Efficient expression of CFTR function with adeno-associated virus vectors that carry shortened CFTR genes

Lei Zhang, Danher Wang, Horst Fischer, Pei Dong Fan, Jonathan Widdicombe, Yuet Wai Kan, Jian Yun Dong

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

Adeno-associated virus (AAV)-based vectors have been shown to be effective in transferring the cystic fibrosis gene (CFTR) into airway epithelial cells in animal models and in patients. However, the level of CFTR gene expression has been low because the vector cannot accommodate the CFTR gene together with a promoter. In this study, we described a strategy to reduce the size of the CFTR cDNA to allow the incorporation of an effective promoter with the CFTR gene into AAV vectors. We engineered and tested 20 CFTR mini-genes containing deletions that were targeted to regions that may contain nonessential sequences. Functional analyses showed that four of the shortened CFTRs (one with combined deletions) retained the function and the characteristics of a wild-type CFTR, as measured by open probability, time voltage dependence, and regulation by cAMP. By using an AAV vector with a P5 promoter, we transduced these short forms of CFTR genes into target cells and demonstrated high levels of CFTR expression. We also demonstrated that smaller AAV/CFTR vectors with a P5 promoter expressed the CFTR gene more efficiently than larger vectors or a vector in which CFTR gene was expressed from the AAV inverted terminal repeat sequence. The CFTR mini-gene with combined deletions was packaged into AAV virions more efficiently, generated higher titers of transducing virions, and more effectively transferred CFTR function into target cells. These new vectors should circumvent the limitations of AAV vector for CFTR expression. Our strategy also may be applicable to other genes, the sizes of which exceed the packaging limit of an AAV vector.

Original languageEnglish (US)
Pages (from-to)10158-10163
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume95
Issue number17
DOIs
StatePublished - Aug 18 1998

Keywords

  • Chloride channel
  • Cystic fibrosis
  • Deletions
  • Gene therapy
  • Patch clamp

ASJC Scopus subject areas

  • Genetics
  • General

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