Molecular Mechanisms of Staphylococcus Epidermidis Strain Diversity

表皮葡萄球菌菌株多样性的分子机制

• 批准号: 10539139
• 负责人: Julia S Oh
• 金额: $ 9.68万
• 依托单位: JACKSON LABORATORY
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-01-15 至 2022-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10539139
• 关键词: Address; Admixture; Affect; Bacteria; Behavior; Candidate Disease Gene; Characteristics; Clonal Expansion; Clustered Regularly Interspaced Short Palindromic Repeats; Disease; Ecosystem; Environment; Gene Expression Profiling; Gene Targeting; Genes; Genetic; Genetic Heterogeneity; Genetic Transcription; Genetic Variation; Genetic study; Genome; Genomic approach; Goals; Growth; Guide RNA; Health; Health Promotion; Homeostasis; Human; Immune system; In Vitro; Individual; Infection; Infection prevention; Infectious Skin Diseases; Inflammation; Investigation; Knowledge; Life Style; Medical Device; Metabolism; Methods; Molecular; Mucous Membrane; Pathogenicity; Patients; Phenotype; Phylogenetic Analysis; Physiology; Population; Positioning Attribute; Process; Public Health; RNA Sequences; Regulation; Repression; Role; Sepsis; Site; Skin; Skin colonization; Staphylococcus epidermidis; Testing; Therapeutic; Virulence; base; design; disorder risk; experimental study; fitness; gene function; gene network; genetic architecture; genetic strain; genome-wide; immunoregulation; improved; in vivo; insight; knock-down; medical implant; member; microbial; microbial community; mucosal microbiota; pan-genome; pathogen; prevent; screening; skin disorder; skin microbiome; skin microbiota; success; tool; whole genome

PROJECT SUMMARY / ABSTRACT Staphylococcus epidermidis is a ubiquitous member of the human skin and mucosal microbiota. Functionally, it is a key contributor to human health via immune modulation and microbial community homeostasis. Yet the ‘commensal’ S. epidermidis is also an important pathogen and disease risk reservoir—it is the most frequent cause of medical device and bloodstream infections. Multiple phylogenetically diverse subspecies, or strains, of S. epidermidis can co-inhabit the skin with genomes of variable gene content. The overwhelming majority of these genes have unknown function. We hypothesize that this variable gene content, or accessory genome, interacts with core genes to enable strains to uniquely respond to and thrive in different environments, and that mixing of these genetically diverse strains is necessary to maintain a healthy homeostasis in the skin. To investigate the function of these genes and to understand how genetic diversity at the strain level contributes to population-level phenotype, we will functionally profile a set of phylogenetically diverse strains isolated from healthy individuals and individuals with bloodstream infections. We will create CRISPRi tools for gene knockdown in S. epidermidis to systematically identify strain-specific and core genes that underlie the ability to colonize and compete in the skin and infections. Aim 1 develops the CRISPRi genetic toolkit to created pooled S. epidermidis knockdown pools. Phenotypic profiling these pools will greatly expand our knowledge of important commensal strategies employed by a common microbial partner, and how genetic heterogeneity may impact the commensal to infectious transition. Aim 2 investigates the role of strain admixture in this transition. This combination of genomic approaches and mechanistic studies will provide the first investigation into the function of the S. epidermidis pangenome. Annotating inter-strain genetic diversity will reveal new insights into the functional consequence of strain diversity: how strains can successfully transition between commensal and virulence lifestyles, and how multiple strains can co-exist in an ecological network.

项目摘要/摘要