Journal of Microbiology

Reviews

Synthetic rescue in Saccharomyces cerevisiae: Concepts, large-scale genetic mapping, and functional implications: Ji Eun Choi, Woo-Hyun Chung; Received December 30, 2025 Accepted February 2, 2026 Published online March 12, 2026; DOI: https://doi.org/10.71150/jm.2512017 [Epub ahead of print]

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Abstract PDF: Synthetic rescue (SR) describes a genetic interaction in which the deleterious effect of a primary mutation is compensated by a second mutation, restoring cellular function or viability. In Saccharomyces cerevisiae, SR complements synthetic lethality (SL) by revealing compensatory mechanisms that maintain essential biological processes. Classical studies established SR as a fundamental principle of genetic robustness in yeast. Subsequent development of high-throughput genetic tools, including Synthetic Genetic Array (SGA), Epistatic Miniarray Profile (E-MAP), and CRISPR interference (CRISPRi), has enabled systematic identification of SR interactions across pathways of genome maintenance, proteostasis, and metabolism. Integration of these experimental datasets with computational and network-based analyses has transformed SR research from descriptive genetics into a predictive framework. Databases such as BioGRID, TheCellMap, and Mslar further support SR inference and link yeast genetic networks to human disease models. Understanding SR has important translational implications. The same compensatory logic that restores viability in yeast can explain therapeutic resistance in cancer cells. Together, these insights reveal SR as a powerful concept connecting microbial genetics with systems medicine, emphasizing that robustness and resilience are dynamic properties of living systems.

Signification and Application of Mutator and Antimutator Phenotype‑Induced Genetic Variations in Evolutionary Adaptation and Cancer Therapeutics: Woo-Hyun Chung; J. Microbiol. 2023;61(12):1013-1024. Published online December 15, 2023; DOI: https://doi.org/10.1007/s12275-023-00091-z

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Abstract PDF: Mutations present a dichotomy in their implications for cellular processes. They primarily arise from DNA replication errors or damage repair processes induced by environmental challenges. Cumulative mutations underlie genetic variations and drive evolution, yet also contribute to degenerative diseases such as cancer and aging. The mutator phenotype elucidates the heightened mutation rates observed in malignant tumors. Evolutionary adaptation, analogous to bacterial and eukaryotic systems, manifests through mutator phenotypes during changing environmental conditions, highlighting the delicate balance between advantageous mutations and their potentially detrimental consequences. Leveraging the genetic tractability of Saccharomyces cerevisiae offers unique insights into mutator phenotypes and genome instability akin to human cancers. Innovative reporter assays in yeast model organisms enable the detection of diverse genome alterations, aiding a comprehensive analysis of mutator phenotypes. Despite significant advancements, our understanding of the intricate mechanisms governing spontaneous mutation rates and preserving genetic integrity remains incomplete. This review outlines various cellular pathways affecting mutation rates and explores the role of mutator genes and mutation-derived phenotypes, particularly prevalent in malignant tumor cells. An in-depth comprehension of mutator and antimutator activities in yeast and higher eukaryotes holds promise for effective cancer control strategies.

Functional interplay between the oxidative stress response and DNA damage checkpoint signaling for genome maintenance in aerobic organisms: Ji Eun Choi , Woo-Hyun Chung; J. Microbiol. 2020;58(2):81-91. Published online December 23, 2019; DOI: https://doi.org/10.1007/s12275-020-9520-x

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The DNA damage checkpoint signaling pathway is a highly conserved surveillance mechanism that ensures genome integrity by sequential activation of protein kinase cascades. In mammals, the main pathway is orchestrated by two central sensor kinases, ATM and ATR, that are activated in response to DNA damage and DNA replication stress. Patients lacking functional ATM or ATR suffer from ataxia-telangiectasia (A-T) or Seckel syndrome, respectively, with pleiotropic degenerative phenotypes. In addition to DNA strand breaks, ATM and ATR also respond to oxidative DNA damage and reactive oxygen species (ROS), suggesting an unconventional function as regulators of intracellular redox status. Here, we summarize the multiple roles of ATM and ATR, and of their orthologs in Saccharomyces cerevisiae, Tel1 and Mec1, in DNA damage checkpoint signaling and the oxidative stress response, and discuss emerging ideas regarding the possible mechanisms underlying the elaborate crosstalk between those pathways. This review may provide new insights into the integrated cellular strategies responsible for maintaining genome stability in eukaryotes with a focus on the yeast model organism.

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MINIREVIEW] Synthetic lethal interaction between oxidative stress response and DNA damage repair in the budding yeast and its application to targeted anticancer therapy: Ji Eun Choi , Woo-Hyun Chung; J. Microbiol. 2019;57(1):9-17. Published online December 29, 2018; DOI: https://doi.org/10.1007/s12275-019-8475-2

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Synthetic lethality is an extreme form of negative genetic epistasis that arises when a combination of functional deficiency in two or more genes results in cell death, whereas none of the single genetic perturbations are lethal by themselves. This unconventional genetic interaction is a modification of the concept of essentiality that can be exploited for the purpose of targeted cancer therapy. The yeast Saccharomyces cerevisiae has been pivotally used for early large-scale synthetic lethal screens due to its experimental advantages, but recent advances in gene silencing technology have now made direct high-throughput analysis possible in higher organisms. Identification of tumor-specific alterations and characterization of the mechanistic principles underlying synthetic lethal interaction are the key to applying synthetic lethality to clinical cancer treatment by enabling genome-driven oncological research. Here, we provide emerging ideas on the synthetic lethal interactions in budding yeast, particularly between cellular processes responsible for oxidative stress response and DNA damage repair, and discuss how they can be appropriately utilized for context-dependent cancer therapeutics.

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[Minireview] Unraveling new functions of superoxide dismutase using yeast model system: Beyond its conventional role in superoxide radical scavenging: Woo-Hyun Chung ,; J. Microbiol. 2017;55(6):409-416. Published online March 9, 2017; DOI: https://doi.org/10.1007/s12275-017-6647-5

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Abstract PDF

To deal with chemically reactive oxygen molecules constantly threatening aerobic life, cells are readily equipped with elabo-rate biological antioxidant systems. Superoxide dismutase is a metalloenzyme catalytically eliminating superoxide radi-cal as a first-line defense mechanism against oxidative stress. Multiple different SOD isoforms have been developed through-out evolution to play distinct roles in separate subcellular com-partments. SOD is not essential for viability of most aerobic organisms and intriguingly found even in strictly anaerobic bacteria. Sod1 has recently been known to play important roles as a nuclear transcription factor, an RNA binding pro-tein, a synthetic lethal interactor, and a signal modulator in glucose metabolism, most of which are independent of its canonical function as an antioxidant enzyme. In this review, recent advances in understanding the unconventional role of Sod1 are highlighted and discussed with an emphasis on its genetic crosstalk with DNA damage repair/checkpoint path-ways. The budding yeast Saccharomyces cerevisiae has been successfully used as an efficient tool and a model organism to investigate a number of novel functions of Sod1.

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MINIREVIEW] To Peep into Pif1 Helicase: Multifaceted All the Way from Genome Stability to Repair-Associated DNA Synthesis: Woo-Hyun Chung; J. Microbiol. 2014;52(2):89-98. Published online February 1, 2014; DOI: https://doi.org/10.1007/s12275-014-3524-3

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Abstract PDF

Pif1 DNA helicase is the prototypical member of a 5' to 3' helicase superfamily conserved from bacteria to humans. In Saccharomyces cerevisiae, Pif1 and its homologue Rrm3, localize in both mitochondria and nucleus playing multiple roles in the maintenance of genomic homeostasis. They display relatively weak processivities in vitro, but have largely non-overlapping functions on common genomic loci such as mitochondrial DNA, telomeric ends, and many replication forks especially at hard-to-replicate regions including ribosomal DNA and G-quadruplex structures. Recently, emerging evidence shows that Pif1, but not Rrm3, has a significant new role in repair-associated DNA synthesis with Polδ during homologous recombination stimulating D-loop migration for conservative DNA replication. Comparative genetic and biochemical studies on the structure and function of Pif1 family helicases across different biological systems are further needed to elucidate both diversity and specificity of their mechanisms of action that contribute to genome stability.

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The Drosophila melanogaster PIF1 Helicase Promotes Survival During Replication Stress and Processive DNA Synthesis During Double-Strand Gap Repair
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The signature motif of the Saccharomyces cerevisiae Pif1 DNA helicase is essential in vivo for mitochondrial and nuclear functions and in vitro for ATPase activity
Carly L Geronimo, Saurabh P Singh, Roberto Galletto, Virginia A Zakian
Nucleic Acids Research.2018; 46(16): 8357. CrossRef
DNA-unwinding activity of Saccharomyces cerevisiae Pif1 is modulated by thermal stability, folding conformation, and loop lengths of G-quadruplex DNA
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Role of the Pif1-PCNA Complex in Pol δ-Dependent Strand Displacement DNA Synthesis and Break-Induced Replication
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