ChIP-Seq Top2 peak-calling E2

Introduction

Experiment 2, or the second part of Top2 - ULS1 ChIP-Seq ipeak-calling

One of the authors also has a tutorial which is formatted into wiki format (for easy copy-pasting) here.

Raw data

• ULS1 Immunoprecipitation files:

2017_06_27_07_Uls1IP-50925901
├── 2017-06-27-07-Uls1IP_S7_L001_R1_001.fastq.gz
├── 2017-06-27-07-Uls1IP_S7_L001_R2_001.fastq.gz
├── 2017-06-27-07-Uls1IP_S7_L002_R1_001.fastq.gz
├── 2017-06-27-07-Uls1IP_S7_L002_R2_001.fastq.gz
├── 2017-06-27-07-Uls1IP_S7_L003_R1_001.fastq.gz
├── 2017-06-27-07-Uls1IP_S7_L003_R2_001.fastq.gz
├── 2017-06-27-07-Uls1IP_S7_L004_R1_001.fastq.gz
└── 2017-06-27-07-Uls1IP_S7_L004_R2_001.fastq.gz

• ULS1 Input files

2017_06_27_06_Uls1INP-50917952
├── 2017-06-27-06-Uls1INP_S6_L001_R1_001.fastq.gz
├── 2017-06-27-06-Uls1INP_S6_L001_R2_001.fastq.gz
├── 2017-06-27-06-Uls1INP_S6_L002_R1_001.fastq.gz
├── 2017-06-27-06-Uls1INP_S6_L002_R2_001.fastq.gz
├── 2017-06-27-06-Uls1INP_S6_L003_R1_001.fastq.gz
├── 2017-06-27-06-Uls1INP_S6_L003_R2_001.fastq.gz
├── 2017-06-27-06-Uls1INP_S6_L004_R1_001.fastq.gz
└── 2017-06-27-06-Uls1INP_S6_L004_R2_001.fastq.gz

• Top2 Wildtype Immunoprecipitation files

2017_06_27_09_T2WTIP-50922924
├── 2017-06-27-09-T2WTIP_S9_L001_R1_001.fastq.gz
├── 2017-06-27-09-T2WTIP_S9_L001_R2_001.fastq.gz
├── 2017-06-27-09-T2WTIP_S9_L002_R1_001.fastq.gz
├── 2017-06-27-09-T2WTIP_S9_L002_R2_001.fastq.gz
├── 2017-06-27-09-T2WTIP_S9_L003_R1_001.fastq.gz
├── 2017-06-27-09-T2WTIP_S9_L003_R2_001.fastq.gz
├── 2017-06-27-09-T2WTIP_S9_L004_R1_001.fastq.gz
└── 2017-06-27-09-T2WTIP_S9_L004_R2_001.fastq.gz

• Top2 Wildtype Input file

2017_06_27_10_T2Uls1INP-50926896
├── 2017-06-27-10-T2Uls1INP_S10_L001_R1_001.fastq.gz
├── 2017-06-27-10-T2Uls1INP_S10_L001_R2_001.fastq.gz
├── 2017-06-27-10-T2Uls1INP_S10_L002_R1_001.fastq.gz
├── 2017-06-27-10-T2Uls1INP_S10_L002_R2_001.fastq.gz
├── 2017-06-27-10-T2Uls1INP_S10_L003_R1_001.fastq.gz
├── 2017-06-27-10-T2Uls1INP_S10_L003_R2_001.fastq.gz
├── 2017-06-27-10-T2Uls1INP_S10_L004_R1_001.fastq.gz
└── 2017-06-27-10-T2Uls1INP_S10_L004_R2_001.fastq.gz

• Top2 ULS1 Immunoprecipitation files:

2017_06_27_11_T2Uls1IP-50919923
   ├── 2017-06-27-11-T2Uls1IP_S11_L001_R1_001.fastq.gz
   ├── 2017-06-27-11-T2Uls1IP_S11_L001_R2_001.fastq.gz
   ├── 2017-06-27-11-T2Uls1IP_S11_L002_R1_001.fastq.gz
   ├── 2017-06-27-11-T2Uls1IP_S11_L002_R2_001.fastq.gz
   ├── 2017-06-27-11-T2Uls1IP_S11_L003_R1_001.fastq.gz
   ├── 2017-06-27-11-T2Uls1IP_S11_L003_R2_001.fastq.gz
   ├── 2017-06-27-11-T2Uls1IP_S11_L004_R1_001.fastq.gz
   └── 2017-06-27-11-T2Uls1IP_S11_L004_R2_001.fastq.g

• Top2 ULS1 Input files

2017_06_27_08_T2WTINP-50917953
├── 2017-06-27-08-T2WTINP_S8_L001_R1_001.fastq.gz
├── 2017-06-27-08-T2WTINP_S8_L001_R2_001.fastq.gz
├── 2017-06-27-08-T2WTINP_S8_L002_R1_001.fastq.gz
├── 2017-06-27-08-T2WTINP_S8_L002_R2_001.fastq.gz
├── 2017-06-27-08-T2WTINP_S8_L003_R1_001.fastq.gz
├── 2017-06-27-08-T2WTINP_S8_L003_R2_001.fastq.gz
├── 2017-06-27-08-T2WTINP_S8_L004_R1_001.fastq.gz
└── 2017-06-27-08-T2WTINP_S8_L004_R2_001.fastq.gz

Concatenation

Splitting the rawdata into lanes is not really necessary for these experiments, so the above were concatenated to form:

rawcatdata/
├── ULS1_INP_R1.fastq.gz
├── ULS1_INP_R2.fastq.gz
├── ULS1_IP_R1.fastq.gz
├── ULS1_IP_R2.fastq.gz
├── ULS1_T2_INP_R1.fastq.gz
├── ULS1_T2_INP_R2.fastq.gz
├── ULS1_T2_IP_R1.fastq.gz
├── ULS1_T2_IP_R2.fastq.gz
├── WT_T2_INP_R1.fastq.gz
├── WT_T2_INP_R2.fastq.gz
├── WT_T2_IP_R1.fastq.gz
└── WT_T2_IP_R2.fastq.gz

(order not respected)

Dataset quality analysis and filtering

Raw unfiltered data

Using FASTQC to view quality aspects inidvidually:

• ULS1_INP_R1
• ULS1_INP_R2
• ULS1_IP_R1
• ULS1_IP_R2
• ULS1_T2_INP_R1
• ULS1_T2_INP_R2
• ULS1_T2_IP_R1
• ULS1_T2_IP_R2
• WT_T2_INP_R1
• WT_T2_INP_R2
• WT_T2_IP_R1
• WT_T2_IP_R2

and then MultiQC to integrate the FASTQC files into one report

• integrated quality report.

Adaptor-cutting and filtering procedure

The program cutadapt was applied first (this is advised) and then trimmomatic in the following manner

cutadapt -g ACACTCTTTCCCTACACGACGCTCTTCCGATCT...GATCGGAAGAGCGGTTCAGCAGGAATGCCGAG ${SAMP} -o ${OUTDIR}
RL="ILLUMINACLIP:${TS3PE2}:2:30:10 LEADING:5 TRAILING:5 SLIDINGWINDOW:4:15 MINLEN:49"
java -jar $TRIMMOJARFILE PE -threads $THRDS -phred33 $SAMP1 $SAMP2 $OUTR1 $OUTSING1 $OUTR2 $OUTSING2 $RL

The integrated MultiQC report is as follows:

• MultiQC.

The individual FastQC reports are as follows:

• ULS1_INP_R1
• ULS1_INP_R2
• ULS1_IP_R1
• ULS1_IP_R2
• ULS1_T2_INP_R1
• ULS1_T2_INP_R2
• ULS1_T2_IP_R1
• ULS1_T2_IP_R2
• WT_T2_INP_R1
• WT_T2_INP_R2
• WT_T2_IP_R1
• WT_T2_IP_R2