Prostate Cancer Screening with 100 Biomarkers and AI, Artificial Sweeteners and Arterial Disease, Fossil Collagen, and Turtle Magnetoreception on Naked Scientists

Summary

The Naked Scientists explore a Cambridge based multi-omics AI test for prostate cancer screening that integrates PSA with hundreds of biomarkers to deliver high diagnostic accuracy, along with broader science news across health, paleontology and animal navigation.

• Prostate cancer screening uses 100 biomarkers including PSA as one marker; AI drives a high sensitivity and specificity, aiming to enable earlier detection.
• Artificial sweeteners may accelerate arterial disease in mice through insulin driven inflammatory signaling, prompting caution about long term intake.
• Fossil bones may preserve original organic molecules, including collagen, challenging long held views about fossilisation and opening doors for ancient biomolecular analyses.
• Turtles can learn and remember magnetic field signatures to locate food, with RF fields affecting their compass sense and implying distinct map and compass mechanisms.
• A vaccination question of the week underscores herd immunity and vaccines as a public health triumph, while noting access challenges and inequities.

Introduction to the podcast topics

The Naked Scientists episode surveys several science breakthroughs spanning medicine, biology, paleontology and ecology. The hosts describe a Cambridge based screening test for prostate cancer that uses a multi-omics approach and an AI algorithm to integrate hundreds of biomarkers alongside PSA. They also examine a study linking artificial sweeteners with arterial disease in mice, a Liverpool led biomolecular analysis showing that ancient fossils preserve original organic material, and a turtle navigation study that reveals magnetic field memory. The episode closes with a Question of the Week on vaccination and herd immunity and a discussion of global health inequities.

Prostate cancer screening with 100 biomarkers and AI

The central medical story concerns a Cambridge based company announcing a potentially game changing screening test for prostate cancer. Prostate cancer is widely diagnosed in men and there is no national screening programme in England. The test uses a meta analysis of around 100 biomarkers and PSA is included as one biomarker among many. An AI algorithm combines data from these biomarkers along with phenotypic information to produce a readout that indicates cancer likelihood, potential aggressiveness and hereditary risk factors. The researchers report accuracy in the high 90s, around 96–99 percent in their internal validation, a significant improvement over PSA alone which is roughly 43 percent accurate. The test also promises to stratify cancers by likely slow growth versus aggressive forms, and to aid MRI planning by providing a rich data set before imaging. The researchers emphasise that the method is AI driven and continually learning by incorporating a wide range of variables from patient age to lifestyle. They stress that the test is not yet commercially available and needs final validation and regulatory approval, with a target launch around twelve months after completing validation studies. The clinical implications could be substantial, potentially enabling earlier detection and more precise decision making about biopsy and treatment, while potentially reducing unnecessary MRI and invasive procedures for those at low risk.

Artificial sweeteners and arterial disease in mice

The episode then moves to a study published in Cell Metabolism that investigates artificial sweeteners, focusing on aspartame. Mice given human-equivalent amounts of aspartame showed accelerated arterial disease. The team suggests the mechanism involves sweet taste induced insulin release, which then affects endothelial cells in blood vessels and upregulates inflammatory genes. While the study is in mice and uses dietary models to mimic human exposure, the researchers argue that the mechanism could be conserved in humans and caution against consuming artificially sweetened beverages as a straightforward sugar substitute. The interview with Yihai Chao highlights that many people, including younger populations, drink diet beverages, and the result raises questions about potential vascular consequences. The conversation also touches on the broader public health narrative around artificial sweeteners and metabolic health, without providing human trial data. The overall takeaway is that sweeteners may not be benign regarding vascular health, at least in the studied models, and that further research in humans is needed to fully understand the implications for dietary guidelines.

Preservation of original organic molecules in fossils

In another segment, Liverpool scientists present evidence that ancient fossils retain original organic material, including collagen, challenging the long standing belief that fossilisation completely erases such molecules. The team combines four analytical approaches: laser spectroscopy to detect organics, cross polarized light to image collagen distribution, bottom up proteomics to fingerprint collagen, and a separate metric based on hydroxyproline content to quantify collagen. The sequences obtained from sequencing collagen and matching it to modern bone collagen serve as a robust chain of evidence for genuine preserved biomolecules in fossils spanning medieval times to the dinosaurs. The discussion highlights the extraordinary resolving power of modern mass spectrometry and the prospects for future biomolecule sequencing even in ancient samples, including potential pathways for recovering DNA in the distant future. The work underscores methodological advances in mass spectrometry and proteomics that enable detection of trace biomolecules in fossils and opens up intriguing possibilities for reconstructing ancient biology from preserved proteins and amino acids.

Turtles learning magnetic signatures and conservation implications

The Nature published study on loggerhead turtles demonstrates that these animals can learn and remember the magnetic signatures associated with specific locations. The researchers conditioned sea turtles to receive food in a chosen magnetic field and observed a persistent “turtle dance” when in the field associated with nourishment. They used radio frequency fields to probe the sensory mechanisms involved, finding that chemical magnetoreception underlies the compass sense while the map sense remains to be fully explained. The result suggests the existence of at least two separate magnetoreception mechanisms, possibly analogous to separate senses in other animals, with the compass relying on chemical processes. The study has conservation implications because RF fields produced by everyday devices could disrupt a turtle’s ability to orient during critical life stages like nesting and hatchling emergence. The researchers call for awareness of electromagnetic frequencies and their potential impacts on wildlife beyond laboratory settings.

Vaccination and herd immunity (Question of the Week)

The final segment features a vaccination Q&A with Helen Bedford from University College London. The discussion underscores vaccines as a global health success story, illustrating how vaccines save millions of lives when widely used, through control of diseases such as smallpox and measles. The concept of herd immunity is explained as community protection for those who cannot be vaccinated due to age or health status, and the podcast notes ongoing challenges with access, funding and health service delivery that lead to inequities. The message emphasises that vaccines have broad benefits beyond preventing death, including long term disability avoidance, and that vaccine coverage remains essential to protect vulnerable populations and support health system resilience.

Overall, the episode showcases how diverse scientific advances—from AI driven diagnostics to molecular palaeontology and animal sensory biology—are being explored in the Naked Scientists programme, illustrating the breadth of contemporary science and its implications for health, biodiversity and public policy.