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DNA解析2 - 配列取得 memo

Last updated at Posted at 2019-02-01

###フロー
Short Read Array配列取得 ⇨ Qualityチェック ⇨ トリミング


###SRA
####検索

image.png + ページ中ほどの、Accession List、RunInfo Tableをダウンロード。 image.png

####SRAファイル取得

> prefetch --option-file SRR_Acc_List.txt --max-size 100GB

$HOME/ncbi/public/sra/へ保存される。

####Fastq形式へ変換

> fastq-dump --split-files ~/ncbi/public/sra/*.sra

###クオリティチェック - FastQC

> fastqc SRR8512918.fastq
> open -a Safari SRR8512918_fastqc.html

FastQC.png
項目: http://www.bioinformatics.babraham.ac.uk/projects/fastqc/Help/3%20Analysis%20Modules/


###トリミング
先頭と末尾から、クオリティー値が30未満の塩基を取り除く。
インストール: https://bi.biopapyrus.jp/rnaseq/qc/trimmomatic.html

> java -jar trimmomatic-0.33.jar PE -phred33 in1.fq in2.fq out1_paired.fq out1_unpaired.fq out2_paired.fq out2_unpaired.fq LEADING:30 TRAILING:30
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