Rob Williams, PhD, Professor and Chair of the Department of Genetics, Genomics, and Informatics at the University of Tennessee Health Science Center, is the lead author of a groundbreaking Nature study titled "Dynamics of Genetic and Somatic Trade-offs in Ageing and Mortality." The research introduces a new perspective on longevity by identifying genetic regions that influence mortality risk at different stages of life rather than viewing lifespan as a single outcome.

Traditionally, longevity studies have focused on overall lifespan. In contrast, Dr. Williams and his team analyzed mortality risk across specific age ranges, including 50–60, 60–70, and 70–80 years. Their findings reveal that different sets of genes influence mortality at different ages, suggesting that aging is regulated by multiple genetic programs that become active throughout life.

The researchers identified 29 genetic regions, known as VITA loci, that affect mortality risk during specific life stages. These genetic regions may serve as promising targets for future interventions aimed at extending healthy lifespan.

Another major discovery is that the genetic mechanisms underlying aging differ substantially between males and females. The VITA loci associated with mortality risk are largely distinct in each sex, highlighting the importance of considering biological sex when developing therapies for age-related diseases.

The study suggests that future longevity interventions could be personalized based on an individual's genetic profile, biological sex, and stage of life, rather than using a one-size-fits-all approach. The ultimate goal is to improve healthspan by extending the years of healthy, functional living while reducing the period of illness and disability later in life.

The research also highlights the importance of maintaining body weight in older age. While excess body weight may negatively affect younger individuals, the findings indicate that preserving body mass in later life can be protective, whereas unintentional weight loss may signal declining health.

The study is based on data from the National Institute on Aging's Interventions Testing Program, which has monitored approximately 25,000 mice from birth to death. So far, the research team has analyzed around 7,200 DNA samples, with additional analyses underway to further strengthen these findings.

Supported by the State of Tennessee through the Center for Integrative Translational Genomics and the UT–Oak Ridge Innovation Institute Governor's Chair, the project brings together experts in genetics, statistics, computer science, and evolutionary biology to advance the understanding of aging and personalized longevity medicine.

Source: https://news.uthsc.edu/landmark-aging-study-by-ut-health-sciences-researcher-published-in-nature/