Gene therapy for inherited immunodeficiency.
BACKGROUND
During the last decade, gene therapy has emerged as a convincing therapy for primary immunodeficiencies (PIDs). Ex vivo gene transfer into autologous hematopoietic stem cells (HSCs) via viral vectors permits sustained correction of T cell immunodeficiency in two forms of severe combined immunodeficiency: X-linked SCID (SCID-X1) (γ chain [γc] deficiency) and adenosine deaminase deficiency. However, this success has been balanced by the occurrence of genotoxicity generated by the integration of first-generation retroviral vectors. Recently, the development of safer self-inactivating vectors has led to the initiation of new studies with the hope of equivalent efficacy and a better safety profile.


METHODS
This review article focuses on the updated results of gene therapy trials for PIDs - from early studies to ongoing clinical trials. We detail the major advances made in gene transfer and repair technologies, and discuss the many ways to extend our present experience.


CONCLUSIONS
With optimization in terms of safety and efficacy, gene therapy by lentiviral transduction could become a compelling alternative to allogeneic HSC transplantation, and thus may take center stage in the management of PIDs in coming years.
U768 INSERM , Paris , France.
Fabien
F
Touzot
Salima
S
Hacein-Bey-Abina
Alain
A
Fischer
Marina
M
Cavazzana
D000243:Adenosine Deaminase / Q000172:deficiency* / Q000235:genetics / Q000276:immunology; D000361:Agammaglobulinemia / Q000235:genetics / Q000276:immunology / Q000628:therapy*; D000818:Animals; D005544:Forecasting; D015316:Genetic Therapy / Q000009:adverse effects / Q000379:methods / Q000639:trends; D006105:Granulomatous Disease, Chronic / Q000235:genetics / Q000276:immunology / Q000628:therapy*; D006801:Humans; D016511:Severe Combined Immunodeficiency / Q000235:genetics / Q000276:immunology / Q000628:therapy*; D016896:Treatment Outcome; D014923:Wiskott-Aldrich Syndrome / Q000235:genetics / Q000276:immunology / Q000628:therapy*; D053632:X-Linked Combined Immunodeficiency Diseases / Q000235:genetics / Q000276:immunology / Q000628:therapy*
D000243:Adenosine Deaminase
Wiskott–Aldrich syndrome; adenosine deaminase; chronic granulomatous disease; gene therapy; lentiviral vectors; primary immunodeficiency; severe combined immunodeficiency