An update on conformation sensitive gel electrophoresis

Human Mutation
Arupa Ganguly

Abstract

Conformation-sensitive gel electrophoresis (CSGE) was developed as a method of heteroduplex analysis to screen large multi-exon genes for sequence variation. The novelty of the method was in the use of a non-proprietary acrylamide gel matrix that used 1,4-bis (acrolyl) piperazine (BAP) as a cross linker with ethylene glycol and formamide as mildly denaturing solvents. The denaturing environment enhances the conformation polymorphism present in DNA heteroduplexes containing variations as small as single nucleotide polymorphisms (SNPs). CSGE has also been adapted for use on a fluorescent platform (F-CSGE) that resulted in higher throughput and sensitivity. Variation in sensitivity of CSGE has been studied extensively. The results demonstrate that the nature of the mismatched base in a defined sequence context has the most profound effect on the conformation of the heteroduplex. Additionally, the size of the PCR product, as well as the location of the mismatch within the PCR product, are two important parameters that determine the resolution of the mismatch-containing heteroduplexes during CSGE. Like any other mutation scanning technique, CSGE can have limited resolution of two closely linked sequence variations. For specific gene...Continue Reading

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