🧬 biology

Bioactivity of crude extract from marine-derived Streptomyces avermitilis BIOTECP1C4 against Staphylococcus aureus: antimicrobial, antibiofilm and antivirulence evaluation

This study demonstrates that the ethyl acetate crude extract of the marine-derived *Streptomyces avermitilis* BIOTECP1C4 exhibits moderate antibacterial, antibiofilm, and antivirulence activities against *Staphylococcus aureus* with low toxicity, suggesting its potential as a source of novel antimicrobial agents pending further purification.

Emanuelle Araújo, Elian Chaves Ribeiro, José Silva Domendes, Rafaela Lobato Silva, Maria Clara Miranda Freire, Lívia Cor (…)2026-06-30
🧬 biology

Transcriptomic Characterization of Hypermutated Microsatellite Stable Tumors Reveals Distinct Proliferative and Immune Signatures

This study characterizes hypermutated microsatellite stable tumors across colorectal and endometrial cancers as a distinct biological subgroup defined by shared upregulation of immune and proliferative pathways (such as mTORC1, E2F, and G2M checkpoints) alongside cancer-specific regulatory features, notably involving SLC7A11 and microRNA interactions.

Olesia Kondrateva, Thimona Chrusciel, Maria Anisimova2026-06-30
🧬 biology

The impact of nationwide folic acid fortification on genetic variants associated with conotruncal heart defects

This study utilized genome-wide association analyses to demonstrate that universal folic acid fortification is associated with shifts in the prevalence of specific genetic variants in cardiac developmental pathways, particularly within the DHRS3 and PPARGC1β genes, among children with conotruncal heart defects.

Sarah U. Morton, Enrique Mondragon-Estrada, Rui Qian, Omobola O. Oluwafemi, Kit Sing Au, Hope Northrup, Wendy K. Chung (…)2026-06-30
🧬 biology

Disruption of lysine biosynthesis modulates DNA methylation and developmental programs in Arabidopsis thaliana

This study demonstrates that disrupting lysine biosynthesis via DAPAT deficiency in *Arabidopsis thaliana* reprograms developmental timing and reproductive output by altering DNA methylation patterns and the expression of key flowering regulators, thereby revealing a critical metabolic-epigenetic link between amino acid metabolism and plant growth.

Wagner Araujo, Débora Gouveia, Samantha Flachbart, Wesley Barrios, Philipp Westhoff, Pedro Reis, Alisdair Fernie, Adrian (…)2026-06-29
🧬 biology

Targeted siRNA-Lactobionic Lipid Nanoparticles with Novel Ionizable Lipid Inhibit Antithrombin III Expression in Hepatocytes

This study demonstrates that a novel targeted lipid nanoparticle formulation, incorporating a morpholine-based ionizable lipid and a lactobionic-octadecylamine conjugate, efficiently delivers siRNA to hepatocytes to achieve robust knockdown of antithrombin III with low cytotoxicity, offering a promising therapeutic strategy for bleeding disorders.

Ali Rajabi Zangi, Seyed Hossein Kiaie, Seyed Milad Safar Sajadi, Hamid Reza Heidari, Hamed Hamishehkar, Yousef Javadzade (…)2026-06-29
🧬 biology

Transcriptomic Insights into Bipolar Disorder: Identifying Mood-States Master Regulators and Key Biological Processes

This study integrates transcriptomic data from 165 blood samples to identify 59 master regulator genes, including the universal biomarker DMTF1 and mood-state-specific regulators, which illuminate distinct biological processes underlying bipolar disorder across acute episodes and remission.

Paola Rampelotto Ziani, Marco Antônio Bastiani, Gabriel Henrique Hizo, Giovana Mezzomo, Tainá Schons, Pedro Henrique Ros (…)2026-06-29
🧬 biology

Hybrid G-Quadruplex and i-Motif Formation in G/C-Rich Repeat DNA: Beyond the Competitive Paradigm

This study challenges the conventional view of G-quadruplexes and i-motifs as mutually exclusive structures by demonstrating that G/C-rich tandem repeat sequences can form stable, pH-responsive hybrid architectures where protonation-dependent interactions couple these non-canonical conformations, thereby expanding our understanding of structural plasticity in genomic regions.

Lukáš Trizna, Adriana Varha, Timea Melegová, Viktor Víglaský2026-06-29