IL2RG hypomorphic mutation: identification of a novel pathogenic mutation in exon 8 and a review of the literature

• Published in: Allergy, asthma, and clinical immunology asthma, and clinical immunology, 2019-01, Vol.15 (1), p.2-8, Article 2
• Main Authors: Lim, Che Kang, Abolhassani, Hassan, Appelberg, Sofia K, Sundin, Mikael, Hammarström, Lennart
• Format: Article
• Language: English
• Subjects: Age; Analysis; Atypical severe combined immunodeficiency; B cells; Care and treatment; Case Report; Cytokines; Family medical history; Genes; Genetic aspects; Genotype & phenotype; Hypomorphic mutations; Immunodeficiency; Infections; Interleukin 2 receptor gamma; Interleukins; Kinases; Lymphocytes; Medical screening; Medicin och hälsovetenskap; Mutation; Novels; Patients; Pneumonia; Severe combined immunodeficiency
• ISSN: 1710-1484; 1710-1492; 1710-1492
• DOI: 10.1186/s13223-018-0317-y

Atypical X-linked severe combined immunodeficiency (X-SCID) is a variant of cellular immunodeficiency due to hypomorphic mutations in the interleukin 2 receptor gamma ( ) gene. Due to a leaky clinical phenotype, diagnosis and appropriate treatment are challenging in these patients. We report a 16-year-old patient with a T B NK cellular immunodeficiency due to a novel nonsense mutation in exon 8 (p.R328X) of the gene. Functional impairment of the was confirmed by IL2-Janus kinase 3-signal transducer and activator of transcription signaling pathway investigation. In addition, the characteristics of the mutations previously described in 39 patients with an atypical phenotype were reviewed and analyzed from the literature. This is the first report of an atypical X-SCID phenotype due to an exon 8 mutation in the gene. The variability in the phenotypic spectrum of classic X-SCID associated gene highlights the necessity of multi-disciplinary cooperation vigilance for a more accurate diagnostic workup.