molecular

For fish lovers, carpin (gibel carp) has historically been a culinary paradox: a meat appreciated for its tender texture and its rich protein profile, but a real challenge for the diner due to its more than 80 “Y”-shaped intermuscular spines (IBs). This inconvenience has caused countless incidents in cafeterias and visits to the emergency room, but now China has made a radical decision: rewrite the DNA of the species to adapt it to our needs. The “Zhongke No. 6”. The research team from the Chinese Academy of Sciences (CAS), led by academician Gui Jianfang, has announced success of the creation of a new variety called “Zhongke No. 6”. Unlike other scientific advances that remain in the laboratory, this specimen is a variety specifically designed to reach consumers’ tables and transform the aquaculture industry. Molecular surgery at the embryonic level. The key to success lies in a “surgical attack” on the fish’s genome. Scientists identified the gene runx2b as the “architect” responsible for giving the order to the fish’s body to develop those 80 pesky spines. Using CRISPR/Cas9 technology, described by researchers Like “molecular scissors,” they cut this specific genetic code during the embryonic stage. The process has proven to be of unprecedented precision. The main skeleton of the crucian carp – spine and ribs – develops completely normally, allowing the fish to grow, swim and stay healthy. However, the biological pathway that activates intramuscular spines, the ones that really get in the way of eating, do not develop. A six-year challenge: From the laboratory to production. Although the announcement of “Zhongke No. 6” is recent, the journey began years ago. According to the scientific journal Aquaculturethe seminal study that demonstrated the viability of these spineless mutants was originally published in early 2023. That initial work was the result of a six-year systematic effort under the CAS strategic program called “Design and Creation of Precision Seeds.” This project is especially complex because the crucian carp is hexaploid (it has six sets of chromosomes), which forced Gui Jianfang’s team to simultaneously edit all copies of the genes involved to ensure that not a single spine appeared in the new generations. More than an easy-to-eat fish. “Zhongke No. 6” has not only been emptied of thorns; has been optimized for industrial efficiency. According to published technical data, this variety presents accelerated growth since it reaches “commercial size” in less time than wild varieties. Additionally, it is designed to survive in dense, intensive aquaculture environments, where diseases often decimate production. Finally, it requires significantly less feed to produce the same amount of protein, reducing costs and the environmental impact of feed. The limit of the natural. However, this scientific advance places us before an uncomfortable mirror. As official sources conclude from the Chinese Academy of Sciences, this milestone represents a triumph of applied science that solves an ancient problem, transforming a difficult-to-eat fish into an efficient and safe source of protein. But, from a more critical perspective, an inevitable question arises: by optimizing every stroke of life for our comfort, what are we losing along the way? If we keep editing species so that they grow faster, are more resilient, and have no natural “defects,” we will reach a point where we won’t really know what we are eating. “Zhongke No. 6” is undoubtedly an engineering miracle, but it is also a reminder that the line between nature and the factory is increasingly thin. Image | Needpix Xataka | All the fish we eat are contaminated by methylmercury. But there are only four specific ones to avoid