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Sample GSM7458249 Query DataSets for GSM7458249
Status Public on Dec 24, 2023
Title 0 min, replicate 1, RNA-seq, wildtype
Sample type SRA
 
Source name BW25113
Organism Escherichia coli
Characteristics strain: BW25113
genotype: wildtype
treatment: None
Treatment protocol Overnight seed cultures were diluted by 1:350 into 700 μL of fresh medium and grown in a 48-well plate in a microplate reader (Tecan, Spark). When the cultures grew to OD600 ~ 0.2, we carried out another dilution of 1:50 into fresh medium and cultivated with the same condition. When subcultures reached an OD600 of ~ 0.25, 10 μL gentamicin (Selleck, S4030) was supplemented to make a final concentration of 6 mg/L.
Growth protocol In all experiments, E. coli K12 BW25113 was used (originally from CICC, 23872) as the wildtype strain. Single colony was picked up from a stock LB agar plate and was grown aerobically with shaking at 220 rpm in Luria-Bertani (LB) broth (10 g/L tryptone (Oxoid, LP0042), 10 g/L NaCl (Macklin, S805275), 5 g/L yeast extract (Oxoid, LP0021)) medium overnight (typically 12 h) as the seed culture. All cultures were carried out at 37 °C with shaking at 200 rpm.
Extracted molecule total RNA
Extraction protocol For RNA exactraction, bacteria lysate was prepared using lysozyme and proteinase K. Total RNA was then purified by RNAClean XP beads (Beckman, A63987). For genomic DNA, TIANamp Bacteria DNA kit (TIANGEN, DP302) were used. See decrisption in our paper for details.
3' -end-seq library preparation method was adopted from a previous multiplexed RNA-seq library preparation method reported by Avraham et al. Systematic modifications were introduced to repurpose it to keep 3’ end information of bacterial transcripts. To prepare RNA-seq library, here we did not follow routine RNA-seq library construction method, in order to minimize the batch effect introduced when applying different library preparation protocols. Genome re-sequencing were prepared by a Tn5-based library construction method. See protocol details in our paper.
 
Library strategy RNA-Seq
Library source transcriptomic
Library selection cDNA
Instrument model Illumina NovaSeq 6000
 
Description 0min_replicate_1_RNA_seq_wt
qualified_gene_TPM.csv
Data processing For 3’ -end-seq, firstly, sequencing raw data was subjected to FastQC (v0.11.9) for quality control and cutadapt (2.10) for adaptor trimming. In detail, fastqc was used with default parameters, cutadapt command was used with parameters -q 10,10 --minimum-length 100:100 --max-n 3 --pair-filter=any -o. The data was then demultiplexed by cutadapt based on the unique RNA adaptors. Paired-end reads were aligned to E. coli reference genome (NC_000913.3) by bowtie2 (2.4.1) with parameters -X 1000 -I 18 --no-mixed --no-discordant. The mapped reads were converted to bam files by samtools (1.10). To minimize the effect of sequencing depth on further analysis, we subsampled every bam file to the equal number of 4.5 million paired-end reads. Reads were counted for bam files using R (4.0.2) method summarizeOverlaps from GenomicAlignments package (v1.26.0) in a strand specific manner, with the following options “mode = "Union", ignore.strand = FALSE, singleEnd = FALSE, preprocess.reads = invertStrand”.
For RNA-seq data, data processing was similar to our previous report (Wang et al., Environmental Microbiology 2022). Adaptor trimming, alignment to genome and gene read count table were all the same with 3’-end-seq as shown above.
For genome re-sequencing, after demultiplexing, we trimmed adaptor sequences by cutadapt (v0.11.9) and adopted breseq (0.35.3) to identify mutations from the first read of the NGS data in a default clonal mode against the reference genome (NC000913.3).
Assembly: NC000913.3
Supplementary files format and content: comma-delimited text file for expression matrix
Supplementary files format and content: xlsx file for 3' -end-seq CPM of PRSEs and mutation information
 
Submission date Jun 06, 2023
Last update date Dec 24, 2023
Contact name Tianmin Wang
E-mail(s) wangtm@shanghaitech.edu.cn
Organization name ShanghaiTech University
Department School of Life Science and Technology
Lab Tianmin Wang Lab
Street address Huaxia Middle Road, 393
City Shanghai
ZIP/Postal code 201210
Country China
 
Platform ID GPL25368
Series (1)
GSE234254 RNA polymerase stalling-derived genome instability underlies ribosomal antibiotic efficacy and resistance evolution
Relations
BioSample SAMN35646529
SRA SRX20612319

Supplementary data files not provided
SRA Run SelectorHelp
Raw data are available in SRA
Processed data are available on Series record

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