What question did this study set out to answer?

Identify the cellular mechanisms that restrict retroviral gene transfer and expression in committed versus multipotent hematopoietic precursor and stem cell lines.

April 1, 1991Human Gene Therapy

Retroviral Vectors Related to the Myeloproliferative Sarcoma Virus Allow Efficient Expression in Hematopoietic Stem and Precursor Cell Lines, but Retroviral Infection Is Reduced in More Primitive Cells

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Authors

GBGabriele Beck‐EngeserCity College of San Francisco CSCarol StockingUniversität Hamburg UJUrsula JustLeibniz Institute of Virology (LIV)

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Implication

In vitro study demonstrates that myeloproliferative sarcoma virus vectors overcome transcriptional blocks in stem cells, highlighting persistent pre-integration barriers to retroviral infection.

Key Points

Identify the cellular mechanisms that restrict retroviral gene transfer and expression in committed versus multipotent hematopoietic precursor and stem cell lines.
Examined retroviral gene transfer efficiency in differentiation-restricted hematopoietic precursors (FDC-P1, FDC-P2) and multipotent progenitor cell lines (FDC-Pmix).
Compared transcriptional regulation and pre-integration infection steps using vectors derived from the myeloproliferative sarcoma virus (MPSV) alongside standard retroviral vectors.
Demonstrated two distinct cellular blocks: a stem-cell-specific transcriptional block and a pre-integration block occurring prior to proviral DNA synthesis.
Showed that MPSV-derived vectors fully bypass the transcriptional restriction across all hematopoietic lineages due to unique regulatory regions.
Observed that the pre-integration block limits infection efficiency across all retroviral vectors tested and intensifies in more primitive multipotent blast cells.

Cite This Study

Beck‐Engeser et al. (1991) studied this question.

synapsesocial.com/papers/6a1d85c97328fa9a742f9ffd https://doi.org/10.1089/hum.1991.2.1-61

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Implication

In vitro study demonstrates that myeloproliferative sarcoma virus vectors overcome transcriptional blocks in stem cells, highlighting persistent pre-integration barriers to retroviral infection.