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Harpagifer fin mitochondria and nucleic acid.
Photo Credit: Francesca van Tartwijk, Anne-Pia Marty, and Amir Rahmani
Scientific Frontline: Extended "At a Glance" Summary: Sub-Zero Live-Cell Microscopy and Antarctic Fish Adaptation
The Core Concept: Researchers engineered a novel microscope capable of operating near 0 degrees Celsius, enabling the first-ever high-resolution observations of living Antarctic fish cells to understand their survival mechanisms in extreme cold.
Key Distinction/Mechanism: Unlike the slow whole-body development of cold-adapted organisms, their intracellular movement remains remarkably fast. To combat the inefficiency of protein synthesis and the high rate of protein misfolding caused by cold, cells of the Antarctic spiny plunderfish (Harpagifer antarcticus) feature enlarged lysosomes for waste disposal and fused, networked mitochondria for enhanced energy production.
Origin/History: On September 23, 2026, a research team led by the British Antarctic Survey and the University of Cambridge's Department of Chemical Engineering and Biotechnology announced this technological microscopy breakthrough alongside the first successful culturing of Antarctic fish cells.
Major Frameworks/Components:
- Sub-Zero Fluorescence Microscopy: Custom-engineered imaging technology that captures high-resolution, dynamic images of living cells at temperatures near freezing without damaging the extremophile specimens.
- Extremophile Cell Culturing: Novel laboratory techniques developed to isolate and maintain live cells from Harpagifer antarcticus for comparative cellular analysis against temperate species, such as the shanny (Lipophrys pholis).
- Mitochondrial Networking: A cellular adaptation in which mitochondria merge into larger, interconnected networks to optimize energy production and protect themselves in cold environments.
- Lysosomal Degradation: The utilization of enlarged lysosomes acting as cellular recycling centers to efficiently break down and dispose of harmful, misfolded proteins.
Branch of Science: Cell Biology, Cryobiology, Marine Biology, Bioengineering, Genetics.
Future Application: Insights into how these cells manage misfolded proteins could inform treatments for human neurodegenerative diseases, such as Alzheimer's, Parkinson's, and Huntington's. The research could also improve the cold preservation of donated human tissues and enable more sustainable, energy-efficient manufacturing processes in the biotechnology industry.
Why It Matters: Uncovering these cellular adaptations clarifies why Antarctic species are highly vulnerable to the minor temperature increases associated with climate change, while providing a revolutionary experimental capability for studying fundamental biological systems under extreme conditions.
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| An Antarctic plunderfish pictured near Rothera. Photo Credit: Simon Brockington, BAS |
Cambridge engineers have built the first microscope to see inside living cells in subzero conditions, revealing secrets of Antarctic fish survival.
Scientists have captured the first-ever high-resolution images of living Antarctic fish cells using a new microscope engineered to operate at near 0°C. The breakthrough reveals how these cold-blooded animals have adapted at a cellular level to survive year-round in the Southern Ocean, where temperatures range between −1.8°C and 2°C.
The research, led by the British Antarctic Survey and the Department of Chemical Engineering and Biotechnology (CEB) at the University of Cambridge, could also offer wider insights relevant to human biology, including how cells cope with protein misfolding, a process seen in diseases like Alzheimer’s and Parkinson’s.
Studying cold-adapted cells has historically been a technological challenge. Cold-temperature microscopy has previously produced only low-resolution images, and keeping live cells from cold-adapted species at their natural temperature has proved difficult. To solve this, engineers at CEB designed a new microscope capable of performing cutting-edge fluorescence microscopy at close to 0°C, giving researchers a never-before-seen look into living, cold-adapted cells.
The team cultured cells from the Antarctic spiny plunderfish (Harpagifer antarcticus)—a small, bottom-dwelling fish found in shallow waters in the Southern Ocean and subantarctic islands. This was the first time Antarctic fish cells had ever been cultured, and it required scientists to develop a new cell-culturing technique that can now be used in future research.
For comparison, they also cultured cells from the shanny (Lipophrys pholis), a small fish found in shallow waters around the UK. Using fluorescent dyes and the new microscope, the team was able to compare the structure and behavior of the two species’ cells.
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Harpagifer skin mitochondria.
Photo Credit: Francesca van Tartwijk, Anne-Pia Marty, and Amir Rahmani
The Protein Problem
The researchers found that the cold-adapted cells have developed several "workarounds" to cope with low temperatures and the difficulties these create for normal cell function, especially around energy production and protein folding.
The cells’ "engines"—the mitochondria—have merged into larger, connected networks, and there are more mitochondria overall. The researchers think this could be the cell’s way of producing more energy and protecting the mitochondria because making protein is inefficient in the cold.
The lysosomes, which act as the cells’ recycling bins, were also larger in the Antarctic fish cells. The researchers think this indicates the cell is working hard to break down and dispose of the higher numbers of damaged or misfolded proteins that occur in the cold.
"Protein isn’t just something we eat—it’s a critical part of basic cell biology. Proteins start off as long chains of molecules called amino acids, a bit like a string of beads. These chains then fold themselves into a precise shape, almost like origami, and this shape determines everything about what a protein can do.
"Low temperatures—like those in the Southern Ocean—slow down and disrupt this process, making mistakes in the folding more likely. A misfolded protein is useless at best but can be really harmful, so these cold-adapted cells need ways of dealing with them."
A potentially surprising finding was that, despite cold-adapted animals being extremely slow at the whole-body level—they are slow to develop and slow to grow—movement within their cells is not. The mitochondria in cold-adapted cells move at surprisingly high speeds, and the basic process of how different molecules organize themselves inside cells still works normally. This challenges previous assumptions that adapting to the cold means everything slows down.
"Antarctic animals are incredibly vulnerable to climate change—we already know this. Raising temperatures just a few degrees can be lethal. We want to unravel why Antarctic species have such low tolerances for increases in temperature—are their limits set by their cell biology, or is it their whole-body systems, like circulation?"
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Dr. Francesca van Tartwijk
Photo Credit: CEB
From Fish to Therapeutics
In addition to learning more about why Antarctic species are struggling in a changing climate, the research could have implications for human biology and therapeutics.
Protein misfolding is a key feature of human neurodegenerative diseases like Alzheimer’s, Parkinson’s, and Huntington’s. Understanding how Antarctic fish cope with high levels of protein misfolding may, over time, help researchers identify techniques that could be useful in therapeutics for these diseases. Learning more about the cold-resistant mechanisms at play in Antarctic fish cells could also help researchers understand how to protect donated human tissue while it is kept cold.
Another potential application is improving the sustainability of biotechnology. Currently, many biotechnical processes happen at higher temperatures, where the cells and enzymes work best. However, this requires more energy use. Studying cold-adapted cells could help us explore lower-temperature, more sustainable processes.
"Our work is exciting and important because it allows us to explore questions that have, until now, remained beyond the reach of science. Our findings have the potential to affect a range of scientific disciplines and applications, far beyond ecology and the polar regions."
Professor Clemens Kaminski, head of the department at CEB and co-lead on the project, said:
"It is super exciting to be able to study living cells at subzero temperatures and see with our own eyes what is going on. The team has established a new experimental capability and provided insights that we simply could not have gathered before. It’s a great example of how advances in scientific instruments can lead to entirely new areas of discovery.
"The next step is to develop imaging technologies that will allow us to study biological systems under controlled conditions that more closely reflect the polar environments in which they evolved."
Dynamic live-cell imaging at subzero temperatures is partially funded by Read more about the project on the British Antarctic Survey website. The researchers’ initial findings are available as a preprint: "Antarctic Fish Cell Cultures Show Adaptation of Organelle Morphology and Dynamics to Extreme Cold."
Funding: UKRI. (UK Research and Innovation)
Published in journal: BioRxiv (preprint)
Title: Antarctic fish cell cultures show adaptation of organelle morphology and dynamics to extreme cold
Authors: Francesca W. van Tartwijk, Anne-Pia M. Marty, Amir Rahmani, Yuetong Jia, Edward N. Ward, Isa Hussain, Lloyd S. Peck, Clemens F. Kaminski, and Melody S. Clark
Source/Credit: British Antarctic Survey
Edited by: Scientific Frontline
Reference Number: cbio092326_01
