Synthesis of Genes From mRNA,H. Temin,D.Baltimore,Complementary DNA,Molecular Biologists,Synthesized Gene,Vivo

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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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Synthesis of Genes From mRNA
H. Temin and D. Baltimore, in 1970, discovered the presence of 'RNA directed DNA polymerase' (reverse transcriptase) enzyme which has the ability of synthesizing DNA on RNA template. This enabled molecular biologists to synthesize complementary DNA (cDNA) using mRNA as template. If mRNA transcribed from a specific gene is made available in purified form, the complementary DNA (cDNA) synthesized with its help will represent the synthesized gene. To what extent this synthesized gene is a faithful copy of native gene will depend on the fidelity of copying mRNA and also on the stability of DNA thus synthesized. Moreover, since mRNA of a gene does not have the complete transcript of the gene in vivo, the synthesized gene will be smaller than the gene-in vivo.

By copying eukaryotic purified mRNA, several genes have been artificially synthesized.
Most important of these genes are the genes for sea urchin histone proteins, ovalbumin gene in chicken and globin genes in mammals. The gene synthesized as cDNA from a β globin mRNA, has been inserted into a plasmid in order to study its behaviour. As earlier pointed out, this gene will lack any additional regulatory sequences absent in mRNA but present in a globin gene in vivo. This type of gene will also lack intron sequences found in eukaryotic split genes. Another factor causing a difference between synthesized gene and the gene in vivo will depend on the sincerity with which the enzyme will synthesize cDNA. These genes (cDNA) have already become a very important tool in molecular biology experiments.

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Sequencing of a Gene or a DNA Fragment Maxam and Gilbert's Chemical Degradation Method Sanger's Dideoxynucleotide Synthetic Method Automatic DNA Sequencers Slab Gel Versus Capillary Sequencers Slab Gel Sequencing Systems Capillary Gel Sequencing Systems Direct DNA Sequencing Using PCR Ligation Mediated PCR LMPCR DNA Sequencing Through Transcription DNA Sequencing by Hybridization Using Microarrays on DNA Chips DNA Sequencing by DE-MALDI-TOF Mass Spectrometry Synthesis of Genes Synthesis of Gene for Yeast Alanyl tRNA Synthesis of Oligonucleotides Synthesis of Three Duplex Fragments Synthesis of Gene from Three Duplex Fragments Synthesis of Gene for a True Precursor tRNA Total Synthesis of a Human Leukocyte Interferon Gene Gene Synthesis Machines Protection Chemistry and Amidites Permanent Protecting Groups Temporary Protecting Groups Synthesis of Gene Using PCR Synthesis of Genes From mRNA