RNA extraction was performed as described previously [15], using TRIzol (Ambion) and the Direct-zol miniprep kit (Zymo Research). To detect maternally deposited sisRNA and mRNA, stage 14 oocytes were manually isolated to avoid contamination with pre-mRNA in transcriptionally active germline cells. For experiments involving detection of pre-mRNA and mRNA for gene expression and splicing efficiency, whole ovaries were used as they reflect the steady-state levels of pre-mRNA and mRNA as described in previous studies [32,33].
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