Figure 5

Syntenic arrangement of chicken, medaka, labrid and zebrafish vitellogenin ( vtg ) genes. White boxes represent coding vtgs, while dot-boxes indicate pseudogenes. Data for chicken show the chromosomal loci (Mb) of complete type vtgs together with some of the linked genes. Syntenic data for three-spined stickleback, torafugu and spotted green pufferfish are similar to the medaka [7], and therefore not shown here. The genes are aligned (not to scale) to illustrate orthologies between the vertebrates. Arrows infer the likely direction of duplication or rearrangement. Labrid vtgs are shown on dashed lines since no genomic data are currently available for linkage maps. The ZfVTG1-8 cluster is preliminary oriented according to increasing bp loci and a BLAST hit for the Ssx2ip protein. The rearrangement of the genes to different chromosomes is consistent with their origin in protochromosome m [see [40]]. Linear representations of the sub-domain structures of each type of Vtg are shown for clarity.