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- Hrq1 Facilitates Nucleotide Excision Repair of DNA Damage Induced by 4-Nitroquinoline-1-Oxide and Cisplatin in Saccharomyces cerevisiae
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Do-Hee Choi , Moon-Hee Min , Min-Ji Kim , Rina Lee , Sung-Hun Kwon , Sung-Ho Bae
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J. Microbiol. 2014;52(4):292-298. Published online March 29, 2014
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DOI: https://doi.org/10.1007/s12275-014-4018-z
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Abstract
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Hrq1 helicase is a novel member of the RecQ family. Among the five human RecQ helicases, Hrq1 is most homologous to RECQL4 and is conserved in fungal genomes. Recent genetic and biochemical studies have shown that it is a functional
gene, involved in the maintenance of genome stability. To better define the roles of Hrq1 in yeast cells, we investigated genetic interactions between HRQ1 and several DNA repair genes. Based on DNA damage sensitivities induced by 4-nitroquinoline-
1-oxide (4-NQO) or cisplatin, RAD4 was found to be epistatic to HRQ1. On the other hand, mutant strains defective in either homologous recombination (HR) or postreplication repair (PRR) became more sensitive by additional deletion of HRQ1, indicating that HRQ1 functions in the RAD4-dependent nucleotide excision repair (NER) pathway independent of HR or PRR. In support of this, yeast twohybrid
analysis showed that Hrq1 interacted with Rad4, which was enhanced by DNA damage. Overexpression of Hrq1K318A helicase-deficient protein rendered mutant cells more sensitive to 4-NQO and cisplatin, suggesting that helicase activity is required for the proper function of Hrq1 in NER.
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Citations
Citations to this article as recorded by

- Metabolomics Combined with Physiology and Transcriptomics Reveal the Response of Samsoniella hepiali to Key Metabolic Pathways and Its Degradation Mechanism during Subculture
Hui He, Zhengfei Cao, Tao Wang, Chuyu Tang, Yuling Li, Xiuzhang Li
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DNA Repair.2015; 33: 17. CrossRef - Characterization of Hrq1-Rad14 Interaction in Saccharomyces cerevisiae
Moon-Hee Min, Min-Ji Kim, You-Jin Choi, Min-Ju You, Uy-Ra Kim, Hyo-Bin An, Chae-Hyun Kim, Chae-Yeon Kwon, Sung-Ho Bae
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- Hrq1 Functions Independently of Sgs1 to Preserve Genome Integrity in Saccharomyces cerevisiae
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Do-Hee Choi , Rina Lee , Sung-Hun Kwon , Sung-Ho Bae
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J. Microbiol. 2013;51(1):105-112. Published online March 2, 2013
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DOI: https://doi.org/10.1007/s12275-013-3048-2
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38
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0
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18
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Abstract
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Maintenance of genome stability in eukaryotes involves a number of conserved proteins, including RecQ helicases, which play multiple roles at various steps in homologous recombination and DNA repair pathways. Sgs1 has been described as the only RecQ helicase in lower eukaryotes. However, recent studies revealed the presence of a second RecQ helicase, Hrq1, which is most homologous to human RECQL4. Here we show that hrq1Δ mutation resulted in increased mitotic recombination and spontaneous mutation in Saccharomyces cerevisiae, and sgs1Δ mutation had additive effects on the phenotypes of hrq1Δ. We also observed that the hrq1Δ mutant was sensitive to 4-nitroquinoline 1-oxide and cisplatin, which was not complemented by overexpression of Sgs1. In addition, the hrq1Δ sgs1Δ double mutant displayed synthetic growth defect as well as a shortened chronological life span compared with the respective single mutants. Analysis of the type of age-dependent Canr mutations revealed that only point mutations were found in hrq1Δ, whereas significant numbers of gross deletion mutations were found in sgs1Δ. Our results suggest that Hrq1 is involved in recombination and DNA repair pathways in S. cerevisiae independent of Sgs1.
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Citations
Citations to this article as recorded by

- Deletion of IRC19 Causes Defects in DNA Double-Strand Break Repair Pathways in Saccharomyces cerevisiae
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Journal of Microbiology.2021; 59(4): 401. CrossRef - Analyses of DNA double-strand break repair pathways in tandem arrays of HXT genes of Saccharomyces cerevisiae
Ju-Hee Choi, Ye-Seul Lim, Min-Ku Kim, Sung-Ho Bae
Journal of Microbiology.2020; 58(11): 957. CrossRef - The Genetic and Physical Interactomes of theSaccharomyces cerevisiaeHrq1 Helicase
Cody M Rogers, Elsbeth Sanders, Phoebe A Nguyen, Whitney Smith-Kinnaman, Amber L Mosley, Matthew L Bochman
G3 Genes|Genomes|Genetics.2020; 10(12): 4347. CrossRef - Maintenance of Yeast Genome Integrity by RecQ Family DNA Helicases
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BMB Reports.2019; 52(10): 607. CrossRef - The RecQ‐like helicase HRQ1 is involved in DNA crosslink repair in Arabidopsis in a common pathway with the Fanconi anemia‐associated nuclease FAN1 and the postreplicative repair ATPase RAD5A
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