mRNA transcriptome sequencing of tumor bearing lungs

mRNA transcriptome sequencing of tumor bearing lungs from KrasLSL-G12D/+Lkb1fl/fl, KrasLSL-G12D/+Lkb1fl/flIl1f9-/-(KL9) and KrasLSL-G12D/+Lkb1fl/flIl1f5-/-(KL5) or KrasLSL-G12D/+Tp53fl/fl, KrasLSL-G12D/+Tp53fl/flIl1f9-/-(KP9) and KrasLSL-G12D/+Tp53fl/flIl1f5-/-(KP5) after 10 weeks Ad-cre injection Tumor-burdened lungs from KL/KL5/KL9 mice and KP/KP5/KP9 mice were perfused through alveolar lavage and cardiac lavage with PBS, dry it quickly, and then homogenized in 2 ml of TRIzol (Invitrogen). Total RNAs were prepared and the quality of RNAs was determined by agarose gel electrophoresis and spectrophotometer analysis. Poly(A) mRNA was subsequently purified from 10µg total RNA using NEBNext Oligo d(T)25 Magnetic Beads Isolation Module. First-strand complementary DNA was synthesized with NEBNext RNA First-Strand Synthesis Module. NEBNext Ultra II Non-Directional RNA Second Strand Synthesis Module was used for the synthesis of the complementary strand of first-strand cDNA. The resulting double-stranded DNA was purified and Vazyme TruePrep DNA Library Prep kit V2 was used to prepare libraries followed by sequencing on an Illumina Hiseq X Ten platform with 150-bp paired-end reads strategy (Novogene). Quality control of mRNA-seq data was performed by using Fatsqc (v0.11.9) and low-quality bases were trimmed by Trim_galore (0.6.4_dev). All RNA-seq data were mapped to the mouse genome (Mus_musculus_Ensemble_94) by Hisat2 (v.2.0.5) and allowed a maximum of two mismatches per read. Gene expression level was calculated by FeatureCounts (v.2.0.0) with default parameters and normalized by FPKM (Fragments Per Kilobase of exon model per Million mapped fragments). Overall design: KL(n=2) , KL5(n=2) and KL9(n=2) mice were used,respectively;KP(n=2), KP5(n=3) and KP9(n=3) were used.respectively