🇺🇸 영어 원문
Scientists have uncovered a previously unknown way that sea anemones defend themselves against viruses, revealing that the evolution of animal immune systems may be far more diverse than previously believed. The newly identified defense relies on a protein that closely resembles one of the most important antiviral proteins in humans, yet performs the opposite function while still being essential for protecting the animal from infection. The findings suggest that evolution produced more than one successful strategy for fighting viruses across the animal kingdom.
The research, led by PhD candidate Ton Sharoni and Prof. Yehu Moran at the Hebrew University of Jerusalem in collaboration with scientists from the University of North Carolina at Charlotte, was published in Nature Ecology & Evolution. It challenges the long-standing idea that animals inherited a single core antiviral system from a common ancestor and instead points to multiple evolutionary solutions for resisting viral infections.
Viruses have threatened living organisms throughout evolutionary history. In humans and other vertebrates, one of the body’s key antiviral defenses depends on a protein called MAVS. When a virus is detected, MAVS helps trigger the immune system so it can respond to the infection.
To investigate how old this defense system might be, the researchers studied sea anemones. These ancient marine animals split from the evolutionary line that eventually led to humans more than 600 million years ago. Because they are close relatives of corals and jellyfish, sea anemones provide scientists with a valuable glimpse into the early evolution of animal immunity.
During the study, the team discovered a previously unknown protein they named CARDIB (CARD Inhibitor Binding protein). At first, CARDIB looked remarkably similar to MAVS, leading researchers to believe it might perform the same antiviral role found in humans.
“Everything about CARDIB suggested it should function like MAVS,” said Prof. Yehu Moran, head of the Department of Ecology, Evolution and Behavior at the Hebrew University. “Instead, we discovered that it does the exact opposite. Rather than activating antiviral defenses, CARDIB normally suppresses them.”
The discovery immediately raised an important question. Why would an animal deliberately suppress its own immune response? To find out, the researchers used CRISPR gene editing to remove the CARDIB gene from sea anemones before exposing them to viruses.
The results were unexpected. Sea anemones without CARDIB became much more susceptible to infection. Viruses multiplied more rapidly, the animals failed to properly activate their antiviral defenses, and their ability to fight infection dropped dramatically.
“The results were completely counterintuitive,” said Sharoni. “Although CARDIB acts as a brake on the immune system under normal conditions, that brake turns out to be essential for mounting an effective antiviral response.”
Overall, the experiments showed that sea anemones rely on an antiviral pathway that is fundamentally different from the one used by humans, even though both systems contain molecular components that look strikingly alike. The researchers also wanted to determine whether this newly identified immune pathway mattered outside carefully controlled laboratory conditions. To answer that question, genetically modified sea anemones were moved from laboratory aquaria into outdoor marine environments to observe their survival rates in the wild.
🇰🇷 한국어 요약
안녕하세요, 여러분! 오늘은 해파리의 친척인 ‘해면동물 (Sea Anemone)’에 대한 아주 흥미로운 과학 뉴스를 가져왔어요. 과학자들이 해면동물이 바이러스와 싸우는 아주 독특한 방법을 발견했다고 합니다. 보통 우리 인간이나 동물은 바이러스를 발견하면 면역 시스템을 켜서 공격하죠. 하지만 해면동물은 조금 다릅니다. 그들은 CARDIB이라는 단백질을 사용하는데, 이 단백질은 평소에는 면역 반응을 ‘잠그는’ 역할을 해요. 신기하게도, 이 잠금장치가 있어야 오히려 바이러스에 잘 대항할 수 있다는 거예요. 마치 자동차의 브레이크가 있어야 안전하게 차를 조종할 수 있는 것과 비슷하죠. 이는 진화 과정에서 동물들이 바이러스를 막기 위해 여러 가지 다른 전략을 발전시켰다는 것을 보여줍니다. 과학자들은 실험실 밖 자연 환경에서도 이 면역 방식이 효과가 있는지 확인하기 위해 해면동물을 바다로 옮겨 실험하기도 했어요. 과학은 항상 놀라운 비밀을 품고 있죠!
🔑 핵심 단어 (Vocabulary)
- Defense – 방어, 보호 – Sea anemones defend themselves against viruses.
- Immune system – 면역 체계 – The findings suggest that evolution produced more than one successful strategy for the immune system.
- Protein – 단백질 – The newly identified defense relies on a protein.
- Evolution – 진화 – The evolution of animal immune systems may be far more diverse.
- Suppress – 억제하다, 누르다 – Rather than activating antiviral defenses, CARDIB normally suppresses them.
- Susceptible – 취약한, 감수성이 있는 – Sea anemones without CARDIB became much more susceptible to infection.
- Counterintuitive – 상식에 반하는, 직관에 어긋나는 – The results were completely counterintuitive.
- Pathway – 경로, 통로 – Sea anemones rely on an antiviral pathway that is fundamentally different.
- Components – 구성 요소 – Both systems contain molecular components that look strikingly alike.
- Laboratory – 실험실 – Outside carefully controlled laboratory conditions.
🔗 원문 링크
https://www.sciencedaily.com/releases/2026/06/260630020534.htm