Skip to main content

TAU researchers discover unique, non-oxygen breathing animal

Written on |

The tiny relative of the jellyfish is parasitic and dwells in salmon tissue.

Researchers at Tel Aviv University have discovered a non-oxygen breathing animal. The unexpected finding changes one of science’s core assumptions about the animal world.A study on the finding was published on February 25 in PNAS by TAU researchers led by Prof. Dorothee Huchon of the School of Zoology at TAU’s George S. Wise Faculty of Life Sciences and Steinhardt Museum of Natural History.The tiny, less than 10-celled parasite Henneguya salminicola lives in salmon muscle. As it evolved, the animal, which is a myxozoan relative of jellyfish and corals, gave up breathing and consuming oxygen to produce energy.

Living without oxygen

“Aerobic respiration was thought to be ubiquitous in animals, but now we confirmed that this is not the case,” Prof. Huchon explains. “Our discovery shows that evolution can go in strange directions. Aerobic respiration is a major source of energy, and yet we found an animal that gave up this critical pathway.”Some other organisms like fungi, amoebas or ciliate lineages in anaerobic environments have lost the ability to breathe over time. The new study demonstrates that the same can happen to an animal — possibly because the parasite happens to live in an anaerobic environment.Its genome was sequenced, along with those of other myxozoan fish parasites, as part of research supported by the U.S.-Israel Binational Science Foundation and conducted with Prof. Paulyn Cartwright of the University of Kansas, and Prof. Jerri Bartholomew and Dr. Stephen Atkinson of Oregon State University.

Reversing what we know about evolution

The parasite’s anaerobic nature was an accidental discovery. While assembling the Henneguya genome, Prof. Huchon found that it did not include a mitochondrial genome. The mitochondria is the powerhouse of the cell where oxygen is captured to make energy, so its absence indicated that the animal was not breathing oxygen.Until the new discovery, there was debate regarding the possibility that organisms belonging to the animal kingdom could survive in anaerobic environments. The assumption that all animals are breathing oxygen was based, among other things, on the fact that animals are multicellular, highly developed organisms, which first appeared on Earth when oxygen levels rose. “It’s not yet clear to us how the parasite generates energy,” Prof. Huchon says. “It may be drawing it from the surrounding fish cells, or it may have a different type of respiration such as oxygen-free breathing, which typically characterizes anaerobic non-animal organisms.” According to Prof. Huchon, the discovery bears enormous significance for evolutionary research.“It is generally thought that during evolution, organisms become more and more complex, and that simple single-celled or few-celled organisms are the ancestors of complex organisms,” she concludes. “But here, right before us, is an animal whose evolutionary process is the opposite. Living in an oxygen-free environment, it has shed unnecessary genes responsible for aerobic respiration and become an even simpler organism.”

Related posts

The Reason Behind the Dancing Sunflowers

21 August 2024

Animals Experience War Stress Too

18 August 2024

How a Brain Parasite Becomes a Brain Cure

4 August 2024

Can Bats Think Ahead of Time?

25 July 2024

Tel Aviv University Shatters Limits with Self-Repairing Glass

26 June 2024

Global Coral Crisis: Deadly Sea Urchin Disease Discovered

22 May 2024

Wake-Up Call: Global Warming and Deforestation Threaten Wildlife

21 May 2024

Go Fish: Decline in Poleward-Moving Fish

4 April 2024

Do Viruses Have Consciousness?

17 March 2024

Unlocking Quantum Mysteries with Pendula

17 March 2024

Bye Bye Birdie: How Will Crows Survive Without Us?

10 March 2024

Revolutionizing Plant Cloning: Boosting Global Agriculture?

20 February 2024

A Scientific Breakthrough That Will Help Increase Plant Yields in Dry Conditions

31 January 2024

Head of Science at the Chan Zuckerberg Initiative Meets TAU’s Scientific Community

2 August 2023

Researchers Produce Highly Efficient, Low-cost “Green” Hydrogen

17 July 2023

Researchers Induce Cancer Cell “Suicide”

17 July 2023

Victoria

Tok Corporate Centre, Level 1,
459 Toorak Road, Toorak VIC 3142
Phone: +61 3 9296 2065
Email: [email protected]

New South Wales

Level 22, Westfield Tower 2, 101 Grafton Street, Bondi Junction NSW 2022
Phone: +61 418 465 556
Email: [email protected]

Western Australia

P O Box 36, Claremont,
WA  6010
Phone: :+61 411 223 550
Email: [email protected]