Abstract:
:Interleukin-12 receptor deficiency is a well-described cause of human susceptibility to infection with low-virulent mycobacteria and Salmonella species. We identified a male patient presenting in his late forties with severe gastroenteropathy because of outbred infestation by a previously unknown mycobacterium. In addition to selective IgA deficiency, the patient was found to carry a not previously described R283X homozygous mutation in his IL12RΒ1 gene. Two of his sisters, a brother, and his four children were healthy, heterozygous carriers of the mutation. In this patient, the combination of two deficiencies could promote illness. Even though the IgA deficiency in itself does not predispose to mycobacterial disease, the lack of secreted IgA may have disturbed the intestinal homoeostasis and increased the susceptibility to the low-virulent mycobacterium that the patient was not able to clear because of his IL12R deficiency. Antimycobacterial chemotherapy and interferon-γ treatment for 2 years significantly improved his condition. This is the first description of IL12RΒ1 deficiency combined with another immunodeficiency, and we suggest that combinatory defects may circumvent the otherwise low penetrance of IL12RB1 deficiency.
journal_name
Scand J Immunoljournal_title
Scandinavian journal of immunologyauthors
Schejbel L,Rasmussen EM,Kemp HB,Lundstedt AC,Nielsen KR,Obel N,Marquart H,Andersen ABdoi
10.1111/j.1365-3083.2011.02603.xsubject
Has Abstractpub_date
2011-12-01 00:00:00pages
548-53issue
6eissn
0300-9475issn
1365-3083journal_volume
74pub_type
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