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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Natural antisense transcription from a comparative perspective.

Monica J Piatek1, Victoria Henderson1, Hany S Zynad1

  • 1RNA Interest Group, Institute for Cell and Molecular Biosciences, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, United Kingdom.

Genomics
|June 1, 2016
PubMed
Summary

Researchers identified a human natural antisense transcript (NAT) linked to SLC34A1, which is an alternatively spliced Profilin3 (PFN3) transcript primarily found in the testis. This discovery reveals distinct NAT origins and independent regulation, suggesting novel regulatory mechanisms in male germ cells.

Keywords:
EvolutionHumanMouseNa-phosphate transportNatural antisense transcript

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Area of Science:

  • Genetics
  • Molecular Biology
  • Transcriptomics

Background:

  • Natural antisense transcripts (NATs) are known to regulate gene expression of complementary sense transcripts with high specificity.
  • Previous studies successfully identified NATs associated with Slc34a loci in fish and mice, which encode sodium-phosphate transporters.

Purpose of the Study:

  • To clone and characterize a human NAT related to the SLC34A1 locus.
  • To investigate the origin and regulatory mechanisms of Slc34a-related NATs across species.
  • To explore the expression patterns and potential functions of these NATs, particularly in the testis.

Main Methods:

  • Cloning of human SLC34A1-related NAT.
  • Phylogenetic analysis of NAT origins.
  • Expression analysis of NATs and their sense counterparts.
  • Examination of human and mouse loci with bidirectional transcription.

Main Results:

  • A human SLC34A1-related NAT was identified as an alternatively spliced transcript of Profilin3 (PFN3), predominantly expressed in the testis.
  • Two distinct mechanisms for Slc34a-related NAT formation were proposed: alternative splicing of downstream genes (human/mouse Pfn3) and transcription from bidirectional promoters (zebrafish Rbpja).
  • Expression analysis indicated independent regulation of complementary Slc34a mRNAs. Randomly selected human/mouse loci showed limited conservation and independent regulation of NATs, with a notable reduction on X chromosomes in regions escaping inactivation.

Conclusions:

  • The human SLC34A1-associated NAT is an alternatively spliced PFN3 transcript, primarily expressed in the testis.
  • Distinct evolutionary pathways generate Slc34a-related NATs, involving alternative splicing or bidirectional promoters.
  • The locus structure and expression patterns suggest NATs play a role in testis-specific regulatory mechanisms, independent of the sense transcript's function.