DNA Sequencing by DE-MALDI-TOF Mass Spectrometry,Synthetic Oligonucleotides,Mass Analysis,Sangers Method

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Isolation, Sequencing and Synthesis of Genes Isolation, Sequencing and Synthesis of Genes - Introduction Isolation of Genes Isolation of Genes Coding for Specific Proteins Isolation of Genes with Known or Unknown Products having Tissue Specific Expression Isolation of Genes with Known or Unknown Products Using DNA or RNA Probes Use of Heterologus Probes Use of Synthetic Probes Isolation of Genes Coding Use of Transposable Elements Transposon Tagging T-DNA-Insertion Mutagenesis for Isolation of Plant Genes Promoter Enhancer and Gene Trap for Isolation of Genes Differential Screeing and Differential Display Technique for Isolation of Genes Subtractive Hybridizatioon for Gene Isolation Map Based Cloning for Gene Isolation Isolation of Novel Genes by Asis Data at JNU New Delhi

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DNA Sequencing by DE-MALDI-TOF Mass Spectrometry
Matrix assisted laser desorption/ionization mass spectrometry (MALDI-MS) has the potential to rapidly acquire DNA sequence information. It has been successfully used for confirmation of the sequences of short synthetic oligonucleotides by mass from (i) synthesis failures (as in Sanger’s method) or due to (ii) time-dependent exonuclease digestion. In both cases different products (oligonucleotides) will differ by single nucleotides. The mass of each fragment can be accurately determined and the fragments can be arranged by differences of single nucleotides. The can be identified by mass differences. This method of sequencing has been applied only to short oligonucleotides, since the resolution and sensitivity of MALDI- TOF goes down with increasing size.

For the purpose of DNA sequencing, MALDI- TOF mass spectrometry can also be used in combination with Sanger's termination reactions. In this approach, mass spectra of the four Sanger's sequencing reactions are overlaid and each sized product connected to one of the four bases. The advantage of this approach is that MALDI- TOF MS is quick, requiring only minutes per sample and no gels, radioactivity or fluorescent labelling is required. Although in theory this should work, in practice problems have been faced due to limited amounts of termination products and due to the presence of buffer salts and other components in the reaction mixture. The resolution was improved by introducing delayed ion extraction (DE MALDI). More details about MALDI- TOF mass spectrometry were discussed in.

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