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How did Friedrich Miescher contribute to the study of inheritance?

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Artist's illustration of human nerve cells showing a central neuron with a green nucleus, branching dendrites, and glowing signals traveling along axons against a dark background. — cell Artist's conception of a human neuron.

In 1869, Swiss chemist Friedrich Miescher made a foundational contribution to the study of inheritance by discovering a substance he named "nuclein" within the nuclei of white blood cells.12

While Miescher did not identify this substance as the agent of heredity himself, his discovery provided the essential chemical basis for later breakthroughs. The substance he isolated, which contained both nitrogen and phosphorus, is now known as deoxyribonucleic acid (DNA).21

For many years following his discovery, the scientific community largely favored proteins as the primary carriers of genetic information due to their greater structural diversity. It was not until the mid-20th century—through the work of researchers such as Oswald T. Avery, Alfred D. Hershey, and Martha Chase—that DNA was firmly established as the hereditary material. Miescher’s initial isolation of this molecule remains a pivotal moment in the history of cell biology and molecular genetics.21