Nicole FarfánNicole SanhuezaMacarena BrionesLuis O. BurzioVerónica A. Burzio2023-06-072023-06-072021Farfán, N., Sanhueza, N., Briones, M., Burzio, L. O., & Burzio, V. A. (2021). Antisense noncoding mitochondrial RNA-2 gives rise to miR-4485-3p by Dicer processing in vitro. Biological Research, 54(1), 33. https://doi.org/10.1186/s40659-021-00356-0https://investigadores.udd.cl/handle/123456789/641010.1186/s40659-021-00356-02-s2.0-85117364369WOS:000708879200001<jats:title>Abstract</jats:title><jats:sec> <jats:title>Background</jats:title> <jats:p>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.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>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.</jats:p> </jats:sec><jats:sec> <jats:title>Conclusion</jats:title> <jats:p>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.</jats:p> </jats:sec>Resource Types::text::journal::journal article