3D organization of chicken genome demonstrates evolutionary conservation of topologically associated domains and highlights unique architecture of erythrocytes’ chromatin [Hi-C]. Gallus gallus

We present the first Hi-C map of non-mammalian vertebrate, Gallus gallus (domestic chicken). We show the presence of TADs in chicken embryonic fibroblast genome, distributed in accordance with gene density, transcriptional activity, and CTCF binding sites localization. In contrast to mammals, where all examined cell types display relatively similar chromatin architecture profile, in mature and immature chicken erythrocytes we identify unique chromatin spatial organization strongly differed from fibroblasts. Comparing mammalian and chicken genome architectures, we provide evidence highlighting evolutionary role of spatial organization and their significance in genome activity and regulation. Overall design: HiC-Seq examination of chromatin contact profiles for 3 cell types.