addMotifAnnotation {RcisTarget} | R Documentation

## Add motif annotation

### Description

Select significant motifs and/or annotate motifs to genes or transcription factors. The motifs are considered significantly enriched if they pass the the Normalized Enrichment Score (NES) threshold.

### Usage

    addMotifAnnotation(auc, nesThreshold = 3, digits = 3,
      motifAnnot = NULL, motifAnnot_highConfCat = c("directAnnotation",
      "inferredBy_Orthology"),
      motifAnnot_lowConfCat = c("inferredBy_MotifSimilarity",
      "inferredBy_MotifSimilarity_n_Orthology"), highlightTFs = NULL)

### Arguments

`auc` | Output from calcAUC.
`nesThreshold` | Numeric. NES threshold to calculate the motif significant (3.0 by default). The NES is calculated -for each motif- based on the AUC distribution of all the motifs for the gene-set [(x-mean)/sd].
`digits` | Integer. Number of digits for the AUC and NES in the output table.
`motifAnnot` | Motif annotation database containing the annotations of the motif to transcription factors. The names should match the ranking column names.
`motifAnnot_highConfCat` | Categories considered as source for 'high confidence' annotations. By default, "directAnnotation" (annotated in the source database), and "inferredBy_Orthology" (the motif is annotated to an homologous/ortologous gene).
`motifAnnot_lowConfCat` | Categories considered 'lower confidence' source for annotations. By default, the annotations inferred based on motif similarity ("inferredBy_MotifSimilarity", "inferredBy_MotifSimilarity_n_Orthology").
`highlightTFs` | Character. If a list of transcription factors is provided, the column TFinDB in the otuput table will indicate whether any of those TFs are included within the 'high-confidence' annotation (two asterisks, **) or 'low-confidence' annotation (one asterisk, *) of the motif. The vector can be named to indicate which TF to highlight for each gene-set. Otherwise, all TFs will be used for all geneSets.

### Value

`data.table` with the folowing columns:

- geneSet: Name of the gene set

- motif: ID of the motif (colnames of the ranking, it might be other kind of feature)

- NES: Normalized enrichment score of the motif in the gene-set

- AUC: Area Under the Curve (used to calculate the NES)

- TFinDB: Indicates whether the highlightedTFs are included within the high-confidence annotation (two asterisks, **) or lower-confidence annotation (one asterisk, *)

- TF_highConf: Transcription factors annotated to the motif based on high-confidence annotations.

- TF_lowConf: Transcription factors annotated to the motif according to based on lower-confidence annotations.

### See Also

Next step in the workflow: `addSignificantGenes`.

Previous step in the workflow: `calcAUC`.

See the package vignette for examples and more details: `vignette("RcisTarget")`

### Examples

    ##################################################
    # Setup & previous steps in the workflow:

    #### Gene sets
    # As example, the package includes an Hypoxia gene set:
    txtFile <- paste(file.path(system.file('examples', package='RcisTarget')),
                     "hypoxiaGeneSet.txt", sep="/")
    geneLists <- list(hypoxia=read.table(txtFile, stringsAsFactors=FALSE)[,1])

    #### Databases
    ## Motif rankings: Select according to organism and distance around TSS
    ## (See the vignette for URLs to download)
    # motifRankings <- importRankings("hg19-500bp-upstream-7species.mc9nr.feather")

    ## For this example we will use a SUBSET of the ranking/motif databases:
    library(RcisTarget.hg19.motifDBs.cisbpOnly.500bp)
    data(hg19_500bpUpstream_motifRanking_cispbOnly)
    motifRankings <- hg19_500bpUpstream_motifRanking_cispbOnly

    ## Motif - TF annotation:
    data(motifAnnotations_hgnc) # human TFs (for motif collection 9)
    motifAnnotation <- motifAnnotations_hgnc

    ### Run RcisTarget
    # Step 1. Calculate AUC
    motifs_AUC <- calcAUC(geneLists, motifRankings)

    ##################################################

    ### (This step: Step 2)
    # Before starting: Setup the paralell computation
    library(BiocParallel); register(MulticoreParam(workers = 2))
    # Select significant motifs, add TF annotation & format as table
    motifEnrichmentTable <- addMotifAnnotation(motifs_AUC,
                                               motifAnnot=motifAnnotation)

    # Alternative: Modifying some options
    motifEnrichment_wIndirect <- addMotifAnnotation(motifs_AUC, nesThreshold=2,
            motifAnnot=motifAnnotation,
            highlightTFs = "HIF1A",
            motifAnnot_highConfCat=c("directAnnotation"),
            motifAnnot_lowConfCat=c("inferredBy_MotifSimilarity",
                                    "inferredBy_MotifSimilarity_n_Orthology",
                                    "inferredBy_Orthology"),
            digits=3)

    # Getting TFs for a given TF:
    motifs <- motifEnrichmentTable$motif[1:3]

    getMotifAnnotation(motifs, motifAnnot=motifAnnotation)
    getMotifAnnotation(motifs, motifAnnot=motifAnnotation, returnFormat="list")

    ### Exploring the output:
    # Number of enriched motifs (Over the given NES threshold)
    nrow(motifEnrichmentTable)

    # Interactive exploration
    motifEnrichmentTable <- addLogo(motifEnrichmentTable)
    DT::datatable(motifEnrichmentTable, filter="top", escape=FALSE,
                  options=list(pageLength=50))
    # Note: If using the fake database, the results of this analysis are meaningless

    # The object returned is a data.table (for faster computation),
    # which has a diferent syntax from the standard data.frame or matrix
    # Feel free to convert it to a data.frame (as.data.frame())
    motifEnrichmentTable[,1:6]

    ##################################################
    # Next step (step 3, optional):
    ## Not run:
      motifEnrichmentTable_wGenes <- addSignificantGenes(motifEnrichmentTable,
                                                         geneSets=geneLists,
                                                         rankings=motifRankings,
                                                         method="aprox")

    ## End(Not run)

[Package RcisTarget version 1.4.0 Index]