plot_volcano: Volcano plot

In HuntsmanCancerInstitute/hciR: RNA-seq workflows at HCI

Volcano plot

Description

Plot fold changes and adjusted p-values in an interactive volcano plot or ggplot

Usage

plot_volcano(
  res,
  pvalue_cutoff,
  foldchange_cutoff,
  max_pvalue = 200,
  radius = 3,
  ggplot = TRUE,
  palette = "RdBu",
  missing = FALSE,
  labelsize = 3,
  ...
)

Arguments

res	Annotated DESeq results table from results_all.
pvalue_cutoff	either a single p-value cutoff on the y-axis or two p-values to label down- and up-regulated genes. The default is 1.3 (corresponding to padj = 0.05) for highcharts and no labels for ggplot.
foldchange_cutoff	either the absolute value of the log2 fold change cutoff or negative and positive fold changes to label genes, default is 2 for highcharts and no labels for ggplot.
max_pvalue	y-axis limit, maximum value on a -10 log10 y-axis scale, the default is 200 (padj < 1e-200), so genes below this cutoff are assigned the maximum p-value.
radius	point size, default 3
ggplot	plot ggplot version, default TRUE
palette	RColorBrewer palette name, vector of colors, or "RdGn" for ggplot
missing	Replace missing gene names with Ensembl IDs
labelsize	label size, default 3
...	other options passed to hc_chart or geom_text_repel

Details

For ggplot, the results should not be sorted by p-value or fold change to avoid stacking close overlapping points. Labels are added using ggrepel, so avoid labeling too many points (200 is the limit).

Value

A highchart or ggplot.

Author(s)

Chris Stubben

Examples

plot_volcano(pasilla$results, pvalue=c(35,25), foldchange=2.5)

HuntsmanCancerInstitute/hciR documentation built on Aug. 20, 2024, 12:22 a.m.