Southern blot is a DNA hybridization assay used to detect a defined DNA sequence within restriction-digested or otherwise fragmented genomic DNA. The method separates DNA fragments by agarose gel electrophoresis, transfers the size-resolved DNA pattern onto a solid support, denatures the DNA to permit base pairing, and detects fragments that hybridize with a complementary labeled probe; the readout is a band, smear, or fragment-size distribution corresponding to the target sequence and its restriction-fragment context. The assay reflects sequence presence, restriction fragment length, gene copy pattern, structural rearrangement, insertion or deletion affecting restriction sites, and some repeat-length or terminal restriction fragment applications when the experimental design links the probe to those genomic features. Classic applications include Southern blot-based telomere terminal restriction fragment analysis and minisatellite-based DNA fingerprinting, which illustrate how the same
Southern Blot
Southern Blot is a molecular biology technique used to detect DNA sequences. The method includes DNA electrophoresis, transfer to membrane, DNA fixation, DNA probe hybridization and detection. Southern Blot is often used to determine the presence, size, quantity, and structure of target genes. The application fields of this technology include genomics research, detection of gene rearrangements, DNA methylation analysis, etc. Although widely used in the field of DNA detection, the operation of Southern Blot is relatively cumbersome and has been gradually replaced by higher-throughput technologies such as PCR and sequencing in recent years.
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