Question: Discuss the origin.......... Edit
Answer: Transposable elements are mobile genetic units that exhibit broad diversity in their structure and transposition mechanisms. Transposable elements occupy a large fraction of many eukaryotic genomes and their movement and accumulation represent a major force shaping the genes and genomes of almost all organisms. The evolution of TEs and their effect on genome evolution is currently a dynamic field of study.
TEs are found in many major branches of life. They may have originated in the last universal common ancestor, or arisen independently multiple times, or perhaps arisen once and then spread to other kingdoms by horizontal gene transfer. TEs contain mtype of genes- including those conferring antibiotic resistance and ability to transpose to conjugative plasmid. Some TEs also contain integrons(genetic elements that can capture and express genes from other sources) that contain integrase enzyme which can integrate gene cassettes. There are over 40 antibiotic resistance genes identified on cassettes, also virulence genes.
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