Katsuhiko Hayashi

is a Japanese reproductive geneticist and stem cell researcher. He achieved same-sex reproduction of male mice and thus ranked Nature's 10. He has been studying the mechanism by which germ cells that transmit genetic information to the next generation are produced. In particular, he has identified the molecules and environmental factors that control the differentiation process of the oocyte lineage leading to eggs by reconstructing this process using pluripotent stem cells. Recently, based on these studies, he has been conducting research into the quality control mechanism of genetic information in the oocyte lineage and the diseases caused by its breakdown.

{| class="wikitable" |+ Biography (excerpts of key points)

|- ! Year !! Qualitification |- | March 1994 || Graduated from Meiji University, Faculty of Agriculture, Department of Agriculture |- | April 1996 || Tokyo University of Science, Institute of Life Science (Molecular Biology Department), Research Assistant

|- | August 2002 || Full-time researcher at the Research Institute of Osaka Prefectural Medical Center for Maternal and Child Health (Division of Etiology and Pathogenesis) |- | March 2004 || Doctor of Science(Tokyo University of Science)

|- | April 2005 || Postdoctoral Research Fellow, Gurdon Institute, University of Cambridge

|- | April 2009 || Kyoto University Graduate School of Medicine (Functional Micromorphology) Lecturer

|- | April 2012 || Associate Professor, Graduate School of Medicine, Kyoto University (Functional Micromorphology)

|- | April 2012 || Associate Professor, Graduate School of Medicine, Kyoto University (Functional Micromorphology)

|- | April 2014 || Professor, Graduate School of Medical Sciences, Kyushu University (Human Genome Stem Cell Division) |- | September 2021 ||Professor, Graduate School of Medicine, Osaka University

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