatids.Frontiers in cell and developmental biology · 2021
    Review
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  20. Review

3 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

3 authors at 2 institutions in 1 country.

Bill WicksteadSir William Dunn School of Pathology, University of Oxford, Oxford, OX1 3RE, United Kingdom.
Klaus Ersfeld
Keith Gull
University of Manchester · GBUniversity of Oxford · GB

Funding

Wellcome Trust
6 · The paper itself

Abstract

Most eukaryotic genomes contain large regions of satellite DNA. These arrays are often associated with essential chromosomal functions, but remain largely absent from genome projects because of difficulties in cloning and sequence assembly. The numerous small chromosomes of the parasite Trypanosoma brucei fall into this category, yet are critical to understanding the genome because of their role in antigenic variation. Their relatively small size, however, makes them particularly amenable to physical mapping. We have produced fine-resolution maps of 17 complete minichromosomes and partial maps of two larger intermediate-sized chromosomes. This revealed a canonical structure shared by both chromosomal classes based around a large central core of 177-bp repeats. Around the core are variable-length genic regions, the lengths of which define chromosomal class. We show the core region to be a repetitive palindrome with a single inversion point common to all the chromosomes of both classes, suggesting a mechanism of genesis for these chromosomes. Moreover, palindromy appears to be a feature of (peri)centromeres in other species that can be easily overlooked. We propose that sequence inversion is one of the higher-order sequence motifs that confer chromosomal stability.

Indexed as

AnimalsAntigenic VariationBase CompositionBase SequenceCell Line, TransformedChromosome MappingChromosomesChromosomes, Artificial, BacterialDatabases, GeneticGene DuplicationMolecular Sequence DataRepetitive Sequences, Nucleic AcidTrypanosoma brucei brucei

Identifiers

PMID15173109
PMCPMC419779
OpenAlexW2144924990

What OpenQuestion holds

Textmetadata
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.