基因组实战03: WGS toy example

借鉴Reference中第2、3篇文章的代码。分析的数据是大肠杆菌，因为基因组小，适合拿来快速跑通整个流程


00 下载fastq数据


mkdir -p ~/Project/DNA/raw

cd ~/Project/DNA/raw

wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR177/003/SRR1770413/SRR1770413_1.fastq.gz

wget ftp://ftp.sra.ebi.ac.uk/vol1/fastq/SRR177/003/SRR1770413/SRR1770413_2.fastq.gz


01 filter the bad quality reads and remove adaptors

脚本

#!/bin/bash

#clean.sh

# python3.10/python2.7

# fastqc multiqc trim_galore


HOME_DIR=~/Project/DNA

FASTQ_DIR=${HOME_DIR}/raw

CLEAN_DIR=${HOME_DIR}/clean

N_JOBS=12


if  [ ! -d $CLEAN_DIR ]

then

    mkdir -p $CLEAN_DIR

fi


micromamba activate dna2


# 1.QC

cd $FASTQ_DIR

fastqc --thread $N_JOBS *fastq.gz && multiqc .


# 2.remove adapter

micromamba activate dna3

for FILE in `ls $FASTQ_DIR/*_1.fastq.gz`

do

    SAMPLE=`basename $FILE | sed s/_1\.fastq\.gz//`

    echo "Processing $SAMPLE"


    F1=$FASTQ_DIR/$SAMPLE"_1.fastq.gz"

    F2=$FASTQ_DIR/$SAMPLE"_2.fastq.gz"


    trim_galore \

        --quality 30 \

        --length 50 \

        --output_dir $CLEAN_DIR \

        --cores $N_JOBS \

        --paired \

        --fastqc \

        -e 0.1 \

        --trim-n \

        $F1 $F2


    mv $CLEAN_DIR/${SAMPLE}"_1_val_1.fq.gz" \

        $CLEAN_DIR/${SAMPLE}"_1.fastq.gz"


    mv $CLEAN_DIR/${SAMPLE}"_2_val_2.fq.gz" \

        $CLEAN_DIR/${SAMPLE}"_2.fastq.gz"


    mv $CLEAN_DIR/${SAMPLE}"_1_val_1_fastqc.html" \

        $CLEAN_DIR/${SAMPLE}"_1_fastqc.html"


    mv $CLEAN_DIR/${SAMPLE}"_1_val_1_fastqc.zip" \

        $CLEAN_DIR/${SAMPLE}"_1_fastqc.zip"


    mv $CLEAN_DIR/${SAMPLE}"_2_val_2_fastqc.html" \

        $CLEAN_DIR/${SAMPLE}"_2_fastqc.html"


    mv $CLEAN_DIR/${SAMPLE}"_2_val_2_fastqc.zip" \

        $CLEAN_DIR/${SAMPLE}"_2_fastqc.zip"

done


# 3.QC for clean

cd $CLEAN_DIR

micromamba activate dna2

multiqc .


运行

source clean.sh &> clean.sh.log &

02 align

下载参考基因组数据

curl -OJX GET "https://api.ncbi.nlm.nih.gov/datasets/v2alpha/genome/accession/GCF_000005845.2/download?include_annotation_type=GENOME_FASTA,GENOME_GFF,RNA_FASTA,CDS_FASTA,PROT_FASTA,SEQUENCE_REPORT&filename=GCF_000005845.2.zip" -H "Accept: application/zip"

unzip GCF_000005845.2.zip

cp ncbi_dataset/data/GCF_000005845.2/GCF_000005845.2_ASM584v2_genomic.fna genome/E.coli.fa

生成的文件索引

#!/bin/bash

#python2.7

HOME_DIR=~/Project/DNA

GENOME_FILE=E.coli.fa

INDEX_DIR=$HOME_DIR/genome

micromamba activate dna2

echo "----------------- BWA INDEX START-----------------"

bwa index $INDEX_DIR/$GENOME_FILE && \

echo "----------------- BWA INDEX DONE -----------------"


echo "----------------- CreateSequenceDictionary START -----------------"

gatk CreateSequenceDictionary \

    --REFERENCE $INDEX_DIR/$GENOME_FILE \

    --OUTPUT $INDEX_DIR/E.coli.dict && echo "** dict done **"  && \

echo "----------------- CreateSequenceDictionary DONE -----------------"


samtools faidx $INDEX_DIR/$GENOME_FILE

source index.sh &> index.sh.log &

对比



-R：Read group；


ID：Read group identifier，必须唯一，一般为样本名；


SM：Sample，样本名；


LB：Library，测序文库；


PL：Platform，测序平台




#!/bin/bash

#python2.7

micromamba activate dna2

HOME_DIR=~/Project/DNA

BWA_INDEX=$HOME_DIR/genome/E.coli.fa

CLEAN_DIR=$HOME_DIR/clean

ALIGN_DIR=$HOME_DIR/align

N_JOBS=12


if  [ ! -d $ALIGN_DIR ]

then

    mkdir -p $ALIGN_DIR

fi


for FILE in `ls $CLEAN_DIR/*_1.fastq.gz`

do

    SAMPLE=`basename $FILE | sed s/_1\.fastq\.gz//`


    echo "----------------- BWA ${SAMPLE} START -----------------"

    F1=$CLEAN_DIR/$SAMPLE"_1.fastq.gz"

    F2=$CLEAN_DIR/$SAMPLE"_2.fastq.gz"

    RG="@RG\tID:"$SAMPLE"\tSM:"$SAMPLE"\tLB:WGS\tPL:ILLUMINA"

    bwa mem -t $N_JOBS -R $RG $BWA_INDEX $F1 $F2 | \

        samtools sort --threads $N_JOBS -O bam -o $ALIGN_DIR/$SAMPLE".bam" - && \

    echo  "----------------- BWA ${SAMPLE} DONE -----------------"


    echo "----------------- MarkDuplicates ${SAMPLE} START-----------------"

    gatk MarkDuplicates \

        --INPUT ${ALIGN_DIR}/${SAMPLE}".bam" \

        --OUTPUT ${ALIGN_DIR}/${SAMPLE}".mark.bam" \

        --METRICS_FILE ${ALIGN_DIR}/${SAMPLE}".mark.matrics" && \

    echo  "----------------- MarkDuplicates ${SAMPLE} DONE -----------------" &&

    rm -f ${ALIGN_DIR}/${SAMPLE}".bam"


    echo "-----------------Samtools Indexing ${SAMPLE} START -----------------"

    samtools index ${ALIGN_DIR}/${SAMPLE}".mark.bam"  && \

    echo  "----------------- Samtools Indexing ${SAMPLE} DONE -----------------"

done

source bwa.sh &> bwa.sh.log &

03 call variants

#!/bin/bash

micromamba activate dna2

HOME_DIR=~/Project/DNA

BWA_INDEX=$HOME_DIR/genome/E.coli.fa

ALIGN_DIR=$HOME_DIR/align

MUTATION=$HOME_DIR/mutation

N_JOBS=12


if  [ ! -d $MUTATION ]

then

    mkdir -p $MUTATION

fi


# 1 每个样本生成一个gvcf文件

for FILE in `ls ${ALIGN_DIR}/*.mark.bam`

do

    SAMPLE=`basename $FILE | sed s/\.mark\.bam//`

    echo $SAMPLE


    gatk HaplotypeCaller \

    --reference $BWA_INDEX \

    --emit-ref-confidence GVCF \

    --input $ALIGN_DIR/$SAMPLE".mark.bam" \

    --output $MUTATION/$SAMPLE".gvcf" && echo "** gvcf done **"

done


# 2 通过gvcf检测变异

gatk GenotypeGVCFs \

--reference $BWA_INDEX \

--variant $MUTATION/$SAMPLE".gvcf" \

--output $MUTATION/final.vcf && echo "** vcf done **"


# 3 压缩 构建tabix索引

bgzip -f $MUTATION/final.vcf

tabix -p vcf $MUTATION/final.vcf.gz


# 4.过滤（硬指标）


## 使用SelectVariants，选出SNP

gatk SelectVariants \

    -select-type SNP \

    --variant $MUTATION/final.vcf.gz \

    --output $MUTATION/final.snp.vcf.gz


## 为SNP作硬过滤

gatk VariantFiltration \

    --variant $MUTATION/final.snp.vcf.gz \

    --filter-expression "QD < 2.0 || MQ < 40.0 || FS > 60.0 || SOR > 3.0 || MQRankSum < -12.5 || ReadPosRankSum < -8.0" \

    --filter-name "PASS" \

    --output $MUTATION/final.snp.filter.vcf.gz


## 使用SelectVariants，选出Indel

gatk SelectVariants \

    -select-type INDEL \

    --variant $MUTATION/final.vcf.gz \

    --output $MUTATION/final.indel.vcf.gz


## 为Indel作过滤

gatk VariantFiltration \

    --variant $MUTATION/final.indel.vcf.gz \

    --filter-expression "QD < 2.0 || FS > 200.0 || SOR > 10.0 || MQRankSum < -12.5 || ReadPosRankSum < -8.0" \

    --filter-name "PASS" \

    --output $MUTATION/final.indel.filter.vcf.gz


# 重新合并过滤后的SNP和Indel

gatk MergeVcfs \

    --INPUT $MUTATION/final.snp.filter.vcf.gz \

    --INPUT $MUTATION/final.indel.filter.vcf.gz \

    --OUTPUT $MUTATION/final.filter.vcf.gz


cd $MUTATION

rm -f *snp* *indel* final.vcf* *gvcf*

source call_variant.sh &> call_variant.sh.log &

Reference

# gatk api

https://gatk.broadinstitute.org/hc/en-us/articles/13832655155099--Tool-Documentation-Index

#GATK4.0和全基因组数据分析实践 

https://mp.weixin.qq.com/s/Heu-jmJeM3EQy2PmyA-gyQ

https://mp.weixin.qq.com/s/ooU7Tuh0adGNKEISELFjUA

#GATK best practices

https://mp.weixin.qq.com/s/GvuL8NlFSkQ6MVdghlEYUQ

# trim-galore

https://mp.weixin.qq.com/s/n3G_qot5mhB3ZR1gcDnV6g

# 方法分享 | 全外显子测序分析的标准流程

https://mp.weixin.qq.com/s/WOeLHXIomhNjSFXjXZ8zcg

https://mp.weixin.qq.com/s/WOeLHXIomhNjSFXjXZ8zcg

# GATK4全基因组数据分析最佳实践 

https://mp.weixin.qq.com/s/r3sghKtEKq1FnjQ05WCcnA

# 第1节 测序技术 

https://mp.weixin.qq.com/s/kq2i5tNZmm9GKGAx2Day-g

#第2节 FASTA和FASTQ 

https://mp.weixin.qq.com/s/0h5B3T6RKTHTsZBuoZvtgQ

#第3节 数据质控 

https://mp.weixin.qq.com/s/8hY0U48kiVTH6Yx4JBcAhg#

#第4节 构建WGS主流程 

https://mp.weixin.qq.com/s/AT2oodvdqWgbj1gvVo1hWQ

#第5节 理解并操作BAM文件 

https://mp.weixin.qq.com/s/UnMyAuUHmK7DMGo8h88oQw


# WGS(全基因组测序)/WES(全外显子组测序)/WGRS(全基因组重测序)分析与可视化教程

https://zhuanlan.zhihu.com/p/380684876


https://blog.csdn.net/bio_meimei/article/details/108236406


https://zhuanlan.zhihu.com/p/422365954


https://zhuanlan.zhihu.com/p/69726572

https://hpc.nih.gov/training/gatk_tutorial/haplotype-caller.html

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