| Project/Area Number |
11670262
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Bacteriology (including Mycology)
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| Research Institution | Nagoya University |
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Principal Investigator |
KANBE Toshio School of Medicine, Nagoya University, Assistant Professor, 医学部, 講師 (50093018)
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| Co-Investigator(Kenkyū-buntansha) |
KIKUCHI Akihiko School of Medicine, Nagoya University, Professor, 医学部, 教授 (40283428)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Candida / Aspergillus / Cryptococcus / DNA topoisomerase II / molecular diagnosus / identification / PCR / phylogenetic relationship / 塩基配列 / プライマー / 混合感染 / 病原性真菌 / クリプトコッカサス / トポイソメラーゼII / 診断 |
|---|
| Research Abstract |
We have determined the nucleotide sequences of about 55 % region of DNA topoisomerase II gene (approximately 2.3 kb) isolated from the pathogenic Candida species, C.dubliniensis, C.parapsilosis, C.tropicalis, C.krusei, C.kefyr, C.guilliermondii and C.lusitaniae. Evolutionary relationships among nine Candida species including those of C.albicans and C.glabrata were studied based on the DNA topoisomerase II gene. The nucleotide sequences of 2192 bp, that covered two catalytic domains ; ATPase and cutting/resealing, were subjected for phylogenetic analysis. Sequence comparison and evolutionary analysis have revealed that the Candida species tested here are not monophyletic, and the two strains within the species C.tropicalis and C.parapsilosis are too diverse to be in a single species. Wide variety of the divergence was observed among the functional domains of DNA topoisomerase II, suggesting that Candida species were in the different evolutionary paths at least as regarding DNA topoisomerase II gene. Sequence information and the observation on species-specific manner of molecular evolution of DNA topoisomerase II in Candida will be applied for developing a method of identification and characterization of the Candida species in both natural and clinical isolates.
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