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The researchers from the University of Aberdeen found there are more than 160 adults living in Grampian, Highland, Orkney, Shetland, and the Western Isles who have the gene but have not been tested.

The research was led by Prof Zosia Miedzybrodzka of the University of Aberdeen and clinical lead for Huntington's disease at NHS Grampian, alongside Heather Cruickshank, genetic counsellor at NHS Grampian.

The affected areas include the northern parts of the Highlands, Grampian, Fife and the east coast stretching down to the Borders.

The scientists worked in collaboration with NHS Grampian on the study.

Dr Gerald Lip is a consultant radiologist in NHS Grampian and co-investigator in the study, who has recently been appointed president of the British Society of Breast Radiology.