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Multi-conditional SSCP a rapid method for mutation scanning with virtually 100% sensitivity



Multi-conditional SSCP a rapid method for mutation scanning with virtually 100% sensitivity



Official Gazette of the United States Patent & Trademark Office Patents 1250(2), Sep 11



Experiments were performed to test for a set of SSCP conditions that would detect virtually all mutations in a nucleic acid being analyzed. The effects of buffer, gel matrix, temperature, and additive were all tested. Dideoxy fingerprinting was used as a tool to generate a large statistical sample (about 1,500) of mutation-containing single-stranded segments in order to evaluate adequately the sensitivity under a given condition. Mutations in exons H and B/C of the factor IX gene were utilized. SSCP sensitivity, as conveniently measured by the average SSCP efficiency, varied with conditions. Correlation coefficients (R) identified pairs of conditions that were either close to independent or complementary. Five conditions were selected with sufficient redundancy to detect all the mutations in the set tested. The sensitivity of multi-conditional SSCP (SSCP5) was determined by blinded analyses on samples containing mutations in all the eight exon regions in the factor IX gene. All of the 84 single-base substitutions were detected in the blinded. 90% of these mutations were detected by more than one condition. SSCP5 is estimated to be five times faster than fluorescent DNA sequencing for the detection of virtually all mutations when the five conditions are applied.

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Accession: 035349080

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