Humans and sponges share gene regulation mechanisms

April 11, 2017
Humans and sponges share gene regulation mechanisms
The study used Great Barrier Reef sponge Amphimedon queenslandica. Credit: University of Queensland

Humans have a lot in common with the humble sea sponge, according to research that changes the way we think about animal evolution.

University of Queensland School of Biological Sciences researcher Dr Milos Tanurdzic said a collaborative study found use a complex toolkit similar to much more complex organisms such as humans.

Gene regulation refers to how and when a gene is activated.

"The research implies this complex mechanism was present at the evolutionary dawn of multicellular and across animal species as far apart as sponges and humans," Dr Tanurdzic said.

"Until very recently we thought increasing complexity in the animal kingdom was due to an ever-increasing number of that encode information about animal development and growth.

"However, the genomics explosion of the last decade taught us most animals have a similar number of genes encoded in their DNA.

"The alternative, and today the prevailing explanation, is that gene regulation is responsible for the evolution of animal diversity."

The study was largely undertaken by former UQ PhD student Dr Federico Gaiti, now at Weill Cornell Medicine in New York City, USA.

Dr Tanurdzic said a key mechanism responsible for regulating genes in multi-celled organisms was how the DNA was packaged within the genetic material, or genome.

"DNA associates with special proteins - called histones - in the nucleus," he said.

"Histones can bear certain chemical marks, which in turn determine if the DNA associated with them is going to be turned on or off."

Histone marking gone awry is also responsible for some of the more insidious genetic errors, such as when a normal cell becomes cancerous.

"Our study, which used a Great Barrier Reef sponge, Amphimedon queenslandica, set out to discover if this particular mechanism of gene regulation is present in the oldest multicellular animal lineage – the sponges," he said.

"Through analysis of DNA with certain marks we determined that histone-based gene is part of the sponge gene regulatory tool kit.

"As the common ancestor of humans and sponges probably lived 700 million years ago, this implies that gene regulatory complexity relying on histone marks was fundamental for the evolution of animal multicellularity and diverse animal forms and functions."

The study, published in eLife, brought together a multi-disciplinary team of scientists from the Degnan and Tanurdzic labs at UQ.

Explore further: Largest study of sponges sheds new light on animal evolution

More information: Federico Gaiti et al. Landscape of histone modifications in a sponge reveals the origin of animal-regulatory complexity, eLife (2017). DOI: 10.7554/eLife.22194

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1 / 5 (5) Apr 11, 2017
What they say:

"Humans have a lot in common with the humble sea sponge, according to research that changes the way we think about animal evolution."

What they really observe:

"Humans HAVE A LOT IN COMMON with the humble sea sponge"

What they observe corrobortates Creation by a Common Designer.

And, as they have to admit, "that changes the way we think about animal evolution".

As you can see, evolution comes always in the speculative part of the scientific article.

You can notice this same pattern in all the articles in which evolution is mentioned.

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