Early-Onset Juvenile SLE Associated With a Novel Mutation in Protein C δ Sira Nanthapisal, MD,a Ebun Omoyinmi, PhD,a Claire Murphy, MBiolSci, MSc,a Ariane Standing, PhD,a Michael Eisenhut, MD, FRCPCH, FRCP,b Despina Eleftheriou, MBBS, PhD,a Paul A. Brogan, MB, ChB, PhDa

Juvenile systemic lupus erythematosus (jSLE) is rare before 5 years of abstract age. Monogenic causes are suspected in cases of very early onset jSLE particularly in the context of a family history and/or consanguinity. We performed whole-exome sequencing and homozygosity mapping in the siblings presented with early-onset jSLE. A novel homozygous missense mutation in delta (c.1294G>T; p.Gly432Trp) was identified in both patients. One patient showed a marked clinical response and a Infection, Infl ammation, and Rheumatology Section, resolution inflammation with rituximab therapy. This report demonstrates Infection, Immunity, Infl ammation and Physiological the clinical importance of identifying monogenic causes of rare disease to Medicine Programme, UCL Institute of Child Health, London, United Kingdom; bLuton & Dunstable University Hospital provide a definitive diagnosis, help rationalize treatment, and facilitate NHS Foundation Trust, Luton, United Kingdom genetic counseling. Dr Nanthapisal designed the study, carried out the analyses, and drafted the initial manuscript; Dr Omoyinmi, Ms Murphy, and Dr Standing Systemic lupus erythematosus (SLE) rash affecting the scalp, and a coordinated and supervised data analyses and is a complex, severe, chronic, and photosensitive malar rash ( Fig 1A). reviewed and revised the manuscript; Dr Eisenhut coordinated data collection and reviewed the sometimes life-threatening disease. She also had hepatosplenomegaly manuscript; Dr Eleftheriou and Prof Brogan Many factors contribute to the and bruising of the skin ( Fig 1B) and conceptualized and designed the study and critically development of juvenile SLE (jSLE), erythematous, nonpruritic, vasculitic reviewed and revised the manuscript; and all authors including genetics, immune dysfunction, rash affecting the hands and feet approved the fi nal manuscript as submitted. and environmental factors. 1 jSLE is (Fig 1 C and D). Oral mucosa was DOI: 10.1542/peds.2016-0781 rare before 5 years of age, and where normal. Other features were mild Accepted for publication Sep 6, 2016 this occurs monogenic causes should monoarthritis of the knee for >2 Address correspondence to Sira Nanthapisal, MD, be considered, particularly if there is a months (clinically not typical of septic Room 646 UCL Institute of Child Health, 30 Guilford family history of SLE or consanguinity. arthritis and hence joint not aspirated) St, London, United Kingdom. E-mail: s.nanthapisal@ There is now an ever-expanding list of and an episode of acute onset of ucl.ac.uk monogenic causes of SLE (Table 1), and fever, epistaxis, rectal bleeding, and PEDIATRICS (ISSN Numbers: Print, 0031-4005; Online, many present very early in life.2 – 6 We pancytopenia (hemoglobin 10 g/L, 1098-4275). describe 2 siblings who presented with white blood cells 3060 cells per Copyright © 2017 by the American Academy of early-onset jSLE in whom we identified milliliter, neutrophil count 1540 cells Pediatrics a homozygous missense mutation in the per milliliter, lymphocyte count 1010 FINANCIAL DISCLOSURE: The authors have PRKCD . This report demonstrates cells per milliliter, platelet count indicated they have no fi nancial relationships the clinical importance of identifying 87 200 cells per milliliter) at the age relevant to this article to disclose. monogenic causes of rare disease to of 3 years. Additional investigations FUNDING: Rosetrees Trust PhD studentship grant. provide a rapid and definitive diagnosis, showed elevated inflammatory POTENTIAL CONFLICT OF INTEREST: The authors help rationalize treatment, and facilitate markers (elevated erythrocyte have indicated they have no potential confl icts of genetic counseling. sedimentation rate 125 mm/hour interest to disclose. and C-reactive protein 30 mg/L), positive antinuclear antibody To cite: Nanthapisal S, Omoyinmi E, Murphy C, CASE 1:320, anti–double stranded DNA et al. Early-Onset Juvenile SLE Associated With a δ The index case presented at the age at 37 (normal < 10), and positive Novel Mutation in Protein Kinase C . Pediatrics. 2017;139(1):e20160781 of 12 months with scarring alopecia, anti–extractable nuclear antigens

Downloaded from www.aappublications.org/news by guest on October 1, 2021 PEDIATRICS Volume 139 , number 1 , January 2017 :e 20160781 CASE REPORT TABLE 1 Monogenic Causes of SLE Gene Inheritance Clinical Features Onset of SLE SLE or SLE-like Features Specifi c Treatmenta Ref. Nos. or SLE-like Features, y Complement 1–40 Fresh-frozen 6 – 9 cascade plasma, C1QA 1p.36.12 AR SLE, ICD, RI Mucocutaneous and renal hematopoietic C1QB 1p36.12 AR SLE, ICD, RI involvement, positive ANA, anti- stem cell C1QC 1p.36.11 AR SLE, ICD, RI dsDNA, extractable nuclear transplant antigen antibodies, increased cardiovascular risk C1R 12p13 AR SLE, ICD, RI <1 Mucocutaneous, neurologic, and —10 renal involvement C1S 12p13 AR SLE, ICD, RI <1 Mucocutaneous and renal — 11,12 involvement, autoimmune thyroiditis, autoimmune hepatitis C2 6p21.3 AR SLE, RI, undifferentiated >10 Mucocutaneous, hematologic, — 1,13 –15 connective tissue disease, and renal involvement, vasculitis, Sjögren arthritis syndrome C4 6p21.3 AR SLE, ICD, RI, rheumatoid 2–40 Mucocutaneous, hematologic, —16 arthritis and renal involvement, vasculitis TREX1 3p21.31 AD SLE, familial chilblain lupus, 4–adulthood Cold-induced chilblain lupus, —17 – 19 retinal vasculopathy with photosensitive rash, cerebral leukodystrophy hematologic and neurologic involvement, arthralgia or arthritis AR AGS1 <1 Cold-induced chilblain lupus RNASAH2A 19p13 AR AGS4 <1 Cold-induced chilblain lupus — 18,19 RNASAH2B 13q14 AR AGS2 <1 Cold-induced chilblain lupus — 18,19 RNASAH2C 11q13 AR AGS3 <1 Cold-induced chilblain lupus — 18,19 SAMHD1 20q11 AR AGS5 <1 Cold-induced chilblain lupus — 18,19 AD Familial chilblain lupus Cold-induced chilblain lupus 20 ADAR 1q21.3 AR AGS6 <1 Cold-induced chilblain lupus — 21 DNASE1 16p13.3 AD Sporadic SLE 9–13 Systemic lupus, Sjögren —5 syndrome, high ANA DNASE1L3 3p14.3 AR Familial SLE 2–12 Mucocutaneous and renal —2 2 involvement, positive ANCA, and anticardiolipin antibodies PRKCD 3p21.31 AR Familial SLE <5 Cutaneous vasculitis, hematologic —2 3 involvement, positive ANA and dsDNA antibodies ACP5 19p13.2 AR Spondyloenchondrodysplasia, <1–15 Hematological and renal —2 4 skeletal dysplasia, delayed involvement, positive ANA development, intracranial calcifi cation, immune dysregulation SLC7A7 14q11.2 Lysinuric protein intolerance >10 Renal involvement, vasculitis, — 25,26 with some cases of SLE hemophagocytic lymphohistiocytosis IFIH1 2q24.2 AD SLE with immunoglobulin 6–12 Arthritis, cutaneous vasculitis, —4 A defi ciency, RI, limb hematologic involvement, spasticity positive ANA and dsDNA antibodies, secondary antiphospholipid syndrome TMEM173 5q31.2 AD Familial SLE 2–20 Arthritis, cutaneous vasculitis, —27 hematologic and pulmonary involvement, positive ANA AD, autosomal dominant; AGS, Aicardi–Goutières syndrome; ANA, antinuclear antibody; ANCA, antineutrophil cytoplasmic antibody; AR, autosomal recessive; dsDNA, double-stranded DNA; ICD, immune complex disease; RI, recurrent infection. a All reported treatments described are case reports.

Downloaded from www.aappublications.org/news by guest on October 1, 2021 e2 NANTHAPISAL et al repeated 2 weeks later) was given to the index case, which resulted in a rapid and sustained (13 months at the time of writing) clinical improvement, with complete normalization of the full blood count and normalization of inflammatory markers. Rituximab (at the same dosage) was then given to the older sibling, who unfortunately developed anaphylaxis during the second infusion, although still B-cell depleted successfully, and remains in clinical remission 12 months later.

WORKUP FOR SUSPECTED MONOGENIC SLE All experimental work was FIGURE 1 performed with ethical approval A, A 3-year-old with early-onset jSLE caused by homozygous mutation of PRKCD manifesting with alopecia and rash affecting the scalp and face, with sparing of the nasolabial folds. B, Hepatosplenomegaly (ethics number 08H071382) and and bruising from thrombocytopenia. C, D, Erythematous, nonpruritic, vasculitic rash affecting the with written informed consent palms and soles. from all participants. Both patients were screened via conventional Sanger sequencing for known (ribonucleoprotein, Smith and of pancytopenia or other organ monogenic causes of SLE for TREX1, ribosomal P protein). Complement involvement. SAMHD1, C1qA, C1qB, and C1qC, assays were normal: C1q 42 mg/L Both siblings were received a all of which were negative (wild- (normal range 50–250 mg/L), diagnosis of familial SLE, with type). Homozygosity mapping C3 0.66 g/L (normal range 0.75– fulfillment of 6 out of 11 of the was therefore performed in both 1.65 g/L), C4 0.1 g/L (normal range American College of Rheumatology patients and both parents (see 0.14–0.54 g/L); functional classic classification criteria: malar Supplemental Materials). Whole- complement pathway assay activity rash, photosensitivity, arthritis, exome sequencing (WES) was was 75% (normal > 40%), and hematologic disorder, immunologic subsequently performed only in functional alternative complement disorder, and positive antinuclear the index case (see Supplemental pathway assay activity was 99% antibody. 28 Both patients were Materials). These studies revealed (normal > 10%). Renal function and initially treated in the first instance a homozygous missense mutation transaminase levels were entirely with pulse methylprednisolone (c.1294G>T; p.Gly432Trp) in normal. (30 mg/kg for 3 days followed by the PRKCD in the index case (see The pedigree of the family is shown oral prednisolone 2 mg/kg per day), Supplemental Materials for more in Fig 2A. She was the second child hydroxychloroquine (5 mg/kg details), subsequently confirmed via of consanguineous parents (first per day), and azathioprine (2 mg/kg Sanger sequencing. The c.1294G>T cousins once removed, ie, the father per day). However, over the substitution is a novel mutation not was the child of the mother’s first next 6 months both children yet annotated in the single nucleotide cousin) originally from Pakistan. progressively deteriorated with polymorphism database, the ClinSeq The 5-year-old sister of the index pancytopenia, with a platelet count database, 29 6500ESP, 30 or the 1000 case had identical symptoms and in the range of 60 000 to 84 000 Genomes Project databases. 31 This signs, which started at the age cells per milliliter. Both siblings homozygous c.1294G>T mutation of 12 months. Her parents were demonstrated only a transient was also confirmed in her affected initially healthy, although the response to additional pulses of sister via Sanger sequencing ( Fig 2B). mother subsequently developed intravenous methylprednisolone and Her currently asymptomatic 1-year- SLE during her third pregnancy. It intravenous immunoglobulin (2 g/kg, old brother was also homozygous manifested as mild cutaneous malar for persistent thrombocytopenia). for the same mutation. As expected, rash and arthralgia but no evidence Therefore, rituximab (750 mg/m2, both parents were confirmed to be

Downloaded from www.aappublications.org/news by guest on October 1, 2021 PEDIATRICS Volume 139 , number 1 , January 2017 e3 FIGURE 2 A, Pedigree of the family. The index case is V-2; the affected sister is V-1. B, Sanger sequencing chromatogram of PRKCD at position c.1294 (in the red- dashed box). The reference base in wild type is G shown above the chromatogram. The chromatogram shows a heterozygous pattern with 2 peaks of T and G in parents, and a homozygous T in patient, affected sister, and unaffected brother. (T is red and G is black.) heterozygous carriers of the same 349 and 603.36 Thus, this mutation transfected lymphoblastoid cell mutation. is likely to cause a loss of function lines were found to be resistant to of the kinase activity of PKCδ. The , reversible by coexpression p.Gly432Trp mutation is predicted of nonmutant protein. In the Belot DISCUSSION to be deleterious in pathogenicity study, primary B cells from patients prediction algorithms (Supplemental and heterozygous carriers also PRKCD is located on Table 2). One limitation of our study exhibited a higher proliferation 3p21.31. It encodes protein kinase was that we did not perform any rate than wild-type individuals C δ (PKCδ), a member of serine/ functional experiments to assess after stimulation of the B-cell threonine kinase family that plays a protein expression or function or receptor, CD40, and Toll-like role in apoptosis and proliferation detailed immunotyping (for receptor 9 compared with wild-type of cells. 32 PKCδ is also known to play various practical reasons, including B cells. a role in B-cell negative selection 33 limited access to clinical samples). and has been shown to prevent However, we suggest that the Rituximab, a monoclonal antibody proliferation of B and T cells in clinical features are explained by the against CD20 present on pre-B response to stimulation in the mutations we identified in PRKCD, and mature B lymphocytes, was mouse model. 34 PKCδ-deficient mice particularly because WES did not (fortuitously) the optimal therapeutic were found to have features of SLE identify any other plausible genetic drug of choice in these patients including anti–double strand DNA cause. because of the possible immunologic autoantibodies, glomerulonephritis defects in B cells caused by the with immunoglobulin G containing Mutation of PRKCD (p.Gly510Ser) mutation in PRKCD. Because 1 sibling immune complex deposition, and has previously been identified developed anaphylaxis to rituximab, lymphocyte infiltration in multiple as the cause of early-onset jSLE other B-cell targeted therapies such organs. 34, 35 by Belot et al 23 in 3 children of as ofatumumab (an alternative fully consanguineous unions. Mutations humanized monoclonal antibody The p.Gly432Trp mutation affects identified were shown to cause against CD20) 37 or belimumab the protein kinase activity domain, reduction of PKCδ expression (a fully humanized monoclonal which is located between amino acid and phosphorylation activity, and antibody against B-lymphocyte

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Downloaded from www.aappublications.org/news by guest on October 1, 2021 Early-Onset Juvenile SLE Associated With a Novel Mutation in Protein Kinase C δ Sira Nanthapisal, Ebun Omoyinmi, Claire Murphy, Ariane Standing, Michael Eisenhut, Despina Eleftheriou and Paul A. Brogan Pediatrics originally published online December 21, 2016;

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