R语言绘图

热图

差异基因热图绘制

DESeq2或edgeR差异表达分析后数据

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#
# Create heat map from a differential expression count table.
#
# Load the library.
suppressPackageStartupMessages(library(gplots))

# The name of the file that contains the counts.
count_file = "results.csv"

# The name of the output file.
output_file = "heatmap.pdf"

# Inform the user.
print("# Tool: Create Heatmap ")
print(paste("# Input: ", count_file))
print(paste("# Output: ", output_file))

# FDR cutoff.
MIN_FDR = 0.05

# Plot width
WIDTH = 12

# Plot height.
HEIGHT = 13

# Set the margins
MARGINS = c(9, 12)

# Relative heights of the rows in the plot.
LHEI = c(1, 5)

# Read normalized counts from the standard input.
data = read.csv(count_file, header=T, as.is=TRUE)

# Subset data for values under a treshold.
data = subset(data, data$FDR <= MIN_FDR)

# The heatmap row names will be taken from the first column.
row_names = data[, 1]

# The code assumes that the normalized data matrix is listed to the right of the falsePos column.
idx = which(colnames(data) == "falsePos") + 1

# The normalized counts are on the right size.
counts = data[, idx : ncol(data)]

# Load the data from the second column on.
values = as.matrix(counts)

# Adds a little noise to each element to avoid the
# clustering function failure on zero variance rows.
values = jitter(values, factor = 1, amount = 0.00001)

# Normalize each row to a z-score
zscores = NULL
for (i in 1 : nrow(values)) {
  row = values[i,]
  zrow = (row - mean(row)) / sd(row)
  zscores = rbind(zscores, zrow)
}

# Set the row names on the zscores.
row.names(zscores) = row_names

# Turn the data into a matrix for heatmap2.
zscores = as.matrix(zscores)

# Set the color palette.
col = greenred

# Create a PDF device
pdf(output_file, width = WIDTH, height = HEIGHT)

heatmap.2(zscores, col=col, density.info="none", Colv=NULL,
    dendrogram="row", trace="none", margins=MARGINS, lhei=LHEI)

dev.off()

  • 设置差异基因筛选条件为FDR < 0.05, 还可以根据需要设置差异倍数，筛选出需要画图的基因
  • 代码默认归一化的矩阵在”falsePos”列的右侧，如果不一致，需另行调整代码

火山图

火山图数据

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# Loading library
library(tidyverse)
library(readxl)

# Import data
data <- read_xlsx("全部数据.xlsx")
summary(data)
str(data)

# Pretreat data
data$Status[data$LOG2FC > 1.2 & data$P.value<0.05 & data$OPLSDA.VIP > 1 ] <- "Up-regulated"
data$Status[data$LOG2FC < -1.2 & data$P.value<0.05 & data$OPLSDA.VIP > 1] <- "Down-regulated"
data$Status[is.na(data$Status)]  <- "Insignificant Change"

# Plot volcano chart
ggplot(data = data, aes(LOG2FC,-log10(P.value), color = Status))+
  geom_hline(yintercept = -log10(0.05),linetype = "dashed",color ="#999999")+
  geom_vline(xintercept = c(-1,1),linetype = "dashed",color ="#999999")+
  geom_point(aes(size= OPLSDA.VIP))+
  scale_size(range = c(1, 3)) +
  scale_color_manual(values = c("dodgerblue","gray","firebrick"))+
  theme_bw()+
  theme(panel.grid = element_blank())

韦恩图

韦恩图数据1

韦恩图数据2

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library(tidyverse)
library(VennDiagram)

k9_up <- read.table("NaB_T1VSNaB_C1_up.targetList.xls")
k9_down <- read.table("NaB_T1VSNaB_C1_down.targetList.xls")



H3K9ac_up <- unique(k9_up)
H3K9ac_down <- unique(k9_down)


data <- list(H3K9ac_up$V1, H3K9ac_down$V1)



venn.diagram(data, fill = c("#FFB5BF", "#97C8E0"),
             alpha = 0.5, label.col = "black",
             cex = 1.5, cat.col = c("#FFB5BF", "#97C8E0"),
             cat.cex = 1, cat.fontface = "bold",
             label.cex = 0.8,
             filename = "~/Desktop/H3K9ac_ven.png",
             category = c("UP", "DOWN"))

九象限图

九象限图

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# load package ------------------------------------------------------------

library(tidyverse)


# loda data ---------------------------------------------------------------

com <- read.csv("common.csv")

# clean data --------------------------------------------------------------

com$DEG <- ifelse(com$RNA_log2FC > 1 & com$H3K9ac_log2FC > 1, "UP-UP",
                  ifelse(com$RNA_log2FC < -1 & com$H3K9ac_log2FC < -1, "DOWN-DOWN",
                         ifelse(com$RNA_log2FC > 1 & com$H3K9ac_log2FC < -1, "UP-DOWN",
                                ifelse(com$RNA_log2FC < -1 & com$H3K9ac_log2FC > 1, "DOWN-UP",
                                       "NONE"))))

# plot image --------------------------------------------------------------

ggplot(com, aes(x = RNA_log2FC, y=H3K9ac_log2FC, colour=DEG)) +
  geom_point(alpha=0.85, size=1) +
  geom_vline(xintercept=c(-1,1),lty=4,col="black",lwd=0.5) +
  geom_hline(yintercept=c(-1,1),lty=4,col="black",lwd=0.5) +
  scale_color_manual(values=c('steelblue','#03BF7D','gray',  '#AEAF31','brown')) +
  theme_bw()+
  guides(color = "none") +
  theme(plot.margin = unit(c(1,1,1,1), "cm"),
        panel.grid = element_blank()) +
  labs(x="RNA-Seq_log2FC")

ggsave("H3K9ac_com.pdf", width = 15, height = 15, units = "cm" )