Class I-restricted T-cell responses to a polymorphic peptide in a gene therapy clinical trial for α-1-antitrypsin deficiency

Adeno-associated virus (AAV)-mediated gene therapy is currently being pursued as a treatment for the monogenic disorder α-1-antitrypsin (AAT) deficiency. Results from phase I and II studies have shown relatively stable and dose-dependent increases in transgene-derived wild-type AAT after local intra...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 114; no. 7; pp. 1655 - 1659
Main Authors Calcedo, Roberto, Somanathan, Suryanarayan, Qin, Qiuyue, Betts, Michael R., Rech, Andrew J., Vonderheide, Robert H., Mueller, Christian, Flotte, Terence R., Wilson, James M.
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 14.02.2017
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Online AccessGet full text
ISSN0027-8424
1091-6490
DOI10.1073/pnas.1617726114

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Abstract Adeno-associated virus (AAV)-mediated gene therapy is currently being pursued as a treatment for the monogenic disorder α-1-antitrypsin (AAT) deficiency. Results from phase I and II studies have shown relatively stable and dose-dependent increases in transgene-derived wild-type AAT after local intramuscular vector administration. In this report we describe the appearance of transgene-specific T-cell responses in two subjects that were part of the phase II trial. The patient with the more robust T-cell response, which was associated with a reduction in transgene expression, was characterized more thoroughly in this study. We learned that the AAT-specific T cells in this patient were cytolytic in phenotype, mapped to a peptide in the endogenous mutant AAT protein that contained a common polymorphism not incorporated into the transgene, and were restricted by a rare HLA class I C alleles present only in this patient. These human studies illustrate the genetic influence of the endogenous gene and HLA haplotype on the outcome of gene therapy.
AbstractList The use of adeno-associated virus (AAV)-mediated gene therapy to treat monogenic disorders is currently being tested in phase I, II, and III clinical trials. An immune response to the newly introduced gene product remains a potential problem because of the patient’s lack of central and peripheral tolerance to foreign epitopes. In this study, we show the induction of a T-cell response to the therapeutic product in a α-1-antitrypsin (AAT)-deficient subject receiving AAV1-AAT treatment. The response was directed to an AAT epitope upstream of the mutation and was associated with a polymorphism present in the subject but not in the wild-type AAT therapeutic product. Our study highlights the importance of considering polymorphisms in the targeted population when designing a transgene. Adeno-associated virus (AAV)-mediated gene therapy is currently being pursued as a treatment for the monogenic disorder α-1-antitrypsin (AAT) deficiency. Results from phase I and II studies have shown relatively stable and dose-dependent increases in transgene-derived wild-type AAT after local intramuscular vector administration. In this report we describe the appearance of transgene-specific T-cell responses in two subjects that were part of the phase II trial. The patient with the more robust T-cell response, which was associated with a reduction in transgene expression, was characterized more thoroughly in this study. We learned that the AAT-specific T cells in this patient were cytolytic in phenotype, mapped to a peptide in the endogenous mutant AAT protein that contained a common polymorphism not incorporated into the transgene, and were restricted by a rare HLA class I C alleles present only in this patient. These human studies illustrate the genetic influence of the endogenous gene and HLA haplotype on the outcome of gene therapy.
Adeno-associated virus (AAV)-mediated gene therapy is currently being pursued as a treatment for the monogenic disorder α-1-antitrypsin (AAT) deficiency. Results from phase I and II studies have shown relatively stable and dose-dependent increases in transgene-derived wild-type AAT after local intramuscular vector administration. In this report we describe the appearance of transgene-specific T-cell responses in two subjects that were part of the phase II trial. The patient with the more robust T-cell response, which was associated with a reduction in transgene expression, was characterized more thoroughly in this study. We learned that the AAT-specific T cells in this patient were cytolytic in phenotype, mapped to a peptide in the endogenous mutant AAT protein that contained a common polymorphism not incorporated into the transgene, and were restricted by a rare HLA class I C alleles present only in this patient. These human studies illustrate the genetic influence of the endogenous gene and HLA haplotype on the outcome of gene therapy.
Adeno-associated virus (AAV)-mediated gene therapy is currently being pursued as a treatment for the monogenic disorder a-1-antitrypsin (AAT) deficiency. Results from phase I and II studies have shown relatively stable and dose-dependent increases in transgene-derived wild-type AAT after local intramuscular vector administration. In this report we describe the appearance of transgene-specific T-cell responses in two subjects that were part of the phase II trial. The patient with the more robust T-cell response, which was associated with a reduction in transgene expression, was characterized more thoroughly in this study. We learned that the AAT-specific T cells in this patient were cytolytic in phenotype, mapped to a peptide in the endogenous mutant AAT protein that contained a common polymorphism not incorporated into the transgene, and were restricted by a rare HLA class I C alleles present only in this patient. These human studies illustrate the genetic influence of the endogenous gene and HLA haplotype on the outcome of gene therapy.
Author Betts, Michael R.
Rech, Andrew J.
Qin, Qiuyue
Vonderheide, Robert H.
Flotte, Terence R.
Mueller, Christian
Wilson, James M.
Calcedo, Roberto
Somanathan, Suryanarayan
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polymorphism
immune response
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Edited by Kenneth I. Berns, University of Florida College of Medicine, Gainesville, FL, and approved December 27, 2016 (received for review October 27, 2016)
1R.C. and S.S. contributed equally to this paper.
Author contributions: R.C., S.S., C.M., T.R.F., and J.M.W. designed research; R.C., S.S., Q.Q., and M.R.B. performed research; R.C., S.S., A.J.R., R.H.V., and J.M.W. analyzed data; and R.C., S.S., A.J.R., R.H.V., T.R.F., and J.M.W. wrote the paper.
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Snippet Adeno-associated virus (AAV)-mediated gene therapy is currently being pursued as a treatment for the monogenic disorder α-1-antitrypsin (AAT) deficiency....
The use of adeno-associated virus (AAV)-mediated gene therapy to treat monogenic disorders is currently being tested in phase I, II, and III clinical trials....
Adeno-associated virus (AAV)-mediated gene therapy is currently being pursued as a treatment for the monogenic disorder a-1-antitrypsin (AAT) deficiency....
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SubjectTerms Biological Sciences
Title Class I-restricted T-cell responses to a polymorphic peptide in a gene therapy clinical trial for α-1-antitrypsin deficiency
URI https://www.jstor.org/stable/26479396
https://www.ncbi.nlm.nih.gov/pubmed/28137880
https://www.proquest.com/docview/1863219908
https://www.proquest.com/docview/1881769503
https://pubmed.ncbi.nlm.nih.gov/PMC5320988
Volume 114
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