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Chromatin structure is distinct between coding and non-coding single nucleotide polymorphisms.


ABSTRACT: BACKGROUND: Previous studies suggested that nucleosomes are enriched with single nucleotide polymorphisms (SNPs) in humans and that the occurrence of mutations is closely associated with CpG dinucleotides. We aimed to determine if the chromatin organization is genomic locus specific around SNPs, and if newly occurring mutations are associated with SNPs. RESULTS: Here, we classified SNPs according their loci and investigated chromatin organization in both CD4+ T cell and lymphoblastoid cell in humans. We calculated the SNP frequency around somatic mutations. The results indicated that nucleosome occupancy is different around SNPs sites in different genomic loci. Coding SNPs are mainly enriched at nucleosomes and associated with repressed histone modifications (HMs) and DNA methylation. Contrastingly, intron SNPs occur in nucleosome-depleted regions and lack HMs. Interestingly, risk-associated non-coding SNPs are also enriched at nucleosomes with HMs but associated with low GC-content and low DNA methylation level. The base-transversion allele frequency is significantly low in coding-synonymous SNPs (P?

SUBMITTER: Liu H 

PROVIDER: S-EPMC4193957 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Chromatin structure is distinct between coding and non-coding single nucleotide polymorphisms.

Liu Hongde H   Zhai Jinchen J   Luo Kun K   Liu Lingjie L  

BMC molecular biology 20141005


<h4>Background</h4>Previous studies suggested that nucleosomes are enriched with single nucleotide polymorphisms (SNPs) in humans and that the occurrence of mutations is closely associated with CpG dinucleotides. We aimed to determine if the chromatin organization is genomic locus specific around SNPs, and if newly occurring mutations are associated with SNPs.<h4>Results</h4>Here, we classified SNPs according their loci and investigated chromatin organization in both CD4+ T cell and lymphoblasto  ...[more]

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