A pair of invertedly repeated genes in Chlamydomonas reinhardtii encodes a zygote-specific protein whose expression is UV-sensitive |
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| Authors: | Hidenobu Uchida Lena Suzuki Toyoaki Anai Koji Doi Hiroyoshi Takano Hirofumi Yamashita Toshihiko Oka Shigeyuki Kawano Ken-Ichi Tomizawa Tamotsu Kawazu Haruko Kuroiwa Tsuneyoshi Kuroiwa |
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| Affiliation: | (1) Institute of Biological Sciences, University of Tsukuba, Tsukuba 305-8577, Japan, JP;(2) Department of Biological Sciences, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan, JP;(3) Department of Hygiene and Oncology, Tokyo Medical and Dental University, School of Medicine, Tokyo 113-0034, Japan, JP;(4) Institute of Applied Biochemistry, University of Tsukuba, Tsukuba 305-8577, Japan, JP;(5) Department of Environmental Information, Kyoto Prefectural University, Kyoto 606-8522, Japan, JP;(6) Laboratory of Plant Molecular Physiology, Research Institute of Innovative Technology for the Earth (RITE), Kizu, Kyoto 619-0292, Japan, JP;(7) Division of Biology, Kyoritsu Women's Junior College, Tokyo 101-8433, Japan, JP |
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| Abstract: | Uniparental inheritance of the chloroplast genome has been observed in a wide variety of green plants. In Chlamydomonas this phenomenon, which can be selectively inhibited by UV irradiation of mt + gametes, has been shown cytologically to be due to the preferential degradation of mt −-derived chloroplast nucleoids in young zygotes. The zygote-specific pair of zys1 genes, zys1A and zys1B, is expressed earliest among five genes isolated from a “10-min” zygote library. We report here that the ZYS1 protein, which is encoded by the invertedly duplicated zys1 gene, accumulates in zygotes and is localized in nuclei. In addition, when mt + gametes (but not mt − gametes) are UV-irradiated before mating, only very limited accumulation of ZYS1 protein can be detected in the resulting zygotes. Received: 29 July 1998 / 30 April 1999 |
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| Keywords: | Zygote-specific genes Chlamydomonas reinhardtii Uniparental inheritance |
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