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A Variety of Alu-Mediated Copy Number Variations Can Underlie IL-12Rβ1 Deficiency

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Abstract

Purpose

Inborn errors of IFN-γ immunity underlie Mendelian susceptibility to mycobacterial disease (MSMD). Autosomal recessive complete IL-12Rβ1 deficiency is the most frequent genetic etiology of MSMD. Only two of the 84 known mutations are copy number variations (CNVs), identified in two of the 213 IL-12Rβ1-deficient patients and two of the 164 kindreds reported. These two CNVs are large deletions found in the heterozygous or homozygous state. We searched for novel families with IL-12Rβ1 deficiency due to CNVs.

Methods

We studied six MSMD patients from five unrelated kindreds displaying adverse reactions to BCG vaccination. Three of the patients also presented systemic salmonellosis, two had mucocutaneous candidiasis, and one had disseminated histoplasmosis. We searched for CNVs and other variations by IL12RB1-targeted next-generation sequencing (NGS).

Results

We identified six new IL-12Rβ1-deficient patients with a complete loss of IL-12Rβ1 expression on phytohemagglutinin-activated T cells and/or EBV-transformed B cells. The cells of these patients did not respond to IL-12 and IL-23. Five different CNVs encompassing IL12RB1 (four deletions and one duplication) were identified in these patients by NGS coverage analysis, either in the homozygous state (n = 1) or in trans (n = 4) with a single-nucleotide variation (n = 3) or a small indel (n = 1). Seven of the nine mutations are novel. Interestingly, four of the five CNVs were predicted to be driven by nearby Alu elements, as well as the two previously reported large deletions. The IL12RB1 locus is actually enriched in Alu elements (44.7%), when compared with the rest of the genome (10.5%).

Conclusion

The IL12RB1 locus is Alu-enriched and therefore prone to rearrangements at various positions. CNVs should be considered in the genetic diagnosis of IL-12Rβ1 deficiency.

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Acknowledgments

We thank the patients and their families for their collaboration, both branches of the Laboratory of Human Genetics of Infectious Diseases for their helpful discussions and support, and Yelena Nemirovskaya, Catherine Heitz, Céline Desvallées, Cécile Patissier, and Dominick Papandrea for their administrative support.

Funding

The Laboratory of Human Genetics of Infectious Diseases is supported by the National Institute of Allergy and Infectious Diseases (grant number 5R37AI095983), the Rockefeller University, the St. Giles Foundation, Institut National de la Santé et de la Recherche Médicale (INSERM), Paris Descartes University, the Integrative Biology of Emerging Infectious Diseases Laboratory of Excellence (ANR-10-LABX-62-IBEID), and the French National Research Agency under the “Investments for the future” program (grant number ANR-10-IAHU-01), ANR-GENMSMD (ANR-16-CE17-0005-01 for J.B.), and ANR-HGDIFD (ANR-14-CE15-006-01 for A.P.). C.O.-Q. is supported by ANR-14-CE15-006-01. A.N.-P. was supported by CONACYT National PhD Fellowship Program. This study was supported by a Ghent University Special Research Fund (BOF15/GOA/011) grant to E.D.B. H.V. is a Research Foundation Flanders post-doctoral fellow (12R3415N), and E.D.B. is a Research Foundation Flanders senior clinical investigator (1802215N).

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Correspondence to Jacinta Bustamante.

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Informed consent for participation in this study was obtained in accordance with local regulations, with approval from the IRB. The experiments described here were performed in France, in accordance with local regulations, and with the approval of the IRB of Necker Hospital for Sick Children, France.

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Rosain, J., Oleaga-Quintas, C., Deswarte, C. et al. A Variety of Alu-Mediated Copy Number Variations Can Underlie IL-12Rβ1 Deficiency. J Clin Immunol 38, 617–627 (2018). https://doi.org/10.1007/s10875-018-0527-6

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