A modified version of CRISPR-Cas9 has enabled, for the first time, the efficient integration of a large transgene capable of inactivating entire chromosomes into one of the three copies of chromosome 21 in Down syndrome-derived cells. The goal is to silence the extra copy to limit the gene-dosage imbalance that drives many features of trisomy 21. Researchers at Beth Israel Deaconess Medical Center turned to XIST, the long noncoding RNA responsible for the natural silencing of the X chromosome in females. Using this strategy, they achieved integration efficiencies of 20% to 40% and a partial reduction in the overexpression of chromosome 21 genes.
Researchers from Harvard Medical School and Spark Therapeutics Inc. tested subretinal NRF2 gene therapy in dry AMD models to investigate whether it could relieve oxidative stress and inflammation.
While Alzheimer’s disease is known for involving amyloid-b plaques and neurofibrillary tangles, it also involves metabolic dysfunction, further research into which could help scientists understand how the disease occurs and how it can be treated.
Secondary lymphedema is a chronic condition that often affects the upper or lower extremities and is characterized by progressive retention of lymphatic fluid at affected sites. At the affected sites, this progressive fluid retention often leads to pain, decreased function and wounds. The condition is commonly associated with cancer surgery that requires the removal of draining lymph nodes.
Two back-to-back papers published in Nature on Sept. 10, 2025, shed new light on the unexpected role of neurons in shaping the evolution of small-cell lung cancer (SCLC). It’s already known that, in gliomas, cerebral cancer cells actively damage axons, contributing to tumor progression through direct neural disruption.
Two back-to-back papers published in Nature on Sept. 10, 2025, shed new light on the unexpected role of neurons in shaping the evolution of small-cell lung cancer (SCLC). It’s already known that, in gliomas, cerebral cancer cells actively damage axons, contributing to tumor progression through direct neural disruption. Comparable nerve-tumor interactions have been reported in peripheral cancers, where tumor-induced nerve disruption promotes inflammation and an immunosuppressive microenvironment linked to immunotherapy resistance.
The difference between the origin of Alzheimer's disease (AD) and its symptoms is an obstacle to finding effective treatments. Scientists focused on amyloid-β (Aβ) plaques and tau aggregates to slow neurodegeneration and cognitive decline. Without identifying what causes AD, approved treatments do not provide much benefit.
The difference between the origin of Alzheimer's disease (AD) and its symptoms is an obstacle to finding effective treatments. Scientists focused on amyloid-β (Aβ) plaques and tau aggregates to slow neurodegeneration and cognitive decline. Without identifying what causes AD, approved treatments do not provide much benefit. However, new findings suggest that restoring lithium levels in the brain could prevent and treat AD. Not just any lithium would work, just the forms that do not bind to Aβ.
Research of the neuroimmune mechanisms involved in stress-related fear revealed how astrocytes interact with neurons in the amygdala. The study, led by Harvard scientists, also unveiled that this interaction recruited monocytes to the meninges during chronic stress and showed how psychedelic compounds reversed monocyte accumulation in the meninges and reduced fear behavior.
Neurodegenerative pathologies, once primarily associated with protein alterations, should be revisited in the context of lipidopathies, researchers argued at the 2025 International Conference of Alzheimer’s & Parkinson’s Disease and Related Neurological Disorders (AD/PD 2025).
