Abstract
Purpose
Chromosome 22q11.2 deletion syndrome is a common inborn error of immunity. The early consequences of thymic hypoplasia are low T cell numbers. Later in life, atopy, autoimmunity, inflammation, and evolving hypogammaglobulinemia can occur and the causes of these features are not understood. This study utilized an unbiased discovery approach to define alterations in histone modifications. Our goal was to identify durable chromatin changes that could influence cell behavior.
Methods
CD4 T cells and CD19 B cells underwent ChIP-seq analysis using antibodies to H3K4me3, H3K27ac, and H4ac. RNA effects were defined in CD4 T cells by RNA-seq. Serum cytokines were examined by Luminex.
Results
Histone marks of transcriptional activation at CD4 T cell promoters and enhancers were globally increased. The promoter activation signature had elements related to T cell activation and inflammation, concordant with effects seen in the transcriptome. B cells, in contrast, had a minimally altered epigenetic landscape in 22q11.2. Both cell types had an “edge” effect with markedly altered chromatin adjacent to the deletion.
Conclusions
People with 22q11.2 deletion have altered CD4 T cell chromatin and a transcriptome concordant with the changes in the epigenome. These effects support a disease model where qualitative changes to T cells occur in addition to quantitative defects that have been well characterized. This study offers unique insight into qualitative differences in the T cells in 22q11.2 deletion, an aspect that has received limited attention.
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Data Availability
Data is available upon request.
Code Availability
N/A.
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Acknowledgements
We gratefully acknowledge the 22q and You Center at CHOP and all the patients and families.
Funding
KES is supported by the Wallace Chair of Pediatrics.
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Contributions
Dr. Zhe performed the sequencing analyses.
Dr. Shi made the ChIP-seq libraries and performed data analysis.
Mss. Song, Maurer, and Zhao did cell purification, cell culture, and analyses.
Dr. Zackai participated in experimental design.
Mr. Crowley and Mr. McGinn performed data analyses, clinical data extraction, and sample preparation.
Ms. McGinn and Dr. Sullivan were responsible for the conception, compliance, and execution of the experiments.
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This study was approved by the IRB at The Children’s Hospital of Philadelphia.
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Patients consented to the participation in this study.
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The authors declare no competing interests.
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Zhang, Z., Shi, L., Song, L. et al. Chromatin Modifications in 22q11.2 Deletion Syndrome. J Clin Immunol 41, 1853–1864 (2021). https://doi.org/10.1007/s10875-021-01123-2
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DOI: https://doi.org/10.1007/s10875-021-01123-2