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Control of DNA end resection by yeast Hmo1p affects efficiency of DNA end-joining.
DNA Repair (Amst). 2017 05; 53:15-23.DR

Abstract

The primary pathways for DNA double strand break (DSB) repair are homologous recombination (HR) and non-homologous end-joining (NHEJ). The choice between HR and NHEJ is influenced by the extent of DNA end resection, as extensive resection is required for HR but repressive to NHEJ. Conversely, association of the DNA end-binding protein Ku, which is integral to classical NHEJ, inhibits resection. In absence of key NHEJ components, a third repair pathway is exposed; this alternative-end joining (A-EJ) is a highly error-prone process that uses micro-homologies at the breakpoints and is initiated by DNA end resection. In Saccharomyces cerevisiae, the high mobility group protein Hmo1p has been implicated in controlling DNA end resection, suggesting its potential role in repair pathway choice. Using a plasmid end-joining assay, we show here that absence of Hmo1p results in reduced repair efficiency and accuracy, indicating that Hmo1p promotes end-joining; this effect is only observed on DNA with protruding ends. Notably, inhibition of DNA end resection in an hmo1Δ strain restores repair efficiency to the levels observed in wild-type cells. In absence of Ku, HMO1 deletion also reduces repair efficiency further, while inhibition of resection restores repair efficiency to the levels observed in kuΔ. We suggest that Hmo1p functions to control DNA end resection, thereby preventing error-prone A-EJ repair and directing repairs towards classical NHEJ. The very low efficiency of DSB repair in kuΔhmo1Δ cells further suggests that excessive DNA resection is inhibitory for A-EJ.

Authors+Show Affiliations

Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA.Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA.Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA.Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA. Electronic address: agrove@lsu.edu.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28336179

Citation

Panday, Arvind, et al. "Control of DNA End Resection By Yeast Hmo1p Affects Efficiency of DNA End-joining." DNA Repair, vol. 53, 2017, pp. 15-23.
Panday A, Xiao L, Gupta A, et al. Control of DNA end resection by yeast Hmo1p affects efficiency of DNA end-joining. DNA Repair (Amst). 2017;53:15-23.
Panday, A., Xiao, L., Gupta, A., & Grove, A. (2017). Control of DNA end resection by yeast Hmo1p affects efficiency of DNA end-joining. DNA Repair, 53, 15-23. https://doi.org/10.1016/j.dnarep.2017.03.002
Panday A, et al. Control of DNA End Resection By Yeast Hmo1p Affects Efficiency of DNA End-joining. DNA Repair (Amst). 2017;53:15-23. PubMed PMID: 28336179.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Control of DNA end resection by yeast Hmo1p affects efficiency of DNA end-joining. AU - Panday,Arvind, AU - Xiao,LiJuan, AU - Gupta,Ashish, AU - Grove,Anne, Y1 - 2017/03/09/ PY - 2016/11/09/received PY - 2017/01/03/revised PY - 2017/03/07/accepted PY - 2017/3/25/pubmed PY - 2017/7/29/medline PY - 2017/3/25/entrez KW - Alternate end-joining KW - DNA end resection KW - High mobility group protein KW - NHEJ KW - Plasmid end-joining SP - 15 EP - 23 JF - DNA repair JO - DNA Repair (Amst) VL - 53 N2 - The primary pathways for DNA double strand break (DSB) repair are homologous recombination (HR) and non-homologous end-joining (NHEJ). The choice between HR and NHEJ is influenced by the extent of DNA end resection, as extensive resection is required for HR but repressive to NHEJ. Conversely, association of the DNA end-binding protein Ku, which is integral to classical NHEJ, inhibits resection. In absence of key NHEJ components, a third repair pathway is exposed; this alternative-end joining (A-EJ) is a highly error-prone process that uses micro-homologies at the breakpoints and is initiated by DNA end resection. In Saccharomyces cerevisiae, the high mobility group protein Hmo1p has been implicated in controlling DNA end resection, suggesting its potential role in repair pathway choice. Using a plasmid end-joining assay, we show here that absence of Hmo1p results in reduced repair efficiency and accuracy, indicating that Hmo1p promotes end-joining; this effect is only observed on DNA with protruding ends. Notably, inhibition of DNA end resection in an hmo1Δ strain restores repair efficiency to the levels observed in wild-type cells. In absence of Ku, HMO1 deletion also reduces repair efficiency further, while inhibition of resection restores repair efficiency to the levels observed in kuΔ. We suggest that Hmo1p functions to control DNA end resection, thereby preventing error-prone A-EJ repair and directing repairs towards classical NHEJ. The very low efficiency of DSB repair in kuΔhmo1Δ cells further suggests that excessive DNA resection is inhibitory for A-EJ. SN - 1568-7856 UR - https://www.unboundmedicine.com/medline/citation/28336179/Control_of_DNA_end_resection_by_yeast_Hmo1p_affects_efficiency_of_DNA_end_joining_ DB - PRIME DP - Unbound Medicine ER -