Unknown,Transcriptomics,Genomics,Proteomics

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The DNA methylation landscape of human early embryos

ABSTRACT: Our data provided a genome-wide DNA methylation landscape of human early development embryos, including human MII oocytes, sperm, zygotes, 2-cell to 8-cell embryos, morula, blastocyst and postimplantation embryos at single base resolution. In total, 44 samples including biological and technical replicates, from 12 different human embryo development stages were analyzed, including two metaphase II oocytes, two zygotes, three first polar bodies, two second polar bodies, four sperm samples, two 2-cell-stage embryos, two 4-cell-stage embryos, three 8-cell-stage embryos, three morulae, three inner cell masses (ICMs) and three trophectoderms (TEs) seperated from late blastocysts, and three post-implantation embryos. In addition, 12 different human embryo development stages were analyzed, including metaphase II oocytes, zygotes, first polar bodies, second polar bodies, sperm samples, 2-cell-stage embryos, 4-cell-stage embryos, 8-cell-stage embryos, morulae, inner cell masses (ICMs) and trophectoderms (TEs) seperated from late blastocysts, and post-implantation embryos.

ORGANISM(S): Homo sapiens

SUBMITTER: Hongshan Guo

PROVIDER: E-GEOD-49828 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

The DNA methylation landscape of human early embryos.

Guo Hongshan H Zhu Ping P Yan Liying L Li Rong R Hu Boqiang B Lian Ying Y Yan Jie J Ren Xiulian X Lin Shengli S Li Junsheng J Jin Xiaohu X Shi Xiaodan X Liu Ping P Wang Xiaoye X Wang Wei W Wei Yuan Y Li Xianlong X Guo Fan F Wu Xinglong X Fan Xiaoying X Yong Jun J Wen Lu L Xie Sunney X SX Tang Fuchou F Qiao Jie J

Nature 20140723 7511

DNA methylation is a crucial element in the epigenetic regulation of mammalian embryonic development. However, its dynamic patterns have not been analysed at the genome scale in human pre-implantation embryos due to technical difficulties and the scarcity of required materials. Here we systematically profile the methylome of human early embryos from the zygotic stage through to post-implantation by reduced representation bisulphite sequencing and whole-genome bisulphite sequencing. We show that ...[more]

PMID: 25079557

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Project description:RNA transcripts are distributed non-uniformly in the oocytes of many animals, such that newly-divided embryo cells (blastomeres) inherit distinct transcriptomes following fertilization. In animals such as the frog, Xenopus laevis, programmed transcript regionalization directs early embryonic axis formation and is essential for normal development. However, it is unknown whether such transcriptome asymmetry directs embryogenesis in mammals, or indeed, whether it occurs at all. We here address this by transcript profiling of matching sub-cellular structures and single cells in mouse oocytes and early embryos and analytical strategies exploiting the paired data structure. Spindle samples contained a set of transcripts that was distinguishable from that of the unfertilized metaphase II (mII) oocytes from which each spindle was microsurgically dissected. Immediately following fertilization, cytokinesis produces a 1-cell embryo (zygote) and associated spindle-enriched second polar body (Pb2) whose transcript profiles also differed one from the other, partially reflecting the enrichment of spindle-associated transcripts. Non-uniform transcript distribution within zygotes did not lead to programmed transcriptome asymmetry between the blastomeres of nascent two-cell embryos, or between the second mitotic products of 3-cell embryos. These findings suggest that mammalian oocytes and zygotes exhibit transcript regionalization without subsequent transcriptome asymmetries between respective early mitotic products. This contrasts the situation in Xenopus and places constraints on the ability of maternal transcriptomic prepatterning to prescribe early mammalian development. 16 Zygote vs. Polar body pairs, 10 spindle vs. oocyte pairs, 22 2-cell embryos and 8 3-cell embryos were analysed. Although the raw data are two channel, only the Cy5 signal of each file was analyzed. The Cy5 channel for each gene is normalized to the average Cy5 intensity of the gene across all samples.

Dataset Information

The DNA methylation landscape of human early embryos

Publications

The DNA methylation landscape of human early embryos.

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