Creosote

Creosote genome sequencing and assembly notes:

• Sample obtained from front yard of 4951 W. McElroy Dr.
• Sequences obtained from one lane of Illumina HiSeq2000
• Fastq files delivered from UAGC
  • 82 files
    • lane3_NoIndex_L003_R1_041.fastq
    • lane3_NoIndex_L003_R2_041.fastq
  • Need to understand if these are paired-end reads
  • Need to get adapter sequences used in sequencing
  • Description of Fastq file format with notes on specific decoding of header names generated by various technologies: http://en.wikipedia.org/wiki/FASTQ_format
• Check quality with fastqc: http://www.bioinformatics.bbsrc.ac.uk/projects/fastqc/
  • Creosote First Run FastQC

• Sequences cleaned using trimReads by Haibao Tang: https://github.com/tanghaibao/trimReads/tree/
  • NOte: Only use on single reads
  • Ran with supplied adapter sequence file:

>Adapter 4
TGACCA
>Adapter 4 rc
TGGTCA

• • Command-line run:

Running /home/elyons/bin/trimReads  -Q 33 -f /home/elyons/projects/genome/data/creosote/Sample_lane3/adapter/adapter.faa ./lane3_NoIndex_L003_R2_015.fastq

• • Output of trimReads:

New Notes for processing"

• Trim Paired ends with Trimmomatic: http://www.usadellab.org/cms/index.php?page=trimmomatic
• Assumes Illumina Encoding (code: 64, not code: 33)
  • Need to convert for the HighSeq Reads:
  • easy_install biopython
  • git clone git://github.com/tanghaibao/jcvi.git
  • export PYTHONPATH=/lib/python (which is the dir above jcvi)
  • python -m jcvi.formats.fastq (Install missing packages)

Steps:

• Merge R1 files; merge R2 files
• gzip them
• Run this: python -m jcvi.apps.baseclean trim R1.fastq.gz R2.fastq.gz
  • NOTE: This program should download trimmomatic, but may need to update the path of the timmomatic program in the program
• Note: Bao recommends CLC for genome assembly. Runs faster, less memory, less sensitive to bad data. Compute intensive.
• If the Trimmer script fails for silly reasons, you can run it from the command-line:

java -Xmx4g -cp Trimmomatic-0.13/trimmomatic-0.13.jar org.usadellab.trimmomatic.TrimmomaticPE lane3_NoIndex_L003_R1_001.b64.fastq.gz lane3_NoIndex_L003_R2_001.b64.fastq.gz lane3_NoIndex_L003_R1_001.pairs.fastq.gz lane3_NoIndex_L003_R1_001.frags.fastq.gz lane3_NoIndex_L003_R2_001.pairs.fastq.gz lane3_NoIndex_L003_R2_001.frags.fastq.gz ILLUMINACLIP:adapters.fasta:2:40:15 LEADING:3 TRAILING:3 SLIDINGWINDOW:4:15 MINLEN:36

• Running SOAPdenovo:

SOAPdenovo31mer all -s ../../soap.config.eric -o SoapAssem -K 25 -p 16 -R -d -D -F

• • Note: if SOAP crashes, try another XXmer binary (e.g. 63mer)

Running Velvet

• • Need to interleave reads:

~/src/velvet_1.1.04/shuffleSequences_fastq.pl lane3_NoIndex_L003_R1_001.pairs.fastq lane3_NoIndex_L003_R2_001.pairs.fastq merged_pairs.fastq

• • set threading of velvet with env var

export OMP_NUM_THREADS=32

• • running velveth

OMP_NUM_THREADS=32 velveth VelvetAssem 31 -shortPaired -fastq.gz merged_pairs.fastq.gz -short -fastq.gz lane3_NoIndex_L003_R1_001.frags.fastq.gz -short -fastq.gz lane3_NoIndex_L003_R2_001.frags.fastq.gz 
OMP_NUM_THREADS=32 velvetg VelvetAssem -scaffolding yes -exp_cov auto -cov_cutoff auto -min_contig_lgth 200 -ins_length 150

Other Stuff

• python -m jcvi.formats.fastq convert (read help file, default converstion
• python -m jcvi.apps.baseclean trim fastqfile (single ended)
• python -m jcvi.apps.baseclean trim R1.fastq.gz R2.fastq.gz (paired ended)

• Cat all the R1s together
• Cat all the R2s together