Thursday, September 04, 2025

 PLASTIC ALTERNATIVE

Biodegradable PET alternative bioproduced at unprecedented levels




Kobe University
250904-Tanaka-PDCA-Product 

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A Kobe University group now published that they achieved the production of PDCA — which is biodegradable and materials incorporating this show physical properties comparable to or even surpassing those of PET — in bioreactors at concentrations more than seven-fold higher than previously reported.

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Credit: TANAKA Tsutomu





The PET-alternative PDCA is biodegradable and has superior physical properties. A Kobe University team of bioengineers engineered E. coli bacteria to produce the compound from glucose at unprecedented levels and without byproducts — and opened up a realm of possibilities for the future of bioengineering.

The durability of plastics is both the reason why they have become so wide-spread and why they pose environmental problems. In addition, they are mainly sourced from petroleum, making them non-renewable and contingent on geopolitics. Research groups worldwide work on both biodegradable and bio-sourced alternatives, but there often are issues with yield, purity and — as a result — associated production cost.

Kobe University bioengineer TANAKA Tsutomu says: “Most biomass-based production strategies focus on molecules consisting of carbon, oxygen and hydrogen. However, there are highly promising compounds for high-performance plastics that include other elements such as nitrogen, but there are no efficient bioproduction strategies. And purely chemical reactions inevitably generate unwanted byproducts.” PDCA, which stands for pyridinedicarboxylic acid, is such a candidate. It is biodegradable, and materials incorporating this show physical properties comparable to or even surpassing those of PET, which is widely used in containers and textiles. “Our group approached the challenge from a new angle: We aimed to harness cellular metabolism to assimilate nitrogen and build the compound from start to finish,” says Tanaka.

In the journal Metabolic Engineering, the Kobe University group now published that they achieved the production of PDCA in bioreactors at concentrations more than seven-fold higher than previously reported. Tanaka explains, “The significance of our work lies in demonstrating that metabolic reactions can be used to incorporate nitrogen without producing unwanted byproducts, thereby enabling the clean and efficient synthesis of the target compound.”

The group, however, did have some stubborn problems to solve along the way. The most stubborn of these came when they discovered a bottleneck where one of the enzymes they had introduced produced the highly reactive compound hydrogen peroxide, H2O2. The compound then attacked the enzyme that produced it, thereby deactivating it. “Through refining the culture conditions, in particular by adding a compound that can scavenge H2O2, we could finally overcome the issue, although this addition may present new economic and logistical challenges for large-scale production,” says Tanaka.

The bioengineers already have plans on how to improve the production going forward, with every problem pointing the way to its solution. Looking at the future, Tanaka says: “The ability to obtain sufficient quantities in bioreactors lays the groundwork for the next steps toward practical implementation. More generally, though, our achievement in incorporating enzymes from nitrogen metabolism broadens the spectrum of molecules accessible through microbial synthesis, thus enhancing the potential of bio-manufacturing even further.”

This research was funded by the Japan Society for the Promotion of Science (grants 25K00054, 23H04565, 25H01701, 25K01594, 25H00819) and the Japan Science and Technology Agency (grant JPMJPR22N9).

Kobe University is a national university with roots dating back to the Kobe Higher Commercial School founded in 1902. It is now one of Japan’s leading comprehensive research universities with nearly 16,000 students and nearly 1,700 faculty in 11 faculties and schools and 15 graduate schools. Combining the social and natural sciences to cultivate leaders with an interdisciplinary perspective, Kobe University creates knowledge and fosters innovation to address society’s challenges.

 UK

“Cracks in the system” driving high suicide rates for autistic people



Bournemouth University






A new study, led by the University of Cambridge in collaboration with Bournemouth University, shows that autistic people identify loneliness, hopelessness and feelings of worthlessness and failure as key factors underpinning their suicidal feelings. Individuals who highlighted being unable to access the support they needed were more likely to have attempted suicide. Autistic women and gender minorities were disproportionately over-represented among those who struggled to access support.

The study, published in the journal Autism in Adulthood, is the largest survey of autism and suicide to date, involving almost 1400 autistic people (>90% from the UK). The research was instigated by the charity Autism Action, as part of its mission to reduce the number of autistic people who think about, attempt and die by suicide.

“We know from previous research that the number of autistic people attempting suicide is unacceptably high. Whilst one in 37 non-autistic people ever attempt suicide, approximately one in four autistic people do so,” said lead author Dr Rachel Moseley, Principal Academic in Psychology at Bournemouth University.

“Shockingly, almost forty percent of participants in this study had attempted suicide, with most of those having attempted suicide multiple times,” she added.

Where participants had identified mental illness, loneliness, hopelessness, and feelings of worthlessness as driving factors in their suicidal experiences, they had a lot to say about where these feelings came from. Many spoke about “traumatising” school days where they were victimised and lacked appropriate support, which continued into adult difficulties entering and staying in the workforce.

Key factors mentioned by participants were the strain caused by “inconsistent and unpredictable” health and social care, and battles with the “demeaning” and “cruel” benefits system - this left many feeling like a burden on their loved ones. The broader way that autistic people are stigmatised within society came to the fore in feelings of “sadness for the way you’re looked upon by others”. One person said they felt “too defective to live”.

Professor Sir Simon Baron-Cohen, Director of the Autism Research Centre at Cambridge University, and senior author of the study, said: “These findings suggest that many autistic people feel lost in a world which they feel does not care about or actively rejects them, and where they objectively do not have equal access to many of the things that people consider essential for good mental health”.

Participants said that they were often misunderstood, disbelieved and invalidated when they tried to seek professional support,  and that these experiences, where they were unable to access help, contributed to feelings of hopelessness and despair.

Those who highlighted these difficulties accessing help were most likely to have attempted suicide, pointing at the impact of negative experiences with services that are meant to be there to help. These problems were especially prominent for autistic women and for gender minorities such as transgender men and women, backing up previous findings that autistic women and gender minorities have more difficulty accessing services and having their needs understood and met by professionals.

Finally, participants said that having been overlooked for a diagnosis as a child was an important factor in their suicidal feelings, leaving them feeling “broken” and “different” throughout their lives. They highlighted that long waiting lists for assessment, and the absence of any post-diagnostic support, contributed to the hopelessness underlying suicidal thoughts.

The researchers conclude that these are sobering findings in relation to UK waiting times for autism assessment, with children and adults waiting years in what the charity Autism Action describe as ‘devastating delays’ that have serious long-term effects contributing to increased risk of suicide. The charity also highlights concerns about the many autistic people, diagnosed and undiagnosed, who receive little to no support.

Dr Moseley said “Our study shows that suicide in autistic people is a public health crisis rooted in cracks in the system – gaps and inequalities in access to education, employment, health and social care – through which autistic people are at risk of falling, and which contribute to suicide and excess mortality”.

“The findings should serve as an urgent call for action for key decision-makers in government. The results indicate that reducing waiting times for an autism assessment, and providing post-diagnostic care, as well as increasing capacity for health and social care professionals to support autistic people, should be priorities for the government,” she concluded.

Tom Purser, CEO of Autism Action, said “We know that Government needs to do more to create conditions in which autistic people can live equally rewarding, meaningful and dignified lives. This is why our charity has invested in the largest programme of research into autism and suicide in the UK.  This research reveals critical insights which we will be working hard to ensure are heard at the heart of Government, to drive long-overdue change.”

 

Biological ‘moonshot’ accelerates efforts to genetically map life on Earth



Published in Frontiers in Science, the new ambition of the Earth BioGenome Project (EBP) is to create a digital library of DNA sequences that will help us preserve life on Earth.




Frontiers






Published in Frontiers in Science, this is the new ambition of the Earth BioGenome Project (EBP)—a global network of scientists sequencing the genomes of Earth’s eukaryotes. Its goal? To create a digital library of DNA sequences that will help us preserve and protect life on Earth and tackle rapid environmental change. 

With a growing network of more than 2,200 scientists in 88 countries—including flourishing local and Indigenous research communities in the Global South—EBP is making discoveries that could help assure food security, advance medicine and agriculture, and drive a deeper global understanding of biodiversity to support conservation and pandemic prevention. 

Biological ‘moonshot’ 

EBP began global DNA sequencing in 2020 and is now sequencing genomes 10 times faster.  

New innovations to meet this ambitious ‘moonshot’ include portable ‘pop-up’ labs to expand sequencing capacity, as well as boosting engagement and inclusion in the world’s biodiversity-rich yet remote regions.  

“As biodiversity loss gathers pace, so must our work,’ said senior author Prof Harris Lewin at Arizona State University, in the US. “Our growing digital ‘genome ark’ is shifting what’s possible in genomics from isolated, expensive sequencing efforts to a global, scalable, and inclusive enterprise.” 

Strong roots 

By the end of 2024, EBP-affiliated projects had published 1,667 genomes covering more than 500 eukaryotic families. Network researchers also deposited a further 1,798 genomes meeting EBP standards, bringing the total number of genomes to 3,465.  

These data have illuminated the origins and evolution of life on Earth, and the role of genetic diversity in species’ ability to adapt to change. For example, they have helped reveal how Svalbard reindeer adapted to Arctic conditions, and how chromosomes evolved in butterflies and moths. The project’s research methods are also helping to improve tools such as environmental DNA (eDNA), which uncovers new lifeforms through the genetic footprints they leave behind.  

“We have laid the roots to build our digital ‘tree of life’—and our early outputs are already reshaping what we know about evolution, ecosystem function, and biodiversity,” said lead author Prof Mark Blaxter at the UK’s Wellcome Sanger Institute. 

Ambitious goals 

As EBP enters the second of its three phases, Phase II brings ambitious new goals that will rapidly accelerate the project’s work.  

Building on Phase I, Phase II aims to sequence 150,000 species—half of all known genera—within four years. It will prioritize species that are important to ecosystem health, food security, pandemic control, conservation, Indigenous peoples and local communities. 

It also aims to collect 300,000 samples, around half of which will form the basis of Phase III. 

Achieving this will require sequencing 3,000 new genomes per month—more than 10 times faster than current rates. The authors say that advances in technology are on their side: genome sequencing is now eight times cheaper than just a few years ago, which means budgets stretch further and work can accelerate. 

“It’s a biological moonshot in terms of the scale of ambition. As species vanish and ecosystems degrade, we aim to capture and preserve the biological blueprint of life on Earth for future generations,” said Prof Blaxter. "Understanding the origins and evolution of life on Earth is a human pursuit equivalent to understanding the origins and evolution of the universe."

Genome lab in a box 

The EBP’s authors highlight key challenges, including coordinating the global collection of 300,000 species and ensuring open, low-carbon data infrastructure.  

Much of the Earth’s biodiversity is found in the Global South. Therefore, vast amounts of the species collection, sample management, sequencing, assembly, annotation, and analysis will be delivered by local EBP partners. This will also help to ensure equitable access and culturally appropriate practices, while reducing societal and environmental impact.  

To accelerate sequencing in remote regions, the authors propose using self-contained ‘pop-up’ sequencing labs housed in shipping containers. Known as a ‘genome lab in a box’ (gBox), the labs could enable local and indigenous scientists, particularly in the Global South, to generate high-quality genomic data locally. 

"Chile is one of the world’s biodiversity hotspots with many endemic species, but these are under threat," said co-author and local EBP community member Prof Juliana Vianna from The Chilean 1000 Genomes Project at Pontificia Universidad Católica de Chile. "In addition, our species are often studied only after samples are exported. With gBoxes, we can change that. Local teams can generate the data here, in context, and immediately connect it to the conservation and sustainable management challenges we face on the ground." 

"Biodiversity scientists in low and lower middle-income countries confront daily the great irony of our species and our planet: that the lion’s share of funding and infrastructure for genomics is located at higher latitudes while the great bulk of biodiversity is found in the tropics,” said co-author and local EBP community member Dr Andrew J Crawford from Universidad de los Andes in Colombia. “The gBox would allow any nation on the globe to make its own choices, empower the next generation of researchers in biotech and computational biology, and impact national economies by asking novel questions and developing creative solutions." 

“The gBox isn’t just a lab—it’s a symbol of equity in science. By equipping local and Indigenous researchers with advanced genomic tools, we’re empowering the Global South to contribute on equal footing to the Earth BioGenome Project. This shift ensures biodiversity science is inclusive, locally driven, and culturally informed,” said co-author and local EBP community member Prof Montserrat Corominas at Universitat de Barcelona. 

Value for money

Since launching, EBP has created international standards, built a network of affiliated projects, and completed many of its Phase I targets. 

The projected cost of Phase II is $1.1 billion. This includes a $0.5 billion Foundational Impact Fund to support local training, infrastructure, and applied research in the Global South.  

The full cost of sequencing all 1.67 million named eukaryotic species in 10 years is estimated at $4.42 billion—less than the cost of the Human Genome Project or the Webb Telescope in today’s dollars. 

The authors say this investment is “very reasonable for a global effort with such a lasting impact.” 

ENDS 

To see the embargoed paper, or for author interviews, please contact:    

  • Please note the Frontiers press office business hours of Monday-Friday, 8:30 am-5:30 pm British Summer Time, excluding UK holidays. Queries received outside of these business hours will be answered the next business day. 

Notes to editors:   

  1. Please link to the original Frontiers in Science article in your reporting: “The Earth BioGenome Project Phase II: illuminating the eukaryotic tree of life” by Blaxter et al., published 4 September 2025 in Frontiers in Science. https://www.frontiersin.org/journals/science/articles/10.3389/fsci.2025.1514835/full [The link will go live with the full paper once the embargo lifts.]   

About Frontiers in Science    

Frontiers in Science is Frontiers’ multidisciplinary, open-access journal focused on transformational science to accelerate solutions for healthy lives on a healthy planet.     

The journal publishes a select number of exceptional peer-reviewed lead articles invited from internationally renowned researchers, whose work addresses key global challenges in human and planetary health. Each lead article is enriched by a diverse hub of content that extends its reach and impact across society—from researchers and policymakers to lay audiences and kids.     

For more information, visit www.frontiersin.org/science and follow @FrontScience on X, Frontiers in Science on LinkedIn, and @Frontiers on Bluesky.   

About Frontiers    

Frontiers is a leading research publisher. Our role is to provide the world’s scientists with a rigorous and efficient publishing experience. Scientists empower society and our mission is to accelerate collaboration and discovery by making science open—enabling researchers to find the solutions we all need for healthy lives on a healthy planet. Powered by custom-built technology, artificial intelligence, and a collaborative peer review, our community journals give experts in more than 1,800 academic fields an open access platform to publish high quality, high impact research. Through our outreach work to build strong partnerships with business, policymakers, and educators, we’re leading the transition to open science.   

For more information, visit www.frontiersin.org and follow @Frontiersin on X and @Frontiers on Bluesky.  

About the Earth BioGenome Project (EBP) 

The Earth BioGenome Project (EBP) is one of the most ambitious biological initiatives ever undertaken: a global collaboration to sequence, catalog, and characterize the genomes of all known eukaryotic life on Earth. By building a comprehensive digital library of biodiversity genomes, EBP will revolutionize how we study, safeguard, and sustain life in the face of accelerating environmental change. 

Over the past five years, EBP has united more than 2,200 researchers from 88 countries, producing thousands of high-quality reference genomes and laying the foundation for global-scale biodiversity genomics. A recent Frontiers in Science article outlines the roadmap for Phase II, following the success of the project’s first phase. Phase II will sequence 150,000 species—representing half of all known genera—within four years, prioritizing species vital to ecosystem health, food security, disease control, conservation, and those of significance to Indigenous Peoples and local communities. 

Through open data sharing and strengthened international partnerships, particularly in biodiversity-rich regions of the Global South, EBP is creating the genomic foundation for conservation, innovation, and sustainable futures worldwide. 

 

Hidden chemistry of Earth’s core revealed by how it froze




University of Oxford

Cartoon of the Earth 

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Cartoon of the Earth with cutaway showing the mantle and inner and outer core. Magnetic field lines produced by the geodynamo extend into space and interact with the solar wind.

The iron-rich core at Earth’s centre is slowly freezing from the inside out. This growth of the solid inner core powers the magnetic field that shields our planet from harmful space weather. How and when the inner core first began to freeze remains a mystery but new research shows that solving it could reveal the core’s composition, giving us a clearer picture of Earth’s deep interior.

Image credit: Dr Alfred Wilson

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Credit: Dr Alfred Wilson





A new study by researchers at the University of Oxford, University of Leeds, and University College London has identified a new constraint on the chemistry of Earth’s core, by showing how it was able to crystallise millions of years ago. The study has been published today (4 September) in Nature Communications.

The researchers showed that the core would need to be made of 3.8% carbon for it to have begun crystallising. This result indicates that carbon may be more abundant in Earth’s core than previously thought, and that this element could have played a key role in how it froze, offering a rare glimpse into the processes occurring at the heart of our planet.

Earth’s inner core, the solid iron-rich mass at the centre of our planet, is slowly growing as the surrounding molten outer core cools and freezes. But this process has been a source of debate amongst scientists for decades.

Inner core formation is not just a matter of determining when the core cooled to its freezing point, but instead involves the process of crystallisation which depends on its exact chemical composition. Like water droplets in clouds, which can cool to -30 °C before forming hail, molten iron must be supercooled (cooled to below its melting point) before it can freeze.

Previous calculations have suggested that 800-1000 °C of supercooling would be needed to initiate freezing of the core if it were made of pure iron.

However, if the core is supercooled to this degree, researchers have shown that the inner core would grow massively, and the Earth’s magnetic field would fail. But neither of these outcomes have occurred during our planet’s history. Instead, scientists believe that in the past, the core could have cooled to no more than about 250 °C below its melting point.

This new research aimed to understand how the inner core exists as observed today with such limited supercooling in the past. Without direct access to the Earth’s deep interior, the research team needed to rely on computer simulations of the freezing process.

They looked at the presence of other elements, specifically silicon, sulphur, oxygen, and carbon, and how these might affect the freezing process.

“Each of these elements exist in the overlying mantle and could therefore have been dissolved into the core during Earth’s history,” explained co-author Associate Professor Andrew Walker (Department of Earth Sciences, University of Oxford). “As a result, these could explain why we have a solid inner core with relatively little supercooling at this depth. The presence of one or more of these elements could also rationalise why the core is less dense than pure iron, a key observation from seismology.”

Using atomic-scale computer simulations of around 100,000 atoms at supercooled temperatures and pressures equivalent to those in the inner core, the research team tracked how often small crystal-like clusters of atoms formed from a liquid. These “nucleation” events are the first steps toward freezing.

What they found was surprising: silicon and sulphur, elements often assumed to be present in the core, actually slow down the freezing process. In other words, more supercooling would be needed to start forming the inner core if these elements were abundant in that part of the Earth.

On the other hand, they found that carbon helped to accelerate freezing in the simulation.

In the study, the researchers tested how much supercooling would be required to freeze the inner core if 2.4% of the core’s mass were made of carbon. The result: about 420 °C, still too high, but the closest result to viability yet.

But when they extrapolated their results to a case where 3.8% of the core’s mass is carbon, the required supercooling dropped to 266 °C. This is the only known composition that could explain both the nucleation and observed size of the inner core.

This result indicates that carbon may be more abundant in Earth’s core than previously thought, and that without this element, the formation of a solid inner core may never have happened.

The experiments also show that inner core freezing was possible with just the right chemistry, and unlike water when it forms hail, it did so without “nucleation seeds”, tiny particles which help to initiate freezing. This is vital, because when tested in previous simulations, all of the candidates for nucleation seeds in the core have melted or dissolved.

Lead author Dr Alfred Wilson (School of Earth and Environment, University of Leeds) said: “It is exciting to see how atomic scale processes control the fundamental structure and dynamics of our planet. By studying how Earth’s inner core formed, we are not just learning about our planet’s past. We’re getting a rare glimpse into the chemistry of a region we can never hope to reach directly and learning about how it could change in the future.”

Scientists have debated when the inner core began to solidify for decades, with some arguing for an ancient inner core (with freezing beginning more than two billion years ago) and others suggesting a much younger age (less than half a billion years). With this new information about the carbon content of the core, we are one step closer to constraining its chemistry and physical properties, and therefore how it evolved.

Notes:

For media enquiries and interview requests, contact Associate Professor Andrew Walker andrew.walker@earth.ox.ac.uk and Dr Alfred Wilson A.J.Wilson1@leeds.ac.uk

Images relating to the study which can be used in articles can be found at https://drive.google.com/drive/folders/1-x0PwsD2RahXRVuFtAt6RHAmPaaYVzkZ?usp=sharing. These images are for editorial purposes relating to this press release only and MUST be credited (see captions document in file). They MUST NOT be sold on to third parties.

The study ‘Constraining Earth’s core composition from inner core nucleation’ will be published in Nature Communications at 10:00 BST / 05:00 ET Thursday 4 September 2025 at https://doi.org/10.1038/s41467-025-62841-4. To view a copy of the study before this under embargo, contact Dr Alfred Wilson A.J.Wilson1@leeds.ac.uk.

The work was funded by the Natural Environment Research Council (NERC).

About the University of Oxford

Oxford University has been placed number 1 in the Times Higher Education World University Rankings for the ninth year running, and ​number 3 in the QS World Rankings 2024. At the heart of this success are the twin-pillars of our ground-breaking research and innovation and our distinctive educational offer.

Oxford is world-famous for research and teaching excellence and home to some of the most talented people from across the globe. Our work helps the lives of millions, solving real-world problems through a huge network of partnerships and collaborations. The breadth and interdisciplinary nature of our research alongside our personalised approach to teaching sparks imaginative and inventive insights and solutions.

Through its research commercialisation arm, Oxford University Innovation, Oxford is the highest university patent filer in the UK and is ranked first in the UK for university spinouts, having created more than 300 new companies since 1988. Over a third of these companies have been created in the past five years. The university is a catalyst for prosperity in Oxfordshire and the United Kingdom, contributing around £16.9 billion to the UK economy in 2021/22, and supports more than 90,400 full time jobs.


Cartoon cross section of the Earth showing the mantle, outer core and inner core. Convection in the outer core produces Earth's geomagnetic field.

The properties of Earth’s iron-rich core are key to understanding our planet’s deep interior, from its temperature to the way it generates the global magnetic field. The core’s exact chemistry remains unknown, but new research suggests that the process which triggered the freezing of the solid inner core from the surrounding liquid outer core could reveal its composition and shed light on its mysterious properties.

Cartoon of iron and carbon atoms nucleating  to form solids which could initiate growth of Earth's solid inner core.

The authors used atomic scale simulations to identify solids nucleating in supercooled liquids. They found that carbon atoms can accelerate this process, perhaps enough to trigger the freezing of Earth's solid inner core.

Image credit: Dr Alfred Wilson