Hi all, I'm interested in locating some genomic positions to genomic locations in terms of intron, exon, UTR end so on. I've read that the locateVariants function can do this; however, for each genomic position there are several rows corresponding to all positions in the different isoforms. How can I locate my genomic positions (in terms of exon, promoter, UTR and so on) only for canonical transcripts, or how can I identify the genomic location corresponding to canonical isoforms? Thank you in advance for your time and help.

You should read the VariantAnnotation vignette to familiarize yourself with how the package works. You will find that open ended questions tend not to get answers, whereas if you have been trying to do something and can provide the code you are using and a specific question you are likely to have somebody provide some help.