3D organization of chicken genome demonstrates evolutionary conservation
to extreme environments
Abstract
High-through chromosome conformation capture (Hi-C) technique is widely
used to study the functional roles of the three-dimensional (3D) genome
architecture of genomes. However, knowledge of 3D genome structure and
its dynamic during extreme environments adaption remain poor. Here we
characterized 3D genome architectures with Hi-C technique for chicken
liver cells. By comparing Lindian chicken (LDC) liver cells with
Wenchang chicken (WCC) liver cells, we discovered that environmental
adaption contributed to the switching of A/B compartments, the
reorganization of topologically associated domains (TADs) and TAD
boundaries in both liver cells. Besides, analysis of the switching of
A/B compartments combined with liver transcriptome revealed the
corresponding changes of gene expression were strongly associated with
extreme environment adaption-related pathways, including Tight junction,
Notch signaling pathway, Vascular smooth muscle contraction, RIG-I-like
receptor signaling pathway and Glycosphingolipid biosynthesis pathways.
This study advanced our understanding of evolutionary role of chicken 3D
genome architecture and their significance in genome activity and
transcriptional regulation.