Lentiviral Hematopoietic Stem Cell Gene Therapy for X-linked Severe Combined Immunodeficiency
Overview
Science
Authors
Affiliations
X-linked severe combined immunodeficiency (SCID-X1) is a profound deficiency of T, B, and natural killer (NK) cell immunity caused by mutations inIL2RGencoding the common chain (γc) of several interleukin receptors. Gamma-retroviral (γRV) gene therapy of SCID-X1 infants without conditioning restores T cell immunity without B or NK cell correction, but similar treatment fails in older SCID-X1 children. We used a lentiviral gene therapy approach to treat five SCID-X1 patients with persistent immune dysfunction despite haploidentical hematopoietic stem cell (HSC) transplant in infancy. Follow-up data from two older patients demonstrate that lentiviral vector γc transduced autologous HSC gene therapy after nonmyeloablative busulfan conditioning achieves selective expansion of gene-marked T, NK, and B cells, which is associated with sustained restoration of humoral responses to immunization and clinical improvement at 2 to 3 years after treatment. Similar gene marking levels have been achieved in three younger patients, albeit with only 6 to 9 months of follow-up. Lentiviral gene therapy with reduced-intensity conditioning appears safe and can restore humoral immune function to posthaploidentical transplant older patients with SCID-X1.
Eshghi S, Mousakhan Bakhtiari M, Behfar M, Izadi E, Naji P, Jafari L Regen Ther. 2025; 28():262-279.
PMID: 39844821 PMC: 11751425. DOI: 10.1016/j.reth.2024.12.007.
Cardiomyopathy: pathogenesis and therapeutic interventions.
Huang S, Li J, Li Q, Wang Q, Zhou X, Chen J MedComm (2020). 2024; 5(11):e772.
PMID: 39465141 PMC: 11502724. DOI: 10.1002/mco2.772.
Bzhilyanskaya V, Ma L, Liu S, Fox L, Whittaker M, Meis R Sci Transl Med. 2024; 16(769):eadj6779.
PMID: 39413163 PMC: 11753194. DOI: 10.1126/scitranslmed.adj6779.
Zakas P, Cunningham S, Doherty A, van Dijk E, Ibraheim R, Yu S Mol Ther. 2024; 32(10):3356-3371.
PMID: 38981468 PMC: 11489535. DOI: 10.1016/j.ymthe.2024.06.021.
Gupta A, Azul M, Bhoopalan S, Abraham A, Bertaina A, Bidgoli A Cytotherapy. 2024; 26(11):1411-1420.
PMID: 38970612 PMC: 11471386. DOI: 10.1016/j.jcyt.2024.06.002.