Invertebrates Can Tell Good Bacteria from Bad

Topic: Biology

Scientists have discovered that sea anemones can tell good bacteria from bad. They found this out by studying how these animals defend themselves against infections. This is a surprising finding because it was thought that only vertebrates, like humans and animals with backbones, could do this.

Researchers from Heinrich Heine University Düsseldorf (HHU) and Kiel University (CAU) studied the immune system of sea anemones. They found that these animals can selectively distinguish between different microorganisms.

The researchers focused on a type of structure called nematosomes, which are like tiny defenders inside the sea anemone. These structures help to protect the animal from bad bacteria while allowing good bacteria to live and benefit the animal.

The study also found that a specific gene, cJun, plays a key role in controlling the function of nematosomes. When this gene was switched off using genetic scissors called CRISPR/Cas, the sea anemones were no longer able to distinguish between good and bad bacteria. This led to an imbalance in their microbiome and made them more susceptible to infections.

The researchers believe that this finding is important because it shows that even simple animals like sea anemones have sophisticated mechanisms for defending themselves against infections.

Why It Matters

This discovery can help us understand how the immune system evolved over time. It also raises questions about the capabilities of the innate immune system, which is the first line of defense against pathogens.

Key Facts

• Scientists from HHU and CAU studied the immune system of sea anemones.
• Sea anemones can selectively distinguish between good and bad bacteria using structures called nematosomes.
• The cJun gene plays a key role in controlling the function of nematosomes.
• Switching off the cJun gene made sea anemones more susceptible to infections.
• This study was published in Nature Communications.

Key Terms

Innate immune system

The first line of defense against pathogens that doesn't require specific antibodies.

Microbiome

The community of microorganisms living inside an animal or in a particular environment.

CRISPR/Cas

A tool used to edit genes by cutting them with genetic scissors.

Implications

This discovery can help us understand how the immune system evolved over time. It also raises questions about the capabilities of the innate immune system, which is the first line of defense against pathogens.