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2015 ; 8
(ä): 46
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English Wikipedia
RNA:DNA hybrids in the human genome have distinctive nucleotide characteristics,
chromatin composition, and transcriptional relationships
#MMPMID26579211
Nadel J
; Athanasiadou R
; Lemetre C
; Wijetunga NA
; Ó Broin P
; Sato H
; Zhang Z
; Jeddeloh J
; Montagna C
; Golden A
; Seoighe C
; Greally JM
Epigenetics Chromatin
2015[]; 8
(ä): 46
PMID26579211
show ga
BACKGROUND: RNA:DNA hybrids represent a non-canonical nucleic acid structure that
has been associated with a range of human diseases and potential transcriptional
regulatory functions. Mapping of RNA:DNA hybrids in human cells reveals them to
have a number of characteristics that give insights into their functions.
RESULTS: We find RNA:DNA hybrids to occupy millions of base pairs in the human
genome. A directional sequencing approach shows the RNA component of the RNA:DNA
hybrid to be purine-rich, indicating a thermodynamic contribution to their in
vivo stability. The RNA:DNA hybrids are enriched at loci with decreased DNA
methylation and increased DNase hypersensitivity, and within larger domains with
characteristics of heterochromatin formation, indicating potential
transcriptional regulatory properties. Mass spectrometry studies of chromatin at
RNA:DNA hybrids shows the presence of the ILF2 and ILF3 transcription factors,
supporting a model of certain transcription factors binding preferentially to the
RNA:DNA conformation. CONCLUSIONS: Overall, there is little to indicate a
dependence for RNA:DNA hybrids forming co-transcriptionally, with results from
the ribosomal DNA repeat unit instead supporting the intriguing model of RNA
generating these structures in trans. The results of the study indicate
heterogeneous functions of these genomic elements and new insights into their
formation and stability in vivo.