Who is credited with the first isolation of DNA in 1869?

Who is credited with the first isolation of DNA in 1869? Friedrich Miescher is credited with the discovery. Working in Felix Hoppe-Seyler’s laboratory in Tübingen, Miescher isolated a phosphorus-rich substance from the nuclei of white blood cells.

Miescher called the substance “nuclein” because it came from cell nuclei. He obtained the cells from pus on discarded surgical bandages, then used chemical treatments to separate nuclear material. The substance was later understood to be nucleic acid, including DNA.

The discovery did not immediately reveal DNA’s role in heredity. Miescher’s work was published in 1871 after Hoppe-Seyler repeated the experiments, reflecting the cautious standards of the laboratory. Other scientists, including Albrecht Kossel, later helped investigate nucleic acid chemistry.

A common mistake is crediting Watson and Crick, who described DNA’s double-helix structure in 1953, or Erwin Chargaff, whose base-ratio findings helped establish pairing rules. Miescher’s achievement came much earlier: he isolated the material itself, decades before its biological function was understood.