| Project/Area Number |
11470076
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Virology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KANEGAE Yumi Institute of Medical Science, The University of Tokyo, Research Instructor, 医科学研究所, 助手 (80251453)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Izumu Institute of Medical Science, The University of Tokyo, Professor, 医科学研究所, 教授 (70158913)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1999: ¥3,800,000 (Direct Cost: ¥3,800,000)
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| Keywords | Adenovirus vector / Cre / loxP / Gene exchange / Cre1 loxP |
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| Research Abstract |
To develop a method for constructing adenovirus vector using gene exchange reaction mediated by Cre recombination. We assayed mutant loxPs recognized independently of wild-type loxP, authentic target sequences of Cre, and identified loxP V as a mutant loxP with high sensitivity and specificity. We examined efficiency of gene exchange reaction using both wild-type loxP and mutant loxP V and showed that the efficiency was no less than 10 %.
The recipient virus for constructing recombinant adenovirus of El -deleted type was designed so that the viral packaging signal (Ψ) was able to be excised by Cre-mediated recombination between a pair of loxP sites located at the both sides of Ψ sequences. We introduced to Cre-expressing 293 cells both a recipient virus and a donor plasmid containing Ψ sequences and a purpose gene flanked with loxP and V. After five cycles of infection of Cre-293 cells with crude viral stock obtained, an adenovirus vector expressing the purpose gene was generated through gene exchange reaction. Pure purpose virus vector was able to be easily isolated after limited dilution using 293 cells.
To construct "gutted vector" whose all viral genes were replaced by a purpose DNA, we prepared a new recipient virus that serves as a helper virus. We also constructed four different donor cosmid cassettes containing cleavage sites of 8-base recognition enzyme as a cloning site in order to insert a purpose gene and a stuffer DNA of large size.
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