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Fitness costs of Mycobacterium tuberculosis resistant to rifampicin is compensated by rapid Th2 polarization mediated by early and high IL-4 production during mice infection.
Sci Rep
January 2025
Experimental Pathology Department, National Institute of Medical Sciences and Nutrition Salvador Zubiran, Mexico City, Mexico.
It was a general belief that drug resistance in Mycobacterium tuberculosis (Mtb) was associated with lesser virulence, particularly rifampicin resistance, which is usually produced by mutations in the RNA polymerase Beta subunit (RpoB). Interestingly, this kind of bacterial mutations affect gene transcription with significant effects on bacterial physiology and metabolism, affecting also the bacterial antigenic constitution that in consequence can produce diverse immune responses and disease outcome. In the present study, we show the results of the Mtb clinical isolate A96, which is resistant to rifampicin and when used to infect BALB/c mice showed hypervirulence, apparently by rapidly polarization of the Th2 immune response through early and high production of IL-4.
View Article and Find Full Text PDFPrecise modelling of mitochondrial diseases using optimized mitoBEs.
Nature
January 2025
Changping Laboratory, Beijing, The People's Republic of China.
The development of animal models is crucial for studying and treating mitochondrial diseases. Here we optimized adenine and cytosine deaminases to reduce off-target effects on the transcriptome and the mitochondrial genome, improving the accuracy and efficiency of our newly developed mitochondrial base editors (mitoBEs). Using these upgraded mitoBEs (version 2 (v2)), we targeted 70 mouse mitochondrial DNA mutations analogous to human pathogenic variants, establishing a foundation for mitochondrial disease mouse models.
View Article and Find Full Text PDFARID1A mutations protect follicular lymphoma from FAS-dependent immune surveillance by reducing RUNX3/ETS1-driven FAS-expression.
Cell Death Differ
January 2025
Laboratory for Experimental Leukemia and Lymphoma Research (ELLF), LMU University Hospital, Munich, Germany.
The cell death receptor FAS and its ligand (FASLG) play crucial roles in the selection of B cells during the germinal center (GC) reaction. Failure to eliminate potentially harmful B cells via FAS can lead to lymphoproliferation and the development of B cell malignancies. The classic form of follicular lymphoma (FL) is a prototypic GC-derived B cell malignancy, characterized by the t(14;18)(q32;q21)IGH::BCL2 translocation and overexpression of antiapoptotic BCL2.
View Article and Find Full Text PDFYgiV promoter mutations cause resistance to cystobactamids and reduced virulence factor expression in Escherichia coli.
NPJ Antimicrob Resist
November 2024
Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI) and Saarland University Department of Pharmacy, Campus Building E8.1, 66123, Saarbrücken, Germany.
Antimicrobial resistance is one of the major health threats of the modern world. Thus, new structural classes of antimicrobial compounds are needed in order to overcome existing resistance. Cystobactamids represent one such new compound class that inhibit the well-established target bacterial type II topoisomerases while exhibiting superior antibacterial and resistance-breaking properties.
View Article and Find Full Text PDFRegulatory non-coding somatic mutations as drivers of neuroblastoma.
Br J Cancer
January 2025
University of Naples Federico II, Department of Molecular Medicine and Medical Biotechnology, Naples, Italy.
Background: Emerging evidence suggests that non-coding somatic single nucleotide variants (SNVs) in cis-regulatory elements (CREs) contribute to cancer by disrupting gene expression networks. However, the role of non-coding SNVs in cancer, particularly neuroblastoma, remains largely unclear.
Methods: SNVs effect on CREs activity was evaluated by luciferase assays.
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