The genePred table formats can be used to specify the gene track annotations for an imported genome.
Several variations of the genePred table format are described in the FAQ titled “genePred table format” on the UCSC Genome Browser web site: http://genome.ucsc.edu/FAQ/FAQformat#format9. Downloading gene information from any of these tables creates a tab-delimited text file where the columns in the file match the columns in the table. Downloaded files may be zipped with a .txt.gz extension. Such a zipped file can be used to specify the gene track annotations for an imported genome. IGV looks for specific string in the filename (case insensitive) to identify the file format: