Organisms Commons^™

Cryptococcus Neoformans Melanization Incorporates Multiple Catecholamines To Produce Polytypic Melanin, Rosanna P. Baker, Christine Chrissian, Ruth E. Stark, Arturo Casadevall

Publications and Research

Melanin is a major virulence factor in pathogenic fungi that enhances the ability of fungal cells to resist immune clearance. Cryptococcus neoformans is an important human pathogenic fungus that synthesizes melanin from exogenous tissue catecholamine precursors during infection, but the type of melanin made in cryptococcal meningoencephalitis is unknown. We analyzed the efficacy of various catecholamines found in brain tissue in supporting melanization using animal brain tissue and synthetic catecholamine mixtures reflecting brain tissue proportions. Solid-state NMR spectra of the melanin pigment produced from such mixtures yielded more melanin than expected if only the preferred constituent dopamine had been incorporated, …

Deletion Of The Stress Response Gene Ddr48 From Histoplasma Capsulatum Increases Sensitivity To Oxidative Stress, Increases Susceptibility To Antifungals, And Decreases Fitness In Macrophages, Logan T. Blancett, Kauri A. Runge, Gabriella M. Reyes, Lauren A. Kennedy, Sydney C. Jackson, Sarah E. Scheuermann, Mallory B. Harmon, Jamease C. Williams, Glenmore Shearer

Faculty Publications

The stress response gene DDR48 has been characterized in Saccharomyces cerevisiae and Candida albicans to be involved in combating various cellular stressors, from oxidative agents to antifungal compounds. Surprisingly, the biological function of DDR48 has yet to be identified, though it is likely an important part of the stress response. To gain insight into its function, we characterized DDR48 in the dimorphic fungal pathogen Histoplasma capsulatum. Transcriptional analyses showed preferential expression of DDR48 in the mycelial phase. Induction of DDR48 in Histoplasma yeasts developed after treatment with various cellular stress compounds. We generated a ddr48∆ deletion mutant to further …

Micronutrient Supplements Can Promote Disruptive Protozoan And Fungal Communities In The Developing Infant Gut, Ana Popovic, Celine Bourdon, Pauline W. Wang, David S. Guttman, Sajid Bashir Soofi, Zulfiqar Ahmed Bhutta, Robert H J. Bandsma, John Parkinson, Lisa G. Pell

Centre of Excellence in Women and Child Health

Supplementation with micronutrients, including vitamins, iron and zinc, is a key strategy to alleviate child malnutrition. However, association of gastrointestinal disorders with iron has led to ongoing debate over their administration. To better understand their impact on gut microbiota, we analyse the bacterial, protozoal, fungal and helminth communities of stool samples collected from a subset of 80 children at 12 and 24 months of age, previously enrolled into a large cluster randomized controlled trial of micronutrient supplementation in Pakistan (ClinicalTrials.gov identifier NCT00705445). We show that while bacterial diversity is reduced in supplemented children, vitamins and iron (as well as …

Impact Of Pulse Oximetry On Hospital Referral Acceptance In Children Under 5 With Severe Pneumonia In Rural Pakistan (District Jamshoro): Protocol For A Cluster Randomised Trial, Fatima Mir, Apsara Ali, Suhail Chanar, Amjad Hussain, Arjumand Rizvi, Imran Ahmed, Zahid Memon, Atif Habib, Sajid Bashir Soofi, Zulfiqar Ahmed Bhutta

Department of Paediatrics and Child Health

Background: Pneumonia is a leading cause of death among children under 5 specifically in South Asia and sub-Saharan Africa. Hypoxaemia is a life-threatening complication among children under 5 with pneumonia. Hypoxaemia increases risk of mortality by 4.3 times in children with pneumonia than those without hypoxaemia. Prevalence of hypoxaemia varies with geography, altitude and severity (9%-39% Asia, 3%-10% African countries). In this protocol paper, we describe research methods for assessing impact of Lady Health Workers (LHWs) identifying hypoxaemia in children with signs of pneumonia during household visits on acceptance of hospital referral in district Jamshoro, Sindh.
Methods and analysis: A …

Molecular Detection Of Aspergillus Flavus In Georgia Peanut, Variety Tifguard., Carolle Zolome

Symposium of Student Scholars

Peanuts provide a good source of protein, minerals, and vitamins to consumers. The US peanut industry suffers great losses of nearly $26 million annually due to contamination by Aspergillus species. In spite of strict control measures against Aspergillus species, the industry is still facing economic loss due to contamination by this mold. Poor storage of peanuts in commercial outlets can lead to infection by the mold, releasing aflatoxin which is carcinogenic. A number of DNA based techniques are currently available for identification of the fungal population. This research aims at identifying if peanut, the variety Tifguard which is highly recommended …

Effects Of Neem Oil On Growth And Development Of Aspergillus Flavus In Peanuts, Onachukwu Nwolisa

Symposium of Student Scholars

Effects of Neem Oil On Growth And Development Of Aspergillus flavus in peanuts**

Ona Nwolisa and Premila N Achar¹

¹Dept. of Molecular and Cellular Biology, Kennesaw State University, Kennesaw, GA.

Aspergillus flavus is known to contaminate peanuts and produce aflatoxin which are carcinogenic metabolites. According to the USDA, more than $1 billion is spent on infection and prevention. Currently there is no single method known to eradicate Aspergillus spp. in peanuts and the industry continue to face the aflatoxin problem. There has been an increased interest in use of plant based antifungal products which are environmentally friendly and …

Effects Of Trans-Acting Factors On The Translational Machinery In Yeast, Brandon M. Trainor

Graduate School of Biomedical Sciences Theses and Dissertations

Synthesis of proteins, or translation, is a complex biological process requiring the coordinated effort of numerous protein and RNA factors. Central to translation is the ribosome, a complex macromolecular complex consisting of both ribosomal RNA (rRNA) and ribosomal protein (r-protein). Ribosomes are essential and are one of the oldest and most abundant biomolecules across all forms of life. In addition to the ribosome, translation requires messenger RNA (mRNA), transfer-RNA conjugated to an amino acid (aa-tRNA), translation factors, and energy in the form of ATP and GTP. Translation universally occurs in four major stages, initiation, elongation, termination, and recycling, with initiation …

Fungi: Are They Plants Or Animals?, Himanshu Yn, Sufyan Ibrahim, Revathi P. Shenoy Dr

Manipal Journal of Medical Sciences

The status of fungi in the phylogenetic setup still continues to be an intriguing question in biological sciences. Having long been considered as close relatives of plants, over the years, their resemblance towards animals has been brought into the greater limelight. While the vast diversity of the group demands a separate kingdom, evolution biology coaxes us to trace back their ancestry and establish similarities between different kingdoms and as newer pieces of evidence emerge up, the question as to whether fungi are plants or animals, remains contentious.

Telomeric And Sub-Telomeric Structure And Implications In Fungal Opportunistic Pathogens, Raffaella Diotti, Michelle Esposito, Chang Hui Shen

Publications and Research

Telomeres are long non-coding regions found at the ends of eukaryotic linear chromosomes. Although they have traditionally been associated with the protection of linear DNA ends to avoid gene losses during each round of DNA replication, recent studies have demonstrated that the role of these sequences and their adjacent regions go beyond just protecting chromosomal ends. Regions nearby to telomeric sequences have now been identified as having increased variability in the form of duplications and rearrangements that result in new functional abilities and biodiversity. Furthermore, unique fungal telomeric and chromatin structures have now extended clinical capabilities and understanding of pathogenicity …

289— Phenotypic Characterization Of Neurospora Crassa Fsd-1 Overexpression Strains, Hannah Smith

GREAT Day Posters

Neurospora crassa is a model filamentous fungal organism that can reproduce both asexually and sexually. Little is known about the molecular mechanisms that regulate the N. crassa female sexual development cycle. The transcription factor fsd-1 is necessary for sexual development, and fsd-1 deletion strains show delayed development of female reproductive structures and are sterile. Through previous experiments, we have been able to determine that there are three different transcripts of the fsd-1 gene, which differ by the length and intron/exon structure of their 5’ untranslated region. This project focuses on phenotypically characterizing the reproductive ability of strains overexpressing fsd-1, for …

Purification And Functional Characterization Of The Iron-Responsive Transcription Factor Aft1 From C. Glabrata, Jade Ikahihifo-Bender

Senior Theses

Due to its unique ability to serve as both an electron donor and acceptor, iron is utilized as a co-factor for many biological processes, including electron transfer, oxygen binding, and vitamin synthesis. Iron is also a key factor during fungal infections as the human host and invading pathogens battle over limited iron pools. The primary iron-responsive transcription factor Aft1 in the opportunistic pathogenic yeast Candida glabrata responds to iron deficiency by activating expression of iron acquisition genes. However, the mechanisms for sensing intracellular iron levels and regulating Aft1 activity in response to iron are unknown. The C. glabrata iron regulation …

Microbiological Study In A Gneissic Cave From Sri Lanka, With Special Focus On Potential Antimicrobial Activities, Ethige Isuru P. Silva, Pathmakumara Jayasingha, Saman Senanayake, Anura Dandeniya, Dona Helani Munasinghe

International Journal of Speleology

The emergence of antibiotic resistance is a global health crisis, thus the search for novel antimicrobial compounds has become a continuous necessity. Underexplored and extreme environments, such as cave ecosystems, have been identified as a promising potential source for the discovery of novel microorganisms with novel antimicrobial compounds (AMC). This study presents the first cave microbiological investigation in Sri Lanka, with a special preference for bioprospecting of novel AMC. The cave sediment characterization demonstrated the presence of close to strong acidic conditions (pH 3.1 – 3.3) and thus indicates the possibility of isolating acidophilic microorganisms. Eight cave wall/ceiling fungal strains …

Sociodemographic, Clinical Characteristics, And Outcomes Of Influenza Pneumonia Patients Admitted In A Tertiary Care Hospital In Karachi, Pakistan: Findings From A Cross-Sectional Study, Fazal Ur Rehman, Muhammad Arslan Ahmed, Kashif Aziz, Mahmooda Jabeen Ashraf, Tazein Amber, Sumera Aziz Ali

Section of Internal Medicine

Objective: To determine the sociodemographic, clinical characteristics, and outcomes of influenza pneumonia patients in tertiary care hospital, Karachi Pakistan.
Study design: A cross-sectional study.
Place and duration of study: The Aga Khan University Hospital Karachi Pakistan from January 2013 to December 2018. Methodology: All adult patients who were older than 18 years and suspected to have viral pneumonia were included in the study. Data were abstracted on 105 patients and were entered on preformed proforma after reviewing the files of patients.
Results: Ninety-four (89.5%) patients were influenza positive and 15.2% (n=16) had been vaccinated. Around 92.4% (n=97), 81.9% (n=86) and …

Covid-19 Presenting With Spontaneous Pneumothorax, Intisar Ahmed, Hunaina Shahab, Muhammad Arslan Ahmed, Muhammad Sohaib

Section of Cardiology

The coronavirus disease 2019 (COVID-19) is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The disease mainly affects respiratory system. Its common clinical findings include fever, cough and shortness of breath. Characteristic radiological features of the disease include peripherally distributed, bilateral ground-glass opacities, predominantly involving the lower lung zones. In this report, we present a case of COVID-19 disease presenting with spontaneous pneumothorax. A 26-year male patient was admitted to the Emergency Department with fever, dry cough, shortness of breath and right-sided chest pain. Radiographic imaging of the patient revealed pneumothorax on the right and peripherally distributed non-homogenous opacification. …