The direction of a single exon gene

[rejo27]

Dear Gviz team:
I have a small question about drawing gene tracks. If the gene I want to draw has only one exon (no introns), how can I know its direction?

For example, gene1-4 in the figure.
Looking forward to your reply.

[ivanek]

Hi @rejo27 ,

Essentially you can follow the vignette:

plotTracks(grtrack, collapseTranscripts = TRUE, shape = "arrow", 
           transcriptAnnotation = "symbol")

or

plotTracks(grtrack, collapseTranscripts = "meta", shape = "arrow", 
           transcriptAnnotation = "symbol")

Hope that helps.

[rejo27]

Dear Gviz team:
Thanks for your reply!
I tried your suggestion and got the final gene structure. Although I can get the direction of a single exon gene, it loses the UTR information (gene2 track). I also tried to modify the code, but it seems that there is an arrow for each exon (gene3), which is not ideal. I want to achieve the effect of only displaying the arrow on the last exon without losing the UTR information, that is, the effect in the red box. Do you think such information can be achieved?

Looking forward to your reply.