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Evolution of the unspliced transcriptome.

Jan Engelhardt1, Peter F Stadler2,3,4,5,6,7

  • 1Bioinformatics Group, Department of Computer Science, and Interdisciplinary Center for Bioinformatics, University of Leipzig, Haertelstraße 16-18, Leipzig, D-04107, Germany. jane@bioinf.uni-leipzig.de.

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This summary is machine-generated.

Unspliced non-coding RNAs are abundant and rapidly evolving mammalian transcripts. Analysis of EST data reveals their genomic distribution, conservation, and tissue-specific expression, offering insights into epigenetic regulation.

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Area of Science:

  • Genomics
  • Transcriptomics
  • Molecular Biology

Background:

  • Unspliced non-coding RNAs are abundant but understudied.
  • Little is known about their genomic distribution, relationship to spliced products, or evolution.

Purpose of the Study:

  • To systematically investigate unspliced transcripts using EST data in humans and mice.
  • To determine their genomic distribution, conservation, evolution, and expression patterns.

Main Methods:

  • Analysis of human and mouse EST annotation tracks.
  • Utilized CAGE tag and chromatin data for validation.
  • Comparative analysis of spliced and unspliced transcripts.

Main Results:

  • Identified over 100,000 unspliced EST clusters in humans and 60,000 in mice.
  • Found one-third located within introns (TINs), one-third overlapping exons (PINs), and 11% intergenic.
  • Predicted over 2000 3'UTR-associated RNA candidates per species.
  • Observed 15-20% conservation between humans and mice.
  • Demonstrated slower sequence evolution compared to genomic background (except TINs).
  • Revealed highly tissue-specific expression patterns, similar to spliced long non-coding RNAs.

Conclusions:

  • Unspliced non-coding RNAs are a significant, evolving part of mammalian transcriptomes.
  • Their analysis is challenging due to association with complex loci.
  • EST data provide crucial insights into this under-investigated transcriptome component.
  • Potential roles in chromatin organization and epigenetic control are suggested by their association with chromatin and nuclear retention.