A $80 million grant from the National Institute on Aging of the National Institutes of Health (NIH) will allow researchers at Washington University School of Medicine in St. Louis to continue their groundbreaking work into the genetics of exceptional longevity. The funding renews support for the Long Life Family Study, a decades-long investigation seeking to understand why some families consistently live longer, healthier lives than others.
The study, launched in 2004, focuses on families with an unusually high number of members who live to 90 and beyond, with some reaching 100 years or more. Researchers hope that by identifying the genetic factors that contribute to this extended lifespan, they can unlock new strategies for preventing age-related diseases and improving overall healthspan – the period of life spent in good health.
As populations worldwide age, the need to understand and address the challenges of aging is becoming increasingly urgent. Studies estimate that the number of people over age 50 with at least one chronic condition, such as cardiovascular disease, diabetes, or Alzheimer’s disease, could double by 2050. Understanding the mechanisms behind exceptional longevity could offer crucial insights into delaying or preventing these conditions.
Unraveling the Secrets of Long Life
Washington University School of Medicine has a long history of leadership in genetics and genomics, notably as one of the largest contributors to the Human Genome Project. This expertise is central to the Long Life Family Study, which analyzes the complete genetic makeup – the genome – of participants to identify variations associated with longevity. The study has already enrolled more than 5,000 individuals from over 530 families across the U.S. And Denmark, providing a rich dataset for analysis.
Initial findings from the study have revealed that long-lived families tend to exhibit better cardiovascular health than the general population, including healthier blood pressure levels and lower rates of type 2 diabetes. However, researchers emphasize that the picture is complex. “So much of medical research is focused on genetic problems that cause disease, and importantly so – we have learned a tremendous amount from that strategy,” explained Michael A. Province, PhD, the study’s principal investigator and a professor in the Department of Genetics at WashU Medicine. “But I am also fascinated by the opposite question: are there genetic variants that cause good things to happen in the body? Our study suggests that there is a wide variety of genetic ways that these long-lived families could be protected from chronic diseases as they age.”
A Multi-Generational Approach
The Long Life Family Study’s design, which follows multiple generations of families, is a key strength. By comparing the genetic profiles and health outcomes of grandparents, parents, and children, researchers can pinpoint inherited variations that may protect against age-related diseases. This approach is similar to the well-known Framingham Heart Study, which has tracked families in Framingham, Massachusetts, since 1948, but with a specific focus on exceptional longevity.
Over the past five years, researchers have observed that long-lived families don’t all experience good health in the same way. Some families demonstrate exceptional cognitive function, while others have particularly robust lung capacity or grip strength. In general, however, these families tend to have lower rates of diabetes. Analysis has identified a genetic variant associated with lower hemoglobin A1c, a measure of average blood sugar levels used to diagnose diabetes.
Despite this, researchers have also uncovered intriguing paradoxes. For example, obesity rates are similar in long-lived families and those participating in the Framingham Heart Study, yet the long-lived families have roughly half the incidence of diabetes. “Something is protecting them from diseases associated with obesity,” Province said, “and we’d love to find out what that is.”
New Technologies, Expanded Scope
The study is now leveraging advancements in genomic sequencing technology. A re-analysis of all existing participant genomes, using “long-read” sequencing, will allow researchers to examine previously inaccessible portions of the genome – often referred to as the “dark matter” – potentially revealing additional genetic clues. This new analysis will expand the study to include a total of 7,800 individuals.
Researchers are also actively recruiting new families, particularly those with very long-lived older generations, and are prioritizing the inclusion of families of African ancestry to increase the diversity of the dataset. “The larger and more diverse our dataset, the better we will be able to identify inherited genetic variants associated with longevity and then distinguish which are causing the protective effects and which are just inherited and ‘along for the ride,’ so to speak,” Province explained.
The Long Life Family Study collaborates with researchers at institutions including Boston University, Columbia University, the University of Pittsburgh, and the University of Southern Denmark.
The research team also identified a genetic variant linked to both extreme longevity and lower blood pressure, but surprisingly, also a slightly increased risk of head and neck cancer. Researchers caution that this finding highlights the need for careful consideration when developing therapies targeting specific genetic variants, as they may have both beneficial and detrimental effects.
The next phase of the Long Life Family Study will focus on analyzing the newly sequenced genomes and expanding the participant pool, with a particular emphasis on increasing diversity. Researchers anticipate that these efforts will yield further insights into the complex interplay between genetics, lifestyle, and longevity.
Disclaimer: This article provides information for general knowledge and informational purposes only, and does not constitute medical advice. We see essential to consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
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