Correlations Between Long Inverted Repeat (LIR) Features, Deletion Size and Distance from Breakpoint in Human Gross Gene Deletions

Overview

Journal Sci Rep

Specialty Science

Date 2015 Feb 7

PMID 25657065

Citations 5

Authors

Nevim Aygun

Affiliations

Soon will be listed here.

Abstract

Long inverted repeats (LIRs) have been shown to induce genomic deletions in yeast. In this study, LIRs were investigated within ±10 kb spanning each breakpoint from 109 human gross deletions, using Inverted Repeat Finder (IRF) software. LIR number was significantly higher at the breakpoint regions, than in control segments (P < 0.001). In addition, it was found that strong correlation between 5' and 3' LIR numbers, suggesting contribution to DNA sequence evolution (r = 0.85, P < 0.001). 138 LIR features at ±3 kb breakpoints in 89 (81%) of 109 gross deletions were evaluated. Significant correlations were found between distance from breakpoint and loop length (r = -0.18, P < 0.05) and stem length (r = -0.18, P < 0.05), suggesting DNA strands are potentially broken in locations closer to bigger LIRs. In addition, bigger loops cause larger deletions (r = 0.19, P < 0.05). Moreover, loop length (r = 0.29, P < 0.02) and identity between stem copies (r = 0.30, P < 0.05) of 3' LIRs were more important in larger deletions. Consequently, DNA breaks may form via LIR-induced cruciform structure during replication. DNA ends may be later repaired by non-homologous end-joining (NHEJ), with following deletion.

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