The neurons in question produce acetylcholine, a chemical messenger that is critical for a range of functions including sleep, cognition and movement. Their gradual loss is linked to some of Parkinson’s most disabling and treatment-resistant symptoms: problems with gait and balance, disturbed sleep, cognitive decline and, in some people, psychosis. While much of the public and scientific attention on Parkinson’s has centred on dopamine-producing neurons in the midbrain, which underlie the condition’s characteristic tremor, rigidity and slowness of movement, this study shifts focus to a brainstem population whose decline shapes the broader, often harder-to-treat burden of the illness.

To interrogate these cells, the team used advanced single-cell mitochondrial DNA sequencing combined with computational analysis, examining individual neurons from brain tissue generously donated by people who had lived with Parkinson’s disease, alongside tissue from healthy controls. Rather than averaging signals across thousands of cells, the single-cell approach allowed the researchers to read out the mitochondrial genome of each neuron separately, revealing the extent and pattern of damage cell by cell. Dr Ilse Pienaar of the University of Birmingham, a senior author of the study, noted that this is the first time single-cell mitochondrial genetic sequencing has been applied to these specific brainstem neurons in people with Parkinson’s disease, and that studying individual neurons has allowed the team to see, in unprecedented detail, the mitochondrial changes associated with their vulnerability.

What the sequencing revealed was striking. The affected neurons carried extensive large-scale deletions in their mitochondrial DNA, and these deletions were particularly concentrated within a stretch of the mitochondrial genome known as the major arc. This region is densely populated with genes that are essential for producing energy in cells, so removing chunks of it strikes directly at the machinery that keeps a neuron powered. Mitochondria are often described as the powerhouses of the cell, and damage to their DNA can interfere with their ability to generate the energy that neurons need, potentially leaving these cells less able to cope with the relentless electrical and metabolic demands placed on them across a human lifetime.

The biological logic of this vulnerability is compelling. Neurons are among the most energy-hungry cells in the body, and brainstem cholinergic neurons must sustain long projections and continuous signalling to regulate sleep-wake cycles, attention and motor control. If their mitochondrial genomes accumulate deletions in the very region that encodes core components of the energy-production system, the resulting power deficit could compound over time, gradually eroding the cell’s capacity to survive. The new findings therefore provide a mechanistic account of why these acetylcholine-producing neurons may be particularly susceptible to degeneration in Parkinson’s disease, complementing decades of work on dopaminergic cell loss.

Yet the study is not simply a catalogue of damage. Despite the extensive mitochondrial DNA lesions, the researchers found evidence that the neurons may be mounting an active protective response. The affected cells showed increased levels of PINK1, a gene central to mitochondrial quality control. PINK1 helps cells identify mitochondria that have become damaged and target them for removal, a process that clears dysfunctional power units from the network and helps maintain a population of healthy mitochondria capable of sustaining energy production. In other words, even as the mitochondrial genomes of these neurons crumbled, the cells appeared to be ramping up the molecular machinery that weeds out the worst-affected organelles.

Perhaps the most intriguing observation concerns individual variation. Higher levels of PINK1 were particularly evident in neurons from people who had survived longer after their Parkinson’s diagnosis. This pattern raises the possibility that a stronger mitochondrial quality-control response helps some neurons withstand damage for longer, effectively buying time and preserving function in the face of accumulating genetic injury. If confirmed, the finding would suggest that the trajectory of Parkinson’s disease is shaped not only by the forces that damage neurons but also by the variable vigour of the brain’s own defences against that damage.

Dr Joanna Elson of Newcastle University, a senior author of the study, described the results as revealing an extraordinary resilience within these vulnerable neurons. Although the team observed extensive mitochondrial DNA damage, the cells appear to mount a protective response through increased PINK1 expression, likely as an attempt to maintain healthy mitochondria and preserve energy production. She added that understanding why this response appears to be more effective in some individuals than others could open new avenues for therapies aimed at supporting the brain’s own protective mechanisms. Dr Pienaar similarly emphasised that the findings point towards biological pathways that could potentially be harnessed therapeutically, and that strengthening the mechanisms which maintain mitochondrial health could ultimately help slow disease progression and improve quality of life for people living with Parkinson’s.

The therapeutic implications are considerable. PINK1 has long been known to the Parkinson’s field because mutations in the gene cause early-onset, inherited forms of the disease, placing it at the heart of the cellular pathway that surveys mitochondrial health and dispatches damaged organelles. The new data suggest that this same pathway is active in the vulnerable brainstem neurons of people with sporadic Parkinson’s, and that its activity correlates with survival after diagnosis. That correlation makes mitochondrial quality control an attractive target for drug development: if researchers can identify why the response is more effective in some patients and find ways to amplify it in others, treatments might be developed that enhance the brain’s natural protective mechanisms rather than simply replacing lost neurotransmitters.

The researchers hope the findings will catalyse further studies of mitochondrial quality-control pathways as potential therapeutic targets in Parkinson’s disease, and that understanding how some neurons withstand damage could ultimately inform treatments that bolster these defences across the brain. For a condition that affects millions worldwide and for which current therapies address symptoms rather than halt progression, the demonstration that single-cell sequencing can expose both the vulnerabilities and the resilience of individual human neurons marks a methodological and conceptual advance. It reframes Parkinson’s disease, in part, as a struggle between mitochondrial damage and cellular self-repair, one in which the outcome may depend on how well each neuron can keep its power supply intact.

Subject of Research: Single-cell mitochondrial DNA sequencing of vulnerable brainstem cholinergic neurons in Parkinson's disease

Article Title: First study to sequence mitochondrial DNA from individual vulnerable brainstem neurons in Parkinson’s disease

Article References: First study to sequence mitochondrial DNA from individual vulnerable brainstem neurons in Parkinson’s disease. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: Parkinson's disease, mitochondrial DNA, single-cell sequencing, brainstem neurons, PINK1, cholinergic neurons, mitochondrial quality control, neurodegeneration, major arc deletions, Brain journal, University of Birmingham, Newcastle University

Metal-organic frameworks, commonly abbreviated as MOFs, are built from metal atoms or clusters connected by organic molecules into highly ordered, repeating lattices. The geometry of these connections produces structures riddled with pores measured in fractions of a nanometre, giving MOFs an enormous internal surface area relative to their mass. That porosity is the key structural feature that creates the internal space necessary for MOFs to interact with target molecules, which is why the materials are under intense investigation for applications ranging from gas storage and separation to sensing, catalysis, bio-imaging, and magnetic materials. Because both the metal nodes and the organic linkers can be varied, MOFs have long been regarded as among the most customisable classes of solid materials in modern chemistry.

The new material, designated UoB-116, belongs to a subset of the MOF family built around rare-earth metals. In the first stage of the study, the researchers created and structurally characterised fifteen individual versions of the framework, each incorporating a different rare-earth metal. This step established that the underlying structure was robust enough to accommodate a wide range of metal ions without collapsing or losing its crystalline order. The team then moved to progressively more complex compositions, combining two, four, twelve, and finally fifteen different metals within the same framework, demonstrating at each stage that the crystal retained its ordered architecture.

The final and most striking step was the addition of indium, a metal drawn from outside the rare-earth family. The resulting MOF contained sixteen different metals simultaneously: yttrium, indium, and fourteen of the lanthanides. According to the researchers, UoB-116 is the first reported MOF to combine metals drawn from three different regions of the periodic table — the d-block, the p-block, and the f-block — within a single framework. That breadth of chemical compatibility is what gives the material its mix-and-match character, allowing elements with very different electronic structures to sit side by side in one ordered lattice.

To show that this compositional freedom translates into functional control, the team focused on two of the sixteen metals, dysprosium and lanthanum, and systematically varied the balance between them. The results were unambiguous. Increasing the dysprosium content increased the material’s magnetic response, while the characteristic near-infrared light absorption associated with dysprosium could be adjusted simply by altering its concentration. Porosity responded in the opposite direction: adding more lanthanum progressively reduced the material’s measured surface area. Most dramatically, the amount of carbon dioxide the material could take up under the conditions tested fell from 5.72 millimoles per gram for the all-dysprosium version to 1.23 millimoles per gram for the all-lanthanum version — a demonstration that gas-storage behaviour can be changed by adjusting the metals alone, with no change to the framework’s underlying architecture.

Corresponding author Professor Neil Champness of the University of Birmingham framed the advance as a step toward materials that behave almost like software. “Our findings confirm a route towards ‘programmable’ porous materials, where scientists could choose a combination of metals to dial magnetic, optical, chemical, or gas-adsorption behaviour,” he said. “The ability to predict how strongly particular metals will be incorporated potentially offers much finer control over future multi-metal materials. Rather than having to invent a completely new material every time they want different properties, researchers can potentially change the metallic ‘recipe’ within the same underlying structure.”

That question of predictability is central to why the work matters beyond its record-setting composition. In many multicomponent materials, different metal ions compete for the same structural sites in ways that are difficult to anticipate, and the final distribution of metals can be chaotic. The Birmingham-led team reports that the incorporation of particular metals into UoB-116 follows a bias linked to the radius of the cations, meaning that how strongly each metal is taken up into the framework can be predicted from its ionic size. If that predictive relationship holds across other metal combinations, it would give chemists a design rule for dialling in specific property profiles rather than discovering them by trial and error.

The practical stakes are considerable, because MOFs already serve as custom molecular sponges across several major industries. In clean energy, they are studied for compact hydrogen storage in fuel-cell vehicles and for selective carbon capture from industrial emissions. In environmental safety, related frameworks are being explored for harvesting drinkable water from arid air and for the safe storage of toxic gases used in semiconductor manufacturing. In industrial chemistry, energy-saving adsorptive separations based on MOFs could replace cryogenic distillation, one of the most energy-intensive unit operations in the chemical industry. In biomedicine, high-capacity frameworks are being developed for targeted drug delivery and as imaging contrast agents. A single tunable platform that can be re-optimised for each of these tasks by swapping metals could dramatically shorten development cycles.

The study, titled “Rare-Earth Multivariate Metal–Organic Frameworks: Cationic Radius Biased Compositional Control and Property Tuning,” was led by Adnan Ishaq and Professor Neil R. Champness at Birmingham, with contributions from Joseph O. Ogar, Asif Raza, Danielle E. Schier, Stephen P. Argent, Musa M. Mahmud, Lucy Clark, Jacob L. Brownlee, and Soumya Mukherjee across the collaborating institutions. The work appeared in Angewandte Chemie on 26 September 2026, and its publication marks one of the most extensive demonstrations yet of compositional control in a multivariate framework.

For the broader field of materials chemistry, UoB-116 offers a proof of concept that the boundary between designing new materials and tuning existing ones can be blurred. If the same principle — a robust framework that tolerates many metals in predictable proportions — can be extended to other linker chemistries and other metal families, the result could be a generation of porous materials whose properties are specified on demand: more magnetic here, more porous there, tuned for carbon capture or near-infrared optics by nothing more than a change in the recipe. For now, the sixteen-metal framework stands as evidence that the periodic table itself can be treated as a palette, and that the next breakthrough material may not need to be built from scratch at all.

Subject of Research: Multivariate rare-earth metal-organic frameworks with tunable properties through compositional control of incorporated metals

Article Title: ‘Mix-and-match’ material’s properties can be tuned by changing its metallic ‘recipe’

Article References: ‘Mix-and-match’ material’s properties can be tuned by changing its metallic ‘recipe’. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: metal-organic frameworks, MOFs, rare-earth metals, lanthanides, porous materials, gas storage, carbon capture, magnetism, light absorption, materials chemistry, University of Birmingham, Angewandte Chemie

The study, conducted by the NIHR-funded Global Health Group on Equitable Access to Quality Health Care for Injured People in Four Low- or Middle-Income Countries, known as Equi-injury, followed 8,858 injury patients treated at nineteen hospitals across Ghana, Pakistan, Rwanda and South Africa. The hospitals included both urban and rural facilities, giving the researchers an unusually broad picture of how injured people move through very different healthcare environments. It is the first large multi-country study to examine both mortality and disability outcomes among hospitalised injury patients across low- and middle-income settings, and its scale allows conclusions that smaller, single-country studies could not support.

The headline numbers are stark. Within three months of hospital discharge, 47.6 per cent of patients had either died or were living with moderate-to-severe disability. Six point one per cent died while still in hospital, 9.7 per cent had died by the three-month mark, and 40.6 per cent were surviving with moderate-to-severe disability. Behind those figures lies a patient population that mirrors the global pattern of injury: the median age was just 31 years, 76.8 per cent were male, road traffic collisions accounted for half of all injuries recorded, and orthopaedic injuries were the most common type, affecting 39.2 per cent of patients. These are overwhelmingly young people in the prime of working life, which means the economic and social ripple effects of death and disability extend far beyond the individuals themselves.

Perhaps the most provocative finding concerns ambulances. Patients who arrived at hospital by ambulance had significantly worse outcomes than those who arrived by other means, with 86 per cent higher odds of death or disability and more than double the odds of mortality within three months. The researchers are careful to stress what this does and does not mean. Lead author Professor Justine Davies, of the University of Birmingham, said that one of the most surprising findings was that measures often assumed to improve outcomes, such as ambulance transport and rapid transfer to major hospitals resembling highly centralised trauma services, were not consistently linked with better recovery or survival. She emphasised that this does not mean ambulances cause worse outcomes, but rather suggests that investment in ambulance systems alone is unlikely to improve outcomes unless services are coordinated and appropriately resourced.

Corresponding author Dr Leila Ghalichi, also of the University of Birmingham, reinforced the point. She said the finding does not mean ambulances or specialist trauma centres are ineffective; rather, it suggests that simply investing in expensive emergency systems is not enough. In her view, low- and middle-income countries should be cautious about investing heavily in ambulance services and specialist, centralised trauma centres without ensuring they are well coordinated, properly staffed, and supported by strong health systems. Better data and further research, she argued, are needed to understand which trauma-care investments actually improve patient outcomes. The message is a direct challenge to the assumption that healthcare models developed in wealthier countries can simply be transplanted elsewhere and expected to work.

One of the study’s most counterintuitive results concerns time. The researchers found no evidence that reaching a hospital more quickly reduced the risk of death, and patients who experienced some delays were actually less likely to be disabled later. This runs against the deeply entrenched belief, reinforced by trauma systems in high-income countries, that faster treatment always leads to better outcomes after injury. The study also found that stopping first at a nearby hospital for emergency stabilisation may sometimes be beneficial, particularly when a specialist hospital is far away, while going directly to a major trauma hospital may improve outcomes when such a hospital is close by. In other words, the optimal route to definitive care depends heavily on geography and local capacity, not on a universal formula.

The pattern of who recovers and who does not also shifted depending on where patients were in the healthcare journey. Age was linked to worse outcomes, but gender, wealth and education had little effect on survival while patients were in hospital. Once patients left hospital, however, the picture changed: wealthier and better-educated patients tended to recover better, suggesting that access to rehabilitation and follow-up care plays an important role in long-term recovery. This split between in-hospital and post-discharge outcomes points to a neglected phase of trauma care. A health system may perform adequately in the operating theatre yet fail its patients in the weeks and months afterward, when disability is either mitigated through rehabilitation or allowed to harden into permanent impairment.

Country-level differences were striking and underline the study’s central argument that context matters. Patients in South Africa had the lowest odds of disability but the highest odds of mortality, while patients in Rwanda experienced the lowest odds of mortality. Patients in Pakistan, meanwhile, experienced substantially higher odds of the combined outcome of death or disability than those in Ghana. These divergent profiles suggest that different health systems fail in different ways: one country may keep people alive but leave them disabled, another may achieve better survival overall. No single imported template can address such varied failure modes, which is why the study argues that countries should develop trauma and injury-care systems based on local evidence, local resources, and the actual needs of their patients.

The broader context makes the findings urgent. Injuries are estimated to account for around ten per cent of the global burden of disease, yet trauma care receives far less attention than infectious diseases or chronic conditions in global health policy. As road traffic volumes grow across Africa and South Asia, the burden of injury is likely to rise, and the population studied here, young, predominantly male, and injured largely on the roads, represents the face of that coming wave. The Equi-injury study provides something the field has lacked: rigorous, multi-country evidence about which parts of the care pathway actually determine whether injured people survive and recover. Its conclusion is uncomfortable but constructive. Money spent on ambulances and trauma centres without coordination, staffing, and strong underlying health systems may buy impressive infrastructure without saving lives. The path forward, the researchers argue, lies in understanding how people actually move through their local healthcare systems, and in building trauma care around that reality rather than around imported blueprints.

Subject of Research: Mortality and disability outcomes among hospitalised injury patients in low- and middle-income countries

Article Title: Global injury crisis highlights urgent need for smarter trauma care

Article References: Global injury crisis highlights urgent need for smarter trauma care. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: trauma care, injury, global health, low- and middle-income countries, ambulances, disability, mortality, The Lancet Global Health, University of Birmingham, health systems, road traffic collisions, rehabilitation

The work was carried out with partners at the UK Atomic Energy Authority, TU Bergakademie Freiberg in Germany, and City University of Hong Kong, and is described in papers published in Nature Communications Materials and Scripta Materialia. Project leader Sandy Knowles, Professor in Nuclear Materials at the University of Birmingham, said the discovery challenges the conventional understanding that grain refinement typically requires extensive thermomechanical processing. According to Knowles, the PIX mechanism can be used to refine grain structure in varied materials systems, allowing engineers to design alloys in which strain is generated internally during heat treatment. That, he noted, opens possibilities for materials that are difficult to process by conventional means, including refractory metals such as tungsten and advanced aerospace alloys, particularly for net-shape manufacturing.

To appreciate why the finding matters, it helps to consider what grain structure actually does for a metal. Most engineering alloys are polycrystalline, meaning they are built from countless tiny crystalline domains called grains, each with its own orientation of the atomic lattice. The boundaries between these grains act as obstacles to dislocations, the line defects that carry plastic deformation, so finer grains generally mean greater strength, a relationship formalised in the Hall-Petch relationship. Grain size also governs fracture behaviour. Large grains offer easier pathways for cracks to propagate, while small grains create more barriers that can improve mechanical reliability and resistance to damage. Controlling grain size is therefore one of the central levers of materials design, and until now the standard way to pull that lever was deformation followed by recrystallisation annealing.

Conventional thermomechanical processing works by storing energy in the metal through mechanical deformation. When the deformed material is subsequently heated, that stored energy drives recrystallisation, in which new, strain-free grains nucleate and grow, replacing the deformed structure with a finer one. The Birmingham-led team found that a similar outcome can be achieved without any deformation at all. In both alloy systems they studied, tiny regions with different atomic structures form during heat treatment, and these regions are symmetrically related to one another. As ageing proceeds, a mismatch evolves between these regions, and the resulting internal strain becomes strong enough to create new, smaller grains within the metal. The driving force for recrystallisation is generated chemically, inside the material itself, rather than mechanically, by external working.

The first demonstration system was a tungsten-chromium alloy aimed at fusion energy. Tungsten is regarded as a leading candidate material for the plasma-facing components of future fusion reactors because of its exceptional heat resistance and its very high melting point of 3,422 degrees Celsius, the highest of any metal. Yet tungsten has a well-known weakness: it is inherently brittle, and exposure to neutron radiation can worsen that brittleness, a problem that compounds the already punishing conditions inside a fusion device. Improving the grain structure of tungsten-based alloys is one route to mitigating these issues, but tungsten’s refractory nature makes conventional deformation processing extremely difficult. In the study, ageing the tungsten-chromium alloy at 1,250 degrees Celsius generated enough internal stress to drive recrystallisation, reducing the average grain size by around 60 percent, all without the alloy ever having been rolled or forged.

The second demonstration extended the principle to a very different class of material: a titanium-iron-molybdenum alloy described as a bcc-superalloy, a family of body-centred-cubic alloys being explored for high-performance aerospace applications such as jet-engine compressor blades. Here the effect was even more dramatic. Ageing the alloy at 750 degrees Celsius caused its average grain size to fall by around 90 percent, while hardness increased by 60 HV. The combination of substantial grain refinement and a simultaneous hardness gain from a simple thermal treatment is what makes the result striking from an engineering standpoint, since hardness and fine grain size are both desirable in rotating aero-engine hardware that must withstand high stresses and temperatures.

The underlying physics in both cases involves precipitates and lattice misfit. During ageing, second-phase regions precipitate within the parent crystal structure, and because these regions adopt atomic arrangements that are symmetrically related to the matrix, a coherency mismatch builds up between them as they evolve. That mismatch generates elastic strain fields, and when the accumulated internal stresses become large enough, they can nucleate new grains in the undeformed material, in effect hijacking the recrystallisation process for a purpose it was never designed to serve. The researchers describe PIX as a broader materials-design principle rather than a quirk of one composition, meaning it could in principle be engineered into many different alloy systems by choosing chemistries and heat treatments that produce the right misfit-driven internal strain.

The practical implications extend well beyond the two demonstration alloys. PIX could be particularly useful for materials that are brittle, difficult to shape, or produced using additive manufacturing techniques, where traditional rolling and deformation processes may not be practical. Printed metal parts, for example, often cannot be passed through a rolling mill, and brittle refractory metals resist forging altogether. A heat treatment that refines grain structure without prior deformation offers such materials a processing route they otherwise lack. For fusion engineering, where large tungsten components must survive intense heat fluxes and neutron bombardment, a thermally activated self-refinement step could improve damage tolerance without adding mechanical processing stages. For aerospace, the titanium-iron-molybdenum result points toward heat-treatable bcc-superalloys whose properties can be tuned for demanding rotating parts.

Knowles and colleagues frame the discovery as an invitation to rethink how grain structure is engineered. Instead of designing alloys around the machinery needed to deform them, metallurgists can now consider building the driving force for refinement into the alloy chemistry itself, so that the material does the work internally during a controlled thermal cycle. The two studies, published in Communications Materials under the title Precipitation induced recrystallisation in a Ti-Fe-Mo bcc-superalloy driven by lattice misfit, and in Scripta Materialia under the title Precipitation induced recrystallisation (PIX) in undeformed W-Cr, together establish the mechanism across two chemically distinct systems, from a refractory metal destined for fusion reactors to a lightweight aerospace superalloy. If the principle generalises as broadly as the researchers suggest, the metals of future reactors and jet engines may owe their strength not to the hammer and the mill, but to heat treatment recipes that teach alloys to refine themselves as they age.

Subject of Research: Precipitation induced recrystallisation for grain refinement in tungsten and titanium alloys

Article Title: ‘PIX’ fusion and aerospace innovation for alloys that get finer with age

Article References: ‘PIX’ fusion and aerospace innovation for alloys that get finer with age. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: Precipitation Induced Recrystallisation, PIX, grain refinement, tungsten alloys, titanium alloys, fusion reactors, aerospace materials, heat treatment, recrystallisation, metallurgy, bcc-superalloy, University of Birmingham