A single dose edited 49% of liver cells in mice — without a virus

Key Findings

🤖 AI + a compact nuclease = 81.9% editing efficiency in human cells

• A deep learning framework identified beneficial mutations in SpuFz1 (a compact, naturally occurring gene-editing enzyme from eukaryotes), producing a multi-mutant variant with an 11.6-fold increase in editing efficiency — without needing experimental training data to build the model.
• In parallel, a redesigned guide RNA scaffold was compressed from its original length down to just 75 nucleotides — a 79% reduction — while maintaining editing activity.
• The combined system, called enFanzor, reached up to 81.9% editing efficiency in mammalian cells, and showed strong performance in human blood stem cells and mouse embryos.
• The shorter guide RNA also improved editing specificity and increased base editing efficiency.

🦠 84 gene-edited mouse lines revealed 17 flu resistance factors

• A library of 84 CRISPR-Cas9-generated mouse lines — each missing one host gene — was built to systematically test which human-like genes help influenza A virus infect and replicate.
• Knocking out 17 of those host genes conferred resistance to influenza A infection in mice.
• Two factors, Arhgef28 and Lasp1, were studied further and showed distinct protective mechanisms against the virus.
• The library is being made available to the broader research community as a shared platform for studying virus-host interactions in a living organism.

🌾 A single DNA letter change cut cadmium in rice grains — without hurting yield

• Base editing identified a single amino acid substitution (isoleucine to threonine at position 441) in a rice transporter gene called OsNramp5 that significantly reduced cadmium accumulation in both shoots and grains.
• The mutation didn't alter the gene's expression, protein levels, or its ability to transport manganese — but it did increase the transporter's selectivity for zinc, which may competitively block cadmium from moving into the plant.
• Field trials confirmed: grain yield and essential micronutrient levels were unaffected, while cadmium in grains was significantly reduced.

🧫 65 stem cell lines built to study Parkinson's disease genetics

• A collection of 65 genome-edited human pluripotent stem cell lines — called iSCORE-PD — was created, each carrying disease-causing or high-risk variants in 11 genes linked to Parkinson's disease (including SNCA, LRRK2, PINK1, and GBA1).
• Whole-genome sequencing showed that genetic differences between lines were minimal and largely confined to non-coding regions — much smaller than the variation typically seen between different patients' stem cells.
• Most genetic differences arose from random mutations during cell culture, not from off-target genome editing effects.
• The collection highlights prime editing as more precise than conventional CRISPR/Cas9 for building these kinds of controlled research tools, and is publicly available.

💉 Repeated LNP doses triggered T cell responses to Cas9 in mice — but not antibodies

• In C57BL/6 mice, both intramuscular (vaccination-style) and intravenous (therapy-style) delivery of lipid nanoparticles carrying Cas9 mRNA triggered detectable Cas9-specific T cell responses — measured by increased IFN-γ (an immune signaling protein) levels after restimulation.
• In the therapy-resembling setting (intravenous, liver-targeting), no Cas9-reactive antibodies were detected — suggesting the cellular and antibody arms of the immune system respond differently to LNP-delivered Cas9.
• Six Cas9-derived fragments recognized by CD8+ T cells (the immune cells that kill infected or foreign cells) were identified, along with one CD4+ T cell fragment that triggered strong IFN-γ production.

🧠 A protein called ZNF512B may suppress aging-related inflammation by prioritizing DNA repair

• A CRISPR-Cas9 screen targeting active regulatory regions of the genome identified ZNF512B (a zinc-finger protein) as a suppressor of the SASP — the senescence-associated secretory phenotype, which is the set of inflammatory signals that aging or stressed cells release.
• Loss of ZNF512B triggered DNA damage, activated the cGAS-STING inflammatory pathway, and caused widespread inflammatory gene expression changes.
• In human neuromuscular organoids (lab-grown tissue models), ZNF512B deficiency led to inflammation and cytokine secretion patterns resembling those seen in ALS (amyotrophic lateral sclerosis).
• In mice with acute liver injury, overexpressing ZNF512B reduced DNA damage and inflammation.