Mouse methylome studies SRP296451 Track Settings
 
WGBS on prospermatogonia at E18.5 [Prospermatogonia (Oct4-GFP positive cells sorted by FACS)]

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 SRX9635693  AMR  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635693 (AMR)   Schema 
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 SRX9635693  CpG reads  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635693 (CpG reads)   Schema 
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 SRX9635694  CpG reads  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635694 (CpG reads)   Schema 
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 SRX9635694  CpG methylation  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635694 (CpG methylation)   Schema 
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 SRX9635694  PMD  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635694 (PMD)   Schema 
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 SRX9635695  AMR  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635695 (AMR)   Schema 
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 SRX9635695  CpG reads  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635695 (CpG reads)   Schema 
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 SRX9635695  CpG methylation  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635695 (CpG methylation)   Schema 
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 SRX9635696  AMR  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635696 (AMR)   Schema 
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 SRX9635696  CpG reads  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635696 (CpG reads)   Schema 
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 SRX9635696  CpG methylation  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635696 (CpG methylation)   Schema 
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 SRX9635696  PMD  Prospermatogonia (Oct4-GFP positive cells sorted by FACS) / SRX9635696 (PMD)   Schema 
    

Study title: WGBS on prospermatogonia at E18.5
SRA: SRP296451
GEO: GSE162723
Pubmed: 35410378

Experiment Label Methylation Coverage HMRs HMR size AMRs AMR size PMDs PMD size Conversion Details
SRX9635693 Prospermatogonia (Oct4-GFP positive cells sorted by FACS) 0.680 25.4 93922 2743.1 930 759.9 3792 120244.2 0.939 title: GSM4957995 Wildtype_WGBS_E18-5, Mus musculus, Bisulfite-Seq; {"source_name": "Prospermatogonia E18.5", "strain": "C57BL/6", "sex": "male", "genotype": "Wildtype", "cell_type": "Prospermatogonia (Oct4-GFP positive cells sorted by FACS)"}
SRX9635694 Prospermatogonia (Oct4-GFP positive cells sorted by FACS) 0.650 27.4 97288 3454.8 593 817.3 3749 125922.1 0.944 title: GSM4957996 Dnmt3Cmutant_WGBS_E18-5, Mus musculus, Bisulfite-Seq; {"source_name": "Prospermatogonia E18.5", "strain": "C57BL/6", "sex": "male", "genotype": "Dnmt3Cmutant", "cell_type": "Prospermatogonia (Oct4-GFP positive cells sorted by FACS)"}
SRX9635695 Prospermatogonia (Oct4-GFP positive cells sorted by FACS) 0.198 27.9 5339 19187.2 73 779.6 0 0.0 0.983 title: GSM4957997 Dnmt3Lmutant_WGBS_E18-5, Mus musculus, Bisulfite-Seq; {"source_name": "Prospermatogonia E18.5", "strain": "C57BL/6", "sex": "male", "genotype": "Dnmt3Lmutant", "cell_type": "Prospermatogonia (Oct4-GFP positive cells sorted by FACS)"}
SRX9635696 Prospermatogonia (Oct4-GFP positive cells sorted by FACS) 0.214 31.8 17 270163.4 124 750.3 4 1111919.8 0.981 title: GSM4957998 Dnmt3Amutant_WGBS_E18-5, Mus musculus, Bisulfite-Seq; {"source_name": "Prospermatogonia E18.5", "strain": "C57BL/6", "sex": "male", "genotype": "Dnmt3Amutant", "cell_type": "Prospermatogonia (Oct4-GFP positive cells sorted by FACS)"}

Methods

All analysis was done using a bisulfite sequnecing data analysis pipeline DNMTools developed in the Smith lab at USC.

Mapping reads from bisulfite sequencing: Bisulfite treated reads are mapped to the genomes with the abismal program. Input reads are filtered by their quality, and adapter sequences in the 3' end of reads are trimmed. This is done with cutadapt. Uniquely mapped reads with mismatches/indels below given threshold are retained. For pair-end reads, if the two mates overlap, the overlapping part of the mate with lower quality is discarded. After mapping, we use the format command in dnmtools to merge mates for paired-end reads. We use the dnmtools uniq command to randomly select one from multiple reads mapped exactly to the same location. Without random oligos as UMIs, this is our best indication of PCR duplicates.

Estimating methylation levels: After reads are mapped and filtered, the dnmtools counts command is used to obtain read coverage and estimate methylation levels at individual cytosine sites. We count the number of methylated reads (those containing a C) and the number of unmethylated reads (those containing a T) at each nucleotide in a mapped read that corresponds to a cytosine in the reference genome. The methylation level of that cytosine is estimated as the ratio of methylated to total reads covering that cytosine. For cytosines in the symmetric CpG sequence context, reads from the both strands are collapsed to give a single estimate. Very rarely do the levels differ between strands (typically only if there has been a substitution, as in a somatic mutation), and this approach gives a better estimate.

Bisulfite conversion rate: The bisulfite conversion rate for an experiment is estimated with the dnmtools bsrate command, which computes the fraction of successfully converted nucleotides in reads (those read out as Ts) among all nucleotides in the reads mapped that map over cytosines in the reference genome. This is done either using a spike-in (e.g., lambda), the mitochondrial DNA, or the nuclear genome. In the latter case, only non-CpG sites are used. While this latter approach can be impacted by non-CpG cytosine methylation, in practice it never amounts to much.

Identifying hypomethylated regions (HMRs): In most mammalian cells, the majority of the genome has high methylation, and regions of low methylation are typically the interesting features. (This seems to be true for essentially all healthy differentiated cell types, but not cells of very early embryogenesis, various germ cells and precursors, and placental lineage cells.) These are valleys of low methylation are called hypomethylated regions (HMR) for historical reasons. To identify the HMRs, we use the dnmtools hmr command, which uses a statistical model that accounts for both the methylation level fluctations and the varying amounts of data available at each CpG site.

Partially methylated domains: Partially methylated domains are large genomic regions showing partial methylation observed in immortalized cell lines and cancerous cells. The pmd program is used to identify PMDs.

Allele-specific methylation: Allele-Specific methylated regions refers to regions where the parental allele is differentially methylated compared to the maternal allele. The program allelic is used to compute allele-specific methylation score can be computed for each CpG site by testing the linkage between methylation status of adjacent reads, and the program amrfinder is used to identify regions with allele-specific methylation.

For more detailed description of the methods of each step, please refer to the DNMTools documentation.