On what date was the Human Genome Project declared complete?

The Human Genome Project was declared complete on April 14, 2003. The announcement came about two years ahead of the project’s original 15-year schedule.

The project began officially in 1990 as an international effort led principally by the U.S. National Institutes of Health and Department of Energy, with major contributions from the United Kingdom, France, Germany, Japan, China, and other partners. Its central goal was to determine the sequence of the approximately three billion DNA base pairs in the human genome and create maps identifying genes and their locations.

The 2003 milestone represented a highly complete reference sequence, especially for the genome’s euchromatic regions. It did not mean that every base in every difficult, repetitive region had been resolved. Later projects filled additional gaps, including the first essentially complete gapless human genome sequence in 2022 and the full Y chromosome sequence in 2023.

The date is often confused with June 26, 2000, when leaders announced a working draft, or February 2001, when draft sequence papers were published. Those were major milestones, but not the project’s formal completion announcement.