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Genetic Condition Haemochromatosis Linked To Higher Levels Of Disease In Older People

A largescale new study has found that some people whose genetics are linked to the common iron overload condition haemochromatosis have substantially greater levels of liver, musculoskeletal and brain disease than previously reported, especially at older ages.

Haemochromatosis causes a build-up of iron in the body which can cause harm to joints and organs -- although the extent of this harm is unclear, especially in older ages. The new research, led by a team at the University of Exeter and supported by the National Institute for Health and Care Research (NIHR) Exeter Biomedical Research Centre, found higher levels of disease plus greater mortality in males, especially after age 65.

Published in BMJ Open, the research analysed data from more than 450,000 European Ancestry participants in UK Biobank, over a 13 year follow-up, making it the largest-scale study to look at disease outcomes linked to haemochromatosis. For the first time, the team provided data on clinical outcomes up to the age of 80 years on people who carry genes linked to haemochromatosis, providing insight into how the condition affects older age groups, including those who were undiagnosed at baseline.

Dr Janice Atkins, Senior Research Fellow at the University of Exeter and study co-author, said: "Haemochromatosis is the most common genetic disorder in people of Northern European ancestry, yet we are still learning the extent to which it causes harm. Our study is the most comprehensive to date and reveals higher levels of death and organ and joint damage than previously known, including liver disease and joint replacements."

In UK Biobank, 2,902 people (0.6 % of participants) had two copies of the genetic variant (C282Y) which mean they are at risk of the condition. Of these people, who had a mean age of 57, only a small proportion were diagnosed with haemochromatosis at the start of the study- 12% of males and 3.4% of females.

By the times males with the two genetic variants had reached the age of 80, the study found that 33.1% had died, compared to 25.4% without thevariants. The study also found that 27.9% vs 17.1% had joint replacements, 20.3% vs 8.3% had liver disease, and there was higher delirium, non Alzheimer's dementia, and Parkinson's disease in those with the two gene variants.

In females by age 80, those with both genetic variants had higher levels of liver disease (8.9% vs 6.8%), joint replacements and delirium.

Haemochromatosis is more common in males, and particularly affects white people of Northern European ancestry. An estimated 175,000 men of European ancestry in the UK have the two gene variations that cause haemochromatosis. The disorder is known as the "Celtic curse" because it is particularly prevalent in Celtic bloodlines.

Reliable tests are available to identify those at risk -- blood tests for measuring iron levels and genetic testing. Symptoms can include feeling tired all the time, muscle weakness and joint pains, meaning it is often misdiagnosed as the usual signs of ageing. Once diagnosed, the condition is easily treated by a process similar to donating blood several times a year, to lower iron levels. The blood can be donated to the NHS transfusion service once iron levels have reduced enough.

Professor David Melzer, who leads the research team, said: "These findings highlight the need for earlier diagnosis of iron overload, as many people with the high risk genetic variants are currently diagnosed too late to prevent organ damage. The condition can be picked up with a simple blood iron test, and it is encouraging that more and more GPs are aware of the need to test for iron overload. The research results also contained very good news for people with the milder genetic variants (called C282Y/H63D and H63D homozygotes), with no excess of fatigue, liver fibrosis, diabetes or arthritis, adding to the evidence that these variants are benign. Of course, some people with these variants will unfortunately have fatigue, liver fibrosis, arthritis or diabetes, but this happens at the same rate as people without these gene variants and underlines the need to investigate the other causes of these conditions too."

Study co-author Dr Jeremy Shearman, Consultant Hepatologist and Gastroenterologist at South Warwickshire University NHS Foundation Trust, said: "This important data supports the long-held belief that we should be using targeted genetic testing more consistently to make an earlier and more accurate diagnosis of haemochromatosis. It is a common condition here in the UK and can be easily treated to avoid serious harm."

Information Evening On Haemochromatosis Or 'iron Overload' To Take Place In Tralee Tomorrow

A poster for the upcoming event on Tuesday evening.

Fergus Dennehy

© Kerryman Mon 4 Mar 2024 at 14:07

The Irish Haemochromatosis Association is organising a free patient information evening with Dr. John Casey, for patients, family members and members of the public who are interested in finding out more about haemochromatosis.

The event will take place on Tuesday March 5 2024 from 7pm at The Rose Hotel, Tralee.

This is a free, in-person meeting and everyone is welcome to attend.

Dr. John Casey is a GP and Assistant Programme Director for the South West General Practice Training Scheme in Tralee's Munster Technological University. He has extensive knowledge and experience in diagnosing and treating haemochromatosis patients and his presentation will include practical information on what are the symptoms of haemochromatosis, how to get tested and diagnosed and what is the treatment.

There will be a Q & A session where people will get opportunities to ask lots of questions on the night.

Haemochromatosis is more common in Ireland than anywhere else in the world, as one in five people carry one copy of the gene and one in every 83 Irish people carry two copies of the gene, predisposing them to develop iron overload. Haemochromatosis, also known as 'iron overload', is Ireland's most common genetic disorder.

Early diagnosis is vital and if left untreated, can lead to organ damage or even premature death. The Irish Haemochromatosis Association estimates there are at least 20,000 undiagnosed cases of Haemochromatosis in Ireland. Some of the symptoms of haemochromatosis can range from chronic tiredness and joint pain, to abdominal pain and sexual dysfunction.

For more information, email miriam@haemochromatosis.Ie

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