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Chromatin structure dynamics during human cardiomyocyte differention reveals a role of HERV-H in demarcating TAD boundaries.

ABSTRACT: The three-dimensional chromatin architecture plays a critical role in the establishment of cell-type-specific gene regulatory networks in eukaryotic cells. How pluripotent stem cells (PSC) alter their chromatin architecture to direct cell fate specification remains to be elucidated. Here, using a human PSC cardiomyocyte differentiation model, we analyze the dynamic reorganization of chromatin structure and gene regulatory networks during key transitional stages of cardiomyocyte development. We show that many human PSC-specific topologically associating domains (TADs) are driven by active transcription of the primate-specific retroviruses HERVH. These HERVH are silenced at the earliest stages of differentiation , accompanied by loss of TAD borders and subsequent merging of cognate TADs during differentiation, which leads to repression of gene expression within these domains . In line with these findings, deletion of select HERVHs results in elimination of corresponding TAD boundaries in human PSCs. We further discovered developmental stage-specific chromatin loop interactions that predict target genes of cardiac-related trait/disease non-coding genetic variants. Overall, our results not only highlight a novel role for endogenous retroviruses in shaping species-specific PSC chromatin architecture during evolution but also provide a genomic blueprint for understanding the impact of non-coding variants in congenital and adult heart disease/traits.

ORGANISM(S): Callithrix jacchus Pan paniscus Homo sapiens Pan troglodytes

PROVIDER: GSE116862 | GEO | 2019/07/09

REPOSITORIES: GEO

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Project description:Three-dimensional genome structure plays an important role in gene regulation. Globally chromosomes are organized into active and inactive compartments, while at the gene level looping interactions connect promoters to regulatory elements. Topologically Associating Domains (TADs), typically several hundred kilobases in size form an intermediate level of organization. Major questions include how TADs are formed and what their relation is with looping interactions between genes and regulatory elements. Here we performed a focused 5C analysis of a 2.8 Mb region on chromosome 7 surrounding CFTR in a panel of cell types. We find that the same TAD boundaries are present in all cell types, indicating that TADs represent a universal chromosome architecture. Further, we find that these TAD boundaries are present irrespective of expression and looping of genes located between them. In contrast looping interactions between promoters and regulatory elements are cell-type specific and occur mostly within TADs. This is exemplified by the CFTR promoter that in different cell types interacts with distinct sets of distal cell type-specific regulatory elements that are all located within the same TAD. Finally, we find that long-range associations between loci located in different TADs are also detected but these display much lower interaction frequencies than looping interactions within TADs. Interestingly, interactions between TADs are also highly cell type-specific and often involve loci clustered around TAD boundaries. These data point to key roles of invariant TAD boundaries in constraining as well as mediating cell type-specific long-range interactions and gene regulation. We investigated a 2.8 Mb region on Chromosome 7 (hg18 chr7: 115797757-118405450) containing the ENCODE region ENm001 42. The 5C experiment was designed to interrogate looping interactions between HindIII fragments containing transcription start sites (TSSs) and any other HindIII restriction fragment (distal fragments) in the target region. Libraries were generated for five cell lines: Caco2, Calu3, Capan1, GM12878 and HepG2, with two biological replicates for each line. 5C probes were designed at HindIII restriction sites (AAGCTT) using 5C primer design tools previously developed and made publicly available online at our My5C website (http://my5C.umassmed.edu). Probes were designed based on the ENCODE manual region 1 (ENM001) design 25 with additional probes placed throughout the region when appropriate. We also added probes to extend the analysis to include a 700 Kb gene desert region located directly adjacent to ENM001. Probe settings were: U-BLAST, 3; S-BLAST, 100; 15-MER, 3,000; MIN_FSIZE, 250; MAX_FSIZE, 20,000; OPT_TM, 65; OPT_PSIZE, 40. We designed 74 reverse 5C probes, and 605 forward 5C probes.

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Chromatin structure dynamics during human cardiomyocyte differention reveals a role of HERV-H in demarcating TAD boundaries.

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