shRNA off-target effects in vivo: impaired endogenous siRNA expression and spermatogenic defects

PloS One
Hye-Won SongMiles F Wilkinson

Abstract

RNA interference (RNAi) is widely used to determine the function of genes. We chose this approach to assess the collective function of the highly related reproductive homeobox 3 (Rhox3) gene paralogs. Using a Rhox3 short hairpin (sh) RNA with 100% complementarity to all 8 Rhox3 paralogs, expressed from a CRE-regulated transgene, we successfully knocked down Rhox3 expression in male germ cells in vivo. These Rhox3-shRNA transgenic mice had dramatic defects in spermatogenesis, primarily in spermatocytes and round spermatids. To determine whether this phenotype was caused by reduced Rhox3 expression, we generated mice expressing the Rhox3-shRNA but lacking the intended target of the shRNA-Rhox3. These double-mutant mice had a phenotype indistinguishable from Rhox3-shRNA-expressing mice that was different from mice lacking the Rhox3 paralogs, indicating that the Rhox3 shRNA disrupts spermatogenesis independently of Rhox3. Rhox3-shRNA transgenic mice displayed few alterations in the expression of protein-coding genes, but instead exhibited reduced levels of all endogenous siRNAs we tested. This supported a model in which the Rhox3 shRNA causes spermatogenic defects by sequestering one or more components of the endogenous small RNA b...Continue Reading

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Citations

Apr 25, 2018·Journal of Materials Science. Materials in Medicine·Yanhui LiHuayu Tian
Jun 5, 2021·Proceedings of the National Academy of Sciences of the United States of America·Kun TanMiles F Wilkinson

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Datasets Mentioned

BETA
GSE64324

Methods Mentioned

BETA
PCR
transgenic
transfection
periodic acid Schiff
RNAseq

Software Mentioned

ImageJ
Blast
Partek genomics suite
RNAhybrid

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