Weekly News

Deeper origin of gill evolution suggests 'active lifestyle' link in early vertebrates

February 10,2017 03:13

A new study has revealed that gills originated much deeper in evolutionary history than previously believed. The findings support the idea that gills evolved before the last common ancestor of all vertebrates, helping facilitate a "lifestyle transition ...and more »



February 9, 2017

A hatchling little skate (Leucoraja erinacea) is shown. Credit: J. Andrew Gillis
A new study has revealed that gills originated much deeper in evolutionary history than previously believed. The findings support the idea that gills evolved before the last common ancestor of all vertebrates, helping facilitate a "lifestyle transition" from immobile filter-feeder to actively swimming predator.

The research, published today in the journal Current Biology, shows that gills develop from the same embryonic tissue in both jawed and jawless vertebrates - a lineage that split very early in our ancestral tree.
Jawed vertebrates - such as fish, birds and mammals - make up 99% of all living vertebrates, including us. Jawless vertebrates include the parasitic lamprey and scavenging hagfish: eel-like creatures that diverged from the ancestral line over 400 million years ago.
Previous work in this area involved slicing thin sections of fish embryos to chart organ growth. These "snapshots" of development led scientists to believe that gills were formed from different tissues: the internal 'endoderm' lining in jawless vertebrates, and the 'ectoderm' outer skin in the jawed.
As a result, since the mid-20th century it was thought that the ancient jawed and jawless lines evolved gills separately after they split, an example of 'convergent evolution' - where nature finds the same solution twice (such as the use of echolocation in both bats and whales, for example).
Biologists at the University of Cambridge used fluorescent labelling to stain cell membranes in skate embryos, and tracked them through the dynamic development process. Their experiment has now shown that the gills of jawed vertebrates emerge from the same internal lining cells as their jawless relatives.
The researchers say this is strong evidence that gills evolved just once, much earlier in evolutionary history - before the jawless divergence - and that the "crown ancestor" of all vertebrates was consequently a more anatomically complex creature.
The findings pull the invention of gills closer to the "active lifestyle" shift in our early ancestors: the evolution from passive filter feeders to self-propelled ocean swimmers. Scientists say that gill development may have been a catalyst or consequence of this giant physiological leap.
"These findings demonstrate a single origin of gills that likely corresponds with a key stage in vertebrate evolution: when some of our earliest relatives transitioned from filtering particles out of water pumped through static bodies to actively swimming through the oceans," says lead author Dr Andrew Gillis, a Royal Society University Research Fellow in Cambridge's Department of Zoology, and a Whitman Investigator at the Marine Biological Laboratory in Woods Hole, US.

Early skate embryo with endoderm cells labeled with fluorescent dye. The dye persists in the cells each time they divide, allowing scientists to trace their differentiation into specific cell types, including gill. Credit: J. Andrew Gillis
"Gills provided vertebrates with specialist breathing organs in their head, rather than having to respire exclusively through skin all over the body. We can't say whether these early animals became more active and needed to evolve a new respiratory mechanism, or if it was gill evolution that allowed them to move faster.

"However, whether by demand or opportunity, our work suggests that the physiological innovation of gills occurred at the same time as the lifestyle transition from passive to active in some of our earliest ancestors."
While the jawed vertebrate lineage spawned the majority of vertebrate life that exists on Earth today - "evolutionarily speaking, we are all bony fish," says Gillis - lamprey and hagfish are the living remnants of a once extensive assemblage of primitively predatory jawless vertebrates.
"Lamprey are eel-like parasites that use their tooth-like organs and raspy tongue to latch onto fish and suck out the blood, while hagfish scavenge by taking bites out of dead matter," he says.
Gillis and colleagues used embryos of the little skate to track early gill development through cell tracing. The skate is a cartilaginous fish - an early-branching lineage of jawed vertebrates that includes the sharks and stingrays.
This made skate an excellent comparison point to try and infer the primitive anatomical and developmental conditions in the last common ancestor of jawed and jawless vertebrates.
The embryonic work of the Gillis laboratory neatly complements paleontological research from their Cambridge colleague Prof Simon Conway Morris, who has spent much of his career studying fossils of the Cambrian period of rapid evolution - when most major animal groups originated.
In 2014, Conway Morris was part of the team that discovered Metaspriggina: one of the oldest-known vertebrate fossils, perhaps over 500 million years old, which displayed hints of a gill structure, as well as the muscle arrangement of an active swimmer.
"Our embryological research helps us understand exactly how the gill structures in early vertebrates such as Metaspriggina relate to the gills of living forms," says Gillis.
"Embryology can tell us about the evolutionary relationship between anatomical features in living animals, while palaeontology can pinpoint precisely when these features first appear in deep time. I think that this work nicely illustrates how these two areas of research can inform one another."

Explore further:
Sonic hedgehog gene provides evidence that our limbs may have evolved from sharks' gills

More information:
Gillis, J. Andrew and Tidswell, Olivia R.A. (2017) The Origin of Vertebrate Gills. Current Biology, DOI: 10.1016/j.cub.2017.01.022

Sonic hedgehog gene provides evidence that our limbs may have evolved from sharks' gills

Latest analysis shows that human limbs share a genetic programme with the gills of cartilaginous fishes such as sharks and skates, providing evidence to support a century-old theory on the origin of limbs that had been widely ...

Our ideas about vertebrate evolution challenged by a new tree of life

The placoderms were a diverse group of ancient armoured fishes and it's widely believed that they are ancestral to virtually all vertebrates alive today, including humans.

Jawless fish brains more similar to ours than previously thought

Researchers at the RIKEN Evolutionary Morphology laboratory and other institutions in Japan have shown that complex divisions in the vertebrate brain first appeared before the evolution of jaws, more than 500 million years ...

Research links evolution of fins and limbs with that of gills

The genetic toolkit that animals use to build fins and limbs is the same genetic toolkit that controls the development of part of the gill skeleton in sharks, according to research to be published in Proceedings of the National ...

Discovery sheds light on how vertebrates see

New research led by the University of Leicester has overturned a long-standing theory on how vertebrates evolved their eyes by identifying remarkable details of the retina in the eyes of 300 million year-old lamprey and hagfish ...

Lamprey gene helps scientists discover how the human brain appeared

Researchers at the M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences have collaborated with their colleagues from the A.N. Severtsova Institute of Ecology and Evolution ...

Climate change responsible for rapid expansion of horse species over last 20 million years

Changing environments and ecosystems were driving the evolution of horses over the past 20 million years. This is the main conclusion of a new study published in Science by a team of palaeontologists from Spain and Argentina. ...

Deeper origin of gill evolution suggests 'active lifestyle' link in early vertebrates

A new study has revealed that gills originated much deeper in evolutionary history than previously believed. The findings support the idea that gills evolved before the last common ancestor of all vertebrates, helping facilitate ...

Broken pebbles offer clues to Paleolithic funeral rituals

Humans may have ritualistically "killed" objects to remove their symbolic power, some 5,000 years earlier than previously thought, a new international study of marine pebble tools from an Upper Paleolithic burial site in ...

Students recreate 5,000-year-old Chinese beer recipe

On a recent afternoon, a small group of students gathered around a large table in one of the rooms at the Stanford Archaeology Center.

Key friendships vital for effective human social networks

Close friendships facilitate the exchange of information and culture, making social networks more effective for cultural transmission, according to new UCL research that used wireless tracking technology to map social interactions ...

Mobile phone and satellite data to map poverty

An international team has, for the first time, developed a way of combining anonymised data from mobile phones and satellite imagery data to create high resolution maps to measure poverty.

Physics News,Science news,Technology News,Physics,Materials,Nanotech,Technology,Science

Share this article

Related videos

Die 5 Biologischen Naturgesetze - Die Dokumentation
Die 5 Biologischen Naturgesetze - Die Dokumenta...
Что такое инсулиновый отклик?
Что такое инсулиновый отк...

DON'T MISS THIS STORIES