A recent study published in the journal Science Advances explores how gravity affects the human genome by simulating conditions of microgravity, the near-weightlessness experienced in space. Led by Alexandra Zidovska, an associate professor of physics at New York University, the research aimed to understand whether gravity influences the structure and function of the genome both on Earth and in space. To achieve this, the team used a specially designed machine that rotated human cells in a way that mimicked the absence of gravity, allowing them to observe any changes in the cells under these conditions. The human genome is organized in a complex, layered structure, and this organization is crucial for the proper functioning of genes. When this structure is disrupted, it can lead to diseases such as cancer and developmental disorders. The researchers wanted to know if the absence of gravity in space could cause such disruptions. To simulate microgravity, they created a custom lab device that rotated cells along two axes, minimizing fluid movement that typically occurs during rotation. This helped reduce the formation of cell clusters, which could otherwise interfere with the study's results. The study compared cells exposed to simulated microgravity with those exposed to strong fluid flows and those not exposed to either. After 24 hours, the researchers used advanced imaging techniques to examine changes in cell shape, size, nuclear structure, and the organization of the genome. Their findings showed that exposure to fluid flows caused cells to become elongated, but simulated microgravity had no such effect. The nucleus of cells exposed to zero gravity grew in size, suggesting that gravity normally helps regulate its volume. However, the nuclear envelope and genome structure remained largely unchanged, indicating that gravity has little impact on these features. The researchers also found that the genome’s organization and movement within the nucleus remained stable after 24 hours of simulated microgravity, and no DNA damage was observed. However, when cells were exposed to strong fluid flows, DNA damage did occur. The nucleolus, a structure within the nucleus involved in protein production, appeared smoother after exposure to both simulated microgravity and fluid flows. While the study found no immediate changes in the genome’s structure or function under simulated microgravity, the researchers caution that such effects could accumulate over time and potentially impact cell health. They suggest that during short space missions, the genome's organization may remain largely unchanged, but prolonged exposure to space conditions or the occurrence of DNA damage could lead to more significant effects. The research team included several other scientists from New York University, including doctoral and undergraduate students, as well as a professor from the Courant Institute of Mathematical Sciences.