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Cell-of-Origin-Specific 3D Genome Structure Acquired during Somatic Cell Reprogramming

Research paper by Peter Hugo Lodewijk Krijger, Bruno Di Stefano, Elzo de Wit, Francesco Limone, Chris van Oevelen, Wouter de Laat, Thomas Graf

Indexed on: 15 Mar '16Published on: 10 Mar '16Published in: Cell Stem Cell



Abstract

Forced expression of reprogramming factors can convert somatic cells into induced pluripotent stem cells (iPSCs). Here we studied genome topology dynamics during reprogramming of different somatic cell types with highly distinct genome conformations. We find large-scale topologically associated domain (TAD) repositioning and alterations of tissue-restricted genomic neighborhoods and chromatin loops, effectively erasing the somatic-cell-specific genome structures while establishing an embryonic stem-cell-like 3D genome. Yet, early passage iPSCs carry topological hallmarks that enable recognition of their cell of origin. These hallmarks are not remnants of somatic chromosome topologies. Instead, the distinguishing topological features are acquired during reprogramming, as we also find for cell-of-origin-dependent gene expression patterns.

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