ISSN: 1001-0602
EISSN: 1748-7838
2012 impact factor 10.526*
(Thomson Reuters, 2013)
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VOLUME 27 ISSUE 8(8,2017): 967-988

 

Single-cell multi-omics sequencing of mouse early embryos and embryonic stem cells OPEN

 

Fan Guo1,2,3,4,*, Lin Li1,2,*, Jingyun Li1,2,3,5,*, Xinglong Wu1,2,5, Boqiang Hu1,2, Ping Zhu1,2,5, Lu Wen1,2 and Fuchou Tang1,2,3

 

1Beijing Advanced Innovation Center for Genomics, Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing 100871, China;
2Biomedical Institute for Pioneering Investigation via Convergence, Peking University, Beijing 100871, China;
3Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China;
4Group of Translational Medicine, Department of Obstetrics and Gynecology, Ministry of Education Key Laboratory of Obstetric, Gynecologic & Pediatric Diseases and Birth Defects, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, China;
5Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China

Correspondence:Fuchou Tang, E-mail: tangfuchou@pku.edu.cn; Fan Guo,        

E-mail: guofan@scu.edu.cn

 

Single-cell epigenome sequencing techniques have recently been developed. However, the combination of different layers of epigenome sequencing in an individual cell has not yet been achieved. Here, we developed a single-cell multi-omics sequencing technology (single-cell COOL-seq) that can analyze the chromatin state/nucleosome positioning, DNA methylation, copy number variation and ploidy simultaneously from the same individual mammalian cell. We used this method to analyze the reprogramming of the chromatin state and DNA methylation in mouse preimplantation embryos. We found that within < 12 h of fertilization, each individual cell undergoes global genome demethylation together with the rapid and global reprogramming of both maternal and paternal genomes to a highly opened chromatin state. This was followed by decreased openness after the late zygote stage. Furthermore, from the late zygote to the 4-cell stage, the residual DNA methylation is preferentially preserved on intergenic regions of the paternal alleles and intragenic regions of maternal alleles in each individual blastomere. However, chromatin accessibility is similar between paternal and maternal alleles in each individual cell from the late zygote to the blastocyst stage. The binding motifs of several pluripotency regulators are enriched at distal nucleosome depleted regions from as early as the 2-cell stage. This indicates that the cis-regulatory elements of such target genes have been primed to an open state from the 2-cell stage onward, long before pluripotency is eventually established in the ICM of the blastocyst. Genes may be classified into homogeneously open, homogeneously closed and divergent states based on the chromatin accessibility of their promoter regions among individual cells. This can be traced to step-wise transitions during preimplantation development. Our study offers the first single-cell and parental allele-specific analysis of the genome-scale chromatin state and DNA methylation dynamics at single-base resolution in early mouse embryos and provides new insights into the heterogeneous yet highly ordered features of epigenomic reprogramming during this process.

 

10.1038/cr.2017.82

 

keywords:epigenome; single-cell COOL-seq; multi-omics sequencing; mouse preimplantation embryos; reprogramming

 
 
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