Delayed Response of QM- and DA/DAPI-Fluorescence in C-Heterochromatin of the Small Japanese Field Mouse, Apodemus argenteu
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概要
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The small Japanese field mouse Apodemus argenteus has the diploid chromosome number of 46, carrying rather large centromeric C-heterochromatin in most of the 44 authosomes and a large amount of C-heterochromatin in the sex chromosomes : the largest subtelocentric X was heterochromotic in almost two-fifth (whole short arm and proximal part of the long arm) of its entire length and the medium-sized acrocentric Y was totally heterochromatic. The C-heterochromatin (C-positive) areas, other than those of the Y and smallest three paris, hd a unique property of "delayed QM-fluorescence", which has not been reported to-date, showing dull QM-fluorescence immeidately after exposure to blue light (BL), but gradually turning to bright fluorescence in a few minutes. The fluorescence intensity gradually decreased after attaining its peak, and finally became extinct. A similar pattern of fluorescence was also obtained in DA/DAPI-stained X chromosome C-heterochromatin, but not in autosomal C-heterochromtin. No such dull-to bright transition of QM-fluorescence could be obtained by CMA_3 staining, for which the C-positive areas were apparently negative even after overexposure to BL. These facts indicate that the C-positive areas of A. argenteus showing dull-to bright transition of QM-fluorescence contain A-T rich DNA. The delayed QM-fluorescence was found only in A. argenteus, in thirteen mammalian species so-far exmined. Furthermore, this unique property of QM-fluorescence could be artificially altered to non-delayed ordinary type of fluorescence by sequenctially pretreating the fixed chromosomes with hydrochloride and barium hydroxide solutions. The cytological implication of the delayed fluorescence in the C-heterochromatin of A. argenteus is briefly discussed.
- 社団法人日本動物学会の論文
著者
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SASAKI Sanae
Department of Bacteriology, Hirosaki University School of Medicine, Hirosaki University
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IGARASHI Yu
Department of Analytical Chemistry, Research Institute for Animal Science in Biochemistry and Toxico
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Igarashi Yu
Department Of Analytical Chemistry Research Institute For Animal Science In Biochemistry And Toxicol
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Igarashi Yu
Department Of Biology Faculty Of Science Hirosaki University
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Sasaki Sanae
Department Of Biology Faculty Of Science Hirosaki University
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Sasaki Sanae
Department Of Bacteriology Hirosaki University School Of Medicine Hirosaki University
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Obata Yoshitaka
Department of Biology, Faculty of Science, Hirosaki University
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Obata Yoshitaka
Department Of Biology Faculty Of Science Hirosaki University
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OBARA Yoshitaka
Deparment of Biology, Faculty of Science, Hirosaki University
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