title: Cernunnos deficiency: a case report.
abstract: B cell-negative severe combined immunodeficiency (SCID) is caused by molecules involved in the variable (diversity) joining (V[D]J) recombination process. Four genes involved in the nonhomologous end joining pathway--Artemis, DNA-PKcs, DNA ligase 4, and Cernunnos--are involved in B cell-negative radiosensitive SCID. Deficiencies in DNA ligase 4 and the recently described Cernunnos gene result in microcephaly, growth retardation, and typical bird-like facies. Lymphopenia and hypogammaglobulinemia with normal or elevated immunoglobulin (Ig) M levels indicate a defect in V(D)J recombination. We present a case with recurrent postnatal pulmonary infections leading to chronic lung disease, disseminated molluscum contagiosum, lymphopenia, low IgG, IgA and normal IgM levels. Our patient had phenotypic features such as microcephaly and severe growth retardation. Clinical presentation in patients with the B cell-negative subtype ranges from SCID to atypical combined immunodeficiency, occasionally associated with autoimmune manifestations and cytomegalovirus infection. Our patient survived beyond infancy with combined immunodeficiency and no autoimmune manifestations.
authors: Hacettepe University Medical Faculty, Department of Pediatrics, Immunology Unit, Ankara, Turkey.
authors: T
authors: T
authors: Turul
authors: I
authors: I
authors: Tezcan
authors: O
authors: O
authors: Sanal
mesh_terms: D003241:Consanguinity; D004260:DNA Repair; D045643:DNA Repair Enzymes / Q000172:deficiency* / Q000235:genetics; D004268:DNA-Binding Proteins / Q000172:deficiency* / Q000235:genetics; D017809:Fatal Outcome; D005260:Female; D015322:Gene Rearrangement, B-Lymphocyte; D006130:Growth Disorders / Q000235:genetics*; D006801:Humans; D006976:Hypertension, Pulmonary / Q000209:etiology; D016867:Immunocompromised Host; D007223:Infant; D007239:Infections / Q000209:etiology; D018655:Lymphocyte Count; D008831:Microcephaly / Q000235:genetics*; D010641:Phenotype; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications; D012008:Recurrence; D016511:Severe Combined Immunodeficiency / Q000235:genetics* / Q000276:immunology / Q000473:pathology
chemical_list: D004268:DNA-Binding Proteins; C508551:NHEJ1 protein, human; D045643:DNA Repair Enzymes