Journal of Microbiology

Journal Article

Vaccine Development for Severe Fever with Thrombocytopenia Syndrome Virus in Dogs: Seok-Chan Park, Da-Eun Jeong, Sun-Woo Han, Joon-Seok Chae, Joo-Yong Lee, Hyun-Sook Kim, Bumseok Kim, Jun-Gu Kang; J. Microbiol. 2024;62(4):327-335. Published online April 18, 2024; DOI: https://doi.org/10.1007/s12275-024-00119-y

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Abstract: Severe fever with thrombocytopenia syndrome (SFTS) is a life-threatening viral zoonosis. The causative agent of this disease is the Dabie bandavirus, which is usually known as the SFTS virus (SFTSV). Although the role of vertebrates in SFTSV transmission to humans remains uncertain, some reports have suggested that dogs could potentially transmit SFTSV to humans. Consequently, preventive measures against SFTSV in dogs are urgently needed. In the present study, dogs were immunized three times at two-week intervals with formaldehyde-inactivated SFTSV with two types of adjuvants. SFTSV (KCD46) was injected into all dogs two weeks after the final immunization. Control dogs showed viremia from 2 to 4 days post infection (dpi), and displayed white pulp atrophy in the spleen, along with a high level of terminal deoxynucleotidyl transferase-mediated dUTP nick-end labelling assay (TUNEL) positive area. However, the inactivated SFTSV vaccine groups exhibited rare pathological changes and significantly reduced TUNEL positive areas in the spleen. Furthermore, SFTSV viral loads were not detected at any of the tested dpi. Our results indicate that both adjuvants can be safely used in combination with an inactivated SFTSV formulation to induce strong neutralizing antibodies. Inactivated SFTSV vaccines effectively prevent pathogenicity and viremia in dogs infected with SFTSV. In conclusion, our study highlighted the potential of inactivated SFTSV vaccination for SFTSV control in dogs.

Review

Searching for a Reliable Viral Indicator of Faecal Pollution in Aquatic Environments: Felana Harilanto Andrianjakarivony , Yvan Bettarel , Christelle Desnues; J. Microbiol. 2023;61(6):589-602. Published online June 1, 2023; DOI: https://doi.org/10.1007/s12275-023-00052-6

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The disposal of sewage in significant quantities poses a health hazard to aquatic ecosystems. These effluents can contain a wide range of pathogens, making faecal contamination a leading source of waterborne diseases around the world. Yet monitoring bacteria or viruses in aquatic environments is time consuming and expensive. The standard indicators of faecal pollution all have limitations, including difficulty in determining the source due to lack of host specificity, poor connection with the presence of non-bacterial pathogens, or low environmental persistence. Innovative monitoring techniques are sorely needed to provide more accurate and targeted solutions. Viruses are a promising alternative to faecal indicator bacteria for monitoring, as they are more persistent in ambient water, more abundant in faeces, and are extremely host-specific. Given the range of viruses found in diverse contexts, it is not easy to find one “ideal” viral indicator of faecal pollution; however, several are of interest. In parallel, the ongoing development of molecular techniques coupled with metagenomics and bioinformatics should enable improved ways to detect faecal contamination using viruses. This review examines the evolution of faecal contamination monitoring with the following aims (i) to identify the characteristics of the main viral indicators of faecal contamination, including human enteric viruses, bacteriophages, CRESS and plant viruses, (ii) to assess how these have been used to monitor water pollution in recent years, (iii) to evaluate the reliability of recent detection methods of such viruses, and (iv) to tentatively determine which viruses may be most effective as markers of faecal pollution.

Citations

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Review of carbon dot–hydrogel composite material as a future water-environmental regulator
Minghao Jiang, Yong Wang, Jichuan Li, Xing Gao
International Journal of Biological Macromolecules.2024; 269: 131850. CrossRef

Journal Articles

The velvet repressed vidA gene plays a key role in governing development in Aspergillus nidulans: Min-Ju Kim , Won-Hee Jung , Ye-Eun Son , Jae-Hyuk Yu , Mi-Kyung Lee , Hee-Soo Park; J. Microbiol. 2019;57(10):893-899. Published online August 28, 2019; DOI: https://doi.org/10.1007/s12275-019-9214-4

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Abstract

Fungal development is regulated by a variety of transcription factors in Aspergillus nidulans. Previous studies demonstrated that the NF-κB type velvet transcription factors regulate certain target genes that govern fungal differentiation and cellular metabolism. In this study, we characterize one of the VosA/VelB-inhibited developmental genes called vidA, which is predicted to encode a 581-amino acid protein with a C2H2 zinc finger domain at the C-terminus. Levels of vidA mRNA are high during the early and middle phases of asexual development and decrease during the late phase of asexual development and asexual spore (conidium) formation. Deletion of either vosA or velB results in increased vidA mRNA accumulation in conidia, suggesting that vidA transcript accumulation in conidia is repressed by VosA and VelB. Phenotypic analysis demonstrated that deletion of vidA causes decreased colony growth, reduced production of asexual spores, and abnormal formation of sexual fruiting bodies. In addition, the vidA deletion mutant conidia contain more trehalose and β-glucan than wild type. Overall, these results suggest that VidA is a putative transcription factor that plays a key role in governing proper fungal growth, asexual and sexual development, and conidia formation in A. nidulans.

Citations

Citations to this article as recorded by

Regulators of the Asexual Life Cycle of Aspergillus nidulans
Ye-Eun Son, Jae-Hyuk Yu, Hee-Soo Park
Cells.2023; 12(11): 1544. CrossRef
The Forkhead Gene fkhB is Necessary for Proper Development in Aspergillus nidulans
Seo-Yeong Jang, Ye-Eun Son, Dong-Soon Oh, Kap-Hoon Han, Jae-Hyuk Yu, Hee-Soo Park
Journal of Microbiology and Biotechnology.2023; 33(11): 1420. CrossRef
The function of a conidia specific transcription factor CsgA in Aspergillus nidulans
He-Jin Cho, Hee-Soo Park
Scientific Reports.2022;[Epub] CrossRef
The Putative C2H2 Transcription Factor VadH Governs Development, Osmotic Stress Response, and Sterigmatocystin Production in Aspergillus nidulans
Xiaoyu Li, Yanxia Zhao, Heungyun Moon, Jieyin Lim, Hee-Soo Park, Zhiqiang Liu, Jae-Hyuk Yu
Cells.2022; 11(24): 3998. CrossRef
The Role of Chromatin and Transcriptional Control in the Formation of Sexual Fruiting Bodies in Fungi
Minou Nowrousian
Microbiology and Molecular Biology Reviews.2022;[Epub] CrossRef
Functions of PUF Family RNA-Binding Proteins in Aspergillus nidulans
Sung-Hun Son, Seo-Yeong Jang, Hee-Soo Park
Journal of Microbiology and Biotechnology.2021; 31(5): 676. CrossRef
The putative sensor histidine kinase VadJ coordinates development and sterigmatocystin production in Aspergillus nidulans
Yanxia Zhao, Mi-Kyung Lee, Jieyin Lim, Heungyun Moon, Hee-Soo Park, Weifa Zheng, Jae-Hyuk Yu
Journal of Microbiology.2021; 59(8): 746. CrossRef
Unveiling the Functions of the VosA-VelB Target GenevidDinAspergillus nidulans
Ye-Eun Son, Hee-Soo Park
Mycobiology.2021; 49(3): 258. CrossRef
Velvet activated McrA plays a key role in cellular and metabolic development in Aspergillus nidulans
Mi-Kyung Lee, Ye-Eun Son, Hee-Soo Park, Ahmad Alshannaq, Kap-Hoon Han, Jae-Hyuk Yu
Scientific Reports.2020;[Epub] CrossRef
The role of the VosA-repressed dnjA gene in development and metabolism in Aspergillus species
Ye-Eun Son, He-Jin Cho, Wanping Chen, Sung-Hun Son, Mi-Kyung Lee, Jae-Hyuk Yu, Hee-Soo Park
Current Genetics.2020; 66(3): 621. CrossRef
Homeobox proteins are essential for fungal differentiation and secondary metabolism in Aspergillus nidulans
Sung-Hun Son, Ye-Eun Son, He-Jin Cho, Wanping Chen, Mi-Kyung Lee, Lee-Han Kim, Dong-Min Han, Hee-Soo Park
Scientific Reports.2020;[Epub] CrossRef
The brlA Gene Deletion Reveals That Patulin Biosynthesis Is Not Related to Conidiation in Penicillium expansum
Chrystian Zetina-Serrano, Ophélie Rocher, Claire Naylies, Yannick Lippi, Isabelle P. Oswald, Sophie Lorber, Olivier Puel
International Journal of Molecular Sciences.2020; 21(18): 6660. CrossRef

Expression of sexual genes in Aspergillus fumigatus homogeneous culture produced by vegetative mass mating: Joo-Yeon Lim , Hee-Moon Park; J. Microbiol. 2019;57(8):688-693. Published online May 11, 2019; DOI: https://doi.org/10.1007/s12275-019-9094-7

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Abstract

There are presently no studies on the genes for sexual development of Aspergillus fumigatus in situ using mating culture, primarily because of challenging experimental conditions that require a significantly long period of induction and produce developmentally heterogenous culture, harboring very few sexual organs. In order to overcome these challenges, we developed an efficient and convenient procedure called ‘vegetative mass mating (VeM)’ for study at a molecular level. The VeM method enabled production of a developmentally homogenous A. fumigatus culture, harboring many sexual organs in a plate within a short period of two weeks. Feasibility of the use of VeM for functional study of genes during A. fumigatus sexual development was evaluated by analyzing the transcription pattern of genes involved in pheromone signal transduction and regulation of sexual development. Here, we present for the first time, an in situ expression pattern of sexual genes during the mating process, induced by the VeM
method
, which will enable and promote the sexual development study of A. fumigatus at the molecular level.

Citations

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The Gβ-like Protein AfCpcB Affects Sexual Development, Response to Oxidative Stress and Phagocytosis by Alveolar Macrophages in Aspergillus fumigatus
Joo-Yeon Lim, Yeon-Ju Kim, Hee-Moon Park
Journal of Fungi.2022; 8(1): 56. CrossRef
The LAMMER Kinase, LkhA, Affects Aspergillus fumigatus Pathogenicity by Modulating Reproduction and Biosynthesis of Cell Wall PAMPs
Joo-Yeon Lim, Yeon Ju Kim, Seul Ah Woo, Jae Wan Jeong, Yu-Ri Lee, Cheol-Hee Kim, Hee-Moon Park
Frontiers in Cellular and Infection Microbiology.2021;[Epub] CrossRef
Global Sexual Fertility in the Opportunistic Pathogen Aspergillus fumigatus and Identification of New Supermater Strains
Sameira S. Swilaiman, Céline M. O’Gorman, Wenyue Du, Janyce A. Sugui, Joanne Del Buono, Matthias Brock, Kyung J. Kwon-Chung, George Szakacs, Paul S. Dyer
Journal of Fungi.2020; 6(4): 258. CrossRef

Reviews

MINIREVIEW] Transcriptional control of sexual development in Cryptococcus neoformans: Matthew E. Mead , Christina M. Hull; J. Microbiol. 2016;54(5):339-346. Published online April 20, 2016; DOI: https://doi.org/10.1007/s12275-016-6080-1

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Abstract

Developmental processes are essential for the normal life cycles of many pathogenic fungi, and they can facilitate survival in challenging environments, including the human host. Sexual development of the human fungal pathogen Cryptococcus neoformans not only produces infectious particles (spores) but has also enabled the evolution of new disease-related traits such as drug resistance. Transcription factor networks are essential to the development and pathogenesis of C. neoformans, and a variety of sequence-specific DNA-binding proteins control both key developmental transitions and virulence by regulating the expression of their target genes. In this review we discuss the roles of known transcription factors that harbor important connections to both development and virulence. Recent studies of these transcription factors have identified a common theme in which metabolic, stress, and other responses that are required for sexual development appear to have been co-opted for survival in the human host, thus facilitating pathogenesis. Future work elucidating the connection between development and pathogenesis will provide vital insights into the evolution of complex traits in eukaryotes as well as mechanisms that may be used to combat fungal pathogens.

Citations

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Effect of a Mating Type Gene Editing in Lentinula edodes Using RNP/Nanoparticle Complex
Minseek Kim, Minji Oh, Ji-Hoon Im, Eun-Ji Lee, Hojin Ryu, Hyeon-Su Ro, Youn-Lee Oh
Journal of Fungi.2024; 10(12): 866. CrossRef
Current Perspectives on Uniparental Mitochondrial Inheritance in Cryptococcus neoformans
Amber R. Matha, Xiaorong Lin
Pathogens.2020; 9(9): 743. CrossRef
Investigation of Mating Pheromone–Pheromone Receptor Specificity in Lentinula edodes
Sinil Kim, Byeongsuk Ha, Minseek Kim, Hyeon-Su Ro
Genes.2020; 11(5): 506. CrossRef
The Evolution of Sexual Reproduction and the Mating-Type Locus: Links to Pathogenesis of Cryptococcus Human Pathogenic Fungi
Sheng Sun, Marco A. Coelho, Márcia David-Palma, Shelby J. Priest, Joseph Heitman
Annual Review of Genetics.2019; 53(1): 417. CrossRef
Pathways of Pathogenicity: Transcriptional Stages of Germination in the Fatal Fungal Pathogen Rhizopus delemar
Poppy C. S. Sephton-Clark, Jose F. Muñoz, Elizabeth R. Ballou, Christina A. Cuomo, Kerstin Voelz, Aaron P. Mitchell
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Activation of the Mating Pheromone Response Pathway ofLentinula edodesby Synthetic Pheromones
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REVIEW] Developmental regulators in Aspergillus fumigatus: Hee-Soo Park , Jae-Hyuk Yu; J. Microbiol. 2016;54(3):223-231. Published online February 27, 2016; DOI: https://doi.org/10.1007/s12275-016-5619-5

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Abstract

The filamentous fungus Aspergillus fumigatus is the most prevalent airborne fungal pathogen causing severe and usually fatal invasive aspergillosis in immunocompromised patients. This fungus produces a large number of small hydrophobic asexual spores called conidia as the primary means of reproduction, cell survival, propagation, and infectivity. The initiation, progression, and completion of asexual development (conidiation) is controlled by various regulators that govern expression of thousands of genes associated with formation of the asexual developmental structure conidiophore, and biogenesis of conidia. In this review, we summarize key regulators that directly or indirectly govern conidiation in this important pathogenic fungus. Better understanding these developmental regulators may provide insights into the improvement in controlling both beneficial and detrimental aspects of various Aspergillus species.

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The putative sensor histidine kinase VadJ coordinates development and sterigmatocystin production in Aspergillus nidulans
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Patrícia Alves de Castro, Clara Valero, Jéssica Chiaratto, Ana Cristina Colabardini, Lakhansing Pardeshi, Lilian Pereira Silva, Fausto Almeida, Marina Campos Rocha, Roberto Nascimento Silva, Iran Malavazi, Wenyue Du, Paul S. Dyer, Matthias Brock, Flávio V
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The Heterotrimeric Transcription Factor CCAAT-Binding Complex and Ca 2+ -CrzA Signaling Reversely Regulate the Transition between Fungal Hyphal Growth and Asexual Reproduction
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mBio.2021;[Epub] CrossRef
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Yuanwei Zhang, Jialu Fan, Jing Ye, Ling Lu
Molecular Microbiology.2021; 115(6): 1191. CrossRef
Deep convolutional neural network: a novel approach for the detection of Aspergillus fungi via stereomicroscopy
Haozhong Ma, Jinshan Yang, Xiaolu Chen, Xinyu Jiang, Yimin Su, Shanlei Qiao, Guowei Zhong
Journal of Microbiology.2021; 59(6): 563. CrossRef
The Arf-GAP AoGlo3 regulates conidiation, endocytosis, and pathogenicity in the nematode-trapping fungus Arthrobotrys oligospora
Yuxin Ma, Xuewei Yang, Meihua Xie, Guosheng Zhang, Le Yang, Na Bai, Yining Zhao, Dongni Li, Ke-Qin Zhang, Jinkui Yang
Fungal Genetics and Biology.2020; 138: 103352. CrossRef
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James I. P. Stewart, Vinicius M. Fava, Joshua D. Kerkaert, Adithya S. Subramanian, Fabrice N. Gravelat, Melanie Lehoux, P. Lynne Howell, Robert A. Cramer, Donald C. Sheppard, James W. Kronstad
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Velvet activated McrA plays a key role in cellular and metabolic development in Aspergillus nidulans
Mi-Kyung Lee, Ye-Eun Son, Hee-Soo Park, Ahmad Alshannaq, Kap-Hoon Han, Jae-Hyuk Yu
Scientific Reports.2020;[Epub] CrossRef
The Transcriptional Regulator HbxA Governs Development, Secondary Metabolism, and Virulence in Aspergillus fumigatus
Timothy Satterlee, Binita Nepal, Sophie Lorber, Olivier Puel, Ana M. Calvo, Irina S. Druzhinina
Applied and Environmental Microbiology.2020;[Epub] CrossRef
The Cell Wall Integrity Pathway Contributes to the Early Stages of Aspergillus fumigatus Asexual Development
Marina Campos Rocha, João Henrique Tadini Marilhano Fabri, Isabelle Taira Simões, Rafael Silva-Rocha, Daisuke Hagiwara, Anderson Ferreira da Cunha, Gustavo Henrique Goldman, David Cánovas, Iran Malavazi, Irina S. Druzhinina
Applied and Environmental Microbiology.2020;[Epub] CrossRef
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Zheng Zhang, Yuan Jiang, Jun Chen, Peiying Chen, Qingtao Kong, Ling Lu, Hong Sang
Medical Mycology.2020; 58(4): 543. CrossRef
The brlA Gene Deletion Reveals That Patulin Biosynthesis Is Not Related to Conidiation in Penicillium expansum
Chrystian Zetina-Serrano, Ophélie Rocher, Claire Naylies, Yannick Lippi, Isabelle P. Oswald, Sophie Lorber, Olivier Puel
International Journal of Molecular Sciences.2020; 21(18): 6660. CrossRef
Recurrent Loss of abaA, a Master Regulator of Asexual Development in Filamentous Fungi, Correlates with Changes in Genomic and Morphological Traits
Matthew E Mead, Alexander T Borowsky, Bastian Joehnk, Jacob L Steenwyk, Xing-Xing Shen, Anita Sil, Antonis Rokas, Jason E Stajich
Genome Biology and Evolution.2020; 12(7): 1119. CrossRef
The histone acetyltransferase GcnE regulates conidiation and biofilm formation in Aspergillus fumigatus
Chi-Jan Lin, Yi-Hsuan Hou, Ying-Lien Chen
Medical Mycology.2019;[Epub] CrossRef
Aspergillus fumigatus phosphoethanolamine transferase gene gpi7 is required for proper transportation of the cell wall GPI-anchored proteins and polarized growth
Haomiao Ouyang, Ting Du, Hui Zhou, Iain B. H. Wilson, Jinghua Yang, Jean-Paul Latgé, Cheng Jin
Scientific Reports.2019;[Epub] CrossRef
Identification of a Novel Transcription Factor TP05746 Involved in Regulating the Production of Plant-Biomass-Degrading Enzymes in Talaromyces pinophilus
Ting Zhang, Lu-Sheng Liao, Cheng-Xi Li, Gui-Yan Liao, Xiong Lin, Xue-Mei Luo, Shuai Zhao, Jia-Xun Feng
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The Velvet Proteins VosA and VelB Play Different Roles in Conidiation, Trap Formation, and Pathogenicity in the Nematode-Trapping Fungus Arthrobotrys oligospora
Guosheng Zhang, Yaqing Zheng, Yuxin Ma, Le Yang, Meihua Xie, Duanxu Zhou, Xuemei Niu, Ke-Qin Zhang, Jinkui Yang
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Abigail L. Lind, Fang Yun Lim, Alexandra A. Soukup, Nancy P. Keller, Antonis Rokas, Aaron P. Mitchell
mSphere.2018;[Epub] CrossRef
MybA, a new player driving survival of the conidium of the human pathogen Aspergillus fumigatus
Özlem Sarikaya Bayram, Jean Paul Latgé, Özgür Bayram
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C-terminus Proteolysis and Palmitoylation Cooperate for Optimal Plasma Membrane Localization of RasA in Aspergillus fumigatus
Qusai Al Abdallah, Adela Martin-Vicente, Ana Camila Oliveira Souza, Wenbo Ge, Jarrod R. Fortwendel
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Jun Song, Weihua Pan, Yue Sun, Jing Han, Weimin Shi, Wanqing Liao
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Hua‐Xiang Li, Zhen‐Ming Lu, Qing Zhu, Jin‐Song Gong, Yan Geng, Jin‐Song Shi, Zheng‐Hong Xu, Yan‐He Ma
PROTEOMICS.2017;[Epub] CrossRef
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Jeong-Yoon Kim
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Aspergillus fumigatus spore proteomics and genetics reveal that VeA represses DefA-mediated DNA damage response
Kwang-Soo Shin, Hee-Soo Park, Young Kim, In-Beom Heo, Young Hwan Kim, Jae-Hyuk Yu
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Hokyoung Son, Jae Yun Lim, Yoonji Lee, Yin-Won Lee, Sung-Hwan Yun
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Putative methyltransferase LaeA and transcription factor CreA are necessary for proper asexual development and controlling secondary metabolic gene cluster expression
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A Putative APSES Transcription Factor Is Necessary for Normal Growth and Development of Aspergillus nidulans: Ji-Yeon Lee , Lee-Han Kim , Ha-Eun Kim , Jae-Sin Park , Kap-Hoon Han , Dong-Min Han; J. Microbiol. 2013;51(6):800-806. Published online December 19, 2013; DOI: https://doi.org/10.1007/s12275-013-3100-2

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Abstract

The nsdD gene encoding a GATA type transcription factor positively controls sexual development in Aspergillus nidulans. According to microarray data, 20 genes that were upregulated by deleting nsdD during various life cycle stages were randomly selected and deleted for functional analysis. None of the mutants showed apparent changes in growth or development compared with those of the wild-type except the AN3154 gene that encodes a putative APSES transcription factor and is an ortholog of Saccharomyces cerevisiae swi4. Deleting AN3154 resulted in retarded growth and development, and the gene was named rgdA (retared growth and development). The rgdA deletion mutant developed a reduced number of conidia even under favorable conditions for asexual development. The retarded growth and development was partially suppressed by the veA1 mutation. The conidial heads of the mutant aborted, showing reduced and irregular shaped phialides. Fruiting body development was delayed compared with that in the wild-type. The mutant did not respond to various nutritional or environmental factors that affected the development patterns. The rgdA gene was expressed at low levels throughout the life cycle and was not significantly affected by several regulators of sexual and asexual development such as nsdD, veA, stuA, or brlA. However, the rgdA gene affected brlA and abaA expression, which function as key regulators of asexual sporulation, suggesting that rgdA functions upstream of those genes.

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Regulators of the Asexual Life Cycle of Aspergillus nidulans
Ye-Eun Son, Jae-Hyuk Yu, Hee-Soo Park
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Characterization of the mbsA Gene Encoding a Putative APSES Transcription Factor in Aspergillus fumigatus
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International Journal of Molecular Sciences.2021; 22(7): 3777. CrossRef
The Putative APSES Transcription Factor RgdA Governs Growth, Development, Toxigenesis, and Virulence in Aspergillus fumigatus
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NOTE] Isolation and Characterization of Self-Fertile Suppressors from the Sterile nsdD Deletion Mutant of Aspergillus nidulans: Dong-Beom Lee , Lee Han Kim , Jin-Pyo Kim , Kap-Hoon Han , Dong-Min Han; J. Microbiol. 2011;49(6):1054-1057. Published online December 28, 2011; DOI: https://doi.org/10.1007/s12275-011-1111-4

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Abstract: To identify downstream and/or interactive factors of the nsdD gene, which encodes a positive regulator of sexual development of Aspergillus nidulans, suppressor mutants displaying a self-fertile phenotype were isolated from a sterile nsdD deletion mutant. At least five different loci (sndA-E) were identified and genetically analyzed. In the nsdD+ background, most of the suppressors showed a marked increment of sexual development, even under the stress conditions that normally inhibited sexual development. The common phenotype of the suppressor mutants suggested the involvement of the snd genes in the negative regulation of sexual development in response to the environmental factors.

Screening of Growth- or Development-related Genes by Using Genomic Library with Inducible Promoter in Aspergillus nidulans: Bang-Yong Lee , Sang-Yong Han , Han Gil Choi , Jee Hyun Kim , Kap-Hoon Han , Dong-Min Han; J. Microbiol. 2005;43(6):523-528.; DOI: https://doi.org/2295 [pii]

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Abstract: Using the genomic library constructed at the downstream of the niiA promoter, which induces the over-expression of an inserted DNA fragment, we have attempted to screen the genes affecting growth or development by over-expression. The wild-type strain was transformed using the AMA-niiA(p) library and cultured on 1.2 M sorbitol media, in which asexual sporulation is induced, but sexual development is repressed. Over 100,000 strains transformed to pyrG+ were analyzed with regard to any changes in phenotype. Consequently, seven strains were isolated for further analyses. These strains were designated NOT [niiA(p) over-expression transformants] stains. Four of the strains were of the inducible type, and the remaining strains were of the multi-copy suppression type. Two of the inducible-type strains, NOT1 and NOT40, harbored genes which had been inserted in reverse direction, suggesting that the mutant phenotypes had been derived from an excess amount of anti-sense mRNA. Domain analyses of the deduced polypeptides from the DNA fragments rescued from the transformants revealed that NOT1, NOT40 and NOT6 harbored a LisH motif, a forkhead domain, and a Zn(II)2Cys6 binuclear zinc cluster, respectively.

Quantitative Analysis of Expressed Genes in Aspergillus Oryzae by Sequencing 3'-directed cDNA Clones: Hwang, Hyun Ah , Lee, Dong Whan , Kim, Jong Hwa , Lee, Tae Kyoo , Yang, Moon Sik , Chae, Keon Sang; J. Microbiol. 1998;36(2):111-117.

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Abstract: Sequence analysis of randomly selected 3'-directed cKNA clones has been known to be one of the most powerful methods of examining the genes highly expressed in a tissue or cell type. We constructed a 3'-directed cDNA libraty from Aspergillus oryzae mycelia, and sequenced 345 randomly selected 3'-directed cDNA clones. Determined nucleotide sequences, not shorter than 30nt, were compared with one other to generate gene signatures (GSs) and were then compared with GenBank entries to analyze sequence similarity to known genes. A GS for the most highly expressed gene appeared six times, one GS five times, five GSs four times, five GSs three times and 22 GSs twice. In total, 324 clones yielded 268 GSs consisting of 34 redundant GSs appeaning at least twice and 234 solitary ones. Forty-three GSs showed similarities ranging from 60% to 99% with known sequences from Genbank. A considerable number of A. oryzae GSs mateched those obtained from the sexual structures of A. nidulans suggests that A. oryzae may not be phylogentically distant from A. nidulans and that A. oryzae may have a sexual life cycle from the ancient period.

Promotion of Asexual Development and Inhibition of Sexual Development of Aspergillus nidulans by Short-Chain Primary Amines: Myung Hoon Song , Kuppusamy Selvam , Chang-Jun Choi , Kwang-Yeop Jahng , Dong-Min Han , Keon-Sang Chae; J. Microbiol. 2002;40(3):230-233.

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Abstract: Effects of short-chain primary amines on Aspergillus nidulans development were analyzed. Propylamine induced asexual development and inhibited sexual development. Even on medium containing lactose as the sole carbon source, on which little conidial heads are formed and sexual structures are formed preferentially, or when sexual development was induced, propylamine induced asexual development and inhibited sexual development. These effects of propylamine seemed to be due to accumulation of mRNA of the brlA gene, which has been identified as a positive regulator of asexual development, and due to the reduction of the veA mRNA level. The veA gene has been identified as an activator of sexual development and also as an inhibitor of asexual development. Other primary amines, methylamine and ethylamine, showed identical effects on development where short-chain primary amine also promoted asexual development and inhibited sexual development.

Environmental factors affecting development of Aspergillus nidulans: Kap-Hoon Han , Dong-Beom Lee , Jong-Hak Kim , Min-Su Kim , Kyu-Yong Han , Won-Shin Kim , Young-Soon Park , Heui-Baik Kim^ , Dong-Min Han^; J. Microbiol. 2003;41(1):34-40.

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Abstract: Aspergillus nidulans, a homothalic ascomycete, has a complete sexual reproductive cycle as well as an asexual one. Both sexual and asexual development are known to be genetically programmed, but are also strongly affected by environmental factors including nutrients, light, temperature and osmolarity. We have examined these factors to define favored conditions for fruiting body (cleistothecium) formation. In general, fruiting body formation was enhanced where carbon and nitrogen sources were sufficient. Limitation of C-source caused predominant asexual development while inhibiting sexual development. When higher concentrations of glucose were supplied, more cleistothecia were formed. Other carbon sources including lactose, galactose and glycerol made the fungus develop cleistothecia very well, whereas acetate caused asexual sporulation only. Organic nitrogen sources like casein hydrolysate and glycine, and an increase in nitrate or ammonium concentration also enhanced sexual development. In addition to nutrient effects, low levels of aerobic respiration, caused either by platesealing or treatment with various chemicals, favored sexual development. Carbon limitation, light exposure and a high concentration of salts promoted asexual development preferentially, suggesting that stress conditions may drive the cell to develop asexual sporulation while comfortable and wellnourished growth conditions favored sexual development.

Regulation of nsdD Expression in Aspergillus nidulans: Kap Hoon Han , Kyu-Yong Han , Min-Su Kim , Dong-Beom Lee , Jong-Hak Kim , Suhn-Kee Chae , Keon-Sang Chae , Dong-Min Han; J. Microbiol. 2003;41(3):259-261.

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Abstract: The nsdD gene has been predicted to encode a GATA type transcription factor with the type IVb zinc finger DNA binding domain functions in activating sexual development of A. nidulans. In several allelic mutants of nsdD producing truncated NsdD polypeptides lacking the C-terminal zinc finger, the transcription level of nsdD gene was greatly increased. Also in an over-expressed mutant, the transcription under its own promoter was reduced. These results suggest that the expression of nsdD is negatively autoregulated. When the nsdD gene was over-expressed, cleistothecia were formed in excess amounts even in the presence of 0.6M KCl that inhibited sexual development of the wild type. Northern blot analysis revealed that the expression of nsdD was repressed by 0.6M KCl. These results strongly suggest that the inhibition of sexual development by salts was carried out via the nsdD involved regulatory network.

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