Abstract
Purpose
Artemis is an exonuclease essential for V(D)J recombination and repair of DNA double-stranded breaks. Pathogenic variants in DCLRE1C encoding Artemis cause T−B−NK+ severe combined immunodeficiency (SCID), and patients with Artemis-deficient SCID (ART-SCID) require definitive therapy with allogeneic hematopoietic cell transplantation (HCT). Here we describe the clinical and genetic characteristics of patients with ART-SCID who were diagnosed in Japan from 2003 to 2022.
Methods
Clinical data of ART-SCID patients who were diagnosed between 2003 and 2022 in Japan were collected from their physicians using a questionnaire.
Results
ART-SCID diagnosis was made in eight patients from seven families with severe infections within 6 months of life. Two patients had missense variants, five patients had large genomic deletions, and one patient was compound heterozygous for a missense variant and large genomic deletion. All eight underwent allogeneic HCT within 4 months after the diagnosis, 7 receiving a conditioning regimen containing alkylating agents, and one patient without conditioning due to uncontrolled infection. Two patients with poor performance status (PS) died of complications 410 days and 32 days post-HCT, respectively. Of the six surviving patients with a median follow-up time of 8.3 (0.5–17.9) years, three patients had growth retardation. The patients with PS of 0–2 showed a tendency for better overall survival than those with PS 3–4.
Conclusion
Large deletions were the most common genetic cause of ART-SCID in Japan. To improve HCT outcome, early diagnosis with newborn screening for SCID is urgently needed.
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Data Availability
The datasets for this article are not publicly available due to concerns regarding participant/patient anonymity. Requests to access the datasets should be directed to the corresponding author.
Abbreviations
- AUC:
-
Area under the curve
- CBT:
-
Cord blood transplantation
- FISH:
-
Fluorescence in situ hybridization
- GVHD:
-
Graft-versus-host disease
- HCT:
-
Hematopoietic cell transplantation
- HLH:
-
Hemophagocytic lymphohistiocytosis
- KRECs:
-
Kappa-deleting recombination excision circles
- LA:
-
Long and accurate
- MLPA:
-
Multiplex ligation-dependent probe amplification
- NBS:
-
Newborn screening
- PjP:
-
Pneumocystis jirovecii Pneumonia
- PS:
-
Performance status
- SCID:
-
Severe combined immunodeficiency
- SNP:
-
Single-nucleotide polymorphism
- TRECs:
-
T-cell receptor excision circles
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Acknowledgements
We thank the patients and their parents to participate in this study. We also thank Naomi Terada, Maki Yamazaki, Yin Yi, Keiko Obata, and Yasuyoshi Ishiwata for their technical assistance. We are grateful to Dr. Hideki Muramatsu and Masataka Ishimura for giving us the data of NBS.
Funding
This work was supported by MEXT/JSPS KAKENHI (Grant Number: 22K07887) to HK.
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KeI performed genetic analysis, analyzed the data, and wrote the manuscript. S. M. analyzed the data. D. T. performed genetic analysis and provided the patient data. E. A., O. O., and M. CvZ performed genetic analysis. S. A., Y. H., T. I., S. O., Y. O., and KoK provided the patient data. Z. K. and H. O. performed structural analysis. KeK, KoI, M. J. C., and T. M. provided critical discussion. H. K. conceptualized the study and edited the manuscript. All authors read and approved the final manuscript.
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Informed consent was obtained from their parents. This study was conducted in accordance with the Helsinki Declaration and approved by the ethics boards of the Tokyo Medical and Dental University.
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Inoue, K., Miyamoto, S., Tomomasa, D. et al. Clinical and Genetic Characterization of Patients with Artemis Deficiency in Japan. J Clin Immunol 43, 585–594 (2023). https://doi.org/10.1007/s10875-022-01405-3
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DOI: https://doi.org/10.1007/s10875-022-01405-3