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- 저자 : Motomi Ito (검색결과 3 건)
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박재홍,최경,Motomi Ito 한국식물분류학회 2008 식물 분류학회지 Vol.38 No.4
The mature fruit wall structures were investigated in Lapsana communis, its six subspecies and the four species of Lapsanastrum (Asteraceae; Lactuceae). Lapsanastrum differs from Lapsana communis in some features: two or three protrudent costae verse equally developed costae, hairly versus glabrous exocarp, respectively. Moreover, Lapsana has no sclerenchymatous‐fiber cells in mesocarp, while Lapsanastrum has sclerenchymatous fiber cells. The differences in fruit wall structure between Lapsana and Lapsanastrum obviously support the separation of Lapsanastrum from Lapsana s. lat.
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Class 1 KNOX Gene Expression Supports the Selaginella Rhizophore Concept
Junko Kawai,Yoichi Tanabe,Sumitomo Soma,Motomi Ito 한국식물학회 2010 Journal of Plant Biology Vol.52 No.4
The spikemoss is marked by the unique rootproducing pleurogeous rhizophore as well as the lycophytic microphyll. Imaichi and Kato (Bot Mag Tokyo 102:369–380, 1989; Am J Bot 78:1694–1703, 1991) revealed that the exogenous developmental process in the rhizophore is clearly distinguishable from the developmental process in the endogenous root, argued that the axial organ could be coordinate with other fundamental organs including the root and stem, and demonstrated the “rhizophore concept.” In this paper, we report on the expression pattern of the spikemoss Selaginella class 1 KNOX gene, SuKNOX1, in the rhizophore. We show that the SuKNOX1 mRNA is specifically accumulated at the tip of the rhizophore as well as the shoot apical apex, but not in the root tip. This result supports the “rhizophore concept” at the molecular level.
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The RUNX1 Enhancer Element eR1: A Versatile Marker for Adult Stem Cells
Chuang, Linda Shyue Huey,Osato, Motomi,Ito, Yoshiaki Korean Society for Molecular and Cellular Biology 2020 Molecules and cells Vol.43 No.2
The identification of adult stem cells is challenging because of the heterogeneity and plasticity of stem cells in different organs. Within the same tissue, stem cells may be highly proliferative, or maintained in a quiescent state and only to be activated after tissue damage. Although various stem cell markers have been successfully identified, there is no universal stem cell marker, which is exclusively expressed in all stem cells. Here, we discuss the roles of master developmental regulator RUNX1 in stem cells and the development of a 270 base pair fragment of the Runx1 enhancer (eR1) for use as stem cell marker. Using eR1 to identify stem cells offers a distinct advantage over gene promoters, which might not be expressed exclusively in stem cells. Moreover, RUNX1 has been strongly implicated in various cancer types, such as leukemia, breast, esophageal, prostate, oral, skin, and ovarian cancers-it has been suggested that RUNX1 dysfunction promotes stem cell dysfunction and proliferation. As tissue stem cells are potential candidates for cancer cells-of-origin and cancer stem cells, we will also discuss the use of eR1 to target oncogenic gene manipulations in stem cells and to track subsequent neoplastic changes.
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