Cultured silkworm cells capable of highly efficient...

Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving virus or bacteriophage

Reexamination Certificate

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Reexamination Certificate

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07955793

ABSTRACT:
Known cell lines derived from silkworm exhibit low propagation efficiency of BmNPV. Accordingly, systems using known culture cell lines derived from silkworms take a long time to establish recombinant viruses, and are not suitable for preparation of virus solutions with high titers. The present invention provides a cell line Bme21 (FERM P-20852) that is derived from a silkworm embryo and is highly susceptible to BmNPV or its variant having the same biological characteristics. The present invention also provides a method of producing a recombinant virus, a method of producing a recombinant protein, a method of increasing efficiency of recombinant virus production, and a method of increasing efficiency of recombinant protein production, using the cell line Bme21 or its variant.

REFERENCES:
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Lee et al, Journal of Insect Biotechnology and Serocology, 2007, vol. 76, pp. 101-105.
Imanishi, S. et al, “Characteristics of cell lines established from embryonic tissues of several races of the silkworm, Bombyx mori, cultured in vitro,” J. Seric., Sci. Jpn., 1988, vol. 57, No. 3, pp. 184-188.
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Imanishi, S. et al, “Suspension-type Cloned Cell Lines from Embryo Tissues of Bombyx mori,” JARQ, 1992, vol. 26, No. 3, pp. 196-202.
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JPO International Search Report, Appl. No. PCT/JP2007/059028, Jul. 17, 2007, pp. 1-5.
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