Confira os jogos de julho no PlayStation Plus e aproveite lançamentos incríveis para PS4 e PS5 para animar seu mês.
O post Jogos de julho no PlayStation Plus: grandes lançamentos e novidades quentes apareceu primeiro em Blog do Edivaldo - Informações e Notícias sobre Linux.
Manny Rutinel’s House campaign draws millions from big tech as pro- and anti-AI factions spar over regulation
Political groups funded by top tech executives have been homing in on one local race in Colorado, as the state’s Democratic primary vote gets under way on Tuesday. Democrat Manny Rutinel, who’s running in the competitive eighth congressional district for a seat in the House, has seen his campaign boosted with at least $2m in donations from committees led by the former Google CEO Eric Schmidt and crypto billionaire Chris Larsen.
Rutinel is a progressive candidate running against former state representative and centrist Democrat Shannon Bird. During his campaign, he has focused on his Latino heritage and centered his platform around affordability and regulating Immigrations and Customs Enforcement (ICE).
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© Photograph: Brice Tucker/The Greeley Tribune/AP
© Photograph: Brice Tucker/The Greeley Tribune/AP
© Photograph: Brice Tucker/The Greeley Tribune/AP
Handful of gas plants paid £4m to generate electricity at half- and full-time in World Cup game
A handful of Great Britain’s gas power plants were paid almost £4m to generate electricity for just a few hours on Tuesday evening as millions of sweltering viewers turned to air conditioning, electric fans and icy drinks during England’s second World Cup game.
The heatwave has caused electricity prices across Europe to surge this week amid higher demand for cooling and a string of power plant outages due to the record high temperatures.
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© Photograph: DeFodi Images/Shutterstock
© Photograph: DeFodi Images/Shutterstock
© Photograph: DeFodi Images/Shutterstock
There are some sights in this world that no photograph can truly capture.
Think of the rolling ribbons of the aurora in the northern and southern skies, the depth and breadth of the Grand Canyon, or the sense of immersion when diving on the Great Barrier Reef. Astronauts will tell you that not even large-format cameras can truly capture the blackness of outer space or the majesty that is our planet as seen from orbit or beyond.
It's not every day that a new one of those sights debuts. But such will be the case on Friday, November 13, when the California Science Center in Los Angeles finally reveals the launch-pad-like display of the space shuttle Endeavor inside the new Samuel Oschin Air and Space Center.
© California Science Center/Mike Kelley
Da Sony à Bose, da Apple à Sennheiser, selecionámos 11 modelos de auscultadores sem fios e 17 auriculares wireless em promoção durante os Amazon Prime Day. Poderá encontrar descontos até 58%.
The post Amazon Prime Day 2026: Conheça os 27 melhores auscultadores e auriculares em promoção appeared first on Tek Notícias.
Confira as principais novidades do Android 17, Motorola Edge 2026 e Nothing Phone. Atualizações, lançamentos e rumores para ficar de olho.
O post Android 17: Atualizações, hardware e novidades que você precisa saber agora apareceu primeiro em Blog do Edivaldo - Informações e Notícias sobre Linux.
De tablets a aspiradores, passando por auriculares e televisores OLED, a Amazon conta com centenas de milhares de promoções exclusivas para os membros Prime até ao dia 26 de junho. E, quem ainda não é membro, pode experimentar gratuitamente durante 30 dias.
The post Amazon Prime Day 2026: As melhores ofertas em tecnologia para aproveitar até quinta-feira appeared first on Tek Notícias.
In a groundbreaking study poised to reshape our understanding of mitochondrial genetics and neurological disorders, researchers have uncovered profound cortical neuronal disturbances driven by mitochondrial DNA (mtDNA) heteroplasmy in human brain organoids. This revelation centers on the common m.3243A>G mutation, a genetic defect frequently linked to a spectrum of neurodegenerative diseases. The work, published in Nature Communications in 2026 by Hathazi, Lyons, Lagos, and colleagues, offers unprecedented insights into how subtle shifts in mitochondrial DNA populations might disrupt cortical neuron function at a cellular and network level—potentially illuminating new therapeutic avenues for conditions that have long eluded effective treatment.
Mitochondria, often described as the cell’s powerhouses, maintain cellular energy homeostasis by generating adenosine triphosphate (ATP). However, mitochondrial DNA holds a unique genetic code separate from that of the nuclear genome, and it exists in multiple copies within each mitochondrion. Heteroplasmy—an admixture of normal (wild-type) and mutant mtDNA molecules—can fluctuate extensively between cells and tissues. This heterogeneity significantly affects mitochondrial function, but the precise pathological consequences in human neurons have remained elusive. The study by Hathazi and collaborators bridges this gap by meticulously linking mtDNA heteroplasmy directly to measurable disturbances within cortical neurons derived from human organoids.
The researchers employed human pluripotent stem cell-derived cerebral organoids, three-dimensional cellular models that recapitulate many aspects of human cortical development and cellular diversity. By engineering these organoids to harbor varying levels of the m.3243A>G point mutation in the mitochondrial tRNA^Leu(UUR) gene, they generated a physiologically relevant system that models how mtDNA heteroplasmy inherently affects neuronal populations. This mutation impairs mitochondrial protein translation, leading to compromised oxidative phosphorylation—a known driver of metabolic dysfunction in affected cells.
Single-cell analyses revealed marked mitochondrial dysfunction in neurons exhibiting high mutation loads. The mutant mitochondria produced increased reactive oxygen species (ROS), exhibited diminished membrane potential, and showed perturbed calcium handling. These biochemical aberrations culminated in altered electrophysiological properties, including disrupted synaptic transmission and impaired action potential firing patterns. The affected cortical neurons displayed reduced synaptic density and connectivity, phenotypes consistent with impaired network synchronization and cognitive deficits observed in mitochondrial encephalopathies.
Remarkably, the study delineates a threshold effect whereby neuronal function remains relatively preserved below a critical heteroplasmy level but deteriorates precipitously once mutant load surpasses this point. This finding is pivotal in explaining the clinical heterogeneity seen among patients with the m.3243A>G mutation, where symptom severity correlates with mtDNA mutant load. It also underscores the fine balance within mitochondria between normal and mutant genomes that regulates cellular health in the brain.
To establish causality, the investigators utilized gene-editing techniques to reduce the mutant mtDNA proportion within organoids. This intervention partially rescued mitochondrial respiration and restored electrophysiological parameters toward normal, confirming that the mutation-induced mitochondrial defects directly drive neuronal impairment. Pharmacological modulation of mitochondrial stress pathways, such as enhancing mitophagy and antioxidant defenses, further ameliorated neuronal dysfunction, highlighting potential therapeutic strategies.
The implications of these findings extend beyond the m.3243A>G mutation alone. Mitochondrial heteroplasmy is a pervasive phenomenon implicated in aging and numerous neurodegenerative diseases, including Parkinson’s and Alzheimer’s disease. This study suggests that subtle shifts in mitochondrial genetic composition may critically influence disease progression in ways previously unappreciated. Moreover, the use of human cerebral organoids enables modeling of human-specific neuronal vulnerabilities to mitochondrial perturbations, overcoming the limitations inherent in animal models that often lack analogous heteroplasmy dynamics.
The technological advancements leveraged in this research, including high-resolution single-cell mitochondrial assays and precise heteroplasmy editing, represent a tour de force in disease modeling. By recapitulating human cortical development and neuronal network formation in vitro, organoids provide a window into how mitochondrial mutations disrupt developmentally timed neuronal processes leading to widespread cortical dysfunction. These insights could fuel the design of novel mitochondrial-targeted therapies aiming to maintain heteroplasmy below pathological thresholds or to enhance mitochondrial quality control mechanisms.
Furthermore, the findings provoke reconsideration of diagnostic and prognostic approaches in mitochondrial disease. Current clinical assessments largely measure systemic heteroplasmy levels, which may not reflect the mosaicism present within specific brain regions. Non-invasive biomarkers that detect mitochondrial dysfunction in cortical neurons or imaging modalities sensitive to mitochondrial bioenergetics could aid in more accurate disease staging and treatment monitoring.
The study also opens intriguing questions regarding mitochondrial-nuclear genome interactions in the context of heteroplasmy. Given that mitochondrial function is coordinated with nuclear-encoded metabolic pathways, disturbed crosstalk in the presence of mutant mtDNA could exacerbate neuronal pathology. Future research may uncover compensatory nuclear genetic factors that modulate the impact of mtDNA mutations, potentially identifying new therapeutic targets.
In summary, Hathazi and colleagues provide a compelling narrative linking mitochondrial genetic heterogeneity to neuronal network disturbances using a cutting-edge human brain organoid model. This work underscores the critical importance of mtDNA heteroplasmy in shaping neuronal health and disease, particularly within the cerebral cortex, a region central to cognition and behavior. The insights gained promise to accelerate translational efforts aimed at mitigating mitochondrial dysfunction in neurological disorders, paving the way for therapies that restore mitochondrial harmony and preserve brain function.
By marrying sophisticated genetic engineering with organoid technology and comprehensive functional assays, this research sets a new benchmark in mitochondrial neuroscience. The concept that distinct levels of a common mtDNA mutation can finely tune neuronal fate and function introduces a paradigm shift with far-reaching implications. As the field progresses, these findings may herald a future where mitochondrial genomic interventions become integral components of personalized neurotherapeutics, ultimately improving the lives of patients affected by devastating mitochondrial diseases.
Subject of Research:
Mitochondrial DNA heteroplasmy and its impact on cortical neuronal function in human brain organoids bearing the m.3243A>G mutation.
Article Title:
Mitochondrial DNA heteroplasmy drives cortical neuronal disturbances in human organoids harbouring the common m.3243A>G mutation.
Article References:
Hathazi, D., Lyons, C., Lagos, D. et al. Mitochondrial DNA heteroplasmy drives cortical neuronal disturbances in human organoids harbouring the common m.3243A>G mutation. Nat Commun (2026). https://doi.org/10.1038/s41467-026-74103-y
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A 20.ª edição da conferência internacional DEBS, sobre sistemas distribuídos e processamento de dados em tempo real realiza-se de 23 a 26 de junho na Faculdade de Ciências da Universidade de Lisboa.
The post DEBS 2026: Conferência reúne os cientistas por detrás da infraestrutura invisível que sustenta a IA em Lisboa appeared first on Tek Notícias.
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