Utility Function to Add Annotation to existing ExpressionSet Objects
Adds appropriate featureData, similar to the metadata added in the pipeline script, to the ExpressionSet object.
ExpressionSet object for to which one wants to add additional annotation information
Annotation Library to use. Must be specified when working with Entrez gene IDs.
In this case, one can make use of the JnJ annotation packages such as
Slots of featureData(a4ALL) are
Entrez ID~: Entrez ID as retrieved from annotation package
Ensembl ID~: Ensembl ID as retrieved from annotation package
Gene Symbol~: Gene symbol as retrieved from annotation package
Description~: Description as retrieved from annotation package
a new ExpressionSet object with the additional information stored as feature data
One should always use subscripting of featureData by column name
featureData(a4ALL)$`Entrez ID`; as the pipeline
ExpressionSets have one additional column compared to the ExpressionSet
objects produced by
addGeneInfo, i.e. column 2 of the pipeline ExpressionSets
corresponds to column one of an
Tobias Verbeke, Steven Osselaer
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