Cited by 63Immunodeficiency and Autoimmune DisordersT-cell and B-cell ImmunologyInflammasome and immune disorders

PLCG2-associated immune dysregulation (PLAID) comprises broad and distinct clinical presentations related to functional classes of genetic variants

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Baysac, Kathleen, Sun, Guangping, Nakano, Hiroto, Schmitz, Elizabeth G., Cruz, Anthony C., Fisher, Charles, Bailey, Alexis C., Abbott, Jordan K. +88 more·2024·Journal of Allergy and Clinical Immunology

Abstract

Background Pathogenic variants of phospholipase C gamma 2 (PLCG2) cause 2 related forms of autosomal-dominant immune dysregulation (ID), PLCγ2-associated antibody deficiency and immune dysregulation (PLAID) and autoinflammatory PLAID (APLAID). Since describing these conditions, many PLCG2 variants of uncertain significance have been identified by clinical sequencing of patients with diverse features of ID. Objective We sought to functionally classify PLCG2 variants and explore known and novel genotype-function-phenotype relationships. Methods Clinical data from patients with PLCG2 variants were obtained via standardized questionnaire. PLCG2 variants were generated by mutagenesis of enhanced green fluorescent protein (EGFP)-PLCG2 plasmid, which was overexpressed in Plcg2-deficient DT-40 B cells. B-cell receptor-induced calcium flux and extracellular signal-regulated kinase phosphorylation were assayed by flow cytometry. In some cases, stimulation-induced calcium flux was also measured in primary patient cells. Results Three-fourths of PLCG2 variants produced functional alteration of B-cell activation, in vitro. Thirteen variants led to gain of function (GOF); however, most functional variants defined a new class of PLCG2 mutation, monoallelic loss of function (LOF). Susceptibility to infection and autoinflammation were common with both GOF and LOF variants, whereas a new phenotypic cluster consisting of humoral immune deficiency, autoinflammation, susceptibility to herpesvirus infection, and natural killer cell dysfunction was observed in association with multiple heterozygous LOF variants detected in both familial and sporadic cases. In some cases, PLCG2 variants produced greater effects in natural killer cells than in B cells. Conclusions This work expands the genotypic and phenotypic associations with functional variation in PLCG2, including a novel form of ID in carriers of heterozygous loss of PLCG2 function. It also demonstrates the need for more diverse assays for assessing the impact of PLCG2 variants on human disease.

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  • Many mutations discovered in PLCγ2 have been linked to the development of complex immune disorders as well as resistance to ibrutinib treatment in chronic lymphocytic leukaemia.

    “Furthermore, many mutations discovered in PLCγ2 have been linked to the development of complex immune disorders as well as resistance to ibrutinib treatment in chronic lymphocytic leukaemia.”

    From Characterisation of molecular mechanisms for PLCγ2 disease-linked variants (2024) · cites this paper as Baysac et al., 2024

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Authors
Baysac, K., Sun, G., Nakano, H., Schmitz, E. G., Cruz, A. C., Fisher, C., Bailey, A. C., Abbott, J. K., Aldave Becerra, J. C., Allenspach, E. J., Assing, K., Atkinson, T. P., Bargir, U. A., Baxter, S. K., Bergerson, J. R. E., Bista, R., Blanche, S., Buckley, L. M., Butte, M., Carcamo, B., Chandrakala, S., Chen, K., Chervinskiy, S., Chinn, I. K., Chong, H. J., Coffey, K. E., Copland, A. P., Cowen, E. W., Cros, G., De Bruycker, J. J., Teresa de la Morena, M., Ehlayel, M., Forbes Satter, L. R., Gelfand, E. W., Gilliaux, O., Glover, S. C., Gorman, M., Griffin, T. A., Grimbacher, B., Gru, A. A., Haddad, E., Hadjadj, J., Hajjar, J., Hauck, F., Hautala, T., Holland, S. M., Hsieh, E. W. Y., Hsu, F. I., Jacquemin, E., Jindal, A. K., Kahn, S. A., Keller, M. D., Kobayashi, R. H., Krupski, C., Larkin, A., Lawrence, M. G., Madkaikar, M., Malphettes, M., Martelius, T., Mehta, M., Metcalfe, D. D., Meyts, I., Nannapaneni, N., Ocejo Vinyals, J. G., Olivier, K., Ombrello, A. K., Orange, J. S., Rabinovitch, N., Rauscher, C. K., Redfern, A., Reynolds, P. R., Rieux-Laucat, F., Secord, E., Seeborg, F. O., Seppänen, M. R. J., Sereti, I., Shin, D. S., Shin, J. J., Snapper, S. B., Suri, D., Tangcheewinsirikul, S., Thatayatikom, A., Torgerson, T., Touzot, F., Uzel, G., Varjosalo, M., Vasconcelos, D. F. P., von Bernuth, H., Walsh, T., Walter, J. E., Ward, B. R., Wittkowski, H., Wysocki, C. A., Mace, E., Milner, J. D., & Ombrello, M. J.
Affiliations
  • National Institutes of Health (US)
  • Columbia University (US)
Corresponding author
Ombrello, Michael J.
Venue
Journal of Allergy and Clinical Immunology
Publisher
Elsevier BV
Published
2024-01
Volume
153
Issue
1
Pages
230-242
ISSN
0091-6749 (ISSN-L)
OpenAlex
W4387063607
Cited by
63
References
44
Citations by year
2026: 22 · 2025: 28 · 2024: 12 · 2023: 1
FWCI
6.91
Type
journal article
Language
en
Open access
Locations
  • Journal of Allergy and Clinical Immunology (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • FreiDok plus (Universitätsbibliothek Freiburg) (submittedVersion)
Funders
  • National Institute of Allergy and Infectious Diseases
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immunodeficiency and Autoimmune Disorders
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
Keywords
PLCγ2, gain-of-function mutations, loss-of-function mutations, genotype-phenotype correlation, ERK1/2 phosphorylation, NK cell dysfunction, humoral immune deficiency, autoinflammation, antibody deficiency
MeSH terms
Autoimmune Diseases, Calcium, Humans, Immunologic Deficiency Syndromes, Mutation, Phospholipase C gamma

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