HP1 drives de novo 3D genome reorganization in early Drosophila embryos.
Fides ZenkYinxiu ZhanPavel I KosEva LöserNazerke AtinbayevaMelanie SchächtleGuido TianaLuca GiorgettiNicola IovinoPublished in: Nature (2021)
Fundamental features of 3D genome organization are established de novo in the early embryo, including clustering of pericentromeric regions, the folding of chromosome arms and the segregation of chromosomes into active (A-) and inactive (B-) compartments. However, the molecular mechanisms that drive de novo organization remain unknown1,2. Here, by combining chromosome conformation capture (Hi-C), chromatin immunoprecipitation with high-throughput sequencing (ChIP-seq), 3D DNA fluorescence in situ hybridization (3D DNA FISH) and polymer simulations, we show that heterochromatin protein 1a (HP1a) is essential for de novo 3D genome organization during Drosophila early development. The binding of HP1a at pericentromeric heterochromatin is required to establish clustering of pericentromeric regions. Moreover, HP1a binding within chromosome arms is responsible for overall chromosome folding and has an important role in the formation of B-compartment regions. However, depletion of HP1a does not affect the A-compartment, which suggests that a different molecular mechanism segregates active chromosome regions. Our work identifies HP1a as an epigenetic regulator that is involved in establishing the global structure of the genome in the early embryo.
Keyphrases
- genome wide
- single molecule
- copy number
- dna methylation
- high throughput sequencing
- single cell
- gene expression
- rna seq
- molecular dynamics simulations
- transcription factor
- cell free
- circulating tumor
- pregnant women
- oxidative stress
- small molecule
- high throughput
- molecular dynamics
- circulating tumor cells
- amino acid
- pregnancy outcomes