Generating a Scores Plot From RNA-Seq Data

Question

[robert.flynn.21]

Hi all,

I am working with RNA-Seq data and need to control for a variable which can be measured via HOX gene expression. The study is a simple case/control study with a treated and untreated condition.

I have performed some clustering on the dds object (code below - all written in rstudio) and generated a correlation heatmap of HOX gene expression. However, I would also like to generate a scores plot as is often done following PCA.

I have made an attempt to do so. However, there are two issues:

1. I believe the plot I generated is only clustering samples based on their correlations with two particular samples (MC15pos and MC16pos).

2. As the labels are unwieldy, I would also like to colour the points by the 4 level case_condition variable (i.e. if they are case/control and treated/untreated).

Would you have any suggestions to help my rather poor attempt at plotting this!

Generate and normalise dds object

dds <- DESeqDataSetFromMatrix(counts, meta, design = ~condition)
dds <- estimateSizeFactors(dds)

Perform HOX Clustering (Remove HOXA10-HOXA9 as it has 0 counts)

vst_dds <- vst(dds, blind=TRUE)

vst_mat <- assay(vst_dds)

vst_mat_hox <- vst_mat[grepl("^HOX", row.names(vst_mat)), ]

vst_mat_hox <- vst_mat_hox[row.names(vst_mat_hox) != "HOXA10-HOXA9", ]

vst_cor_hox <- cor(vst_mat_hox)

Generate scores plot

library("pls")
scoreplot(
  vst_cor_hox,
  labels = meta$condition_treatment,
  comps = 1:2,
  identify = FALSE,
  type = "p",
)

Scores plot