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PCR was performed following the manufacturer��s protocol using PCR primers listed in Table?S2 in Supporting Information. The PCR products were subcloned and sequenced as previously described (Daimon et?al. 2003). Total RNA was isolated from eggs and tissues of fifth instar day 3 larvae https://www.selleck.cn/products/AZD0530.html of the p50T strain and reverse-transcribed as previously described (Daimon et?al. 2003). Hydrochloric acid treatment of eggs was carried out at 20 h AEL. Semi-quantitative RT-PCR analysis was performed as previously described (Daimon et?al. 2010) using the primers listed in Table?S2 in Supporting Information. PCR conditions were as follows: 30�C40 cycles of 94?��C for 30?s, 54?��C for 30?s and 72?��C for 1.5?min. The identity of each RT-PCR product was confirmed by DNA sequencing. RNA blot analysis was performed as previously described (Daimon et?al. 2008). Briefly, total RNA from eggs was extracted using TRIzol reagent (Invitrogen). One microgram of RNA was loaded and hybridized with specific probes. RNA probes for Bm-w-2 and Bm-w-3 were synthesized by in vitro transcription using the https://www.selleckchem.com/products/forskolin.html DIG RNA labeling kit (Roche). The DNA probe for ribosomal protein 49 (rp49) was prepared by PCR using the DIG PCR probe synthesis kit (Roche). Primers used for probe synthesis are listed in Table?S2 in Supporting Information. The template for the synthesis of dsRNA corresponding to Bm-w-2 (1055�C1488?nt) or EGFP was amplified by PCR using gene-specific primers containing T7 polymerase sites (see Table?S1 in Supporting Information). The resulting PCR products were purified and used as templates https://www.selleckchem.com/products/cx-5461.html to generate dsRNAs using the MEGAscript RNAi Kit (Ambion) according to the manufacturer��s instructions. After synthesis, the products were analyzed by gel electrophoresis and the concentrations of dsRNAs were measured spectrophotometrically (A260). The dsRNA solutions were diluted to 10?nm in RNase-free water and 2�C3?nL was injected into embryos of the pnd+ strain at the preblastoderm stage as described previously (Quan et?al. 2002a). Injected embryos were incubated at 25?��C in a moist Petri dish. To perform qRT-PCR analysis, total RNA from a single egg injected with dsRNA was extracted at 24 h AEL using Isogen (Nippon Gene) and used as a template for the synthesis of cDNA with RevertraAce reverse transcriptase (Toyobo). The expression level of Bm-w-2 mRNA and Bm-w-3 mRNA was quantified using a LightCycler 1.5 (Roche). To ensure homogeneity of the amplified PCR product, melting curve analysis was performed on all reactions. The Bombyx rp49 gene was used to normalize transcript levels. Primers used for quantitative PCR are listed in Table?S1 in Supporting Information. Quantitative PCR was preformed in duplicate. Statistical test was performed using Student��s t-test (n?=?4). A P-value of