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Nucleosomes Shape DNA Polymorphism and Divergence

Journal Article · · PLoS Genetics
 [1];  [2];  [3]
  1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); DOE/OSTI
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
  3. University of California, Davis, CA (United States)
An estimated 80% of genomic DNA in eukaryotes is packaged as nucleosomes, which, together with the remaining interstitial linker regions, generate higher order chromatin structures. Nucleosome sequences isolated from diverse organisms exhibit ,10 bp periodic variations in AA, TT and GC dinucleotide frequencies. These sequence elements generate intrinsically curved DNA and help establish the histone-DNA interface. We investigated an important unanswered question concerning the interplay between chromatin organization and genome evolution: do the DNA sequence preferences inherent to the highly conserved histone core exert detectable natural selection on genomic divergence and polymorphism? To address this hypothesis, we isolated nucleosomal DNA sequences from Drosophila melanogaster embryos and examined the underlying genomic variation within and between species. We found that divergence along the D. melanogaster lineage is periodic across nucleosome regions with base changes following preferred nucleotides, providing new evidence for systematic evolutionary forces in the generation and maintenance of nucleosome-associated dinucleotide periodicities. Further, Single Nucleotide Polymorphism (SNP) frequency spectra show striking periodicities across nucleosomal regions, paralleling divergence patterns. Preferred alleles occur at higher frequencies in natural populations, consistent with a central role for natural selection. These patterns are stronger for nucleosomes in introns than in intergenic regions, suggesting selection is stronger in transcribed regions where nucleosomes undergo more displacement, remodeling and functional modification. In addition, we observe a large-scale (~180 bp) periodic enrichment of AA/TT dinucleotides associated with nucleosome occupancy, while GC dinucleotide frequency peaks in linker regions. Divergence and polymorphism data also support a role for natural selection in the generation and maintenance of these super-nucleosomal patterns. Our results demonstrate that nucleosome-associated sequence periodicities are under selective pressure, implying that structural interactions between nucleosomes and DNA sequence shape sequence evolution, particularly in introns.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1627306
Journal Information:
PLoS Genetics, Journal Name: PLoS Genetics Journal Issue: 7 Vol. 10; ISSN 1553-7404
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (13)

Patterns of Genetic Variability in Genomic Regions with Low Rates of Recombination journal January 2020
Human exonization through differential nucleosome occupancy journal August 2018
Rates and Patterns of Mutation in Tandem Repetitive DNA in Six Independent Lineages of Chlamydomonas reinhardtii journal June 2018
Chromatin structure is distinct between coding and non-coding single nucleotide polymorphisms journal January 2014
Associations between nucleosome phasing, sequence asymmetry, and tissue-specific expression in a set of inbred Medaka species journal November 2015
Evidence of selection for an accessible nucleosomal array in human journal July 2016
TRX-LOGOS - a graphical tool to demonstrate DNA information content dependent upon backbone dynamics in addition to base sequence journal September 2015
Extremely low nucleotide diversity in the X-linked region of papaya caused by a strong selective sweep journal November 2016
Increasing Nucleosome Occupancy Is Correlated with an Increasing Mutation Rate so Long as DNA Repair Machinery Is Intact journal August 2015
Effects of DNA Methylation and Chromatin State on Rates of Molecular Evolution in Insects journal February 2016
New insights into structural features and optimal detection of circulating tumor DNA determined by single-strand DNA analysis journal November 2018
Patterns of genetic variability in genomic regions with low rates of recombination posted_content August 2019
Purifying Selection, Drift, and Reversible Mutation with Arbitrarily High Mutation Rates journal September 2014

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