Few days ago, I blogged about how Perez et al made use of zinc finger nucleases as DNA scissors to get rid of the CCR5 allele within the CD4 T cell, which would confer resistance to the HIV virus. Yet another method exists, which allows gene editing to be made to the CCR5 gene. This is achieved using single-stranded oligonucleotides. These single-stranded oligonucleotides were shown to induce site-specific alterations by activation of DNA repair pathways.
Oligonucleotide-based gene editing has been suggested as an approach to correct genes resulting in neuro-muscular disorders (Bertoni, 2005). Other than single stranded DNA oligonucleotides, DNA/RNA hybrid molecules and double stranded DNA molecules of 100 - 1000 base pairs can be used. The use of microinjection technology allow for the introduction of these genome-altering molecules into the stem cell (Davis).
Unlike current therapeutic approach to correct the defective gene, the trick is to make the CCR5 gene defective which is the opposite, and in doing so, generate a population of HIV-resistant CD4 T cells.
Citations
1) Bertoni C. Oligonucleotide-mediated gene editing for neuromuscular disorders. Acta Myol. 2005 Dec;24(3):194-201.
2) David BR. Genome editing - Its promise and limitations for gene therap. At: http://www.pasteur.fr/applications/euroconf/geneandcelltherapy/22_Davis_abstract.pdf
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