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Use of a Regression Model to Study Host-Genomic Determinants of Phage Susceptibility in MRSA
Henrike Zschach1, Mette V Larsen2, Henrik Hasman3
1Department of Bio and Health Informatics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark. henrike@bioinformatics.dtu.dk.
Abstract:
Staphylococcus aureus is a major agent of nosocomial infections. Especially in methicillin-resistant strains, conventional treatment options are limited and expensive, which has fueled a growing interest in phage therapy approaches. We have tested the susceptibility of 207 clinical S. aureus strains to 12 (nine monovalent) different therapeutic phage preparations and subsequently employed linear regression models to estimate the influence of individual host gene families on resistance to phages. Specifically, we used a two-step regression model setup with a preselection step based on gene family enrichment. We show that our models are robust and capture the data's underlying signal by comparing their performance to that of models build on randomized data. In doing so, we have identified 167 gene families that govern phage resistance in our strain set and performed functional analysis on them. This revealed genes of possible prophage or mobile genetic element origin, along with genes involved in restriction-modification and transcription regulators, though the majority were genes of unknown function. This study is a step in the direction of understanding the intricate host-phage relationship in this important pathogen with the outlook to targeted phage therapy applications.
Insights
Bacteriophage therapy shows promise for treating Staphylococcus aureus infections. Researchers identified 167 gene families influencing phage resistance, paving the way for targeted phage therapy strategies.
Area of Science:
- Microbiology
- Genetics
- Infectious Diseases
Background:
- Staphylococcus aureus is a significant cause of hospital-acquired infections.
- Methicillin-resistant strains present limited and costly treatment options.
- Phage therapy is an emerging alternative for bacterial infections.
Purpose of the Study:
- To investigate host genetic factors influencing Staphylococcus aureus resistance to bacteriophages.
- To identify specific gene families involved in phage susceptibility.
- To provide insights for developing targeted phage therapy.
Main Methods:
- Tested susceptibility of 207 clinical S. aureus strains to 12 phage preparations.
- Employed two-step linear regression models with gene family enrichment preselection.
- Validated model robustness by comparing to randomized data models.
Main Results:
- Identified 167 gene families significantly associated with phage resistance.
- Functional analysis revealed genes related to prophages, mobile genetic elements, restriction-modification systems, and transcription regulation.
- A majority of identified genes were of unknown function.
Conclusions:
- Host gene families play a crucial role in Staphylococcus aureus phage resistance.
- Understanding these genetic determinants is key to advancing targeted phage therapy.
- This research contributes to deciphering the complex host-phage interactions in S. aureus infections.
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