Flinders University Researchers Pinpoint Genetic Cause of Juvenile Glaucoma in Study

A major international study has confirmed the role of a specific gene duplication in juvenile open-angle glaucoma, paving the way for routine genetic screening in at-risk families.

Australian researchers have made a significant breakthrough in understanding the genetic underpinnings of juvenile glaucoma, with findings that could reshape how eyecare clinicians screen and manage younger patients and their families.

The study, led by Flinders University and published in JAMA Ophthalmology, has identified FOXC1 duplication as a confirmed genetic contributor to juvenile open-angle glaucoma (JOAG).

The research was spearheaded by Professor Jamie Craig, Dr Emmanuelle Souzeau, and PhD candidate and genetic counsellor Giorgina Maxwell from the Flinders Health and Medical Research Institute (FHMRI) Eye and Vision group.

A Condition Flying Under the Radar

JOAG is a form of early-onset primary glaucoma affecting individuals under the age of 40. While glaucoma is widely understood as a disease of older adults, many clinicians and patients remain unaware of its potential impact on younger populations.

Glaucoma affects an estimated 80 million people globally, including approximately 300,000 Australians many of whom are undiagnosed. Historically, detecting early-stage disease has presented a clinical challenge, and predicting which patients will progress to severe vision loss has remained elusive.

What the Research Found

Prior to this study, the prevalence of FOXC1 duplication in JOAG had not been assessed across large patient cohorts. The research team analysed data from 594 JOAG patients drawn from two major genetic databases, Massachusetts Eye and Ear in the United States and the Australia and New Zealand Registry of Advanced Glaucoma (ANZRAG), identifying 20 individuals across 10 families carrying the FOXC1 duplication.

"Across these two large databases, this specific genetic duplication appeared frequently, confirming its connection to this condition, which is often difficult to diagnose," said Matthew Flinders Distinguished Professor Craig.

Clinical Implications for Practice

For eyecare professionals, the findings have clear and immediate relevance. The researchers are calling for FOXC1 duplication to be incorporated into routine genetic testing protocols, particularly where a family history of juvenile glaucoma is present.

"This study highlights the potential for routine testing of FOXC1 duplication as part of the genetic testing process, particularly in families with a history of this form of juvenile glaucoma," said lead author Mrs Maxwell.

The hereditary implications are significant: if a patient is found to carry the extra copy of FOXC1, their first-degree relatives, parents, siblings, and children, have up to a 50% chance of also carrying it. Identifying at-risk family members allows for earlier monitoring and treatment, helping to prevent vision loss.

Dr Souzeau, who conducts screening for the ANZRAG database at Flinders University, reinforced the urgency of genetic identification. "Juvenile glaucoma is often underdiagnosed. Identifying the genetic cause in these families is critical for diagnosis and prevention," she said.

Early Intervention Remains Key

Professor Craig stressed that glaucoma's asymptomatic nature makes proactive detection all the more critical for clinicians. "Glaucoma is a serious disease with devastating consequences and no detectable early symptoms. Fortunately, glaucoma is a treatable condition if discovered early. Eye drops, laser and surgery are all effective interventions that can stabilise, slow or prevent disease progression," he said.

The study was supported by funding from the National Institutes of Health, a NHMRC Program grant, and the Snow Medical Research Foundation.

(image credit: Flinders University)