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Chromatin and Sequence Features that Define the Fine and Gross Structure of Genomics Methylation Patterns

ABSTRACT: Chromatin and Sequence Features that Define the Fine and Gross Structure of Genomics Methylation Patterns

PROVIDER: PRJNA126517 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR063391_1.fastq.gz	Fastqsanger.gz
	SRR063391_2.fastq.gz	Fastqsanger.gz
	SRR063392_1.fastq.gz	Fastqsanger.gz
	SRR063392_2.fastq.gz	Fastqsanger.gz
	SRR063393_1.fastq.gz	Fastqsanger.gz

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Chromatin and Sequence Features that Define the Fine and Gross Structure of Genomics Methylation Patterns

Project description:We report a new method for genome-wide methylation profiling that is able to probe methylation status in both single-copy DNA and interspersed repeats. This method, MethylMAPS, uses methylation-sensitive and -dependent enzymes to fractionate the genome according to methylation state. Methylated and unmethylated fragments are then sequenced with Next-Gen sequencing to map methylated and unmethylated CpG sites in the genome. We have used this method to determine the methylation status of >275 million CpG sites in human and mouse DNA from breast and brain tissues. We conclude that methylation is the default state of most CpG dinucleotides and that a combination of local dinucleotide frequencies, the interaction of repeated sequences, and the presence or absence of histone variants or modifications shields a population of CpG sites (most of which are in and around promoters) from DNA methyltransferases that lack intrinsic sequence specificity.

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Chromatin and sequence features that define the fine and gross structure of genomic methylation patterns.

Project description:Abnormalities of genomic methylation patterns are lethal or cause disease, but the cues that normally designate CpG dinucleotides for methylation are poorly understood. We have developed a new method of methylation profiling that has single-CpG resolution and can address the methylation status of repeated sequences. We have used this method to determine the methylation status of >275 million CpG sites in human and mouse DNA from breast and brain tissues. Methylation density at most sequences was found to increase linearly with CpG density and to fall sharply at very high CpG densities, but transposons remained densely methylated even at higher CpG densities. The presence of histone H2A.Z and histone H3 di- or trimethylated at lysine 4 correlated strongly with unmethylated DNA and occurred primarily at promoter regions. We conclude that methylation is the default state of most CpG dinucleotides in the mammalian genome and that a combination of local dinucleotide frequencies, the interaction of repeated sequences, and the presence or absence of histone variants or modifications shields a population of CpG sites (most of which are in and around promoters) from DNA methyltransferases that lack intrinsic sequence specificity.

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