Antisense noncoding mitochondrial RNA-2 gives rise to miR-4485-3p by Dicer processing in vitro

Nicole Farfán, Nicole Sanhueza, Macarena Briones, Luis O. Burzio, Verónica A. Burzio

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Background: The antisense noncoding mitochondrial RNAs (ASncmtRNAs) derive from the mitochondrial 16S gene. Knockdown of these transcripts with chemically-modified antisense oligonucleotides induces proliferative arrest, apoptosis and invasiveness reduction in tumor but not normal cells. One of these transcripts, ASncmtRNA-2, contains the complete and identical sequence of hsa-miR-4485-3p and, upon knockdown of this transcript, there is a strong increase in levels of this miRNA, suggesting ASncmtRNA-2 as a source for miR-4485-3p, which is supported by several evidences from our group and others, in the ex vivo setting. Results: Here we show that incubation of in vitro-transcribed ASncmtRNA-2 with recombinant Dicer produces RNA fragments corresponding to hsa-miR-4485-3p, showing that Dicer binds to and processes ASncmtRNA-2, strongly supporting the hypothesis that ASncmtRNA-2 acts as a precursor for miR-4485-3p. Conclusion: The in vitro results presented here strengthen the hypothesis that miR-4485-3p is derived from ASncmtRNA-2 by Dicer processing. Since miR-4485-3p is classified as a tumor suppressor miRNA, this evidence strengthens the application of ASncmtRNA knockdown for cancer therapy.

Original languageEnglish
Article number33
JournalBiological Research
Issue number1
Publication statusPublished - Dec 2021


  • Cancer
  • Cloning
  • Dicer
  • lncRNA
  • miRNA
  • ncRNA

ASJC Scopus subject areas

  • General Biochemistry,Genetics and Molecular Biology
  • General Agricultural and Biological Sciences


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