Why do some dbVar variants have >1 location?
There are two reasons: When a submitter gives us data on an assembly obtained from UCSC, we translate this into native assembly coordinates and map sequences (chromosomes and unplaced/unlocalized sequences) to their accession.versions. UCSC concatenates unplaced/unlocalized sequences into pseudo-scaffold objects they call chr*_random. In some cases, submitters have provided data that cross gaps on the ‘chr*_random’ sequences, meaning that the feature actually maps to two different, unrelated sequences. More than one location may also be provided if the variant is the result of a transposition event. In this case, coordinates from both the donor and recipient sites are provided, to retain as much information about the variant event as possible.
