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Cernunnos Defect in an Iranian Patient With T− B+ Nk+ Severe Combined Immunodeficiency: A Case Report and Review of the Literature Publisher Pubmed



Jamee M1, 2 ; Khakbazan Fard N2 ; Fallah S2 ; Golchehre Z3 ; Fallahi M2 ; Shamsian BS4 ; Sharafian S2 ; Chavoshzadeh Z2
Authors
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Authors Affiliations
  1. 1. Pediatric Nephrology Research Center, Research Institute for Children’s Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  2. 2. Immunology and Allergy Department, Mofid Children's Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  3. 3. Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Pediatric Congenital Hematologic Disorders Research Center, Research Institute for Children’s Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Source: Molecular Genetics and Genomic Medicine Published:2022


Abstract

Background: Defective Cernunnos gene in nonhomologous end-joining (NHEJ) pathway of the DNA repair is responsible for radiosensitive severe combined immunodeficiency (SCID). Herein, presented a new patient with Cernunnos deficiency and summarized the clinical, immunological, and molecular features of reported patients in the literature. Case: The patient was a 6-month-old female born to consanguineous parents. She presented with long-lasting fever, diarrhea, poor feeding, and restlessness. She had suffered from recurrent fever of unknown origin and multiple episodes of oral candidiasis. In the physical examination, microcephaly, failure to thrive, oral candidiasis, pustular rash on fingers, and perianal ulcers, but no dysmorphic feature were observed. The immunologic workup revealed lymphopenia, neutropenia, normocytic anemia, low T- but normal B- and natural killer (NK)- cells, low immunoglobulin (Ig)G, and normal IgA, IgM, and IgE. The T-cell receptor excision circle (TREC) was low and the lymphocyte transformation test (LTT) was abnormal to mitogens and antigens. She was diagnosed with T− B+ NK+ SCID and improved by intravenous immunoglobulin along with antimicrobials. A homozygous splice site variant, c.390 + 1G > T, at the intron 3 of the NHEJ1, was identified and the diagnosis of Cernunnos deficiency was established. However, while a candidate for hematopoietic stem cell transplantation, she developed sepsis and died at 11 months of age. Conclusions: Cernunnos deficiency should be considered as a differential diagnosis in patients with microcephaly, growth retardation, recurrent infections, T-cell defects, and hypogammaglobulinemia. The normal B-cell level in the index patient is an unexpected finding in Cernunnos deficiency which requires further evaluation. © 2022 The Authors. Molecular Genetics & Genomic Medicine published by Wiley Periodicals LLC.
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