Syntenic comparison of two regions from the genome of Arabidopsis thaliana. This genome underwent a whole genome duplication event which created a copy of every genomic region. Over evolutionary time, many of the duplicated genes were lost by a process known as fractionation
. However, many duplicated genes have been retained in duplicate and their collinear arrangement in the genome is evidence for synteny.
Syntenic gene pairs are pairs (or sets) of genes that are from syntenic genomic regions and are present in each syntenic region. Since syntenic regions are often identified by a collinear arrangement of genes (or other genomic features) in two or more genomic regions, the collinear genes used in this inference are syntenic gene pairs.