April 25 is DNA Day in the USA. Although this holiday was declared as one-time observance, it is still celebrated annually.
DNA Day commemorated the day when James Watson, Francis Crick, Maurice Wilkins, Rosalind Franklin published papers in journal Nature on the structure of DNA in 1953. Furthermore, on the very same day, only in 2003, the Human Genome Project was declared very close to complete. Although the analysis of some genome parts is still not complete even after more than 60 years of studying, the major work is done.
The holiday was celebrated for the first time in 2003 and it was proclaimed by both the Senate and the House of Representatives. The holiday was declared a one-time celebration, not an annual one. However, every year onward annual DNA Day celebration is organized by the National Human Genome Research Institute, but the holiday fell on different dates (April 23, April 20 and April 15).
And several groups declared April 25 as International DNA Day and World DNA Day.