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Anchored Lentiviral Vector Episomes for Stem Cell Gene Therapy in Fanconi Anemia

[ Vol. 16 , Issue. 5 ]

Author(s):

Santhosh Chakkaramakkil Verghese and Peter Kurre   Pages 329 - 337 ( 9 )

Abstract:


Fanconi anemia (FA) is an autosomal recessive, multisystem DNA repair disorder with prominent defects in the hematopoietic stem cell maintenance that result in the progressive attrition and failure in the early school age. Allogeneic stem cell transplantation has proved curative for patients with suitable donors. This, along with the characteristic survival advantage of phenotypically normal over non-corrected FA stem cells underscores the compelling rationale for stem cell gene therapy in the FA. While integrating lentiviral vectors (LV) have become the preferred platform for genetic correction in several hematologic and immunodeficiency disorders, the residual oncogenic potential by these vectors raises concerns in the FA stem cells about insertional mutagenic genetic lesions. On this backdrop, investigators are developing a new generation of non-integrating viral vectors capable of nuclear persistence through serial mitotic cycles and stable under selection to offset the comparatively lower transduction rates. Here, we review the competing approaches to develop such non-integrating lentiviral (NILV) episome vectors that faithfully replicate in the stem cells.

Keywords:

Fanconi anemia, Hematopoietic stem/progenitor cells, Gene therapy, Viral vectors, S/MAR.

Affiliation:

Oregon Health & Science University, Pape Family Pediatric Research Institute, L321, Portland



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