“Celtic curse” hotspots found in Scotland and Ireland with 1 in 54 at risk
People with ancestry from the Outer Hebrides and northwest Ireland face a significantly elevated risk of developing hemochromatosis, a genetic disorder characterized by excessive iron absorption. This excess iron accumulates over time, potentially leading to serious health complications.
Mapping Genetic Risk for Hemochromatosis
For the first time, researchers have created a detailed map of genetic risk for hemochromatosis, often referred to as the ‘Celtic curse’, across the UK and Ireland. While the condition has long been known to disproportionately affect populations of Scottish and Irish descent, its precise geographic distribution remained unclear until now.
Significance of the Findings
Experts believe this new mapping will allow health officials to concentrate genetic screening efforts in the areas with the highest prevalence. This targeted approach could lead to earlier identification of at-risk individuals and prompt treatment, potentially preventing severe health consequences.
The Dangers of Iron Overload
Hemochromatosis typically develops gradually. Iron can build up in organs for years, even decades, before noticeable symptoms appear. If left untreated, the condition can result in liver damage, liver cancer, arthritis, and a range of other serious health problems. Early diagnosis is crucial, and a simple, effective treatment – regular blood donation – can significantly mitigate the harm.
Genetic Basis of the Disease
The disease stems from inherited genetic variations, or variants, in DNA. In the UK and Ireland, the C282Y variant is the primary genetic risk factor.
Regional Risk Levels
The highest rates of the C282Y variant were found among individuals with ancestry from northwest Ireland, where approximately one in 54 people are estimated to carry the variant. The Outer Hebrides closely followed, with a rate of one in 62, and Northern Ireland at one in 71. Elevated risk was also observed in mainland Scotland, particularly in Glasgow and southwest Scotland, where about one in 117 people carry the variant.
Diagnosis and Potential Underdetection
Analysis of NHS England records revealed over 70,000 diagnosed cases of hemochromatosis. White Irish individuals were nearly four times more likely to receive a diagnosis compared to white British individuals. Within England, individuals living in Liverpool were 11 times more likely to be diagnosed than those in Kent, a disparity researchers attribute to historical Irish migration patterns – over 20% of Liverpool’s population was Irish in 1850.
While diagnosis rates generally align with genetic risk patterns, areas like Birmingham, Cumbria, Northumberland, and Durham reported fewer cases than expected based on their genetic profiles. These regions may have a higher number of undiagnosed cases and could benefit from expanded screening initiatives. Comparable data from Scotland, Wales, and Northern Ireland were not available for this portion of the analysis.
Calls for Expanded Screening
Professor Jim Flett Wilson, Chair of Human Genetics at the University of Edinburgh, stated that early detection prevents most adverse outcomes and that a simple treatment – blood donation – is available. He believes the time is right to plan for community-wide genetic screening in high-risk areas to identify those at risk. Jonathan Jelley MBE JP, CEO of Haemochromatosis UK, emphasized the potential for this work to improve awareness, diagnosis, and treatment pathways.
Torcuil Crichton, a Member of Parliament for Na h-Eileanan an Iar (the Western Isles), who himself has hemochromatosis, supports the push for screening in his region. He believes the research provides a compelling case for a pilot screening programme, suggesting the Western Isles would be an ideal location due to its distinct population.
Frequently Asked Questions
What are the symptoms of hemochromatosis?
Hemochromatosis often develops slowly, and symptoms may not appear for years or even decades. If symptoms do develop, they can include fatigue, joint pain, and abdominal pain.
How is hemochromatosis treated?
Regular blood donation to lower iron levels is a simple and effective treatment.
Who is most at risk of developing hemochromatosis?
People with ancestry from the Outer Hebrides and northwest Ireland face the highest known risk. Specifically, about one in 54 people with ancestry from northwest Ireland are estimated to carry the C282Y variant.
Could increased genetic screening in high-risk areas lead to earlier diagnoses and improved health outcomes for individuals affected by hemochromatosis?