Methods and compositions for elucidating relative protein expression levels in cells
First Claim
Patent Images
1. A method of elucidating a protein expression profile of a test cell line or group of cells, the method comprising:
- (A) randomly introducing into the genome of a cell or group of cells a promoterless polynucleotide construct, the construct comprising in a 5′
to 3′
orientation;
i) a splice acceptor consensus sequence;
ii) the complementary sequence of a type IIS restriction enzyme recognition sequence;
iii) an oligonucleotide sequence encoding assayable marker peptide; and
iv) a polyadenylation sequence;
(B) wherein said promoterless polynucleotide construct when introduced into an actively expressed gene results in the generation of a truncated cellular protein fused at its C-terminal truncated end to the marker peptide; and
i) identifying those cells expressing said marker peptide fused to said truncated cellular protein;
ii) determining the identity of the truncated proteins to which the marker peptide is fused in each group of cells,
thereby elucidating a protein expression profile of a test cell line of group of cells.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates generally to methods and compositions for the identification of differential protein expression patterns and concomitantly the active genetic regions that are directly or indirectly involved in different tissue types, disease states, or other cellular differences desirable for diagnosis or for targets for drug therapy.
-
Citations
22 Claims
-
1. A method of elucidating a protein expression profile of a test cell line or group of cells, the method comprising:
-
(A) randomly introducing into the genome of a cell or group of cells a promoterless polynucleotide construct, the construct comprising in a 5′
to 3′
orientation;
i) a splice acceptor consensus sequence;
ii) the complementary sequence of a type IIS restriction enzyme recognition sequence;
iii) an oligonucleotide sequence encoding assayable marker peptide; and
iv) a polyadenylation sequence;
(B) wherein said promoterless polynucleotide construct when introduced into an actively expressed gene results in the generation of a truncated cellular protein fused at its C-terminal truncated end to the marker peptide; and
i) identifying those cells expressing said marker peptide fused to said truncated cellular protein;
ii) determining the identity of the truncated proteins to which the marker peptide is fused in each group of cells,
thereby elucidating a protein expression profile of a test cell line of group of cells. - View Dependent Claims (2, 3, 4, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
5. A method of identify differentially expressed proteins in two different populations of cells, the method comprising:
-
(A) randomly introducing into the genomes of a reference group of cells and into the genomes of a test group of cells a promoterless polynucleotide construct, wherein the construct comprises in a 5′
to 3′
orientation;
i) a splice acceptor consensus sequence;
ii) the complementary sequence of a type IIS restriction enzyme recognition sequence;
ii) an oligonucleotide sequence encoding assayable marker peptide; and
iv) a polyadenylation sequence;
(B) thereby generating a population of randomly truncated cellular proteins fused at their C-terminals truncated end to the marker peptide; and
i) sorting both groups of cells into subpopulations of cells based on their differential expression levels of the marker peptide;
ii) determining the identity of the fusion proteins generated in each subgroup of sorted cells; and
iii) comparing by statistical methods the protein expression profiles obtained for the test group of cells against the protein expression profiles obtained for the reference group of cells,
thereby identifying differences in the expression levels of fusion proteins among the two groups of cells. - View Dependent Claims (6)
-
Specification