Screening for mutations by expressing cDNA segments
First Claim
1. A method of locating the position of a pathogenic mutation in an enzyme gene of a human patient suffering from a disease, comprising the steps of:
- (a) deleting at least one segment of a coding region of a normal enzyme cDNA in a starting expression vector to produce a vector containing an inactive enzyme sequence, wherein the segment deletion is within a subregion of the coding region of the normal cDNA corresponding to a subregion of a coding region of an enzyme cDNA from the patient;
(b) replacing in the vector containing the inactive enzymese the subregion of the normal cDNA having undergone the segment deletion with the inserted corresponding subregion of the patient enzyme cDNA to produce a hybrid enzyme;
(c) generating the hybrid enzyme from an expression system containing the expression vector, wherein the hybrid enzyme contains a portion encoded by at least one inserted subregion of the patient enzyme cDNA;
(d) assaying the hybrid enzyme for activity, an absence of enzyme activity or lower than normal enzyme activity of an enzyme generated from the normal enzyme cDNA indicating the presence of the pathogenic mutation in the inserted subregion of the patient enzyme cDNA;
(e) sequencing the inserted subregion of the patient enzyme cDNA in a total cDNA from the hybrid enzyme lacking activity or having lower than normal activity of the enzyme generated from the normal enzyme cDNA; and
(f) comparing the inserted subregion of the patient enzyme cDNA with a corresponding subregion of the normal enzyme cDNA or a normal enzyme genomic DNA to locate the position of the pathogenic mutation.
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Abstract
A rapid screening method is described for detecting, localizing, and expressing pathogenic mutations in patients suffering from diseases which can include genetically inherited diseases. The screening method allows simultaneous localization and expression of the mutation. By identifying the types and locations of the mutations causing a disease, the method can aid in determining the course of treatment for the disease. The method involves making an expression vector containing a sequence encoding an inactive enzyme by deleting a segment of the coding sequence of the enzyme in the vector, replacing the deleted segment with a corresponding segment from a patient'"'"'s enzyme coding sequence to make a hybrid enzyme, expressing the hybrid enzyme and assaying the hybrid enzyme for activity to determine whether the Patient'"'"'s enzyme cDNA contains a pathogenic mutation.
14 Citations
10 Claims
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1. A method of locating the position of a pathogenic mutation in an enzyme gene of a human patient suffering from a disease, comprising the steps of:
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(a) deleting at least one segment of a coding region of a normal enzyme cDNA in a starting expression vector to produce a vector containing an inactive enzyme sequence, wherein the segment deletion is within a subregion of the coding region of the normal cDNA corresponding to a subregion of a coding region of an enzyme cDNA from the patient; (b) replacing in the vector containing the inactive enzymese the subregion of the normal cDNA having undergone the segment deletion with the inserted corresponding subregion of the patient enzyme cDNA to produce a hybrid enzyme; (c) generating the hybrid enzyme from an expression system containing the expression vector, wherein the hybrid enzyme contains a portion encoded by at least one inserted subregion of the patient enzyme cDNA; (d) assaying the hybrid enzyme for activity, an absence of enzyme activity or lower than normal enzyme activity of an enzyme generated from the normal enzyme cDNA indicating the presence of the pathogenic mutation in the inserted subregion of the patient enzyme cDNA; (e) sequencing the inserted subregion of the patient enzyme cDNA in a total cDNA from the hybrid enzyme lacking activity or having lower than normal activity of the enzyme generated from the normal enzyme cDNA; and (f) comparing the inserted subregion of the patient enzyme cDNA with a corresponding subregion of the normal enzyme cDNA or a normal enzyme genomic DNA to locate the position of the pathogenic mutation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification