how to set zorder for volcano plot

Question

[arshad1292]

Hello,

I have generated a volcano plot that has 4 groups (significant, not-significant , tumor_suppressor and marker) with three different colors of dots (all circles). I have only 10 genes in the marker list but they are sent to the background (by default) and its hard to see them. I want to bring them on the front by setting up "zorder" but I don't know how to do it.

Could any expert here please write a script to bring marker on the front and send significant and not-significant in the background?

Many thanks in advance!