Hi,

Is it possible to change the parameters of col, lty, lwd, and fontcolor.exon within a GeneRegionTrack for one specific exon of a gene? I have multiple transcripts of a gene and they differ in the inclusion of one exon. I would like to highlight this, but it only seems to be possible by changing the fill color. From the user guide it seems like this is not possible, but I was wondering whether there were any work arounds?

  gene_track <- GeneRegionTrack(
    gene_transcripts,
    chromosome         = seq_name,
    name               = "gene isoforms",
    strand             = "+",
    transcript         = gene_transcripts$transcript,
    group              = "group",
    exonAnnotation     = "exon",
    transcriptAnnotation = "transcript",

    cex.group          = cex_transcript_labels,
    just.group         = "right",
    fontcolor.group    = "#424949",

    stacking           = "pack",   
    mergeGroups        = FALSE,
    collapse           = FALSE,

    col                = default_border_col,
    lwd                = default_line_width,
    fontcolor.exon     = default_font_col,
    fontface.exon      = 2,
    cex.feature        = cex_exon_names,

    background.title               = "#565656",
    background.panel               = "#FAFAFA",
    col.border.title               = "#FAFAFA",
    frame                          = TRUE,
    col.frame                      = "#a0a7a8",
    col.title                      = "white",
    cex.title                      = cex_track_names
  )


  exon_colors <- setNames(
    ifelse(gene_transcripts$exon == "exon_X", eX_exon_col, default_exon_col),
    gene_transcripts$exon
  )

  displayPars(gene_track) <- list(fill = exon_colors)