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Additive and transcript-specific effects of KPAP1 and TbRND activities on 3' non-encoded tail characteristics and

Sara L Zimmer1, Sarah M McEvoy, Sarita Menon

  • 1Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, New York, United States of America.

Plos One
|May 26, 2012
PubMed

Insights

Short tails on mitochondrial mRNAs significantly affect RNA stability, with oligo(A) tails often stabilizing RNAs. Non-tailed RNAs are not inherently unstable, indicating complex regulation of mRNA decay.

Area of Science:

  • Mitochondrial biology
  • RNA metabolism
  • Molecular genetics

Background:

  • mRNA 3' end modifications, including oligo(A) and oligo(U) tails, are known to influence RNA stability in kinetoplastid mitochondria.
  • The uridylate-specific exoribonuclease TbRND targets U-tailed guide RNAs, but its role in uridylated mRNA decay is not well understood.
  • A comprehensive understanding of the interplay between tail composition and RNA decay pathways is lacking.

Purpose of the Study:

  • To investigate the impact of mRNA 3' tail composition (adenylation and uridylation) on RNA stability in kinetoplastid mitochondria.
  • To elucidate the role of the exoribonuclease TbRND and the poly(A) polymerase KPAP1 in regulating mitochondrial RNA decay.
  • To determine how tail modifications affect RNA editing and stability.

Main Methods:

  • Analysis of mRNA abundance and 3' tail composition in kinetoplastid cells with single or double knockdowns of TbRND and KPAP1.
  • Quantitative assessment of RNA decay rates under different tailing conditions.
  • Investigation of RNA editing efficiency in relation to 3' tail status.

Main Results:

  • Both adenylation and uridylation exhibit transcript-specific effects on mitochondrial RNA stability.
  • Oligo(A) and A-rich tails can stabilize a subset of both edited and never-edited mitochondrial RNAs.
  • Non-tailed RNAs are not inherently unstable, suggesting additional regulatory mechanisms.
  • Oligo(U) tails are not universally destabilizing for all RNAs.
  • RNA uridylation susceptibility varies significantly in the absence of KPAP1.
  • 3' tail composition appears to influence the RNA editing process.

Conclusions:

  • Mitochondrial mRNA 3' tail composition plays a critical, transcript-specific role in regulating RNA stability and decay.
  • TbRND and KPAP1 are key factors in the uridylation and adenylation-dependent decay pathways.
  • RNA stability is influenced by factors beyond simple tailing, including potential spatial segregation.
  • 3' tailing mechanisms are intertwined with the RNA editing machinery in kinetoplastid mitochondria.

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