Escherichia coli-cloned CFTR loci relevant for human artificial chromosome therapy.

Abstract:

:Classical gene therapy for cystic fibrosis has had limited success because of immune response against viral vectors and short-term expression of cDNA-based transgenes. These limitations could be overcome by delivering the complete genomic CFTR gene on nonintegrating human artificial chromosomes (HACs). Here, we report reconstruction of the genomic CFTR locus and analyze incorporation into HACs of three P1 phage-based and F factor bacteria-based artificial chromosomes (PACs/BACs) of various sizes: (1) 5A, a large, nonselectable BAC containing the entire wild-type CFTR locus extending into both adjacent genes (296.8-kb insert, from kb -58.4 to +51.4) containing all regulators; (2) CGT21, a small, selectable, telomerized PAC (134.7 kb, from kb -60.7 to + 2) containing a synthetic last exon joining exon 10, EGFP, exon 24, and the 3' untranslated region; and (3) CF225, a midsized, nonselectable PAC (225.3 kb, from kb -60.7 to +9.8) ligated from two PACs with optimized codons and a silent XmaI restriction variant to discriminate transgene from endogenous expression. Cotransfection with telomerized, blasticidin-S-selectable, centromere-proficient α-satellite constructs into HT1080 cells revealed a workable HAC formation rate of 1 per ∼25 lines when using CGT21 or 5A. CF225 was not incorporated into a de novo HAC in 122 lines analyzed, but integrants were expressed. Stability analyses suggest the feasibility of prefabricating a large, tagged CFTR transgene that stably replicates in the proximity of a functional centromere. Although definite conclusions about HAC-proficient construct configurations cannot be drawn at this stage, important transfer resources were generated and characterized, demonstrating the promise of de novo HACs as potentially ideal gene therapy vector systems.

journal_name

Hum Gene Ther

journal_title

Human gene therapy

authors

Rocchi L,Braz C,Cattani S,Ramalho A,Christan S,Edlinger M,Ascenzioni F,Laner A,Kraner S,Amaral M,Schindelhauer D

doi

10.1089/hum.2009.225

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

1077-92

issue

9

eissn

1043-0342

issn

1557-7422

journal_volume

21

pub_type

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