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Genetic barcode sequencing for screening altered population dynamics of hematopoietic stem cells transduced with lentivirus.

Abstract：

:Insertional mutagenesis has been associated with malignant cell transformation in gene therapy protocols, leading to discussions about vector security. Therefore, clonal analysis is important for the assessment of vector safety and its impact on patient health. Here, we report a unique approach to assess dynamic changes in clonality of lentivirus transduced cells upon Sanger sequence analysis of a specially designed genetic barcode. In our approach, changes in the electropherogram peaks are measured and compared between successive time points, revealing alteration in the cell population. After in vitro validation, barcoded lentiviral libraries carrying IL2RG or LMO2 transgenes, or empty vector were used to transduce mouse hematopoietic (ckit+) stem cells, which were subsequently transplanted in recipient mice. We found that neither the empty nor IL2RG encoding vector had an effect on cell dynamics. In sharp contrast, the LMO2 oncogene was associated with altered cell dynamics even though hematologic counts remained unchanged, suggesting that the barcode could reveal changes in cell populations not observed by the frontline clinical assay. We describe a simple and sensitive method for the analysis of clonality, which could be easily used by any laboratory for the assessment of cellular behavior upon lentiviral transduction.

journal_name

Mol Ther Methods Clin Dev

journal_title

Molecular therapy. Methods & clinical development

authors

Zanatta DB,Tsujita M,Borelli P,Aguiar RB,Ferrari DG,Strauss BE

doi

10.1038/mtm.2014.52

subject

Has Abstract

pub_date

2014-11-19 00:00:00

pages

14052

issn

2329-0501

pii

S2329-0501(16)30121-8

journal_volume

1

pub_type

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