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ArtikelWhole-Genome Fingerprint of the DNA Methylome During Human B Cell Differentiation  
Oleh: Kulis, Marta ; Merkel, Angelika ; Heath, Simon ; Queiros, Ana C. ; Schuyler, Ronald P. ; Castellano, Giancarlo
Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Nature Genetics vol. 47 no. 07 (Jul. 2015), page 746–756.
Topik: Epigenomics
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  • Perpustakaan FK
    • Nomor Panggil: N12.K
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Isi artikelWe analyzed the DNA methylome of ten subpopulations spanning the entire B cell differentiation program by whole-genome bisulfite sequencing and high-density microarrays. We observed that non-CpG methylation disappeared upon B cell commitment, whereas CpG methylation changed extensively during B cell maturation, showing an accumulative pattern and affecting around 30% of all measured CpG sites. Early differentiation stages mainly displayed enhancer demethylation, which was associated with upregulation of key B cell transcription factors and affected multiple genes involved in B cell biology. Late differentiation stages, in contrast, showed extensive demethylation of heterochromatin and methylation gain at Polycomb-repressed areas, and genes with apparent functional impact in B cells were not affected. This signature, which has previously been linked to aging and cancer, was particularly widespread in mature cells with an extended lifespan. Comparing B cell neoplasms with their normal counterparts, we determined that they frequently acquire methylation changes in regions already undergoing dynamic methylation during normal B cell differentiation.
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