Tomoko Ohta

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Tomoko Ohta (太田 朋子 Ōta Tomoko?, born September 7, 1933, Miyoshi, Aichi) is a Japanese scientist working on population genetics/molecular evolution. She graduated from the Agriculture Department of the University of Tokyo in 1956. She worked at an editorial publishing company before she was hired at the Kihara Biological Institute. There, her work focused on the cytogenetics of wheat and sugar beet. In 1962 an opportunity provided by Hitoshi Kihara to study abroad in the U.S. became available. While a graduate student at the Graduate School of North Carolina State University, she switched her graduate study focus from plant cytogenetics to population genetics with the help of her advisor, Ken-Ichi Kojima, whom she eventually became a student of. She assisted Kojima in working on problems in stochastic population genetics. She obtained her Ph.D. from North Carolina State University in 1966. Because she had studied abroad as a Fulbright student, she was only able to stay in the United States to finish her PhD. Returning to Japan, she worked under Motoo Kimura, whom was the only theoretical population geneticist in Japan at the time.[1] After working on the neutral theory of evolution with her mentor Kimura, she became convinced that nearly neutral mutations (neither deleterious nor entirely neutral) played an important role in evolution.[2] She developed the slightly deleterious model (Ohta, 1973), then a more general form, the nearly neutral theory of evolution.[3] She worked at the Japanese National Institute of Genetics from 1969 to 1996,[4] and, in 2002, she was elected to the United States National Academy of Sciences as a foreign associate in evolutionary biology.

Ohta and Richard Lewontin were jointly awarded the Crafoord Prize for 2015 "for their pioneering analyses and fundamental contributions to the understanding of genetic polymorphism".

Reactions to Ohta's Nearly Neutral Theory[edit]

When Ohta first published her Nearly Neutral theory, she faced difficulty in attracting the scientific research community's attention. Many researchers at the time strongly supported the natural selection theory.[2] Supporting data in protein evolution was sequentially collected in the 1990s, with even more evidence supporting her theory made available throughout the 21st century.[1]


List of books available in English[edit]

  • Theoretical aspects of population genetics, Motoo Kimura and Tomoko Ohta (1971)
  • Evolution and variation of multigene families, Tomoko Ohta (1980)
  • Population genetics and molecular evolution: papers marking the sixtieth birthday of Motoo Kimura, edited by Tomoko Ohta and Kenichi Aoki (1985)
  • Tomoko Ohta and the Nearly Neutral Theories: The role of a female geneticist in the neutralist-selectionist controversy, Tomoko Y. Steen (1996) Ph.D. Dissertation. (CORNELL UNIVERSITY)[2]


  1. ^ a b Ohta, Tomoko, Tomoko Ohta, 22 (16), pp. R618–R619, doi:10.1016/j.cub.2012.06.031 
  2. ^ a b "National Institute of Genetics: OHTA, Tomoko - Professor Emeritus". NIG. Retrieved 20 April 2016. 
  3. ^ Steen, TY. 2008 "The Case of Ohta Tomoko: A Woman Geneticist in the Neutralist-Selectionist Evolution Controversy." Historia Scientiarum, volume 18(2), pages, 172–184.
  4. ^ "National Institute of Genetics Feature: Our Leaders in Genetics". NIG. Retrieved 5 July 2011. 

External links[edit]