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Related Concept Videos

Gene Evolution - Fast or Slow?02:05

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Targeted DNA Methylation Analysis by Next-generation Sequencing
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Relating gene expression evolution with CpG content changes.

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  • 1HB7400, Remsen 702, Department of Genetics, Geisel School of Medicine at Dartmouth, Hanover NH 03755, USA. chao.cheng@dartmouth.edu.

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Summary
This summary is machine-generated.

Gene expression evolution is linked to changes in normalized CpG (nCpG) content near gene start and end sites. Alterations in nCpG levels correlate with gene expression changes across species.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • CpG dinucleotides are enriched in promoters and correlate with gene expression.
  • The relationship between CpG content divergence and gene expression evolution remains understudied.

Purpose of the Study:

  • To investigate the relationship between normalized CpG (nCpG) content divergence and gene expression evolution.
  • To analyze nCpG content in promoter and terminator regions across nine organisms and correlate it with gene expression levels.

Main Methods:

  • Calculated normalized CpG (nCpG) content in regions around transcription start sites (TSS) and transcription terminal sites (TTS) for nine species.
  • Utilized RNA-sequencing data to measure gene expression levels.
  • Compared nCpG content distributions and evolutionary patterns between TSS and TTS regions.

Main Results:

  • nCpG content at TSS showed a bimodal distribution in most species, while TTS content had a single peak.
  • TSS nCpG content diverged faster between closely related species but was more conserved between distant ones compared to TTS.
  • Changes in gene expression (up/down-regulation) were associated with corresponding increases/decreases in nCpG content near TSS and TTS.

Conclusions:

  • Gene expression evolution across organisms is correlated with changes in promoter-proximal normalized CpG content.
  • Evidence suggests that normalized CpG content plays a role in shaping gene expression evolution.