Mostly Microbes and Infection - by David Ojcius

A 10-year study of 154 ocular MRSA isolates in Taiwan found major shifts in bacterial clones, with formerly dominant CC59 declining and fluoroquinolone-resistant CC8 increasing. While CC59 remained highly susceptible to fluoroquinolones, CC8 showed marked resistance, raising concerns about standard empirical treatment for eye infections and underscoring the need for ongoing molecular surveillance.

Lors de ma balade au Bois de Vincennes, j’ai vu ces champignons. L' IA pense qu’il s’agit d’un poulet-des-bois (Laetiporus spp.), mais avec seulement 80 % de certitude... donc 80 % de confiance aussi pour sa comestibilité. 🙃🍄

Using chemically induced  Effector-Triggered Immunity ( ETI) and single-cell transcriptomics in Arabidopsis leaves, researchers show that although pathogen effectors are broadly perceived, individual cell types mount distinct immune responses. A shared defense core is complemented by specialized programs shaped by cell identity and chromatin state. Epidermal regulators are crucial for preventing pathogen entry, revealing a layered, spatially organized plant immune system.

Scientists identified TgPRO, the first dedicated regulator of metabolic gene expression in apicomplexan parasites. In Toxoplasma gondii , TgPRO helps parasites adapt to crowding-induced oxidative stress by controlling genes involved in carbon metabolism and iron-sulfur cluster assembly. Loss of TgPRO increased reactive oxygen species and reduced fitness, revealing a convergently evolved metabolic control mechanism.

Researchers found that insoluble dietary fiber slows colorectal cancer progression in mice by altering gut microbiota and reducing production of the tumor-promoting ganglioside GM3. Fiber lowered levels of Paramuribaculum intestinale and a glycosphingolipid-related microbial enzyme, while GM3 was shown to stimulate tumor growth and inhibit cancer cell apoptosis.

Three Chlamydia species infect humans: C. trachomatis , C. pneumoniae and C. psittaci . C. trachomatis is the leading bacterial sexually transmitted infection, often asymptomatic but capable of causing pelvic inflammatory disease, infertility and neonatal infections. It also causes trachoma, a major source of preventable blindness. C. pneumoniae causes respiratory illnesses and may be linked to cardiovascular disease. Chlamydial infections occur worldwide, with trachoma concentrated in poorer regions. Globally, about 89 million new sexually transmitted cases arise annually.