Molecular genetic engineering

Apuntes

•Molecular Genetics and Recombinant DNA Technology Techniques for DNA extraction are effective mainly for short molecules. Isolating specific genes from human DNA involves separating hundreds to thousands of base pairs, but restriction enzymes produce millions of fragments, making direct cloning impractical. Recombinant DNA technology creates smaller, manageable fragments for study. •Plasmids: Definition and Significance Coined by Joshua Lederberg in 1952, plasmids are double-stranded DNA elements that replicate independently, carrying genes. They are common in archaea, eukaryotes, but most significant in bacteria, where they transfer via conjugation, often conferring advantages like antibiotic resistance. Their relationship with hosts is symbiotic and replication ensures inheritance. •Advances in Recombinant DNA Technology (1970s) The discovery of restriction enzymes, DNA ligase, and gel electrophoresis enabled transfer of DNA fragments between chromosomes and plasmids, facilitating the creation of recombinant molecules essential for gene studies. •Molecular Cloning and Plasmid Design Standard plasmids (~3000–6000 bp) contain a replication origin, antibiotic-resistance ...