UNMC_Acronym_Vert_sm_4c
University of Nebraska Medical Center

Marilynn A. Larson, PhD

Assistant Professor, UNMC Department of Pathology, Microbiology and Immunology
Faculty, UNMC Immunology, Pathology and Infectious Disease Graduate Program
Laboratory Director, UNMC Biosafety Level 3 Core Facility
Fellow, National Strategic Research Institute

Larson Laboratory

Marilynn A. Larson, PhD, is a molecular microbiologist specializing in characterizing select agent pathogens. She is an assistant professor in the UNMC Department of Pathology, Microbiology and Immunology, and also is on the faculty of the UNMC Immunology, Pathology and Infectious Disease Graduate Program.

Dr. Larson  is a fellow in the National Strategic Research Institute of Nebraska. 

As laboratory director of the UNMC Biosafety Level 3 Core Facility, Dr. Larson oversees all aspects of this secure resource to ensure the biosafety of authorized individuals. She also provides guidance on select agent procedures and regulatory compliance matters required by the Centers for Disease Control and Prevention and assists with biological select agent and toxin associated projects for the Department of Defense. She is a member of the High Containment Working Group and Biosafety and Incident Command Committee.

She educates other individuals on various aspects of translational and mechanistic research for the prevention and treatment of infectious diseases, including the evaluation of compounds with drug-like physicochemical properties, the characterization of bacteriophages, the assessment of multivalent subunit vaccines, the development of accurate identification methods for select agents, and the complete assembly and evaluation of genomes, one of which resulted in the reclassification of Wolbachia persica to Francisella persica.

Dr. Larson’s current research is focused on determining the molecular mechanisms that allow the intracellular pathogen Francisella tularensis to persist, rapidly replicate, and then promote apoptosis in infected host cells, further spreading the infection of this hypervirulent Tier 1 select agent that is fatal if not promptly treated. 

Education & Training
  • BS: General sciences, University of Nebraska-Lincoln.
  • MS:, Biology (molecular microbiology), University of Nebraska Omaha.
  • PhD: Biological sciences, University of Nebraska-Lincoln.
  • Post-doctoral Training: UNMC.
Research
Research in the Larson laboratory focuses on elucidating the molecular mechanisms used by the zoonotic and Tier 1 select agent Francisella tularensis that contributes to the effective modulation of infected host cells for intracellular pathogen persistence and proliferation. F. tularensis subpopulations infect numerous species and cell types but differ substantially in virulence with the subtype A.I clade comprising some of the most pathogenic bacteria known. Although macrophages are a critical component for the first-line defense against pathogens, these immune cells are the primary replication niche for F. tularensis during an infection. Therefore, the Larson laboratory has developed a primary human macrophage infection model using F. tularensis subtype A.I to study gene expression and the associated metabolic pathways that contribute to macrophage dysfunction when infected by this hypervirulent intracellular pathogen. The goal of these studies is to identify pathways and targets that will assist in intracellular pathogen clearance and provide a better understanding of immunometabolomic modulation in dysregulated macrophages that contributes to immunotolerance and immunosuppression. The data obtained from these studies along with a systems biology approach is being utilized to develop a F. tularensis-macrophage interactome model with open-access for other researchers to confirm and build upon.
Expertise/Area of Focus
Tier 1 Select Agent Francisella tularensis Pathogenesis, Immunometabolomic Modulation of Human Macrophages, Host-pathogen Interactions and Systems Biology Modeling, and BSL-3 Select Agent Research Project Development
Honors & Awards
  • Licensed Technology Innovative Research Award, UNMC.
  • Research Innovation Award, UNMC.
  • Graduate Thesis Scholarship, University of Nebraska Omaha.
  • Rhoden Summer Fellowship, University of Nebraska Omaha
  • Paul and Edith Babson Science Scholarship, University of Nebraska-Lincoln
Professional Memberships
  • Tularemia International Society
  • International Society for Infectious Diseases
  • American Society for Microbiology
  • Sigma Xi Scientific Research Society