600-million-year-old secret of the human body may lie inside this brainless ocean creature

The ocean still hides many secrets, and sometimes the smallest or simplest creatures reveal the biggest clues about life. Scientists have long believed that complex animals such as humans evolved through a gradual process that shaped our bodies over hundreds of millions of years. Yet the exact moment when the blueprint for building a human-like body first appeared remains a mystery. The study suggests that part of that blueprint might already exist in a creature that looks nothing like us, the sea anemone. These soft marine animals live attached to rocks on the seafloor and lack even a brain. Despite that simplicity, researchers say they appear to use a developmental mechanism that resembles the one humans use during early growth. If the finding holds, it might push the origins of our body plan far deeper into evolutionary history than previously thought.Sea anemones do not exactly look like distant relatives of humans.As reported by ScienceDaily research, titled, '600-million-year-old body blueprint found in sea anemones', they belong to a group of animals called cnidarians, which includes jellyfish and corals. These creatures usually have bodies arranged around a central point. Imagine a circular structure with tentacles spreading outward. Humans are very different. We belong to a large group of animals known as bilaterians. These animals have clear left and right sides, along with a front and back. Our two arms, two legs, and two eyes reflect that pattern.For years, biologists treated these two groups as very separate branches of the animal kingdom. Scientists from the University of Vienna recently found evidence suggesting that sea anemones use a developmental trick that closely resembles one used by bilaterian animals.Building a body inside an embryo is not random. Cells need instructions telling them where they are and what they should become. This is where molecules known as bone morphogenetic proteins, or BMPs, enter the picture, playing a crucial role in shaping tissues and organs during early development.BMPs act like tiny messengers. They send signals that guide developing cells and help determine what type of tissue those cells should form. Skin, organs, and parts of the nervous system all rely on these instructions for proper growth and organisation.In simple terms, the strength of BMP signals changes across the developing body. Lower levels can help form the central nervous system. Moderate levels may contribute to organs such as the kidneys. Higher levels influence the formation of outer tissues, including bones, muscles, and skin structures.The Vienna research team focused on another molecule called Chordin. Chordin acts as a kind of regulator for BMP signals. It can block them in certain areas while transporting them to others. Scientists sometimes describe this movement as “BMP shuttling.” This shuttling process helps create the gradient that shapes the body during development. Interestingly, the mechanism appears in animals that are not closely related. Frogs use it. Flies do too. Fish, oddly enough, do not seem to rely on it in the same way.Because it appears across very distant species, some scientists suspect that BMP shuttling may be extremely ancient. The surprising part is that sea anemones appear to use a similar system. Researchers observed that Chordin in sea anemones can move BMP signals in a way that helps shape their body axis. That discovery suggests the mechanism might predate the evolutionary split between cnidarians and bilaterians.