NDLI: Coding DNA repeated throughout intergenic regions of the Arabidopsis thaliana genome: evolutionary footprints of RNA silencing

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Molecular BioSystems Vol - 5 Issue - 9

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Molecular BioSystems Vol -2

Coding DNA repeated throughout intergenic regions of the Arabidopsis thaliana genome: evolutionary footprints of RNA silencing

Content Provider	Royal Society of Chemistry (RSC)
Author	Naiman, Daniel Q. Cooper, Bret Feng, Jian
Copyright Year	2009
Abstract	Pyknons are non-random sequence patterns significantly repeated throughout non-coding genomicDNA that also appear at least once among coding genes. They are interesting because they portend an unforeseen connection between coding and non-coding DNA. Pyknons have only been discovered in the human genome, so it is unknown whether pyknons have wider biological relevance or are simply a phenomenon of the human genome. To address this, DNA sequence patterns from the Arabidopsis thalianagenome were detected using a probability-based method. 24 654 statistically significant sequence patterns, 16 to 24 nucleotides long, repeating 10 or more times in non-coding DNA also appeared in 46% of A. thalianaprotein-coding genes. A. thaliana pyknons exhibit features similar to human pyknons, including being distinct sequence patterns, having multiple instances in genes and having remarkable similarity to small RNA sequences with roles in gene silencing. Chromosomal position mapping revealed that genomic pyknon density has concordance with siRNA and transposable element positioning density. Because the A. thaliana and human genomes have approximately the same number of genes but drastically different amounts of non-coding DNA, these data reveal that pyknons represent a biologically important link between coding and non-coding DNA. Because of the association of pyknons with siRNAs and localization to silenced regions of heterochromatin, we postulate that RNA-mediated gene silencing leads to the accumulation of gene sequences in non-coding DNA regions.
Starting Page	1679
Ending Page	1687
Page Count	9
File Format	HTM / HTML PDF
ISSN	1742206X
Volume Number	5
Issue Number	12
Journal	Molecular BioSystems
DOI	10.1039/b903031j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Noncoding DNA Arabidopsis thaliana Heterochromatin Human genome RNA Gene DNA Small interfering RNA Transposable element
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Biotechnology

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