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Retained introns increase putative microRNA targets within 3' UTRs of human mRNA

Sheng Tan1, Jiaming Guo, Qianli Huang

  • 1Department of Chemistry, University of Science and Technology of China, Hefei 230031, China.

FEBS Letters
|February 27, 2007
PubMed

Insights

Retained introns in 3' untranslated regions (UTRs) significantly increase potential microRNA (miRNA) targets in human mRNA. This finding reveals a new layer of gene regulation by intron retention impacting miRNA binding sites.

Area of Science:

  • Molecular Biology
  • Genomics
  • Bioinformatics

Background:

  • MicroRNAs (miRNAs) are key post-transcriptional regulators of gene expression.
  • Intron retention is a form of alternative splicing affecting mRNA.
  • The impact of retained introns within 3' UTRs on miRNA targeting remains underexplored.

Purpose of the Study:

  • To systematically investigate the effect of retained introns in the 3' UTR on miRNA target sites.
  • To determine if retained introns influence the number and location of miRNA binding sites in human mRNA.

Main Methods:

  • Analyzed 2864 human genes with retained introns using MAASE and ASD databases.
  • Identified 387 genes with retained introns within their 3' UTRs.
  • Employed miRanda, TargetScanS, and PicTar for miRNA target prediction.

Main Results:

  • Retained introns in 3' UTRs increase the number of putative miRNA targets in human mRNA.
  • Retained introns are frequently located within or near miRNA target sites.
  • Some miRNA targets exist exclusively due to the presence of retained introns.

Conclusions:

  • Retained introns represent a significant factor in modulating miRNA targeting.
  • This mechanism expands the repertoire of miRNA-regulated genes.
  • Further investigation into 'ignored' introns by prediction software may uncover additional miRNA-target interactions.

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