The gene model used as a reference across GDC has been updated from GENCODE 22 to GENCODE 36. GENCODE gene sets are continuously updated to improve the coverage and accuracy. GENCODE 36, which was released in October of 2020, includes many updates to definitions of genes, transcripts, long non-coding RNAs, and other types of annotations. The previous version used by the GDC (GENCODE 22) was released in March 2015. Both versions were built on Ensembl genome assembly GRCh38.
For details about this release, please visit the GDC Data Release Notes.