1953｜The double-helix structure of DNA is described in Nature. Biology gains an elegant shape for heredity, but reading the information inside it remains painstaking work.
The Human Genome Project: Reading the Book of Life
1977｜Frederick Sanger and colleagues publish a practical chain-termination method for reading DNA. The technique will later be automated and scaled far beyond a single laboratory.
1988｜A U.S. National Academy of Sciences committee recommends a coordinated program to map and sequence the human genome. An audacious idea begins acquiring a plan.
April 1990｜The NIH and U.S. Department of Energy publish the first five-year plan for an expected fifteen-year effort: map the genome, read its letters, and improve the tools.
October 1, 1990｜The Human Genome Project officially begins. Its target is roughly three billion DNA letters — a biological text larger than any yet attempted.
1990｜Ethics enters the blueprint. The project establishes research on the ethical, legal, and social implications of genomic knowledge instead of leaving those questions until later.
Early 1990s｜Teams build genetic and physical maps before trying to read everything. The strategy is less like opening one book than locating millions of shuffled fragments first.
1993｜Francis Collins becomes the project's U.S. leader. Updated goals place technology, mapping, model organisms, and large-scale sequencing on one coordinated road.
1996｜At a meeting in Bermuda, project leaders agree that large-scale human sequence data should enter the public domain within twenty-four hours of generation.
The Bermuda principle｜Release first, publish later. A rule created for one immense project helps change expectations for sharing data across genomic science.
1997｜Volunteers are recruited to provide blood samples under informed consent. Donor identities are protected, and more samples are collected than will actually be used.
1998｜With earlier mapping goals met and sequencing technology accelerating, a new plan moves the expected finish from 2005 to 2003.
March 1999｜The pilot phase succeeds. The international consortium begins full-scale sequencing of the human genome across major centers in six countries.
December 1999｜Chromosome 22 becomes the first human chromosome reported as a finished sequence: 33.5 million letters and a glimpse of the larger task becoming possible.
March 2000｜The public project deposits its two-billionth DNA letter in GenBank. More than half of the draft's sequence has been produced in just the previous six months.
June 26, 2000｜The public consortium announces a working draft covering about 90 percent of the genome. Celera Genomics announces an independently assembled draft alongside it.
A draft, not an ending｜The first version still contains more than 150,000 gaps. It is a navigable map of a continent whose difficult terrain remains unfinished.
February 2001｜The public consortium publishes its draft sequence and initial analysis in Nature, giving researchers their first global view of the human genomic landscape.
The great surprise｜Humans appear to have far fewer protein-coding genes than many scientists expected. Complexity cannot be explained by gene count alone.
2002｜A draft mouse genome joins the growing library. Comparing species becomes one of the most powerful ways to discover what particular stretches of human DNA may do.
April 14, 2003｜The consortium declares the Human Genome Project complete, more than two years early and below its original spending projection.
The finished sequence｜It covers about 99 percent of gene-containing regions at 99.99 percent accuracy, reducing roughly 150,000 draft gaps to fewer than 400.
Whose genome?｜The reference is not one person's autobiography. It is a composite assembled from several anonymous donors, designed as a shared coordinate system for research.
October 2004｜The consortium publishes its scientific description of the finished sequence. Completing the reference turns out to be the start of interpretation, not its conclusion.
March 2022｜The Telomere-to-Telomere consortium fills the long-resistant gaps and reports the first truly complete human genome sequence, using technologies the original project lacked.
What it changed｜The project transformed sequencing, computation, international collaboration, open-data practice, and the search for genetic contributions to health and disease.
What it did not promise｜A genome is not a destiny or a complete instruction manual. Genes interact with one another, with cells, with environments, and with lives.
The lasting line｜Humanity's first reference sequence was not the final reading of the book of life. It was the moment the book became possible to study together.