A groundbreaking study from Mass General Brigham Neuroscience Institute has uncovered crucial genetic underpinnings of congenital cerebral ventriculomegaly (CCV), a disorder characterized by the abnormal swelling of fluid-filled brain ventricles in fetuses. Frequently observed alongside autism spectrum disorder and other neurodevelopmental conditions, CCV has long been a clinical challenge due to its complex origins and unpredictable outcomes.

By analyzing genetic data from approximately 2,700 children diagnosed with CCV and their parents, researchers identified rare, deleterious mutations affecting genes integral to early brain development. These genes regulate the growth and organization of neural cells critical to forming the cerebral cortex—the brain’s center for cognition, memory, and language. Notably, mouse models in which these genes were silenced exhibited enlarged ventricles, linking genetic abnormalities directly to functional and structural brain defects.

This pioneering work shifts the medical understanding of CCV from purely a cerebrospinal fluid circulation disorder to one deeply rooted in developmental brain pathology. It suggests that the ventricular system’s dysfunction reflects a broader impairment in neural circuit formation and brain architecture, potentially explaining why many infants with CCV experience developmental delays and an increased risk of autism.

The implications of these findings are profound. Prenatal neuroimaging combined with targeted genetic screening could enable earlier diagnosis of at-risk fetuses, opening the door to timely interventions before the onset of symptoms. Current neurosurgical treatments, while often lifesaving, do not consistently improve neurological outcomes and expose patients to risks such as infections and lifelong shunt dependency.

Kristopher T. Kahle, MD, PhD, Chief of Pediatric Neurosurgery at Mass General Brigham and senior author of the study, emphasizes the potential of genomic testing to revolutionize patient care. He anticipates that genetic profiling could refine clinical decisions, distinguishing patients who would benefit from surgery from those better served by alternative therapies.

The study’s integration of human genetic analysis with animal modeling represents a paradigm shift, enhancing our grasp of how genetic mutations disrupt cerebrospinal fluid dynamics and cerebral cortex development simultaneously. This dual perspective is poised to stimulate further research aimed at therapeutic innovations targeting the molecular roots of CCV.

Ultimately, this research underscores a critical nexus between developmental neurogenetics and pediatric neurosurgery, offering hope for improved diagnostic precision and personalized treatment strategies. With continued advancements, clinicians may one day prevent or mitigate the neurodevelopmental disabilities often associated with ventriculomegaly, improving quality of life for countless affected children.

Subject of Research: Human tissue samples
Article Title: Developmental genetic determinants of the human cerebrospinal fluid-ventricular system
News Publication Date: —
Web References: https://doi.org/10.1126/scitranslmed.aec4386
References: Allington G et al. Science Translational Medicine. DOI: 10.1126/scitranslmed.aec4386
Keywords: Hydrocephalus, Congenital cerebral ventriculomegaly, Neurodevelopmental disorders, Autism spectrum disorder, Pediatric neurosurgery, Genomic testing

A groundbreaking imaging technology developed by researchers at the University of Oklahoma promises to revolutionize liver transplant evaluations by enabling more comprehensive and rapid assessments of donor organ health. With thousands of patients awaiting liver transplants nationwide, transplant teams urgently need tools that can deliver swift, accurate insights without invasive procedures. The team, led by Dr. Qinggong Tang, has adapted polarization-sensitive optical coherence tomography (PS-OCT)—an advanced imaging modality originally utilized in retinal scans—to noninvasively evaluate donor livers at high resolution.

Traditional liver assessments rely heavily on biopsies, where small tissue samples are extracted and examined for signs of disease or damage. While considered the gold standard, biopsies are inherently limited, providing only a microscopic snapshot of a vast organ that may vary in condition. This narrow sampling can cause uncertainty, sometimes leading to the discard of viable organs. The OU team sought to overcome these limitations by employing PS-OCT, which not only captures detailed cross-sectional images of liver tissue but also measures its polarization properties, revealing subtle structural and biochemical features linked to liver health.

The engineers designed a portable PS-OCT system optimized for clinical and operating room environments, allowing transplant teams to scan liver surfaces quickly and noninvasively. The imaging data are then analyzed using advanced artificial intelligence algorithms, co-developed with Dr. Chongle Pan’s computer science lab. These AI tools quantify critical parameters indicative of hepatic steatosis (fat accumulation) and inflammation, two primary factors influencing liver viability. By training their models on datasets from over thirty clinical cases—comparing PS-OCT results with biopsy outcomes and post-transplant organ function—the researchers demonstrated strong correlations between imaging biomarkers and actual clinical metrics.

Beyond providing a more holistic view of donor liver condition, PS-OCT could enhance decision-making speed, potentially expanding the pool of organs deemed suitable for transplantation by identifying healthy tissue regions missed by biopsy. Such improvements may reduce organ discard rates and improve transplant success. Encouraged by initial findings, the OU team plans a large multisite clinical trial involving institutions like UT Southwestern and the Cleveland Clinic to validate and refine this approach across diverse patient populations.

This work exemplifies OU’s interdisciplinary innovation platform that integrates optical bioimaging, machine learning, pathology, and organ perfusion technology to translate engineering advances directly into clinical practice. The researchers also intend to extend PS-OCT evaluation methods to other organs, including kidneys and lungs, widening the impact of this technology.

Supported by National Science Foundation grants and institutional partnerships, the team’s efforts mark a significant step toward redefining how transplanted organs are assessed. Dr. Tang emphasizes that this is just the beginning, envisioning a future where noninvasive, AI-enhanced imaging facilitates safer, faster, and more effective organ transplantation worldwide.

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Subject of Research: Donor liver evaluation using advanced imaging techniques
Article Title: Human donor liver viability evaluation with polarization-sensitive optical coherence tomography
News Publication Date: 24-Jun-2026
Web References: http://dx.doi.org/10.1126/scitranslmed.adv7124
Image Credits: University of Oklahoma / Ellie Pinter

Keywords

Organ transplantation, Optical coherence tomography, Polarization-sensitive imaging, Liver viability, Artificial intelligence, Biomedical imaging, Noninvasive diagnostics, Medical innovation

A groundbreaking study unveils how the ARP2/3 complex orchestrates the dynamic behavior of neurites, providing fresh insights into neuronal growth and polarity. Researchers utilized advanced optogenetic tools to manipulate RAC1, an upstream regulator of ARP2/3, revealing spatially distinct roles of actin assembly in neuronal morphology.

By employing photoactivatable RAC1 (PA-RAC1), the team demonstrated that ARP2/3-mediated actin assembly at neurite tips promotes growth cone activation and neurite extension. Local activation of PA-RAC1 triggered robust growth cone dynamics, driving neurite elongation. Conversely, activation of a dominant-negative RAC1 mutant led to collapse of the growth cone and neurite retraction, underscoring ARP2/3’s role in sustaining neurite advancement.

Intriguingly, PA-RAC1 activation at the soma induced lamellipodia formation reminiscent of nascent actin waves, which were associated with neurite retraction events. This phenomenon mirrored intrinsic cellular behaviors where somatic actin waves correspond with retracting neurites. The study elegantly showed that the emergence of these waves reduced somatic actin patch intensity, indicating a tightly regulated cytoskeletal oscillator mechanism.

The authors further explored the effects of ARP2/3 inhibition using CK-666 perfusion at distinct cellular locales. When applied over the soma and proximal neurites, CK-666 induced neurite retraction, whereas neurites outside this region continued growing unabated. Notably, actin waves were initiated in neurites outside the inhibited zone, propagating retrogradely toward the soma but dissipating upon entering CK-666-exposed areas. This highlights a spatial dependence of ARP2/3 activity for wave initiation and propagation.

Remarkably, simultaneous activation of PA-RAC1 at multiple growth cones revealed competitive dynamics in actin assembly, with enhanced growth cone activity limited to one or two sites. This suggests an intrinsic cellular mechanism balancing cytoskeletal resources and neurite growth across the complex neuronal arborization.

Together, these findings articulate a dual role for ARP2/3: driving actin wave initiation at the soma that triggers neurite retraction, and supporting growth cone expansion at neurite tips to promote extension. This oscillatory interplay mediated by ARP2/3 and RAC1 underscores the cytoskeleton’s fundamental role in establishing neuronal polarity.

This study not only provides a mechanistic framework for how neurons spatially regulate growth and retraction but also suggests that intrinsic cytoskeletal oscillators underpin the dynamic remodeling necessary for proper neuronal circuit formation. These insights pave the way for future investigations into cytoskeletal dysregulation in neurodevelopmental disorders and neuronal regeneration strategies.

The precise spatial control of actin dynamics mediated by ARP2/3 complex activity advances our understanding of neuronal development, highlighting how local cytoskeletal modulators can dictate overall neuronal architecture through oscillatory growth behaviors.

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Subject of Research: Neuronal cytoskeletal dynamics and polarity establishment

Article Title: An intrinsic cytoskeletal oscillator establishes neuronal polarity

Article References:
Lin, Tc., Coles, C.H., Alfadil, E. et al. An intrinsic cytoskeletal oscillator establishes neuronal polarity. Nature (2026). https://doi.org/10.1038/s41586-026-10755-6

Image Credits: AI Generated

DOI: https://doi.org/10.1038/s41586-026-10755-6

As the newly elected president, Abelardo de la Espriella, pledges to exploit oil reserves, environmentalists prepare to defend climate progress

It is hard for Yuvelis Morales Blanco to pinpoint when her activism started. Now 25, she recalls getting involved in land rights and environmental issues in Santander, northern Colombia, from a young age. Living near water, she says, has always shaped her connection to nature. “My parents are fishers on the Magdalena, Colombia’s most important river,” says Morales. “For us, the river isn’t just food – it embodies life, identity and culture.”

In April, she received the Goldman environmental prize for her leadership in Puerto Wilches, where she succeeded in halting oil extraction and fracking. Yet, it seems her struggle is only just beginning.

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© Photograph: Iván Valencia/AP

© Photograph: Iván Valencia/AP

© Photograph: Iván Valencia/AP

Villagers in Awoye in the Niger Delta say the ongoing pollution is causing sickness and environmental destruction, while pleas for help go unanswered

Perched on a narrow hospital cot across from her son, Bodunwa Orugbemi can hear the distant Atlantic Ocean and smell the stench of crude oil on the air drifting in from the shore. For days, her 21-year-old son has been lying in this hospital in the Niger Delta, swallowing small spoonfuls of food without being able to speak.

Seventy‑year‑old Orugbemi says Ijadopin started coughing one evening in May, inside their small wooden home in Awoye on Nigeria’s Atlantic coastline. After a few days his cough intensified, then he developed a skin irritation, followed by difficulty breathing.

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© Photograph: NurPhoto/Getty Images

© Photograph: NurPhoto/Getty Images

© Photograph: NurPhoto/Getty Images

Price cuts and low-interest-rate loans are luring buyers, including people offended by the company’s chief executive.

© Michael Nguyen/NurPhoto, via Associated Press