Evidence map›Paper›PMID 18032728›Full record

ArticleGenome research2008

Large-scale comparative analysis of splicing signals and their corresponding splicing factors in eukaryotes.

Schraga H Schwartz, João Silva, David Burstein, Tal Pupko, Eduardo Eyras, Gil Ast

Open access · bronzeAbstract readComparative Study
In one paragraph

Article in Genome research, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 102 papers.

0numbers the graph read from it
0cells of the map it votes in
102citing 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

102 citing papers in PubMed, 185 citations in OpenAlex.

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  14. Interplays betweenInternational journal of molecular sciences · 2023
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  17. Article
  18. Article
  19. Article
  20. Review

42 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

6 authors at 3 institutions in 2 countries.

Schraga H SchwartzDepartment of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine, Tel-Aviv University, Ramat Aviv 69978, Israel.
João Silva
David Burstein
Tal Pupko
Eduardo Eyras
Gil Ast
Tel Aviv University · ILInstitució Catalana de Recerca i Estudis Avançats · ESUniversitat Pompeu Fabra · ES

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Introns are among the hallmarks of eukaryotic genes. Splicing of introns is directed by three main splicing signals: the 5' splice site (5'ss), the branch site (BS), and the polypyrimdine tract/3'splice site (PPT-3'ss). To study the evolution of these splicing signals, we have conducted a systematic comparative analysis of these signals in over 1.2 million introns from 22 eukaryotes. Our analyses suggest that all these signals have dramatically evolved: The PPT is weak among most fungi, intermediate in plants and protozoans, and strongest in metazoans. Within metazoans it shows a gradual strengthening from Caenorhabditis elegans to human. The 5'ss and the BS were found to be degenerate among most organisms, but highly conserved among some fungi. A maximum parsimony-based algorithm for reconstructing ancestral position-specific scoring matrices suggested that the ancestral 5'ss and BS were degenerate, as in metazoans. To shed light on the evolutionary variation in splicing signals, we have analyzed the evolutionary changes in the factors that bind these signals. Our analysis reveals coevolution of splicing signals and their corresponding splicing factors: The strength of the PPT is correlated to changes in key residues in its corresponding splicing factor U2AF2; limited correlation was found between changes in the 5'ss and U1 snRNA that binds it; but not between the BS and U2 snRNA. Thus, although the basic ability of eukaryotes to splice introns has remained conserved throughout evolution, the splicing signals and their corresponding splicing factors have considerably evolved, uniquely shaping the splicing mechanisms of different organisms.

Indexed as

Evolution, MolecularAnimalsDatabases, GeneticEukaryotic CellsGenomeHumansNuclear ProteinsRibonucleoproteinsRNA-Binding ProteinsRNA, Small NuclearRNA Splice SitesSplicing Factor U2AFNuclear ProteinsRibonucleoproteinsRNA-Binding ProteinsRNA, Small NuclearRNA Splice SitesSplicing Factor U2AFU1 small nuclear RNAU2AF2 protein, human

Identifiers

PMID18032728
PMCPMC2134773
OpenAlexW2107977824

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.