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DNA map of Ireland reveals the Irish have Viking and Norman ancestry and are far more genetically diverse than previously thought
Researchers at Trinity College Dublin have constructed a DNA map revealing the lasting genetic contributions from British, Scandinavian and French invasions. The findings are significant because they could be used in future studies to identify the genetics underlying various traits and diseases in specific regions. The figure on the right shows a DNA cluster map of Britain and Ireland.
The researchers started with rich genetic data for about 1,000 Irish and 2,000 British individuals, and subdivided it into groups. They found 50 distinct genetic clusters (classified into broader groups) in Ireland and Britain as shown by the key on the left. Each group contains a majority of individuals from a particular region. Each cross on the plotted graph at the bottom represents an individual whose genes were sequenced for the study, and they are colour coded according to which cluster they belong to.
They are positioned based on where in the UK they are from, with the grey lines showing latitude (PC1) and longitude (PC4). The map top right shows how the groups are split around Britain and Ireland. Pictured left is an artistic rendering of Vikings on a ship. The Vikings left their genetic footprint in Ireland when they invaded the island, launching their first attack in 795 AD by raiding an island monastery.
Researchers have found 50 distinct genetic clusters (classified into broader groups) in Ireland and Britain as shown by the key, shown top left. They are separated by colour based on region.
For instance the SEE cluster, labelled in red and in South East England, represents a genetic group with largely Anglo Saxon Ancestry.
Groups with largely Celtic ancestry include NLU (shown in yellow) NSC (green) and NWA (pink).
Top right: A map shows how the groups are split around Britain and Ireland. Bottom: Each cross on the plotted graph represents an individual whose genes were sequenced for the study, and they are colour coded according to which cluster they belong to. They are positioned based on where in the UK they are from, with the grey lines showing latitude (PC1) and longitude (PC4)
Read more: http://www.dailymail.co.uk/sciencete...#ixzz55M8lCub6
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