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Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus Macaca mulatta

PROVIDER: GSE261047 | GEO | 2024/03/11

REPOSITORIES: GEO

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Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (Tn5 NHP)

Project description:We investigated long-term human coagulation Factor IX expression of a novel variant when delivered into mice and rhesus macaques and compare transduction efficiencies using two different AAV capsids. In hemophilic mice injected with KP1-packaged rAAV expressing the hyperactive FIX variant specific activity plasma levels were 10-fold or 2-fold enhanced when compared to wild-type or Padua huFIX injected mice, respectively. In rhesus macaques AAV-LK03 capsid outperformed AAV-KP1 in terms of antigen expression and liver transduction. Two animals from each group showed sustained low-level huFIX expression at 3 months post-administration, while one animal from each group lost huFIX mRNA and protein expression over time despite comparable vector copies. We investigated if epigenetic differences in the vector episomes could explain this loss of transcription. Cut&Tag analysis revealed lower levels of activating histone marks in the two animals that lost expression. When comparing rAAV genome associated histone modifications in rhesus macaques to those in mice injected with the same vector, the activating histone marks were starkly reduced in macaque-derived episomes. Differential epigenetic marking of AAV genomes may explain different expression profiles in mice and rhesus macaques as well as the wide dose response variation observed in primates in both preclinical and human clinical trials.

2024-03-11 | GSE261046 | GEO

Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (Tn5 mouse)

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Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (CnT NHP)

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Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (CnT mouse)

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Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques

Project description:Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques

| PRJNA1084871 | ENA

Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (CnT mouse)

Project description:Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (CnT mouse)

| PRJNA1084872 | ENA

Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (Tn5 NHP)

Project description:Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (Tn5 NHP)

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Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (CnT NHP)

Project description:Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (CnT NHP)

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Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (Tn5 mouse)

Project description:Correlation of antigen expression with epigenetic modifications after rAAV delivery of a human Factor IX variant in mice and rhesus macaques (Tn5 mouse)

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Antigen-specific NK cell memory in rhesus macaques.

Project description:Natural killer (NK) cells have traditionally been considered nonspecific components of innate immunity, but recent studies have shown features of antigen-specific memory in mouse NK cells. However, it has remained unclear whether this phenomenon also exists in primates. We found that splenic and hepatic NK cells from SHIV(SF162P3)-infected and SIV(mac251)-infected macaques specifically lysed Gag- and Env-pulsed dendritic cells in an NKG2-dependent fashion, in contrast to NK cells from uninfected macaques. Moreover, splenic and hepatic NK cells from Ad26-vaccinated macaques efficiently lysed antigen-matched but not antigen-mismatched targets 5 years after vaccination. These data demonstrate that robust, durable, antigen-specific NK cell memory can be induced in primates after both infection and vaccination, and this finding could be important for the development of vaccines against HIV-1 and other pathogens.

| S-EPMC4545390 | biostudies-literature

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