Holliday Junctions Are Associated with Transposable Element Sequences in the Human Genome

Journal of Molecular Biology
Paris LadiasIoannis Georgiou

Abstract

Holliday junctions (HJs) constitute important intermediate structures for many cell functions such as DNA recombination and DNA repair. They derive from a 10-nt degenerate sequence, with a 3-nt core motif. In this study, we explored the human genome whether the HJ degenerate sequence associates with transposable elements (TEs) and mainly with those of the active and inactive ALU, LINE, SVA and HERV families. We identified six different forms of the HJ sequence motif, and we located the genomic coordinates of sequences containing both HJs and TEs. From 2982 total HJs, a significant number of 1319 TE-associated HJs were found, with a median distribution of 1 per 2.4 Mb. The HJs with higher GC content were observed more frequently at the genome. A high percentage of HJs were associated with all main TE families, with specificity for particular active or inactive elements: DNA elements and the retroelements ALUs, LINEs and HERVs up to 41.94%, 72.72%, 42.94% and 84.5%, respectively. Phylogenetic analysis revealed that HJs occur in both active and inactive TEs. Furthermore, the TE-associated HJs were almost exclusively found within a distance less than 1 Mb from human genes, while only 23 were not associated with any genes. This is t...Continue Reading

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May 16, 2013·PLoS Genetics·Pierre-Étienne JacquesGuillaume Bourque

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