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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

A demonstration using mouse models that successful gene therapy for cystic fibrosis requires only partial gene correction.

Quantifying the level of transgene expression necessary for phenotypic effect is an important consideration in designing somatic gene therapy protocols. A nonlinear relationship between phenotype and gene activity is predicted by control analysis for any autosomal recessive condition. The unaffected phenotype of heterozygotes for autosomal recessive disorders demonstrates that 50% of the normal level of gene expression is sufficient to prevent disease. By extension, an exaggerated and positive effect on the mutant phenotype is predicted to arise from only a small addition of normal transgene expression delivered by gene therapy. We tested this expectation directly by intercrossing mice carrying different Cftr alleles which modulate Cftr gene expression from 0 to 100%. We demonstrate that 5% of the normal level of Cftr gene expression results in a disproportionately large correction of the chloride ion transport defect (50% of normal) and essentially complete rescue of the intestinal disease (100% survival). It follows that even modest levels of transgene expression and only partial correction of CFTR channel activity may have a significant clinical impact.[1]

References

  1. A demonstration using mouse models that successful gene therapy for cystic fibrosis requires only partial gene correction. Dorin, J.R., Farley, R., Webb, S., Smith, S.N., Farini, E., Delaney, S.J., Wainwright, B.J., Alton, E.W., Porteous, D.J. Gene Ther. (1996) [Pubmed]
 
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