Human Genome Project
International consortium publishes its draft human-genome sequence in Nature
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Original prompt & settings (JSON) ↗The headline result was not a newly discovered gene but how few genes researchers thought they saw: roughly 30,000–35,000, far below many earlier expectations.
February 2001: the draft meets peer review
The International Human Genome Sequencing Consortium's paper 'Initial sequencing and analysis of the human genome' appeared in the 15 February 2001 issue of Nature, reporting a freely available draft covering more than 90 percent of the human genome — with 2.91 billion base pairs of euchromatic consensus sequence — and its first genome-wide analysis.
The dates around the milestone are easily conflated: the working draft itself had been assembled and announced in June 2000, UCSC put an assembly online that July, NHGRI announced the published analysis on 12 February 2001, and Nature's webpage also lists a 1 February online date. The paper, not the draft, is what February 2001 contributed.
The unexpectedly low gene estimate
The analysis sharply cut the contemporary estimate of human gene count to approximately 30,000–35,000 — far below many earlier expectations. Behind it stood hundreds of researchers at 20 centers in six countries, and one graduate student's sprint: Jim Kent wrote the roughly 10,000-line GigAssembler program in about four weeks to help assemble the public working draft.
Demand was already enormous before the paper landed — UCSC reports half a trillion bytes of the draft downloaded in its first 24 hours online.
Not the only genome in town
Celera Genomics published a separate draft and analysis in Science at approximately the same time — so this was a milestone shared between two rival efforts, the public consortium's clone-based approach and Celera's whole-genome shotgun.
And 'the human genome' here meant a mosaic reference assembled from anonymous donors, not one person's complete genome — with the underlying public sequence remaining freely accessible without use restrictions.
Sources
Researched 23 Aug 2026 5 sources 3 audit passes Date corrected
How this was checked
Researched from the web into a fact sheet, rewritten from that sheet, then audited against it by a different model. How the pipeline works →
Date corrected. The research places this at 2001-02-15.
What the sources leave uncertain
- Several related milestones are easily conflated: the first working assembly was completed and announced in June 2000, UCSC released an assembly online in July 2000, NHGRI announced the published analysis on 12 February 2001, and the Nature issue is dated 15 February. Nature's current webpage also displays an online publication date of 1 February 2001.