PMID- 31994322 OWN - NLM STAT- MEDLINE DCOM- 20200629 LR - 20200629 IS - 1545-5017 (Electronic) IS - 1545-5009 (Linking) VI - 67 IP - 4 DP - 2020 Apr TI - Diagnostic challenges for a novel SH2D1A mutation associated with X-linked lymphoproliferative disease. PG - e28184 LID - 10.1002/pbc.28184 [doi] AB - Mutations in SH2D1A, encoding the intracellular adaptor signaling lymphocyte activation molecule associated protein (SAP), are associated with X-linked lymphoproliferative disease type 1 (XLP1). We identified a novel hemizygous SH2D1A c.49G > A (p.E17K) variant in a 21-year-old patient with fatal Epstein-Barr virus infection-associated hemophagocytic lymphohistiocytosis. Cellular and biochemical assays revealed normal expression of the SAP variant protein, yet binding to phosphorylated CD244 receptor was reduced by >95%. Three healthy brothers carried the SH2D1A c.49G > A variant. Thus, data suggest that this variant represents a pathogenic mutation, but with variable expressivity. Importantly, our results highlight challenges in the clinical interpretation of SH2D1A variants and caution in using functional flow cytometry assays for the diagnosis of XLP1. CI - (c) 2020 The Authors. Pediatric Blood & Cancer published by Wiley Periodicals, Inc. FAU - Torralba-Raga, Lamberto AU - Torralba-Raga L AD - Department of Medicine, Centre for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden. FAU - Tesi, Bianca AU - Tesi B AD - Clinical Genetics, Karolinska University Hospital Solna, Stockholm, Sweden. AD - Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden. FAU - Chiang, Samuel C C AU - Chiang SCC AD - Department of Medicine, Centre for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden. FAU - Schlums, Heinrich AU - Schlums H AD - Department of Medicine, Centre for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden. FAU - Nordenskjold, Magnus AU - Nordenskjold M AD - Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden. FAU - Horne, AnnaCarin AU - Horne A AD - Department of Women's and Children's Health, Karolinska University Hospital, Stockholm, Sweden. AD - Paediatric Rheumatology Department, Karolinska University Hospital, Stockholm, Sweden. FAU - Henter, Jan-Inge AU - Henter JI AD - Clinical Genetics, Karolinska University Hospital Solna, Stockholm, Sweden. FAU - Meeths, Marie AU - Meeths M AD - Clinical Genetics, Karolinska University Hospital Solna, Stockholm, Sweden. AD - Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden. FAU - Abdelhaleem, Mohamed AU - Abdelhaleem M AD - Department of Paediatric Laboratory Medicine, Hospital for Sick Children, Toronto, Canada. FAU - Weitzman, Sheila AU - Weitzman S AD - Division of Pediatric Hematology/Oncology, The Hospital for Sick Children and the University of Toronto, Toronto, Canada. FAU - Bryceson, Yenan AU - Bryceson Y AUID- ORCID: 0000-0002-7783-9934 AD - Department of Medicine, Centre for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden. AD - Broegelmann Research Laboratory, Institute of Clinical Sciences, University of Bergen, Bergen, Norway. LA - eng GR - 311335/ERC_/European Research Council/International PT - Case Reports PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20200129 PL - United States TA - Pediatr Blood Cancer JT - Pediatric blood & cancer JID - 101186624 RN - 0 (CD244 protein, human) RN - 0 (Neoplasm Proteins) RN - 0 (SH2D1A protein, human) RN - 0 (Signaling Lymphocytic Activation Molecule Associated Protein) RN - 0 (Signaling Lymphocytic Activation Molecule Family) SB - IM MH - Adult MH - Amino Acid Substitution MH - *Epstein-Barr Virus Infections/genetics/metabolism MH - Fatal Outcome MH - Gene Expression Regulation, Leukemic MH - *Hemizygote MH - *Herpesvirus 4, Human/genetics/metabolism MH - Humans MH - *Lymphohistiocytosis, Hemophagocytic/genetics/metabolism/virology MH - *Lymphoproliferative Disorders/genetics/metabolism/virology MH - Male MH - *Mutation, Missense MH - *Neoplasm Proteins/genetics/metabolism MH - *Signaling Lymphocytic Activation Molecule Associated Protein/biosynthesis/genetics MH - Signaling Lymphocytic Activation Molecule Family/genetics OTO - NOTNLM OT - ITSM OT - NK cells OT - SAP OT - X-linked lymphoproliferative disease OT - diagnostic assays OT - hemophagocytic lymphohistiocytosis EDAT- 2020/01/30 06:00 MHDA- 2020/07/01 06:00 CRDT- 2020/01/30 06:00 PHST- 2019/06/13 00:00 [received] PHST- 2019/12/19 00:00 [revised] PHST- 2019/12/27 00:00 [accepted] PHST- 2020/01/30 06:00 [pubmed] PHST- 2020/07/01 06:00 [medline] PHST- 2020/01/30 06:00 [entrez] AID - 10.1002/pbc.28184 [doi] PST - ppublish SO - Pediatr Blood Cancer. 2020 Apr;67(4):e28184. doi: 10.1002/pbc.28184. Epub 2020 Jan 29.