Method for the modification of the expression characteristics of an endogenous gene of a given cell line
DCFirst Claim
1. A method of activating a predetermined normally transcriptionally silent gene within the genome of a cell line so as to enable said cell line to express the gene product of said gene, comprising inserting a DNA construct into said genome by homologous recombination, said DNA construct comprising a DNA regulatory segment capable of stimulating expression of said gene when operatively linked thereto and a DNA targeting segment homologous to a region of said genome within or proximal to said gene, wherein said construct is inserted such that said regulatory segment is operatively linked to said gene of interest.
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Abstract
Normally transcriptionally silent genes in a cell line or microorganism may be activated for expression by inserting a DNA regulatory element which is capable of promoting the expression of a normally expressed gene product in that cell or which is promiscuous, the regulatory element being inserted so as to be operatively linked with the normally silent gene in question. The insertion is accomplished by means of homologous recombination by creating a DNA construct including a segment having a DNA segment of the normally silent gene (targeting DNA) and the DNA regulatory element to induce gene transcription. The technique is also used to modify the expression characteristics of any endogenous gene of a given cell line or microorganism.
406 Citations
58 Claims
- 1. A method of activating a predetermined normally transcriptionally silent gene within the genome of a cell line so as to enable said cell line to express the gene product of said gene, comprising inserting a DNA construct into said genome by homologous recombination, said DNA construct comprising a DNA regulatory segment capable of stimulating expression of said gene when operatively linked thereto and a DNA targeting segment homologous to a region of said genome within or proximal to said gene, wherein said construct is inserted such that said regulatory segment is operatively linked to said gene of interest.
- 2. A method of modifying, the expression characteristics of predetermined a gene within the genome of a cell line, comprising inserting a DNA construct into said genome by homologous recombination, said DNA construct comprising a DNA regulatory segment capable of modifying the expression characteristics of said gene when operatively linked thereto, as compared to its existing DNA regulatory segment, and a DNA targeting segment homologous to a region of said genome within or proximal to said gene, wherein said construct is inserted such that said regulatory segment is operatively linked to said gene of interest.
- 3. A method of modifying the expression characteristics of a predetermined gene within the genome of a cell line, comprising inserting a DNA construct into said genome by homologous recombination, said DNA construct comprising an expressible, amplifiable gene capable of amplifying said gene when inserted in sufficiently close proximity thereto, and a DNA targeting segment homologous to a region of said genome within or proximal to said gene, wherein said construct is inserted such that said amplifiable gene is in sufficiently close proximity to said gene of interest to cause amplification thereof when said amplifiable gene is amplified.
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17. A genome of a cell line, the genome having a DNA regulatory segment operatively linked with a predetermined naturally occurring gene at an insertion site characterized by a predetermined DNA sequence, said DNA regulatory segment not being naturally occurring at said location in the genome.
- 18. A cell line capable of expressing a gene product by a predetermined normally transcriptionally silent gene within the genome of said cell line, said genome having inserted therein a DNA regulatory segment operatively linked with said normally transcriptionally silent gene, said DNA regulatory segment being capable of promoting the expression of a gene product by said cell line.
- 19. A cell line capable of enhanced expression of a gene product compared to the cell line from which it is derived, said gene product being the expression product of predetermined an endogenous gene within the genome of said cell, said genome having inserted therein in an operative manner, at or near said endogenous gene, an exogenous DNA regulatory segment and/or amplifiable gene capable of enhancing the expression of said gene product by said cell line.
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26. A DNA construct for insertion into a predetermined host cell line, comprising a DNA regulatory segment capable of modifying the expression characteristics of genes in the host cell line when operatively linked thereto and a DNA targeting segment homologous to a region of the genome of a preselected gene within the host cell line.
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27. A DNA construct for insertion into a predetermined host cell line, comprising an expressible, amplifiable gene capable of amplifying a gene in the host cell line when inserted in sufficiently close proximity thereto, and a DNA targeting segment homologous to a region of the genome of a preselected gene within the host cell line.
Specification