LEDGF Hybrids Efficiently Retarget Lentiviral Integration into Heterochromatin

Overview

Journal Mol Ther

Publisher Cell Press

Specialties Molecular Biology
Pharmacology

Date 2010 Mar 3

PMID 20195265

Citations 94

Authors

Rik Gijsbers

Keshet Ronen

Sofie Vets

Nirav Malani

Jan De Rijck

Melissa McNeely

Frederic D Bushman

Zeger Debyser

Affiliations

Soon will be listed here.

Abstract

Correction of genetic diseases requires integration of the therapeutic gene copy into the genome of patient cells. Retroviruses are commonly used as delivery vehicles because of their precise integration mechanism, but their use has led to adverse events in which vector integration activated proto-oncogenes and contributed to leukemogenesis. Here, we show that integration by lentiviral vectors can be targeted away from genes using an artificial tethering factor. During normal lentivirus infection, the host cell-encoded transcriptional coactivator lens epithelium-derived growth factor/p75 (LEDGF/p75) binds lentiviral integrase (IN), thereby targeting integration to active transcription units and increasing the efficiency of infection. We replaced the LEDGF/p75 chromatin interaction-binding domain with CBX1. CBX1 binds histone H3 di- or trimethylated on K9, which is associated with pericentric heterochromatin and intergenic regions. The chimeric protein supported efficient transduction of lentiviral vectors and directed the integration outside of genes, near bound CBX1. Despite integration in regions rich in epigenetic marks associated with gene silencing, lentiviral vector expression remained efficient. Thus, engineered LEDGF/p75 chimeras provide technology for controlling integration site selection by lentiviral vectors.

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