Yoshinori Ohsumi

Biography

Yoshinori Ohsumi was born on February 9, 1945, in Fukuoka, Japan. He went to Fukuoka Prefectural Fukuoka High School and later studied at the University of Tokyo, where he gained a strong foundation in biological sciences. He furthered his research at The Rockefeller University in New York, where he got exposed to advanced research in cell biology. He is married to Mariko Ōsumi, who has also contributed to biological research.

Ohsumi focused his scientific career on autophagy, a key cellular process where cells break down and recycle their own components. The term autophagy comes from Greek roots meaning self-eating. This process is crucial for cell maintenance, stress response, and development. Though autophagy had been noticed in basic form since the 1960s, its molecular workings were largely unknown for many years. Ohsumi aimed to uncover these mechanisms using baker's yeast, Saccharomyces cerevisiae, as a model to identify and understand the genes involved in autophagy.

In the early 1990s, Ohsumi published pivotal studies identifying autophagy-related genes, known as ATG genes, in yeast. He induced nutrient starvation in yeast cells that lacked the vacuolar enzymes needed to break down cellular material, which allowed him to observe the buildup of autophagosomes and identify mutants with defects in the process. This systematic approach led to finding more than a dozen essential autophagy genes, and follow-up work showed that these genes and their roles are widely conserved across eukaryotic organisms, including humans.

Ohsumi was a professor at the Institute of Innovative Research at the Institute of Science Tokyo's, where he continued to explore how autophagy works at the molecular level and how its disruption is linked to diseases like cancer, neurodegeneration, and infection. His work sparked widespread interest in autophagy research worldwide, with countless scientists studying its role in aging, immunity, and metabolic disorders.

For his contributions, Ohsumi received many prestigious awards. He won the Kyoto Prize in Basic Sciences in 2012 and the Asahi Prize in 2008. In 2015, he was honored with the Canada Gairdner International Award, the International Prize for Biology, the Rosenstiel Award, the Keio Medical Science Prize, and was named a Person of Cultural Merit in Japan. He was awarded the Order of Culture in 2016, the same year he received the Nobel Prize in Physiology or Medicine from the Nobel Assembly at Karolinska Institutet, for his discoveries of the mechanisms of autophagy. The 2017 Breakthrough Prize in Life Sciences followed, further solidifying his status as one of the most honored scientists of his time.