What is S japonicus


What is Schizosaccharomyces japonicus?  

Schizosaccharomyces japonicus is a member of genus Schizosaccharomyces, which was originally isolated by Matao Yukawa and Tetsuo Maki from strawberry field of Kyusyu University in Japan (1). They have reported as follows, gIn the May in 1928, we have harvested strawberries from a farm yard of Kyusyu University, and clushed , and cane sugar and tartaric aid was added to adjust the sugar concentration of 20 % and the acidity of 1 % (as tartaric acid). We let them fermented in 15 litre of fermentation glass tube. Day 2, they start to bubble, c..h (1).


One of the striking feature of S. japonicus is its size of the cell, and visibly condensed mitotic chromosomes (2, 3). CF Robinow and JS Hyams have reported gThe behaviour of the chromosomes in dividing nuclei of vegetative cells is best studied in the larger species of fission yeasts, namely, S.japonicus and S. japonicus var. versatilis.h (3). There are clear difference from S. pombe, not only its size, but also the ability to make mycelia (4, 5, see also Figure 1 and 2). It should be noted that S. japonicus forms ascospore with eight spores and is iodine negative (1, 6, 7).

Utility and other Info

This less characterised fission yeast has been sequenced of its genome. The data is obtained from the Broad Institute website (http://www.broad.mit.edu/) . The gtypeh strain is IFO1609 (ATCC10660), and that is the strain sequenced. The true-heterothallic strains (h- like: NIG5872, h+ like: NIG2017) are also available from this website of National Institute of Genetics (8). Using this larger-sized, and dimorphic fission yeast, we are hoping it will provide a new insigt on chromosome metabolism, or diffrentiation.


(1) Yukawa M and Maki T. 1931. Regarding the new fission yeast Schizosaccharomyces Japonicus. Kyushu Daigaku Kiyou (Japanese) 218-226
(2) Robinow CF. 1981. The View Through The Microscope. Current Development in Yeast Research.
(3) Robinow CF and JS Hyams. 1989. General Cytology of fission yeasts. 273-330
(4) Sipiczki M, Takeo K, Gralert A. 1998. Growth polarity transitions in a dimorphic fission yeast. Microbiology 144 (Pt 12):3475-85
(5) Sipiczki M, Takeo K, Yamaguchi M, Yoshida S and Miklos I. 1998. Environmentally controlled dimorphic cycle in a fission yeast. Microbiology 144 ( Pt 5):1319-30
(6) Vaughan-Martini A and Martini A. 1998. Schizosaccharomyces Lindner. The yeasts : ataxonomic study. Elsevier Science Netherlands Amsterdam. 391-4
(7) Wickerham LJ and Duprat E. 1945. A Remarkable Fission Yeast, Schizosaccharomyces versatilis NOV. SP. J Bacteriol 50:597-607
(8) Furuya and Niki Yeast in press

Figure1 Figure2

Microbial Genetics Laboratory (Niki Laboratory)
Genetics Strains Reseach Center National Institute of Genetics

1111-1 Yata Mishima Shizuoka Japan P.O. 411-8540