Method for constructing transformant not having selective marker

Chemistry: molecular biology and microbiology – Process of mutation – cell fusion – or genetic modification – Introduction of a polynucleotide molecule into or...

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435471, 435476, 435477, 4353201, 536 232, 536 237, C12Q 168, C07H 2104

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059654449

ABSTRACT:
A DNA construct wherein a DNA fragment which is recombinable in yeast chromosomal DNA is directly or indirectly linked at both ends of a DNA fragment which comprises a pair of R sensitive sequences oriented in the same direction and flaking both an R gene placed under the control of an inducible promoter and an expressible selective marker gene, which is a DNA construct designed with the R sensitive sequences non-symmetrically shortened, so that no functionable R sensitive sequence remains after the R sensitive sequence recombination has occurred by expression of the R gene and the selective marker has been removed. Since no functionable R sensitive sequence remains after removal of the selective marker, recombination does not occur again, and thus the same selective marker may be used for multiple insertions of foreign genes.

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