Scientists from the Conway Institute at University College Dublin have uncovered the first Irish genetic code.
Researchers used advanced sequencing technology to carry out the landmark study which took a year and cost €30,000.
It now provides the first complete genetic picture of the Irish branch of the European ancestral tree and could provide answers as to why we are more susceptible to certain diseases like cystic fibrosis.
The DNA from an Irish man with a confirmed Irish ancestary spanning three generations was used - he also had a variation that was typically Irish.
Scientists have already made one discovery - a variation in the sequence that disrupts a gene associated with inflamatory bowel disease.