A genetic disease known as the “Celtic Curse” has been highlighted as a concern due to its potential to cause cancer and other severe health issues if left untreated. Research has revealed that individuals from the Outer Hebrides and north-west Ireland face the highest risk of developing haemochromatosis, a condition characterized by excessive iron accumulation in the body, leading to complications such as liver cancer and arthritis.
In a groundbreaking study mapping the genetic predisposition for haemochromatosis in the UK and Ireland, scientists identified a significant incidence of the condition among Scottish and Irish populations. Targeted genetic screening in priority areas has been suggested as a strategy to detect at-risk individuals early on.
Haemochromatosis manifests symptoms gradually over decades as elevated iron levels damage organs. Timely diagnosis and intervention, such as regular blood donation to reduce iron levels, are crucial in preventing liver damage, liver cancer, and arthritis associated with the disease. The condition is linked to genetic variants that can be inherited within families, with the C282Y variant identified as a key risk factor in the UK and Ireland.
By analyzing genetic data from over 400,000 individuals in the UK BioBank and Viking Genes studies, researchers at the University of Edinburgh determined the prevalence of the C282Y variant across 29 regions of the British Isles and Ireland. Their findings, published in Nature Communications, indicated that individuals with roots in the north-west of Ireland have the highest risk of haemochromatosis, with one in 54 estimated to carry the genetic variant.
Following this region, Outer Hebrideans (one in 62) and individuals from Northern Ireland (one in 71) were also identified as high-risk groups. Mainland Scots, particularly in Glasgow and south-west Scotland, exhibited an increased susceptibility to the condition, with one in 117 estimated to carry the variant, aligning with the “Celtic Curse” moniker attributed by researchers.
The research team proposed that concentrating genetic screening efforts in these high-risk areas could lead to the identification of a significant number of individuals with haemochromatosis. Notably, an analysis of haemochromatosis diagnoses in NHS England revealed over 70,000 cases, with a notably higher diagnosis rate among white Irish individuals compared to white English individuals, possibly influenced by historical immigration patterns.
While the prevalence of haemochromatosis in England corresponds largely with genetic risk patterns, certain regions like Birmingham, Cumbria, Northumberland, and Durham showed lower than expected diagnosis rates, indicating potential under-diagnosis. The researchers recommended genetic screening to uncover additional cases in these areas.
Due to the unavailability of haemochromatosis prevalence data from Scotland, Wales, and Northern Ireland, the study did not encompass these regions. Prominent figures in the field, including Professor Jim Flett Wilson and Jonathan Jelley, emphasized the importance of early detection through community-wide genetic screening to mitigate the adverse consequences of haemochromatosis and improve treatment outcomes for affected individuals. Moreover, calls for a pilot screening program in hotspots like the Western Isles have gained support from advocates like Torcuil Crichton, a Labour MP and haemochromatosis patient, who stresses the potential benefits of early identification in averting severe health outcomes.
The study, funded by Haemochromatosis UK, holds promise for enhancing awareness, diagnosis rates, and treatment pathways for individuals impacted by genetic haemochromatosis. Efforts are underway to prioritize support in hotspot areas across the UK, aiming to address the overlooked but preventable nature of the condition through targeted interventions.
