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3 protocols using nextseq 500 550 mid output kit v2.5 150 cycles

1

RNA-Seq Analysis of Gene Knockdown in HEK293T Cells

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Total RNA was extracted from four biological replicates each of WT, NT, KD_2, and KD_3 HEK293T cells using QIAzol (Qiagen, catalog# 79306) and RNeasy Plus Universal Mini Kit (Qiagen, catalog# 73404) as per manufacturer’s instruction. RNA concentration was found out using a Nanodrop 2000c spectrophotometer (Thermo Fisher Scientific), and the cDNA library was synthesized from 300 ng of RNA using QuantSeq 3′ mRNA-Seq Library Prep Kit FWD for Illumina (Lexogen, catalog# 015.96) as per the manufacturer’s instruction. The concentration of the cDNA library was assessed using Qubit dsDNA HS kit (Invitrogen, catalog# Q32851) on a Qubit four Fluorimeter (Thermo Fisher Scientific). The average size of the library was assessed using a High Sensitivity DNA Kit (Agilent, catalog# 5067–4626) on a 2100 Bioanalyzer (Agilent). Equal amounts of the libraries were pooled, and 2 nmoles was sequenced using NextSeq 500/550 Mid Output Kit v2.5 (150 Cycles) (Illumina, catalog# 20024904) on NextSeq 550 instrument (Illumina). The read was single-ended and 76 bp long. The raw sequence data is deposited in the Gene Expression Omnibus (NCBI) repository (accession ID: GSE196907) and is publicly available.
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2

Transcriptome Profiling of GFP-Labeled Tumor Tissue

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Fluorescence microscopy was used to microdissect GFP-expressing tissue from age matched tumors at P65 and P95 time points (n=3 per experimental group × n=3 animals per group). RNA was isolated using the RNeasy Plus Mini Kit (Qiagen, 74134) according to the manufacturer’s protocol. RNA integrity (RIN ≥ 8.0) was confirmed using the High Sensitivity RNA Analysis Kit (AATI, DNF-472-0500) on a 12-Capillary Fragment Analyzer. Illumina sequencing libraries with 6 bp single indices were constructed from 1 μg total RNA using the TruSeq Stranded mRNA LT kit (Illumina, RS-122-2101). Resulting libraries were validated using the Standard Sensitivity NGS Fragment Analysis Kit (AATI, DNF-473-0500) on a 12-Capillary Fragment Analyzer. Equal concentrations (2nM) of libraries were pooled and sequenced with a sequencing depth of approximately 20 million reads per sample using the NextSeq 500/550 Mid Output Kit v2.5 (150 Cycles) (Illumina, 20024904) on an Illumina NextSeq550.
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3

TCRB Repertoire Profiling by immunoSEQ

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After PicoGreen quantification and quality control by Agilent BioAnalyser, 188-200ng of genomic DNA were split equally into six reactions and prepared using the immunoSEQ human TCRB Kit (Adaptive Biotechnologies) according to the manufacturer’s instructions. Briefly, multiplex PCR was used to amplify the CDR3 region for 31 cycles. After clean-up, 2μL of PCR product was used as input into library preparation with 8 cycles of PCR. Barcoded samples were pooled by volume and sequenced using custom primers on a NextSeq 500 in a SR155 run, using the NextSeq 500/550 Mid Output Kit v2.5 (150 Cycles) (Illumina). The loading concentration was 1pM and 20% spike-in of PhiX was added to the run to increase diversity and for quality control purposes. Raw BCL files were transferred to the immunoSEQ Analyser for processing and analysis.
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