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McMaster University researchers identify novel DNA region and two genes linked to frailty in older adults

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New Genetic Clues to Frailty Discovered in Major Study

Researchers at McMaster University have identified a previously unknown region of DNA associated with frailty in older adults. The findings, published on April 22, 2026, in the journal npj Aging, offer new insights into the biology of this common and serious condition.

The study linked two specific genes in this newly identified region—PLXNC1 and SOCS2—to frailty, suggesting important roles for both the brain and immune systems in its development.

Key Findings at a Glance

  • Discovery: A previously unknown region on chromosome 12 linked to frailty.
  • Key Genes: Two implicated genes are PLXNC1 (involved in brain and nerve function) and SOCS2 (involved in immune system regulation).
  • Scope: One of the largest frailty genome-wide association studies (GWAS) completed in Canada, and the first to identify this specific genomic region.
  • Data Source: Analysis of over 8 million genetic variants from more than 23,000 participants in the Canadian Longitudinal Study on Aging (CLSA).
  • Frailty Measurement: Clinically validated characteristics including grip strength, walking speed, exhaustion, weight loss, and physical activity.

Understanding the Significance

Frailty is a major public health concern, associated with an increased risk of falls, disability, hospitalization, and early death. Despite its impact, the underlying biological mechanisms have remained poorly understood.

This research provides crucial new biological clues into why frailty develops. By pinpointing specific genes, scientists can begin to unravel the pathways that lead to the condition.

Sayem Borhan, the study's lead author, emphasized the potential impact: "Understanding how the immune and brain systems influence frailty could lead to earlier screening and more personalized approaches to healthy aging."

Parminder Raina, the study's last author, highlighted the broader context: "Knowledge of the underlying biological mechanisms of aging is essential for addressing the challenges of a rapidly aging global population."

The Path Forward

The research team has outlined clear next steps to build on this discovery:

  • Validation: Plans to confirm the genetic findings in more diverse populations.
  • Mechanism: Future work will investigate how the identified genes influence inflammation and brain function over time.
  • Application: Exploration of whether these biological pathways can be targeted to prevent or delay frailty.

Ultimately, the team hopes this work will support the development of early-screening tools to identify individuals at higher risk for frailty, allowing for timely interventions.

Note: This study was conducted without external funding.