A Case of Monogenic Immune Deficiency and Autoimmunity. The Canberra Hospital Immunology Department Dr Phillippa Pucar - Immunology Registrar
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1 A Case of Monogenic Immune Deficiency and Autoimmunity The Canberra Hospital Immunology Department Dr Phillippa Pucar - Immunology Registrar
2 Initial Presentation A 40 year old F was referred for investigation of possible immunodeficiency Background history: Recurrent infections 18/12 recurrent sinopulmonary infections Oral herpes simplex, shingles, oral and vaginal candidiasis Previous history of peripartum Listeria sepsis ITP requiring splenectomy 6 years prior, penicillin prophylaxis Chronic hepatitis B on lamivudine Social History: Migrated from Burma, married with 2 well children Youngest of 9 children Short stature, no other dysmorphic features
3 Initial Investigations Total WCC 12.2x10 9, LC 6.34x10 9 IgG 5.73g/L, IgA 0.43g/L, IgM 0.67g/L Suboptimal antibody responses Tetanus IgG <0.10IU/mL Pneumococcus undetectable for most serotypes
4 CD19 IgM CD19 CD27 IgD CD21 CVID panel Consistent with Freiburg Ia classification Diagnosis of CVID made and commenced on IVIg replacement Responded well to therapy with appropriate trough levels
5 2 Years Later A Further 2 Years Later Recurrent LRTI and exacerbations of bronchiectasis Recurrent herpes zoster infections Reactivation of HBV, started tenofovir Psoriatic arthritis, commenced on sulfasalazine Recurrent groin and skin abscesses Mycobacterium haemophilum isolated,?likely indolent therefore not treated In retrospect, TB therapy in 1989 Recurrent thrombocytopaenia Sulfazalazine stopped as possibly implicated No recovery of platelets Romiplotim administered
6 ANZADA Australia and New Zealand Antibody Deficiency Allele Study WES = 80,000 base calls SNV Homozygous: 0 novel Heterozygous: 60 Nonsense 9152 Missense 220 Novel missense 271 PID genes -> 1 Heterozygous novel missense mutation STAT3 Exon 13 M394>T Filters prevalence, in silico measures of damange (PolyPhen2, Sift, MutationTasker), gene ontogeny, mouse phenotypes, OMIM Centre for Personalised Immunology, JCSMR
7 Mogensen, Int Rev Immunol 2015 O Shea J. NEJM ; 162.
8 Activating Mutations of STAT3 Flanagan. Nat Genet 2014;46(6): different de novo germline mutations identified in highly conserved STAT3 domains 5 patients with early-onset autoimmune disease Early onset diabetes Autoimmune enteropathy Autoimmune interstitial lung disease Juvenile arthritis Primary hypothyroidism Short stature & eczema Reduced Treg numbers
9 Milner. Blood 2015;125(4): individuals, 10 families with early onset autoimmunity + LPD WES 9 germline mutations in STAT3 causing gain of function Lymphadenopathy, autoimmune cytopaenias, multiorgan autoimmunity, infections and short stature Hypogammaglobulinaemia, T cell lymphopaenia & >CD3+CD4-CD8-
10 Haapaniemi. Blood 2015;125(4): patients with activating mutations in STAT3 Immunodeficiency phenotype Hypogammaglobulinaemia with deficiency of switched memory B cells High proportions of CD3+CD4- CD8- Reduced Treg Reduction in Th17 Reduced NK cells Peripheral eosinopaenia Multisystem autoimmunity 1 st described case of M394T described Mild autoimmunity - lymphocytic colitis, ITP, eczema Recurrent LRTIS <LC, <IgG, <memory + swm B cells, >CD21 lo B cells <NK cells, <DCs, <Tregs Disseminated mycobacterial disease IL-12-IFNγ signaling not impaired
11 Summary Germline activating mutations in STAT3 cause dysregulated cytokine signaling, reduction in Treg and altered Th17 This results in autoimmunity and immunodeficiency M394T mutation -> recurrent mycobacterial infections Phenotype is not the opposite of HIES (loss of function) These findings have important implications for the understanding of lymphocyte tolerance and pathogenesis of systemic autoimmunity
12 Acknowledgements Dr Katrina Randall Professor Matthew Cook
13 References O Shea J, Holand S, Staudt L. JAKs and STATs in immunity, immunodeficiency and cancer. NEJM (2): Flanagan S, Haapaniemi E, Russell M et al. Activating germline mutations in STAT3 cause early-onset multi-organ autoimmune disease. Nat Genet 2014;46(6): Milner J, Vogal T, Forbes L et al. early-onset lymphoproliferation and autoimmunity caused by germline STAT3 gain of function mutations. Blood 2015;125(4): Haapaniemi E, Kaustio M, Rajala H et al. Autoimmunity, hypogammaglobulinaemia, lymphoproliferation, and mycobacterial disease in patients with activating mutations in STAT3. Blood 2015;125(4): Mogesen T. Primary immunodeficiencies with elevated IgE. Int Rev Immunol 2015;1-18. O Shea J, Plenge R. JAK and STATs in immunoregulation and immune-mediated disease. Immunity 2012;36(4):
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