Developing markers using comparative mapping data. Screenshot of GGA21 from the Narcisse database (http://narcisse.toulouse.inra.fr/pre-narcisse/duck/cgi-bin/narcisse.cgi webcite). Right: GGA21, with gene names. Left: white cylinders represent duck scaffolds or portions of duck scaffolds aligned to the chicken genome. Grey and green arrows represent portions of conserved synteny between the chicken chromosome and the duck scaffolds and their orientation. Left: names of the markers developed for RH mapping. For large scaffolds, such as sca148, one marker every 500 kb was developed to ensure RH linkage by optimizing inter-marker distances. Red: scaffold246 and green: scaffold871. These two scaffolds each seem to be split in chicken into three and two different regions respectively. At least one marker per region was developed, so as to check duck scaffold integrity.
Rao et al. BMC Genomics 2012 13:513 doi:10.1186/1471-2164-13-513