Functional Redundancy of DICER Cofactors TARBP2 and PRKRA During Murine Embryogenesis Does Not Involve miRNA Biogenesis

Genetics
Sri Ramulu N PullaguraRobert E Braun

Abstract

Several in vitro studies have suggested that canonical microRNA (miRNA) biogenesis requires the DICER cofactors TARBP2 and PRKRA for processing of pre-miRNAs to mature miRNAs. To investigate the roles of TARBP2 and PRKRA in miRNA biogenesis in vivo, and to determine possible functional redundancy, we first compared the phenotypes of Tarbp2 and Prkra single and double mutants. In contrast to Dicer -/- embryos, which die by embryonic day 7.5 (E7.5), single Tarbp2 -/- and Prkra -/- mice survive beyond E7.5 and either die perinatally or survive and exhibit cranial/facial abnormalities, respectively. In contrast, only a few Tarbp2 -/- ; Prkra -/- double mutants survived beyond E12.5, suggesting genetic redundancy between Tarbp2 and Prkra during embryonic development. Sequencing of miRNAs from single-mutant embryos at E15.5 revealed changes in abundance and isomiR type in Tarbp2 -/- , but not Prkra -/- , embryos, demonstrating that TARBP2, but not PRKRA, functions in miRNA biogenesis of a subclass of miRNAs, and suggesting that functional redundancy between TARBP2 and PRKRA does not involve miRNA biogenesis.

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Citations

Sep 17, 2020·Biomolecules·Kathi ZarnackKatja Sträßer
Jun 2, 2020·Frontiers in Cell and Developmental Biology·Neda Vishlaghi, Thomas S Lisse

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Datasets Mentioned

BETA
SRP127346

Methods Mentioned

BETA
genotyping
PCR
dissection
RNA-seq

Software Mentioned

Illumina CASAVA
mirdeep
R isomiRs
seqbuster
mirdeep2
DESEQ2

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