Biallelic MCM10 Deficiency Presenting with Natural Killer Cell Deficiency, Poikiloderma and EBV-Associated Malignancy
4 affiliations
- 1The Genetics Institute and Genomics Center, Tel Aviv Sourasky University Medical Center, 6 Weizmann St, Tel Aviv, 64239 Israel
- 2Gray Faculty of Medical & Health Sciences, Tel Aviv University, Tel Aviv, Israel
- 3Allergy and Clinical Immunology Unit, Department of Medicine, Tel Aviv Sourasky University Medical Center, 6 Weizmann St, Tel Aviv, 64239 Israel
- 4Institute of Pulmonary Medicine, Center of Excellence for Interstitial Lung Diseases, Tel Aviv Sourasky University Medical Center, Tel Aviv, Israel
Abstract
Purpose: Defects in components of the CDC45–MCM2-7–GINS (CMG) helicase complex have been associated with natural killer (NK) cell deficiency in rare inborn errors of immunity. Pathogenic biallelic variants in MCM10 have been reported in a limited number of individuals with severe immunologic and developmental phenotypes. We aimed to further delineate the clinical and immunologic spectrum of MCM10 deficiency.
Methods: Singleton exome sequencing, RNA splicing analysis, flow cytometry–based immunophenotyping, telomere length assessment, radiation sensitivity testing, and in silico analysis of publicly available single-cell RNA sequencing datasets were performed.
Results: A six-year-old boy presented with poikiloderma, photosensitivity, growth failure, and immune dysregulation. Exome sequencing identified a homozygous canonical splice-site variant in MCM10 (c.930 + 2T > A), resulting in an in-frame deletion of 17 amino acids within the oligonucleotide/oligosaccharide-binding (OB)-fold domain, confirmed at the RNA level.Immunophenotyping showed near-absent NK cells with increased NK-T cells and terminally differentiated CD8 T cells. While karyotype, telomere length, and radiation sensitivity were normal, limited MCM10 expression in replicating NK cells is suspected. During follow-up, the patient developed an aggressive Epstein–Barr virus–positive squamous cell carcinoma of the tongue, an exceedingly rare childhood malignancy.
Conclusion: This case expands the phenotypic spectrum of MCM10-related inborn errors of immunity and supports a critical role for MCM10 in NK-cell development and immune homeostasis. The occurrence of a virus-associated malignancy suggests susceptibility and impaired immune surveillance. Together with previously described defects in CMG-complex components, these findings are consistent with an emerging group of DNA replication–associated immune disorders.
Supplementary Information: The online version contains supplementary material available at https://doi.org/10.1007/s10875-026-02045-7.
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BibTeX
@article{hoffman2026biallelic,
title = {{Biallelic MCM10 Deficiency Presenting with Natural Killer Cell Deficiency, Poikiloderma and EBV-Associated Malignancy}},
author = {Yael Hoffman and Alina Kurolap and Hila Ledermann Nahmias and Adi Mory and Tal Freund and Avraham Unterman and Uri Hamiel and Hagit Baris Feldman and Daphna Marom and David Hagin},
journal = {Journal of Clinical Immunology},
year = {2026},
month = jul,
doi = {10.1007/s10875-026-02045-7},
url = {https://doi.org/10.1007/s10875-026-02045-7},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Biallelic MCM10 Deficiency Presenting with Natural Killer Cell Deficiency, Poikiloderma and EBV-Associated Malignancy
AU - Yael Hoffman
AU - Alina Kurolap
AU - Hila Ledermann Nahmias
AU - Adi Mory
AU - Tal Freund
AU - Avraham Unterman
AU - Uri Hamiel
AU - Hagit Baris Feldman
AU - Daphna Marom
AU - David Hagin
PY - 2026
DA - 2026/07/30
JO - Journal of Clinical Immunology
DO - 10.1007/s10875-026-02045-7
UR - https://doi.org/10.1007/s10875-026-02045-7
AB - Purpose: Defects in components of the CDC45–MCM2-7–GINS (CMG) helicase complex have been associated with natural killer (NK) cell deficiency in rare inborn errors of immunity. Pathogenic biallelic variants in MCM10 have been reported in a limited number of individuals with severe immunologic and developmental phenotypes. We aimed to further delineate the clinical and immunologic spectrum of MCM10 deficiency. Methods: Singleton exome sequencing, RNA splicing analysis, flow cytometry–based immunophenotyping, telomere length assessment, radiation sensitivity testing, and in silico analysis of publicly available single-cell RNA sequencing datasets were performed. Results: A six-year-old boy presented with poikiloderma, photosensitivity, growth failure, and immune dysregulation. Exome sequencing identified a homozygous canonical splice-site variant in MCM10 (c.930 + 2T > A), resulting in an in-frame deletion of 17 amino acids within the oligonucleotide/oligosaccharide-binding (OB)-fold domain, confirmed at the RNA level.Immunophenotyping showed near-absent NK cells with increased NK-T cells and terminally differentiated CD8 T cells. While karyotype, telomere length, and radiation sensitivity were normal, limited MCM10 expression in replicating NK cells is suspected. During follow-up, the patient developed an aggressive Epstein–Barr virus–positive squamous cell carcinoma of the tongue, an exceedingly rare childhood malignancy. Conclusion: This case expands the phenotypic spectrum of MCM10-related inborn errors of immunity and supports a critical role for MCM10 in NK-cell development and immune homeostasis. The occurrence of a virus-associated malignancy suggests susceptibility and impaired immune surveillance. Together with previously described defects in CMG-complex components, these findings are consistent with an emerging group of DNA replication–associated immune disorders. Supplementary Information: The online version contains supplementary material available at https://doi.org/10.1007/s10875-026-02045-7.
SN - 0271-9142
SN - 1573-2592
ER -