How gravity affects the human genome

Scientists have recently discovered that gravity significantly influences the human genome, particularly in outer space. The Human Genome Project, launched in 1990, aimed to sequence the entire human genome, but many questions about its organization and function remained unanswered. One such question is the impact of gravity, a constant force on Earth, on the genome's organization and function.

To investigate this, a team of researchers at New York University (NYU) designed a zero-gravity or microgravity environment using a custom laboratory device called a random positioning machine. This machine rotates dishes of live cells in a 3D rotational path, simulating weightlessness in outer space. The researchers also developed new algorithms to minimize fluid flows and cell aggregates that could obscure the effects of simulated microgravity.

The study found that exposure to simulated microgravity had minimal impact on the genome's organization and dynamics within the cell nucleus. The cell's shape remained unchanged, and the volume of the nucleus slightly increased, but the nuclear envelope's thickness and structure remained unaffected. The genome itself retained its physiological organization and motions after 24 hours of simulated microgravity exposure.

Moreover, the researchers discovered that DNA damage occurred only when cells were exposed to flows, not to simulated microgravity. While the genome's structure remained stable after 24 hours of simulated microgravity, these subtle changes could potentially accumulate over time, affecting cell physiology. The findings suggest that the human genome may be resilient to short-term exposure to microgravity, which is similar to the conditions astronauts experience during space travel.

However, longer exposures and potential DNA damage in space could lead to more significant changes in the genome's organization.