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Sung-Ho Bae 6 Articles
Effects of the loss of mismatch repair genes on single-strand annealing between divergent sequences in Saccharomyces cerevisiae
Ye-Seul Lim , Ju-Hee Choi , Kyu-Jin Ahn , Min-Ku Kim , Sung-Ho Bae
J. Microbiol. 2021;59(4):401-409.   Published online March 29, 2021
DOI: https://doi.org/10.1007/s12275-021-1076-x
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AbstractAbstract PDF
Eukaryotic genomes contain many duplicated genes closely located with each other, such as the hexose transporter (HXT) genes in Saccharomyces cerevisiae. They can potentially recombine via single-strand annealing (SSA) pathway. SSA between highly divergent sequences generates heteroduplex DNA intermediates with many mismatches, which can be corrected by mismatch repair (MMR), resulting in recombinant sequences with a single junction point. In this report, we demonstrate that SSA between HXT1 and HXT4 genes in MMR-deficient yeast cells produces recombinant genes with multiple-junctions resulting from alternating HXT1 and HXT4 tracts. The mutations in MMR genes had differential effects on SSA frequencies; msh6Δ mutation significantly stimulated SSA events, whereas msh2Δ and msh3Δ slightly suppressed it. We set up an assay that can identify a pair of recombinant genes derived from a single heteroduplex DNA. As a result, the recombinant genes with multiple-junctions were found to accompany genes with single-junctions. Based on the results presented here, a model was proposed to generate multiple-junctions in SSA pathway involving an alternative short-patch repair system.
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
J. Microbiol. 2020;58(11):957-966.   Published online October 30, 2020
DOI: https://doi.org/10.1007/s12275-020-0461-1
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  • 4 Crossref
AbstractAbstract PDF
Eukaryotic genomes contain numerous homologous repeat sequences including redundant genes with divergent homology that can be potential recombination targets. Recombination between divergent sequences is rare but poses a substantial threat to genome stability. The hexose transporter (HXT) gene family shares high sequence similarities at both protein and DNA levels, and some members are placed close together in tandem arrays. In this study, we show that spontaneous interstitial deletions occur at significantly high rates in HXT gene clusters, resulting in chimeric HXT sequences that contain a single junction point. We also observed that DNA double-strand breaks created between HXT genes produce primarily interstitial deletions, whereas internal cleavage of the HXT gene resulted in gene conversions as well as deletion products. Interestingly, interstitial deletions were less constrained by sequence divergence than gene conversion. Moreover, recombination-defective mutations differentially affected the survival frequency. Mutations that impair single-strand annealing (SSA) pathway greatly reduced the survival frequency by 10–1,000-fold, whereas disruption of Rad51-dependent homologous recombination exhibited only modest reduction. Our results indicate that recombination in the tandemly repeated HXT genes occurs primarily via SSA pathway.

Citations

Citations to this article as recorded by  
  • Deletion of IRC19 Causes Defects in DNA Double-Strand Break Repair Pathways in Saccharomyces cerevisiae
    Ju-Hee Choi, Oyungoo Bayarmagnai, Sung-Ho Bae
    Journal of Microbiology.2024; 62(9): 749.     CrossRef
  • A novel CRISPR/Cas9 system with high genomic editing efficiency and recyclable auxotrophic selective marker for multiple-step metabolic rewriting in Pichia pastoris
    Xiang Wang, Yi Li, Zhehao Jin, Xiangjian Liu, Xiang Gao, Shuyuan Guo, Tao Yu
    Synthetic and Systems Biotechnology.2023; 8(3): 445.     CrossRef
  • Enhancing Homologous Recombination Efficiency in Pichia pastoris for Multiplex Genome Integration Using Short Homology Arms
    Jucan Gao, Cuifang Ye, Jintao Cheng, Lihong Jiang, Xinghao Yuan, Jiazhang Lian
    ACS Synthetic Biology.2022; 11(2): 547.     CrossRef
  • Effects of the loss of mismatch repair genes on single-strand annealing between divergent sequences in Saccharomyces cerevisiae
    Ye-Seul Lim, Ju-Hee Choi, Kyu-Jin Ahn, Min-Ku Kim, Sung-Ho Bae
    Journal of Microbiology.2021; 59(4): 401.     CrossRef
Hrq1 Facilitates Nucleotide Excision Repair of DNA Damage Induced by 4-Nitroquinoline-1-Oxide and Cisplatin in Saccharomyces cerevisiae
Do-Hee Choi , Moon-Hee Min , Min-Ji Kim , Rina Lee , Sung-Hun Kwon , Sung-Ho Bae
J. Microbiol. 2014;52(4):292-298.   Published online March 29, 2014
DOI: https://doi.org/10.1007/s12275-014-4018-z
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  • 15 Crossref
AbstractAbstract PDF
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 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
    Antioxidants.2024; 13(7): 780.     CrossRef
  • Yeast Ribonucleotide Reductase Is a Direct Target of the Proteasome and Provides Hyper Resistance to the Carcinogen 4-NQO
    Daria S. Spasskaya, Kirill A. Kulagin, Evgenia N. Grineva, Pamila J. Osipova, Svetlana V. Poddubko, Julia A. Bubis, Elizaveta M. Kazakova, Tomiris T. Kusainova, Vladimir A. Gorshkov, Frank Kjeldsen, Vadim L. Karpov, Irina A. Tarasova, Dmitry S. Karpov
    Journal of Fungi.2023; 9(3): 351.     CrossRef
  • Hrq1/RECQL4 regulation is critical for preventing aberrant recombination during DNA intrastrand crosslink repair and is upregulated in breast cancer
    Thong T. Luong, Zheqi Li, Nolan Priedigkeit, Phoebe S. Parker, Stefanie Böhm, Kyle Rapchak, Adrian V. Lee, Kara A. Bernstein, Dmitry A. Gordenin
    PLOS Genetics.2022; 18(9): e1010122.     CrossRef
  • A skipping rope translocation mechanism in a widespread family of DNA repair helicases
    Johann J Roske, Sunbin Liu, Bernhard Loll, Ursula Neu, Markus C Wahl
    Nucleic Acids Research.2021; 49(1): 504.     CrossRef
  • Role and Regulation of the RECQL4 Family during Genomic Integrity Maintenance
    Thong T. Luong, Kara A. Bernstein
    Genes.2021; 12(12): 1919.     CrossRef
  • Zuo1 supports G4 structure formation and directs repair toward nucleotide excision repair
    Alessio De Magis, Silvia Götz, Mona Hajikazemi, Enikő Fekete-Szücs, Marco Caterino, Stefan Juranek, Katrin Paeschke
    Nature Communications.2020;[Epub]     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
    Sonia Vidushi Gupta, Kristina Hildegard Schmidt
    Genes.2020; 11(2): 205.     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
  • DNA Helicases as Safekeepers of Genome Stability in Plants
    Annika Dorn, Holger Puchta
    Genes.2019; 10(12): 1028.     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
    Sarah Röhrig, Annika Dorn, Janina Enderle, Angelina Schindele, Natalie J. Herrmann, Alexander Knoll, Holger Puchta
    New Phytologist.2018; 218(4): 1478.     CrossRef
  • Yeast Hrq1 shares structural and functional homology with the disease-linked human RecQ4 helicase
    Cody M. Rogers, Joseph Che-Yen Wang, Hiroki Noguchi, Tsuyoshi Imasaki, Yuichiro Takagi, Matthew L. Bochman
    Nucleic Acids Research.2017; 45(9): 5217.     CrossRef
  • Interaction of RECQ4 and MCM10 is important for efficient DNA replication origin firing in human cells
    Maciej Kliszczak, Hana Sedlackova, Ganesha P. Pitchai, Werner W. Streicher, Lumir Krejci, Ian D. Hickson
    Oncotarget.2015; 6(38): 40464.     CrossRef
  • DNA repair defects ascribed to pby1 are caused by disruption of Holliday junction resolvase Mus81-Mms4
    Gizem Ölmezer, Dominique Klein, Ulrich Rass
    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
    The Korean Journal of Microbiology.2014; 50(2): 95.     CrossRef
Hrq1 Functions Independently of Sgs1 to Preserve Genome Integrity in Saccharomyces cerevisiae
Do-Hee Choi , Rina Lee , Sung-Hun Kwon , Sung-Ho Bae
J. Microbiol. 2013;51(1):105-112.   Published online March 2, 2013
DOI: https://doi.org/10.1007/s12275-013-3048-2
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  • 18 Crossref
AbstractAbstract PDF
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.

Citations

Citations to this article as recorded by  
  • Deletion of IRC19 Causes Defects in DNA Double-Strand Break Repair Pathways in Saccharomyces cerevisiae
    Ju-Hee Choi, Oyungoo Bayarmagnai, Sung-Ho Bae
    Journal of Microbiology.2024; 62(9): 749.     CrossRef
  • Systematic analysis of changes across different developmental stages of the mushroom Sarcomyxa edulis
    Chao Duan, Lan Yao, Jian-Hua Lv, Chuan-Wen Jia, Feng-hua Tian, Chang-Tian Li
    Gene.2022; 824: 146450.     CrossRef
  • Human RecQ Helicases in DNA Double-Strand Break Repair
    Huiming Lu, Anthony J. Davis
    Frontiers in Cell and Developmental Biology.2021;[Epub]     CrossRef
  • Effects of the loss of mismatch repair genes on single-strand annealing between divergent sequences in Saccharomyces cerevisiae
    Ye-Seul Lim, Ju-Hee Choi, Kyu-Jin Ahn, Min-Ku Kim, Sung-Ho Bae
    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
    Sonia Vidushi Gupta, Kristina Hildegard Schmidt
    Genes.2020; 11(2): 205.     CrossRef
  • The nature of meiotic chromosome dynamics and recombination in budding yeast
    Soogil Hong, Jeong Hwan Joo, Hyeseon Yun, Keunpil Kim
    Journal of Microbiology.2019; 57(4): 221.     CrossRef
  • Ku complex suppresses recombination in the absence of MRX activity during budding yeast meiosis
    Hyeseon Yun, Keunpil Kim
    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
    Sarah Röhrig, Annika Dorn, Janina Enderle, Angelina Schindele, Natalie J. Herrmann, Alexander Knoll, Holger Puchta
    New Phytologist.2018; 218(4): 1478.     CrossRef
  • Disruption of SUMO-targeted ubiquitin ligases Slx5–Slx8/RNF4 alters RecQ-like helicase Sgs1/BLM localization in yeast and human cells
    Stefanie Böhm, Michael Joseph Mihalevic, Morgan Alexandra Casal, Kara Anne Bernstein
    DNA Repair.2015; 26: 1.     CrossRef
  • Interaction of RECQ4 and MCM10 is important for efficient DNA replication origin firing in human cells
    Maciej Kliszczak, Hana Sedlackova, Ganesha P. Pitchai, Werner W. Streicher, Lumir Krejci, Ian D. Hickson
    Oncotarget.2015; 6(38): 40464.     CrossRef
  • Hrq1 facilitates nucleotide excision repair of DNA damage induced by 4-nitroquinoline-1-oxide and cisplatin in Saccharomyces cerevisiae
    Do-Hee Choi, Moon-Hee Min, Min-Ji Kim, Rina Lee, Sung-Hun Kwon, Sung-Ho Bae
    Journal of Microbiology.2014; 52(4): 292.     CrossRef
  • Conditional Genetic Interactions ofRTT107,SLX4, andHRQ1Reveal Dynamic Networks upon DNA Damage inS. cerevisiae
    Grace P Leung, Maria J Aristizabal, Nevan J Krogan, Michael S Kobor
    G3 Genes|Genomes|Genetics.2014; 4(6): 1059.     CrossRef
  • Characterization of the Caenorhabditis elegans HIM-6/BLM Helicase: Unwinding Recombination Intermediates
    Hana Jung, Jin A Lee, Seoyoon Choi, Hyunwoo Lee, Byungchan Ahn, Michael Lichten
    PLoS ONE.2014; 9(7): e102402.     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
    The Korean Journal of Microbiology.2014; 50(2): 95.     CrossRef
  • The intrinsically disordered amino-terminal region of human RecQL4: multiple DNA-binding domains confer annealing, strand exchange and G4 DNA binding
    Heidi Keller, Kristin Kiosze, Juliane Sachsenweger, Sebastian Haumann, Oliver Ohlenschläger, Tarmo Nuutinen, Juhani E. Syväoja, Matthias Görlach, Frank Grosse, Helmut Pospiech
    Nucleic Acids Research.2014; 42(20): 12614.     CrossRef
  • Human RecQ Helicases in DNA Repair, Recombination, and Replication
    Deborah L. Croteau, Venkateswarlu Popuri, Patricia L. Opresko, Vilhelm A. Bohr
    Annual Review of Biochemistry.2014; 83(1): 519.     CrossRef
Saccharomyces cerevisiae Cmr1 Protein Preferentially Binds to UV-Damaged DNA In Vitro
Do-Hee Choi , Sung-Hun Kwon , Joon-Ho Kim , Sung-Ho Bae
J. Microbiol. 2012;50(1):112-118.   Published online February 27, 2012
DOI: https://doi.org/10.1007/s12275-012-1597-4
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AbstractAbstract PDF
DNA metabolic processes such as DNA replication, recombination, and repair are fundamentally important for the maintenance of genome integrity and cell viability. Although a large number of proteins involved in these pathways have been extensively studied, many proteins still remain to be identified. In this study, we isolated DNA-binding proteins from Saccharomyces cerevisiae using DNA-cellulose columns. By analyzing the proteins using mass spectrometry, an uncharacterized protein, Cmr1/YDL156W, was identified. Cmr1 showed sequence homology to human Damaged-DNA binding protein 2 in its C-terminal WD40 repeats. Consistent with this finding, the purified recombinant Cmr1 protein was found to be intrinsically associated with DNA-binding activity and exhibited higher affinity to UV-damaged DNA substrates. Chromatin isolation experiments revealed that Cmr1 localized in both the chromatin and supernatant fractions, and the level of Cmr1 in the chromatin fraction increased when yeast cells were irradiated with UV. These
results
suggest that Cmr1 may be involved in DNA-damage responses in yeast.

Citations

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    Xingyu Liu, Ying Zhang, Zhihui Wen, Yan Hao, Charles A.S. Banks, Joseph Cesare, Saikat Bhattacharya, Shreyas Arvindekar, Jeffrey J. Lange, Yixuan Xie, Benjamin A. Garcia, Brian D. Slaughter, Jay R. Unruh, Shruthi Viswanath, Laurence Florens, Jerry L. Work
    Proceedings of the National Academy of Sciences.2024;[Epub]     CrossRef
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    Kundan Kumar, Romila Moirangthem, Rupinder Kaur, Michael Freitag
    PLOS Genetics.2020; 16(3): e1008620.     CrossRef
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    Buddhi Prakash Jain
    The Protein Journal.2019; 38(1): 58.     CrossRef
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  • Mte1 interacts with Mph1 and promotes crossover recombination and telomere maintenance
    Sonia Silva, Veronika Altmannova, Sarah Luke-Glaser, Peter Henriksen, Irene Gallina, Xuejiao Yang, Chunaram Choudhary, Brian Luke, Lumir Krejci, Michael Lisby
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  • Recruitment of Saccharomyces cerevisiae Cmr1/Ydl156w to Coding Regions Promotes Transcription Genome Wide
    Jeffery W. Jones, Priyanka Singh, Chhabi K. Govind, Sukesh R. Bhaumik
    PLOS ONE.2016; 11(2): e0148897.     CrossRef
  • Cmr1/WDR76 defines a nuclear genotoxic stress body linking genome integrity and protein quality control
    Irene Gallina, Camilla Colding, Peter Henriksen, Petra Beli, Kyosuke Nakamura, Judith Offman, David P. Mathiasen, Sonia Silva, Eva Hoffmann, Anja Groth, Chunaram Choudhary, Michael Lisby
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    Stephanie BM Miller, Chi‐Ting Ho, Juliane Winkler, Maria Khokhrina, Annett Neuner, Mohamed YH Mohamed, D Lys Guilbride, Karsten Richter, Michael Lisby, Elmar Schiebel, Axel Mogk, Bernd Bukau
    The EMBO Journal.2015; 34(6): 778.     CrossRef
  • Yeast gene CMR1/YDL156W is consistently co-expressed with genes participating in DNA-metabolic processes in a variety of stringent clustering experiments
    Basel Abu-Jamous, Rui Fa, David J. Roberts, Asoke K. Nandi
    Journal of The Royal Society Interface.2013; 10(81): 20120990.     CrossRef
  • Dissecting DNA damage response pathways by analysing protein localization and abundance changes during DNA replication stress
    Johnny M. Tkach, Askar Yimit, Anna Y. Lee, Michael Riffle, Michael Costanzo, Daniel Jaschob, Jason A. Hendry, Jiongwen Ou, Jason Moffat, Charles Boone, Trisha N. Davis, Corey Nislow, Grant W. Brown
    Nature Cell Biology.2012; 14(9): 966.     CrossRef
The Mutation of a Novel Saccharomyces cerevisiae SRL4 Gene Rescues the Lethality of rad53 and lcd1 Mutations by Modulating dNTP Levels
Do-Hee Choi , Young-Mi Oh , Sung-Hun Kwon , Sung-Ho Bae
J. Microbiol. 2008;46(1):75-80.
DOI: https://doi.org/10.1007/s12275-008-0013-6
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AbstractAbstract PDF
The SRL4 (YPL033C) gene was initially identified by the screening of Saccharomyces cerevisiae genes that play a role in DNA metabolism and/or genome stability using the SOS system of Escherichia coli. In this study, we found that the srl4Δ; mutant cells were resistant to the chemicals that inhibit nucleotide metabolism and evidenced higher dNTP levels than were observed in the wild-type cells in the presence of hydroxyurea. The mutant cells also showed a significantly faster growth rate and higher dNTP levels at low temperature (16 oC) than were observed in the wild-type cells, whereas we detected no differences in the growth rate at 30oC. Furthermore, srl4Δ was shown to suppress the lethality of mutations of the essential S phase checkpoint genes, RAD53 and LCD1. These results indicate that SRL4 may be involved in the regulation of dNTP production by its function as a negative regulator of ribonucleotide reductase.

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  • Peroxisomal Compartmentalization of the Methylerythritol-4-phosphate Pathway Alleviates Cellular Stress and Enhances Geraniol Production in Saccharomyces cerevisiae
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  • Saccharomyces cerevisiae Cmr1 protein preferentially binds to UV-damaged DNA in vitro
    Do-Hee Choi, Sung-Hun Kwon, Joon-Ho Kim, Sung-Ho Bae
    The Journal of Microbiology.2012; 50(1): 112.     CrossRef
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Sung-Ho Bae 3 Articles
Erratum: Effects of the Loss of Mismatch Repair Genes on Single-Strand Annealing Between Divergent Sequences in Saccharomyces cerevisiae
Ye-Seul Lim, Ju-Hee Choi, Kyu-Jin Ahn, Min-Ku Kim, Sung-Ho Bae
J. Microbiol. 2024;62(10):929-929.   Published online August 26, 2024
DOI: https://doi.org/10.1007/s12275-024-00126-z
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Erratum: 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
J. Microbiol. 2024;62(10):931-931.   Published online August 26, 2024
DOI: https://doi.org/10.1007/s12275-024-00127-y
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Deletion of IRC19 Causes Defects in DNA Double-Strand Break Repair Pathways in Saccharomyces cerevisiae
Ju-Hee Choi, Oyungoo Bayarmagnai, Sung-Ho Bae
J. Microbiol. 2024;62(9):749-758.   Published online July 12, 2024
DOI: https://doi.org/10.1007/s12275-024-00152-x
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AbstractAbstract PDF
DNA double-strand break (DSB) repair is a fundamental cellular process crucial for maintaining genome stability, with homologous recombination and non-homologous end joining as the primary mechanisms, and various alternative pathways such as single-strand annealing (SSA) and microhomology-mediated end joining also playing significant roles under specific conditions. IRC genes were previously identified as part of a group of genes associated with increased levels of Rad52 foci in Saccharomyces cerevisiae. In this study, we investigated the effects of IRC gene mutations on DSB repair, focusing on uncharacterized IRC10, 19, 21, 22, 23, and 24. Gene conversion (GC) assay revealed that irc10Δ, 22Δ, 23Δ, and 24Δ mutants displayed modest increases in GC frequencies, while irc19Δ and irc21Δ mutants exhibited significant reductions. Further investigation revealed that deletion mutations in URA3 were not generated in irc19Δ mutant cells following HO-induced DSBs. Additionally, irc19Δ significantly reduced frequency of SSA, and a synergistic interaction between irc19Δ and rad52Δ was observed in DSB repair via SSA. Assays to determine the choice of DSB repair pathways indicated that Irc19 is necessary for generating both GC and deletion products. Overall, these results suggest a potential role of Irc19 in DSB repair pathways, particularly in end resection process.

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