Scientists discovered naturally existing DNA editing tool - Bridge Recombinase Mechanism | Current Affairs | Vision IAS
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Bridge Recombinase Mechanism (BRM) utilizes mobile genetic elements or “jumping genes”, which cut and paste themselves into genomes, performing on-the-go DNA manipulation and are present in all forms of life.

  • Jumping Genes are small DNA segments with a recombinase enzyme along with extra DNA segments at the ends of the genes that binds and manipulates DNA. 
  • Gene editing is alteration of genetic material of a living organism by inserting, replacing, or deleting a DNA sequence, with the aim of improving some characteristic of a plant/ animal or correcting a genetic disorder.

About BRM

  • Extra DNA at the ends of jumping genes gets joined together and converts the DNA double helix structure into a single-stranded RNA molecule.
  • This bridge RNA molecule can bind to two DNA segments (donor and target), allowing for flexible DNA modifications.
  • Donor and target loop can be programmed independently, offering great flexibility in inserting or recombining sequences to DNA.

Significance of BRM

  • It will allow researchers to rearrange, recombine, invert, duplicate, move, and perform other editing operations on very long DNA sequences.
  •  It can lead to development of more advanced gene editing therapeutics and treatments for diseases. 

Other Gene-editing technologies

  • CRISPR-Cas9: It is a customizable tool that lets scientists cut and insert small pieces of DNA at precise areas along a DNA strand.
  • TALE nucleases: Nucleases that cleave unique genomic sequences in living cells can be used for targeted gene editing.
  • Zinc-finger nucleases: Targeted to cleave a chosen genomic sequence and provokes cellular repair processes that in turn mediate efficient modification of the targeted location.
  • RNA interference (RNAi): Targets RNA molecules to block or activate gene expression.
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