Defective neutrophil development and specific granule deficiency caused by a homozygous splice-site mutation in SMARCD2 - 03/06/21
Abstract |
Background |
SMARCD2 (SWI/SNF-related, matrix-associated, actin-dependent regulator of chromatin, subfamily D, member 2) has recently been shown to have a critical role in granulopoiesis in humans, mice, and zebrafish. Our patient presented with delayed cord separation, failure to thrive, and sepsis. Retrospective whole-exome sequencing confirmed a homozygous splice-site mutation in SMARCD2.
Objective |
We sought to provide the second description of human SMARCD2 deficiency and the first functional analysis of human primary SMARCD2-deficient cells.
Methods |
Heparinized venous blood and bone marrow were collected from the patient after obtaining informed consent. Patient leukocytes and CD34+ cells were then isolated, phenotyped, and assessed functionally.
Results |
Circulating neutrophils appeared phenotypically immature, lacking multilobed nuclei, and neutrophil granules lacked lactoferrin but showed normal levels of myeloperoxidase. Neutrophil oxidative burst was preserved in response to phorbol 12-myristate 13-acetate. Patient bone marrow–derived neutrophils and white blood cells showed a severely impaired chemotactic response. Furthermore, white blood cells showed defective in vitro killing of Staphylococcus aureus, consistent with a specific granule deficiency. Finally, patient bone marrow–derived CD34+ cells showed markedly impaired in vitro expansion and differentiation toward the neutrophil lineage. Before her molecular diagnosis, our patient underwent hematopoietic stem cell transplantation and is well 8 years later.
Conclusions |
This report highlights an important role for SMARCD2 in human myelopoiesis and the curative effect of hematopoietic stem cell transplantation for the hematopoietic features of SMARCD2 deficiency.
Le texte complet de cet article est disponible en PDF.Key words : Splice-site mutation, CEBPε, lactoferrin, chemotaxis, neutrophil-specific granule deficiency, phagocyte disorder, inborn error of immunity
Abbreviations used : CEBPε, SGD, SMARCD2
Plan
| Work in the Primary Immunodeficiency Group was supported by the Medical Research Council, the Sir Jules Thorn Trust (grant no. 12/JTA) and Wellcome (grant no. 207556_Z_17_Z). E.G.G.S. and T.W.K. were funded in part by the European Union’s Horizon 2020 research and innovation program (grant agreement no. 668303), and T.W.K. was funded in part by the Center of Immunodeficiencies Amsterdam (grant no. CIDA-2015). I.S.v.d.L. is supported by an academic clinical fellowship from the National Institute for Health Research. |
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| Disclosure of potential conflict of interest: The authors declare that they have no relevant conflicts of interest. |
Vol 147 - N° 6
P. 2381 - juin 2021 Retour au numéro
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