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  2. Non-homologous end joining - Wikipedia

    en.wikipedia.org/wiki/Non-homologous_end_joining

    Non-homologous end joining (NHEJ) is a pathway that repairs double-strand breaks in DNA. It is called "non-homologous" because the break ends are directly ligated without the need for a homologous template, in contrast to homology directed repair (HDR), which requires a homologous sequence to guide repair.

  3. CRISPR gene editing - Wikipedia

    en.wikipedia.org/wiki/CRISPR_gene_editing

    Knock-out mutations caused by CRISPR-Cas9 result from the repair of the double-stranded break by means of non-homologous end joining (NHEJ) or POLQ/polymerase theta-mediated end-joining (TMEJ). These end-joining pathways can often result in random deletions or insertions at the repair site, which may disrupt or alter gene functionality.

  4. Double-strand break repair model - Wikipedia

    en.wikipedia.org/wiki/Double-strand_break_repair...

    Non-homologous end joining (NHEJ) is one of the major pathways in DSB repair besides HR. [16] The basic concept of NHEJ involves three steps. First, the ends of a DSB is captured by a group of enzymes. The enzymes then form a bridge which connects the DSB ends together, and is lastly followed by religation of the DNA strands. [17]

  5. Microhomology-mediated end joining - Wikipedia

    en.wikipedia.org/wiki/Microhomology-mediated_end...

    Microhomology-mediated end joining (MMEJ), also known as alternative nonhomologous end-joining (Alt-NHEJ) is one of the pathways for repairing double-strand breaks in DNA. As reviewed by McVey and Lee, [1] the foremost distinguishing property of MMEJ is the use of microhomologous sequences during the alignment of broken ends before joining, thereby resulting in deletions flanking the original ...

  6. Genome editing - Wikipedia

    en.wikipedia.org/wiki/Genome_editing

    dsDNA-break repair pathways and genome editing using CRISPR-Cas nucleases. A common form of Genome editing relies on the concept of DNA double stranded break (DSB) repair mechanics. There are two major pathways that repair DSB; non-homologous end joining (NHEJ) and homology directed repair (HDR). NHEJ uses a variety of enzymes to directly join ...

  7. Gene targeting - Wikipedia

    en.wikipedia.org/wiki/Gene_targeting

    Other strategies include in planta gene targeting, whereby the homology repair template is embedded within the plant genome and then liberated using CRISPR cutting; [43] upregulation of genes involved in the homologous recombination pathway; downregulation of the competing Non-Homologous-End-Joining pathway; [39] increasing copy numbers of the ...

  8. Homology directed repair - Wikipedia

    en.wikipedia.org/wiki/Homology_directed_repair

    The pathway of HDR has not been totally elucidated yet (March 2008). However, a number of experimental results point to the validity of certain models. It is generally accepted that histone H2AX (noted as γH2AX) is phosphorylated within seconds after damage occurs. H2AX is phosphorylated throughout the area surrounding the damage, not only ...

  9. Off-target genome editing - Wikipedia

    en.wikipedia.org/wiki/Off-target_genome_editing

    Linear Amplification Mediated - High Throughput Genome Wide Translocation Sequencing, or LAM-HTGTS, is a method developed to track translocation events caused by joining between DSBs. [50] Developed to detect off-target mutations from TALEN and CRISPR-Cas9, this technique is based on DNA repair by end joining in DSBs.

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