Current Clinical Microbiology Reports最新文献

Purpose of review: It is now evident that the microorganisms living on and inside the human body modulate a myriad of host responses and activities. Particularly, the intestinal microbiota, which comprises diverse bacteria, fungi, archaea, viruses, and eukaryotic entities, forms a close relationship with the host. This relationship is essential for optimal biological function such as maintaining proper immune homeostasis, host metabolism, and prevention of pathogens colonization. The human gut microbiome is relatively stable after 3 years of age but is subjected to influences from diet, environment and lifestyle factors. This review covers recent findings on how lifestyle factors associated with modern society might affect the microbiome.

Recent findings: Modern lifestyle factors including circadian rhythm disruption, sleep deprivation, exercise and stress impact the gut bacterial community (bacteriome) composition and function. The resultant gut bacteriome changes contribute to host metabolism dysregulation, inflammatory diseases and cancer development associated with these lifestyle factors.

Summary: Lifestyle factors influence the gut bacteriome to modulate host health and disease risks. Understanding the mechanistic roles of diverse host-associated microorganisms played in lifestyle factors-associated disease risks holds the promise for developing novel approaches to alleviate the detrimental effects.

Purpose of review: This review explores the application of classical ecological theory to host-associated microbiomes during initial colonization, maintenance, and recovery. We discuss unique challenges of applying these theories to host-associated microbiomes and host factors to consider going forward.

Recent findings: Recent studies applying community ecology principles to host microbiomes continue to demonstrate a role for both selective and stochastic processes in shaping host-associated microbiomes. However, ecological frameworks developed to describe dynamics during homeostasis do not necessarily apply during diseased or highly perturbed states, where large variations can potentially lead to alternate stable states.

Summary: Despite providing valuable insights, the application of ecological theories to host-associated microbiomes has some unique challenges. The integration of host-specific factors, such as genotype or immune dynamics in ecological models or frameworks is crucial for understanding host microbiome assembly and stability, which could improve our ability to predict microbiome outcomes and improve host health.

Purpose of review: Long-read sequencing (LRS) has revolutionized pathogen surveillance by enabling real-time, high-fidelity genomic analysis critical for outbreak response. This review synthesizes recent breakthroughs in LRS, evaluating its impact on genomic epidemiology, metagenomics, and public health decision-making while addressing limitations and prospects for integrating LRS into global outbreak surveillance.

Recent findings: Unlike short-read sequencing, LRS-pioneered by Oxford Nanopore Technologies (ONT) and Pacific Biosciences (PacBio)-resolves complex genomic structures, antimicrobial resistance determinants, and transmission dynamics with unprecedented accuracy. The portability of some LRS devices has facilitated rapid pathogen identification in field settings, notably during the Ebola and COVID-19 pandemics. Despite advancements in basecalling algorithms and target enrichment, challenges including sequencing errors, computational bottlenecks, and cost barriers remain.

Summary: By critically evaluating recent findings and discussing future directions, this review highlights the importance of leveraging LRS for outbreak preparedness and response, equipping researchers and public health professionals with the knowledge necessary to navigate the complexities of modern infectious disease challenges.

Purpose of the review: SARS-CoV-2 undergoes genetic mutations like many other viruses. Some mutations lead to the emergence of new Variants of Concern (VOCs), affecting transmissibility, illness severity, and the effectiveness of antiviral drugs. Continuous monitoring and research are crucial to comprehend variant behavior and develop effective response strategies, including identifying mutations that may affect current drug therapies.

Recent findings: Antiviral therapies such as Nirmatrelvir and Ensitrelvir focus on inhibiting 3CLpro, whereas Remdesivir, Favipiravir, and Molnupiravir target nsp12, thereby reducing the viral load. However, the emergence of resistant mutations in 3CLpro and nsp12 could impact the efficiency of these small molecule drug therapeutics.

Summary: This manuscript summarizes mutations in 3CLpro and nsp12, which could potentially reduce the efficacy of drugs. Additionally, it encapsulates recent advancements in small molecule antivirals targeting SARS-CoV-2 viral proteins, including their potential for developing resistance against emerging variants.

Purpose of review: Bacterial infections and antibiotic resistance contribute to global mortality. Despite many infections being preventable and treatable, the lack of reliable and accessible diagnostic tools exacerbates these issues. CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats)-based diagnostics has emerged as a promising solution. However, the development of CRISPR diagnostics has often occurred in isolation, with limited integration of genomic data to guide target selection. In this review, we explore the synergy between bacterial genomics and CRISPR-based point-of-care tests (POCT), highlighting how genomic insights can inform target selection and enhance diagnostic accuracy.

Recent findings: We review recent advances in CRISPR-based technologies, focusing on the critical role of target sequence selection in improving the sensitivity of CRISPR-based diagnostics. Additionally, we examine the implementation of these technologies in resource-limited settings across Asia and Africa, presenting successful case studies that demonstrate their potential.

Summary: The integration of bacterial genomics with CRISPR technology offers significant promise for the development of effective point-of-care diagnostics.

Purpose of review: Numerous studies concluded stress (acute, episodic acute, or chronic) increases the incidence of human alpha-herpes virus 1 (HSV-1) reactivation from latency in neurons. This review will summarize how stress stimulates viral gene expression, replication, and reactivation from latency.

Recent findings: Stress (capital S) stress-mediated activation of the glucocorticoid receptor (GR) accelerates reactivation from latency, whereas a corticosteroid-specific antagonist impairs viral replication and reactivation from latency. GR and specific stress-induced cellular transcription factors also stimulate viral promoters that drive expression of key viral transcriptional regulators: infected cell protein 0 (ICP0), ICP4, ICP27 and viral tegument protein (VP16). Hence, GR is predicted to initially stimulate viral gene expression. GR-mediated immune-inhibitory functions are also predicted to enhance viral replication and viral spread.

Summary: Identifying cellular factors and viral regulatory proteins that trigger reactivation from latency in neurons may provide new therapeutic strategies designed to reduce the incidence of reactivation from latency.