Multicellular living organisms and unmodified parts thereof and – Method of making a transgenic nonhuman animal – Via microinjection of a nucleus into an embryo – egg cell – or...
Reexamination Certificate
2008-01-22
2008-01-22
Crouch, Deborah (Department: 1632)
Multicellular living organisms and unmodified parts thereof and
Method of making a transgenic nonhuman animal
Via microinjection of a nucleus into an embryo, egg cell, or...
C800S008000, C800S015000, C800S016000, C800S017000
Reexamination Certificate
active
07321076
ABSTRACT:
A method of reconstituting an animal embryo involves transferring a diploid nucleus into an oocyte which is arrested in the metaphase of the second meiotic division. The oocyte is not activated at the time of transfer, so that the donor nucleus is kept exposed to the recipient cytoplasm for a period of time. The diploid nucleus can be donated by a cell in either the G0or G1phase of the cell cycle at the time of transfer. Subsequently, the reconstituted embryo is activated. Correct ploidy is maintained during activation, for example, by incubating the reconstituted embryo in the presence of a microtubule inhibitor such as nocodazole. The reconstituted embryo may then give rise to one or more live animal births. The invention is useful in the production of transgenic animals as well as non-transgenics of high genetic merit.
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Campbell Keith Henry Stockman
Wilmut Ian
Crouch Deborah
Finnegan Henderson Farabow Garrett & Dunner LLP
Roslin Institute
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