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3 protocols using bio 38033

1

Quantifying Mouse Muscle Pdk4 mRNA

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We purified total RNA from mouse quadriceps muscles by guanidinium thiocyanate-phenol-chloroform extraction. Briefly, we homogenized tissues in TRIsure (Bioline BIO-38033) and mixed with 1-bromo-3-chloropropane. After centrifugation, we mixed aqueous phase with 2-propanol to precipitate RNA. The precipitate was pelleted by centrifugation and washed with ethanol. We analyzed RNA with NanoDrop 2000 (Thermo) to determine purity and quantity and used 1 µg of RNA for first-strand cDNA synthesis (Quanta 95048). We performed quantitative RT-PCR using SensiFast SYBR green (Bioline) on the CFX384 Real Time PCR system (BioRAD). We expressed data as relative expression of Pdk4 mRNA by comparative threshold method using 36B4 as the internal control. We used the following primers: Pdk4 forward 5′-CCGCTGTCCATGAAGCA-3′, reverse 5′-GCAGAAAAGCAAAGGACGTT-3′ and 36B4 forward 5′-GCAGACAACGTGGGCTCCAAGCAGAT-3′, reverse 5′-GGTCCTCCTTGGTGAACACGAAGCCC-3′.
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2

Total RNA Extraction and cDNA Synthesis

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Total RNA was extracted from ST2 cells using TRIsure (Bioline, BIO-38033). Medium was aspirated and 1000 μl of TRIsure was added to 6-wells. To separate RNA from DNA and proteins, 200 μl of chloroform (Carl Roth, 6340.1) was added. To precipitate RNA from the aqueous phase, 400 μl of 100% isopropanol (Carl Roth, 6752.4) was added and RNA was incubated at −20°C overnight. cDNA synthesis was done using 1 μg of total RNA, 0.5 mM dNTPs (ThermoFisher Scientific, R0181), 2.5 μM oligo dT-primer (Eurofins MWG GmbH, Germany), 1 U/μl Ribolock RNase inhibitor (ThermoFisher Scientific, EO0381) and 1 U/μl M-MulV Reverse transcriptase (ThermoFisher Scientific, EP0352) for 1 h at 37°C or 5 U/ μl RevertAid Reverse transcriptase for 1 h at 42°C. The PCR reaction was stopped by incubating samples at 70°C for 10 min.
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3

Small RNA Sequencing of Synchronized Worms

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Synchronised animals were grown to 1 day-old adults 20 °C. After being washed with M9 to remove bacteria, animals were resuspended in TRIsure (Bioline, BIO-38033). Animals were lysed with 5× freeze-thaw cycles in liquid nitrogen. Total RNA was isolated by chloroform extraction. For 5′ -independent libraries, 5 µg of total RNA was treated with 5′ polyphosphatase (Epicenter, RP8092H). Small RNAs were indexed using the TruSeq small RNA sample kit (Illumina) and size selected by gel separation in 6% TBE gels (Life Tech) and subsequently purified.
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