Heatmap of zenith results using ggplot2

Heatmap of zenith results showing genesets that have the top and bottom t-statistics from each assay.

Usage

plotZenithResults(
  df,
  ntop = 5,
  nbottom = 5,
  label.angle = 45,
  zmax = NULL,
  transpose = FALSE,
  sortByGeneset = TRUE
)

Arguments

df

result data.frame from zenith_gsa

ntop

number of gene sets with highest t-statistic to show

nbottom

number of gene sets with lowest t-statistic to show

label.angle

angle of x-axis label

zmax

maxium of the color scales. If not specified, used range of the observed t-statistics

transpose

transpose the axes of the plot

sortByGeneset

use hierarchical clustering to sort gene sets. Default is TRUE

Value

Heatmap showing enrichment for gene sets and cell types

Examples

# Load packages
library(edgeR)
library(variancePartition)
#> Loading required package: ggplot2
#> Loading required package: BiocParallel
#> 
#> Attaching package: ‘variancePartition’
#> The following object is masked from ‘package:limma’:
#> 
#>     topTable
library(tweeDEseqCountData)

# Load RNA-seq data from LCL's
data(pickrell)
geneCounts = exprs(pickrell.eset)
df_metadata = pData(pickrell.eset)

# Filter genes
# Note this is low coverage data, so just use as code example
dsgn = model.matrix(~ gender, df_metadata)
keep = filterByExpr(geneCounts, dsgn, min.count=5)

# Compute library size normalization
dge = DGEList(counts = geneCounts[keep,])
dge = calcNormFactors(dge)

# Estimate precision weights using voom
vobj = voomWithDreamWeights(dge, ~ gender, df_metadata)

# Apply dream analysis
fit = dream(vobj, ~ gender,df_metadata)
fit = eBayes(fit)

# Load Hallmark genes from MSigDB
# use gene 'SYMBOL', or 'ENSEMBL' id
# use get_GeneOntology() to load Gene Ontology
gs = get_MSigDB("H", to="ENSEMBL")
   
# Run zenith analysis
res.gsa = zenith_gsa(fit, gs, 'gendermale', progressbar=FALSE )

# Show top gene sets
head(res.gsa, 2)
#>                                              coef
#> M5890_HALLMARK_TNFA_SIGNALING_VIA_NFKB gendermale
#> M5892_HALLMARK_CHOLESTEROL_HOMEOSTASIS gendermale
#>                                                                       Geneset
#> M5890_HALLMARK_TNFA_SIGNALING_VIA_NFKB M5890_HALLMARK_TNFA_SIGNALING_VIA_NFKB
#> M5892_HALLMARK_CHOLESTEROL_HOMEOSTASIS M5892_HALLMARK_CHOLESTEROL_HOMEOSTASIS
#>                                        NGenes Correlation      delta        se
#> M5890_HALLMARK_TNFA_SIGNALING_VIA_NFKB    118        0.01 -0.9999389 0.1621467
#> M5892_HALLMARK_CHOLESTEROL_HOMEOSTASIS     37        0.01 -1.0915363 0.2296170
#>                                              p.less p.greater       PValue
#> M5890_HALLMARK_TNFA_SIGNALING_VIA_NFKB 2.268956e-08 1.0000000 4.537911e-08
#> M5892_HALLMARK_CHOLESTEROL_HOMEOSTASIS 5.493684e-06 0.9999945 1.098737e-05
#>                                        Direction          FDR
#> M5890_HALLMARK_TNFA_SIGNALING_VIA_NFKB      Down 2.132818e-06
#> M5892_HALLMARK_CHOLESTEROL_HOMEOSTASIS      Down 2.582032e-04

# for each cell type select 3 genesets with largest t-statistic
# and 1 geneset with the lowest
# Grey boxes indicate the gene set could not be evaluted because
#    to few genes were represented
plotZenithResults(res.gsa)