2022-07-18 生信技能树R语言小作业（中级）
2022-07-18 本文已影响0人
学习生信的小兔子
作业1
请根据R包org.Hs.eg.db找到下面ensembl 基因ID 对应的基因名(symbol)
ENSG00000000003.13
ENSG00000000005.5
ENSG00000000419.11
ENSG00000000457.12
ENSG00000000460.15
ENSG00000000938.11
library(org.Hs.eg.db)
library(clusterProfiler)
ensembl <- c("ENSG00000000003.13","ENSG00000000005.5","ENSG00000000419.11","ENSG00000000457.12","ENSG00000000460.15","ENSG00000000938.11")
ensembl_sub <- str_sub(ensembl,1,15)
gene_sym <- bitr(
geneID = ensembl_sub,
fromType = "ENSEMBL",
toType = "SYMBOL",
OrgDb = org.Hs.eg.db
)
>gene_sym
ENSEMBL SYMBOL
1 ENSG00000000003 TSPAN6
2 ENSG00000000005 TNMD
3 ENSG00000000419 DPM1
4 ENSG00000000457 SCYL3
5 ENSG00000000460 C1orf112
6 ENSG00000000938 FGR
第二种方法
g2s <- toTable(org.Hs.egSYMBOL);head(g2s)
g2e <- toTable(org.Hs.egENSEMBL);head(g2e)
ensembl <- tibble(
ensembl=c("ENSG00000000003.13","ENSG00000000005.5","ENSG00000000419.11","ENSG00000000457.12","ENSG00000000460.15","ENSG00000000938.11")
)
for (i in 1:nrow(ensembl)){
ensembl[i,]=str_sub(ensembl[i,],1,15)
}
tmp1 <- inner_join(
ensembl,g2e,by="ensembl_id"
)
tmp2 <- inner_join(
tmp1,g2s,by="gene_id"
)
tmp2
# A tibble: 6 x 3
ensembl_id gene_id symbol
<chr> <chr> <chr>
1 ENSG00000000003 7105 TSPAN6
2 ENSG00000000005 64102 TNMD
3 ENSG00000000419 8813 DPM1
4 ENSG00000000457 57147 SCYL3
5 ENSG00000000460 55732 C1orf112
6 ENSG00000000938 2268 FGR
作业2
根据R包hgu133a.db找到下面探针对应的基因名(symbol)
1053_at
117_at
121_at
1255_g_at
1316_at
1320_at
1405_i_at
1431_at
1438_at
1487_at
1494_f_at
1598_g_at
160020_at
1729_at
177_at
library(hgu133a.db)
columns(hgu133a.db)
probe_id_c <- c("1053_at","117_at","121_at","1255_g_at","1316_at",
"1320_at","1405_i_at","1431_at","1438_at","1487_at",
"1494_f_at","1598_g_at","160020_at","1729_at","177_at")
probe_id <- tibble(
probe_id=probe_id_c
)
g2s <- toTable(hgu133aSYMBOL)
tmp <- inner_join(
probe_id,g2s,by="probe_id"
)
tmp
# A tibble: 15 x 2
probe_id symbol
<chr> <chr>
1 1053_at RFC2
2 117_at HSPA6
3 121_at PAX8
4 1255_g_at GUCA1A
5 1316_at THRA
6 1320_at PTPN21
7 1405_i_at CCL5
8 1431_at CYP2E1
9 1438_at EPHB3
10 1487_at ESRRA
11 1494_f_at CYP2A6
12 1598_g_at GAS6
13 160020_at MMP14
14 1729_at TRADD
15 177_at PLD1
作业3
找到R包CLL内置的数据集的表达矩阵里面的TP53基因的表达量，并且绘制在 progres.-stable分组的boxplot图
library(CLL)
data(sCLLex)
exp <- exprs(sCLLex)
pd <- pData(sCLLex)
library(hgu95av2.db)
g2s <- toTable(hgu95av2SYMBOL)
g2s %>%
filter(symbol=="TP53")
TP53_probe_id=g2s %>%
filter(symbol=="TP53") %>%
select(probe_id)
TP53_probe_id=as.character(TP53_probe_id$probe_id)
par(mfrow=c(1,3))
boxplot(exp["1939_at",]~pd$Disease)
boxplot(exp["1974_s_at",]~pd$Disease)
boxplot(exp["31618_at",]~pd$Disease)
作业4
找到BRCA1基因在TCGA数据库的乳腺癌数据集(Breast Invasive Carcinoma (TCGA, PanCancer Atlas))的表达情况
参考：找到TP53基因在TCGA数据库的肝癌数据集的表达情况 - 简书 (jianshu.com)
作业5
找到TP53基因在TCGA数据库的乳腺癌数据集的表达量分组看其是否影响生存
参考：找到TP53基因在TCGA数据库的乳腺癌数据集的表达量分组看其是否影响生存 - 简书 (jianshu.com)
作业6
下载数据集GSE17215的表达矩阵并且提取下面的基因画热图
ACTR3B ANLN BAG1 BCL2 BIRC5 BLVRA CCNB1 CCNE1 CDC20 CDC6 CDCA1 CDH3 CENPF CEP55 CXXC5 EGFR ERBB2 ESR1 EXO1 FGFR4 FOXA1 FOXC1 GPR160 GRB7 KIF2C KNTC2 KRT14 KRT17 KRT5 MAPT MDM2 MELK MIA MKI67 MLPH MMP11 MYBL2 MYC NAT1 ORC6L PGR PHGDH PTTG1 RRM2 SFRP1 SLC39A6 TMEM45B TYMS UBE2C UBE2T
load("D:/genetic_r/R-practise/GSE17215_eSet.Rdata")
gset1 <- gset[[1]]
exp <- exprs(gset1)
exp <- as.data.frame(exp)
pd <- pData(gset1)
library(hgu133a.db)
ids <- toTable(hgu133aSYMBOL)
exp=exp %>%
mutate(probe_id=rownames(exp))
exp=exp %>%
inner_join(ids,by="probe_id")
exp=exp %>%
select(-probe_id)
exp=exp %>%
select(symbol,everything())
exp=exp %>%
mutate(rowMean=rowMeans(.[,-1])) %>%
arrange(desc(rowMean)) %>%
distinct(symbol,.keep_all = T) %>%
select(-rowMean) %>%
column_to_rownames("symbol")
ng='ACTR3B ANLN BAG1 BCL2 BIRC5 BLVRA CCNB1 CCNE1 CDC20 CDC6 CDCA1 CDH3 CENPF CEP55 CXXC5 EGFR ERBB2 ESR1 EXO1 FGFR4 FOXA1 FOXC1 GPR160 GRB7 KIF2C KNTC2 KRT14 KRT17 KRT5 MAPT MDM2 MELK MIA MKI67 MLPH MMP11 MYBL2 MYC NAT1 ORC6L PGR PHGDH PTTG1 RRM2 SFRP1 SLC39A6 TMEM45B TYMS UBE2C UBE2T'
ng=str_split(ng,' ')
ng=unlist(ng)
table(ng%in%rownames(exp))
ng=ng[ng%in%rownames(exp)]
dat=exp[ng%in%rownames(exp),]
# 清洗掉不存在的ng，注意这一步存在排序（连同下一步理解）
ng=ng[ng %in% rownames(exp)]
dat=exp[ng,]
# 画图
dat=log2(dat)
pheatmap::pheatmap(dat,scale = 'row')
作业7
下载数据集GSE24673的表达矩阵计算样本的相关性并且绘制热图，需要标记上样本分组信息
rm(list = ls())
options(stringsAsFactors = F)
gset <- getGEO( 'GSE24673', getGPL = F )
library(GEOquery)
gset <- gset [[1]]
exp <- exprs(gset)
pd <- pData(gset)
exp <- as.data.frame(exp)
group_list=c('rbc','rbc','rbc',
'rbn','rbn','rbn',
'rbc','rbc','rbc',
'normal','normal')
exp[1:4,1:4]
#相关性分析
M=cor(exp)
pheatmap::pheatmap(M)
tmp=data.frame(g=group_list)
rownames(tmp) <- colnames(M)
pheatmap::pheatmap(M,annotation_col = tmp)
作业8
找到 GPL6244 platform of Affymetrix Human Gene 1.0 ST Array 对应的R的bioconductor注释包，并且安装它！
可在此搜索
用R获取芯片探针与基因的对应关系三部曲-bioconductor | 生信菜鸟团 (bio-info-trainee.com)
platformMap <- data.table::fread("resource/platformMap.txt",data.table = F)
[1] "hugene10sttranscriptcluster.db" #可获得对应的注释包
## 平台的名称如何知道?
index <- "GPL6244"
## 数据储存在bioc_package这一列中
paste0(platformMap$bioc_package[grep(index,platformMap$gpl)],".db")
## 安装R包,可以直接安装，这里用了判断
if(!requireNamespace("hugene10sttranscriptcluster.db")){
options(BioC_mirror="https://mirrors.ustc.edu.cn/bioc/")
BiocManager::install("hugene10sttranscriptcluster.db",update = F,ask = F)
}
## 加载R包
library(hugene10sttranscriptcluster.db)
作业9
下载数据集GSE42872的表达矩阵，并且分别挑选出 所有样本的(平均表达量/sd/mad/)最大的探针，并且找到它们对应的基因。
rm(list = ls())
options(stringsAsFactors = F)
gset <- getGEO( 'GSE42872', getGPL = F )
library(GEOquery)
gset <- gset [[1]]
exp <- exprs(gset)
pd <- pData(gset)
exp <- as.data.frame(exp)
#由平台 "GPL6244"可得出注释包为hugene10sttranscriptcluster.db
#加载注释包
library(hugene10sttranscriptcluster.db)
ids <- toTable(hugene10sttranscriptclusterSYMBOL)
exp=exp %>%
rownames_to_column("probe_id")
exp <- inner_join(exp,ids,by="probe_id")
exp=exp %>%
select(probe_id,symbol,everything())
#平均表达量
exp=exp %>%
mutate(rowmean=rowMeans(.[,-c(1,2)]))
#找最大
exp %>%
arrange(-rowmean) %>%
head(1)
#7953385 GAPDH
#mad
exp=exp %>%
mutate(md=apply(exp[,3:8],1,median))
exp %>%
arrange(-md) %>%
head(1)
#7953385 GAPDH
#sd
exp=exp %>%
mutate(sd=apply(exp[,3:8],1,sd))
exp %>%
arrange(-sd) %>%
head(1)
#8133876 CD36
作业10
下载数据集GSE42872的表达矩阵，并且根据分组使用limma做差异分析，得到差异结果矩阵
rm(list = ls())
options(stringsAsFactors = F)
gset <- getGEO( 'GSE42872', getGPL = F )
library(GEOquery)
gset <- gset [[1]]
exp <- exprs(gset)
exp <- as.data.frame(exp)
pd <- pData(gset)
group_list=character(6)
for (i in 1:nrow(pd)){
group_list[i]=strsplit(pd$title[i],' ')[[1]][4]
}
exprSet=exp
# 用limma包做差异表达分析
#差异分析重点在于做好表达矩阵和分组信息，具体原理可以不用理解
suppressMessages(library(limma))
design <- model.matrix(~0+factor(group_list))
colnames(design)=levels(factor(group_list))
rownames(design)=colnames(exprSet)
design
contrast.matrix<-makeContrasts(paste0(unique(group_list),collapse = "-"),levels = design)
contrast.matrix
##step1
fit <- lmFit(exprSet,design)
##step2
fit2 <- contrasts.fit(fit, contrast.matrix) ##这一步很重要，大家可以自行看看效果
fit2 <- eBayes(fit2) ## default no trend !!!
##eBayes() with trend=TRUE
##step3
tempOutput = topTable(fit2, coef=1, n=Inf)
nrDEG = na.omit(tempOutput)
#write.csv(nrDEG2,"limma_notrend.results.csv",quote = F)
head(nrDEG)
参考：盘一盘 生信技能树R语言小作业（中级） - 简书 (jianshu.com)
