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Rozevska M, Kanepa A, Purina S, Gailite L, Nartisa I, Farkas H, Rots D, Kurjane N. Hereditary or acquired? Comprehensive genetic testing assists in stratifying angioedema patients. ALLERGY, ASTHMA, AND CLINICAL IMMUNOLOGY : OFFICIAL JOURNAL OF THE CANADIAN SOCIETY OF ALLERGY AND CLINICAL IMMUNOLOGY 2024; 20:28. [PMID: 38555427 PMCID: PMC10981324 DOI: 10.1186/s13223-024-00889-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 03/14/2024] [Indexed: 04/02/2024]
Abstract
Hereditary angioedema (HAE) poses diagnostic challenges due to its episodic, non-specific symptoms and overlapping conditions. This study focuses on the genetic basis of HAE, particularly focusing on unresolved cases and those with normal C1-inhibitor levels (nC1-INH HAE). This study reveals that conventional testing identified pathogenic variants in only 10 patients (n = 32), emphasizing the necessity for an integrative approach using genome, exome, and transcriptome sequencing. Despite extensive genetic analyses, the diagnostic yield for nC1-INH HAE remains low in our study, the pathogenic variant for nC1-INH HAE was identified in only 1 patient (n = 21). Investigation into candidate genes yielded no pathogenic variants, prompting a re-evaluation of patients' diagnoses. This study advocates for a nuanced approach to genetic testing, recognizing its limitations and emphasizing the need for continuous clinical assessment. The complex genetic landscape of nC1-INH HAE necessitates further research for a more comprehensive understanding. In conclusion, this study contributes valuable insights into the genetic intricacies of HAE, highlighting the challenges in diagnosis and the evolving nature of the disease. The findings underscore the importance of advanced sequencing techniques and an integrated diagnostic strategy in unravelling the complexities of HAE, particularly in nС1-INH HAE cases.
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Affiliation(s)
- Marija Rozevska
- Riga Stradiņš University, Riga, Latvia
- Children's clinical university hospital, Riga, Latvia
| | | | - Signe Purina
- Center of Diagnostics and Treatment of Allergic Diseases, Riga, Latvia
| | | | - Inga Nartisa
- Riga Stradiņš University, Riga, Latvia
- Children's clinical university hospital, Riga, Latvia
| | - Henriette Farkas
- Department of Internal Medicine and Haematology, Hungarian Angioedema Center of Reference and Excellence, Semmelweis University, Budapest, Hungary
| | - Dmitrijs Rots
- Riga Stradiņš University, Riga, Latvia
- Children's clinical university hospital, Riga, Latvia
| | - Natalja Kurjane
- Riga Stradiņš University, Riga, Latvia.
- Children's clinical university hospital, Riga, Latvia.
- Pauls Stradiņš Clinical University Hospital, Riga, Latvia.
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Kanepa A, Nartisa I, Rots D, Gailite L, Farkas H, Kurjane N. National survey on clinical and genetic characteristics of patients with hereditary angioedema in Latvia. ALLERGY, ASTHMA, AND CLINICAL IMMUNOLOGY : OFFICIAL JOURNAL OF THE CANADIAN SOCIETY OF ALLERGY AND CLINICAL IMMUNOLOGY 2023; 19:28. [PMID: 37031173 PMCID: PMC10082512 DOI: 10.1186/s13223-023-00783-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 03/12/2023] [Indexed: 04/10/2023]
Abstract
BACKGROUND Hereditary angioedema (HAE) is a rare and life-threatening inborn error of immunity. HAE is mostly caused by pathogenic variations in the serine protease inhibitor gene 1 (SERPING1), leading to deficient or dysfunctional C1-inhibitor (C1-INH), overproduction of bradykinin, and development of recurrent subcutaneous and/or submucosal oedema. The prevalence of HAE is 1 in 50,000 - 100000 people worldwide. We aimed to describe the clinical features and genetic spectrum of hereditary angioedema with C1-INH deficiency (C1-INH-HAE) in Latvia. METHODS All patients from Latvia diagnosed with HAE (types I/II) from 2006 to March 2022 were included in the study. Laboratory tests and clinical data were analysed, and genetic tests with Sanger sequencing and whole genome sequencing were performed. RESULTS The study identified 10 C1-INH-HAE patients (nine females, one male) from eight families. The point prevalence of HAE in Latvia is 0.53 per 100 000 inhabitants. Of all patients, seven (70%) had HAE type I and three (30%) had HAE type II. The median age of patients was 54 years and the median age at onset of symptoms was 15 years. A significant delay (median 20.5 years) until diagnosis was observed, and 60% of patients had a positive family history of angioedema. All HAE patients have been hospitalised a median two times during their lifetime. Skin (100%), abdominal (80%), and airway (80%) oedema were the most frequent symptoms. Triggering factors (60%) and prodromal symptoms (90%) were referred. Attacks were severe in 50% of patients, moderate in 10%, and mild in 40%. Pathogenic variations of SERPING1 were identified in eight patients (six families), confirming the diagnosis molecularly. In two patients (two families), no pathogenic variations in the genes were found even after whole genome sequencing. CONCLUSIONS Current data shows a significant delay and clear underdiagnosis of HAE in Latvia. Higher awareness and better information and communication between doctors would improve the diagnosis and management of HAE; as would screening of family members, patients with recurrent angioedema unresponsive to antihistamines and glucocorticoids, and patients with recurrent episodes of severe, unexplained abdominal pain.
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Affiliation(s)
- Adine Kanepa
- Riga Stradiņš University, Dzirciema Street 16, Riga, LV-1007, Latvia.
| | - Inga Nartisa
- Riga Stradiņš University, Dzirciema Street 16, Riga, LV-1007, Latvia
- Children's Clinical University Hospital, Riga, Latvia
| | - Dmitrijs Rots
- Riga Stradiņš University, Dzirciema Street 16, Riga, LV-1007, Latvia
- Children's Clinical University Hospital, Riga, Latvia
| | - Linda Gailite
- Riga Stradiņš University, Dzirciema Street 16, Riga, LV-1007, Latvia
| | - Henriette Farkas
- Department of Internal Medicine and Haematology, Hungarian Angioedema Center of Reference and Excellence, Semmelweis University, Budapest, Hungary
| | - Natalja Kurjane
- Riga Stradiņš University, Dzirciema Street 16, Riga, LV-1007, Latvia
- Pauls Stradiņš Clinical University Hospital, Riga, Latvia
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Altered Urinary Metabolomics in Hereditary Angioedema. Metabolites 2022; 12:metabo12111140. [PMID: 36422280 PMCID: PMC9696332 DOI: 10.3390/metabo12111140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/08/2022] [Accepted: 11/12/2022] [Indexed: 11/22/2022] Open
Abstract
Hereditary angioedema (HAE) is a rare and potentially life-threatening disease with heterogeneous clinical symptoms. The metabolomic profile of HAE remains unknown. Uncovering the metabolic signatures of HAE may provide inspiration for a comprehensive understanding of HAE pathogenesis and may help explore potential new metabolic biomarkers. We performed a comprehensive metabolic analysis using high-performance liquid chromatography−tandem mass spectrometry (HPLC-MS/MS). Urine samples from 34 HAE patients and 82 healthy controls (HCs) were collected to characterize the metabolic signatures associated with HAE. The metabolomes of HAE patients carrying different mutation types were also compared. A total of 795 metabolites were accurately detected and quantified. We considered 73 metabolites as differential metabolites in HAE patients (with an importance in projection (VIP) value > 1.0, q-value < 0.05, and fold change (FC) ≥ 1.2 or FC ≤ 0.8). Several metabolites associated with riboflavin metabolism, the citrate cycle, oxidative stress, and inflammation, including xanthine, oxypurinol, vitamin B2, and isocitrate, were significantly altered in HAE patients. No significantly different metabolites were found in HAE patients carrying different mutation types. The present study highlights that metabolic disturbances in the purine metabolism, riboflavin metabolism, and TCA cycle may be involved in the pathogenesis of HAE. Although biochemical significance requires further experimental verification, these findings may help to identify novel candidate metabolite biomarkers associated with HAE.
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Wang X, Lei S, Xu Y, Liu S, Zhi Y. Mutation update of SERPING1 related to hereditary angioedema in the Chinese population. Hereditas 2022; 159:28. [PMID: 35821062 PMCID: PMC9277798 DOI: 10.1186/s41065-022-00242-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 06/21/2022] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Hereditary angioedema (HAE) is a rare disease characterized by recurrent attacks of severe swellings of the skin and submucosa. More than 900 variants of the SERPING1 gene associated with HAE have been identified. However, only approximately 50 variants have been identified in the Chinese population. This study aimed to update the mutational spectrum in Chinese HAE patients and provide evidence for the accurate diagnosis of HAE. METHODS A total of 97 unrelated HAE patients were enrolled in the study. Sanger sequencing and multiple ligation-dependent probe amplification analysis were used to identify the variants in the SERPING1 gene. The variants were reviewed in a number of databases, including the Human Gene Mutation Database (HGMD) ( http://www.hgmd.cf.ac.uk/ ) and the Leiden Open Variation Database (LOVD, https://databases.lovd.nl/shared/variants/SERPING1 ). The American College of Medical Genetics and Genomics-Association for Molecular Pathology (ACMG-AMP) criteria was used to determine the pathogenicity of the variants. RESULTS Of the 97 patients, 76 different variants were identified in 90 of them and no disease-causing variants were identified in the remaining 7 patients. Among the 76 variants, 35 variants were novel and submitted to ClinVar. Missense and in-frame variants were the most common variants (36.8%), followed by frameshift (28.9%), nonsense (14.5%), splice site (13.2%) variants, and gross deletions/duplications (6.6%). CONCLUSIONS Our findings broaden the mutational spectrum of SERPING1 and provide evidence for accurate diagnosis and predictive genetic counseling.
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Affiliation(s)
- Xue Wang
- Department of Allergy & Clinical Immunology, National Clinical Research Center for Immunologic Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, #1 Shuaifuyuan, Wangfujing, Beijing, 100730, P.R. China
| | - Shubin Lei
- Eighth-year Program of Clinical Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yingyang Xu
- Department of Allergy & Clinical Immunology, National Clinical Research Center for Immunologic Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, #1 Shuaifuyuan, Wangfujing, Beijing, 100730, P.R. China
| | - Shuang Liu
- Department of Allergy & Clinical Immunology, National Clinical Research Center for Immunologic Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, #1 Shuaifuyuan, Wangfujing, Beijing, 100730, P.R. China
| | - Yuxiang Zhi
- Department of Allergy & Clinical Immunology, National Clinical Research Center for Immunologic Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, #1 Shuaifuyuan, Wangfujing, Beijing, 100730, P.R. China.
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Woon ST, Mayes J, Quach A, Longhurst H, Ferrante A, Ameratunga R. Droplet digital PCR for identifying copy number variations in patients with primary immunodeficiency disorders. Clin Exp Immunol 2022; 207:329-335. [PMID: 35553639 PMCID: PMC9113119 DOI: 10.1093/cei/uxab034] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 12/02/2021] [Accepted: 12/20/2021] [Indexed: 11/14/2022] Open
Abstract
Abstract
Primary immunodeficiency disorders comprise a rare group of mostly monogenic disorders caused by inborn errors of immunity. The majority can be identified by either Sanger sequencing or next generation sequencing. Some disorders result from large insertions or deletions leading to copy number variations (CNVs). Sanger sequencing may not identify these mutations. Here we present droplet digital PCR as an alternative cost-effective diagnostic method to identify CNV in these genes. The data from patients with large deletions of NFKB1, SERPING1, and SH2D1A are presented.
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Affiliation(s)
- See-Tarn Woon
- Department of Virology and Immunology, LabPLUS, Auckland City Hospital, Grafton, Auckland, New Zealand
- Department of Molecular Medicine and Pathology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Julia Mayes
- Department of Virology and Immunology, LabPLUS, Auckland City Hospital, Grafton, Auckland, New Zealand
| | - Alexander Quach
- SA Pathology at the Women’s & Children’s Hospital, Immunopathology Department, North Adelaide, South Australia, Australia
| | - Hilary Longhurst
- Department of Clinical Immunology, Auckland City Hospital, Grafton, Auckland, New Zealand
- Department of Medicine, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Antonio Ferrante
- SA Pathology at the Women’s & Children’s Hospital, Immunopathology Department, North Adelaide, South Australia, Australia
| | - Rohan Ameratunga
- Department of Virology and Immunology, LabPLUS, Auckland City Hospital, Grafton, Auckland, New Zealand
- Department of Molecular Medicine and Pathology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
- Department of Clinical Immunology, Auckland City Hospital, Grafton, Auckland, New Zealand
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Drouet C, López-Lera A, Ghannam A, López-Trascasa M, Cichon S, Ponard D, Parsopoulou F, Grombirikova H, Freiberger T, Rijavec M, Veronez CL, Pesquero JB, Germenis AE. SERPING1 Variants and C1-INH Biological Function: A Close Relationship With C1-INH-HAE. FRONTIERS IN ALLERGY 2022; 3:835503. [PMID: 35958943 PMCID: PMC9361472 DOI: 10.3389/falgy.2022.835503] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 02/16/2022] [Indexed: 11/13/2022] Open
Abstract
Hereditary angioedema with C1 Inhibitor deficiency (C1-INH-HAE) is caused by a constellation of variants of the SERPING1 gene (n = 809; 1,494 pedigrees), accounting for 86.8% of HAE families, showing a pronounced mutagenic liability of SERPING1 and pertaining to 5.6% de novo variants. C1-INH is the major control serpin of the kallikrein–kinin system (KKS). In addition, C1-INH controls complement C1 and plasminogen activation, both systems contributing to inflammation. Recognizing the failed control of C1s protease or KKS provides the diagnosis of C1-INH-HAE. SERPING1 variants usually behave in an autosomal-dominant character with an incomplete penetrance and a low prevalence. A great majority of variants (809/893; 90.5%) that were introduced into online database have been considered as pathogenic/likely pathogenic. Haploinsufficiency is a common feature in C1-INH-HAE where a dominant-negative variant product impacts the wild-type allele and renders it inactive. Small (36.2%) and large (8.3%) deletions/duplications are common, with exon 4 as the most affected one. Point substitutions with missense variants (32.2%) are of interest for the serpin structure–function relationship. Canonical splice sites can be affected by variants within introns and exons also (14.3%). For noncanonical sequences, exon skipping has been confirmed by splicing analyses of patients' blood-derived RNAs (n = 25). Exonic variants (n = 6) can affect exon splicing. Rare deep-intron variants (n = 6), putatively acting as pseudo-exon activating mutations, have been characterized as pathogenic. Some variants have been characterized as benign/likely benign/of uncertain significance (n = 74). This category includes some homozygous (n = 10) or compound heterozygous variants (n = 11). They are presenting with minor allele frequency (MAF) below 0.00002 (i.e., lower than C1-INH-HAE frequency), and may be quantitatively unable to cause haploinsufficiency. Rare benign variants could contribute as disease modifiers. Gonadal mosaicism in C1-INH-HAE is rare and must be distinguished from a de novo variant. Situations with paternal or maternal disomy have been recorded (n = 3). Genotypes must be interpreted with biological investigation fitting with C1-INH expression and typing. Any SERPING1 variant reminiscent of the dysfunctional phenotype of serpin with multimerization or latency should be identified as serpinopathy.
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Affiliation(s)
- Christian Drouet
- Department of Infection, Immunity and Inflammation, Institut Cochin, INSERM UMR1016, Université de Paris, Paris, France
- Univ. Grenoble-Alpes & Centre Hospitalier Universitaire de Grenoble, Grenoble, France
- *Correspondence: Christian Drouet
| | - Alberto López-Lera
- Hospital La Paz Institute for Health Research (IdiPAZ), CIBERER U-754, Madrid, Spain
| | | | - Margarita López-Trascasa
- Hospital La Paz Institute for Health Research (IdiPAZ), Universidad Autónoma de Madrid, Madrid, Spain
| | - Sven Cichon
- Human Genomics Research Group, Department of Biomedicine, University of Basel, Basel, Switzerland
- Institute of Medical Genetics and Pathology, University Hospital Basel, Basel, Switzerland
| | - Denise Ponard
- Centre Hospitalier Universitaire de Grenoble, Grenoble, France
| | | | - Hana Grombirikova
- Molecular Genetics Laboratory, Centre for Cardiovascular Surgery and Transplantation Brno and Medical Faculty, Masaryk University, Brno, Czechia
| | - Tomáš Freiberger
- Molecular Genetics Laboratory, Centre for Cardiovascular Surgery and Transplantation Brno and Medical Faculty, Masaryk University, Brno, Czechia
| | - Matija Rijavec
- University Clinic of Respiratory and Allergic Diseases Golnik, Golnik, Slovenia
| | - Camila L. Veronez
- Department of Biophysics, Centre for Research and Genetic Diagnosis of Genetic Diseases, Federal University of São Paolo, São Paolo, Brazil
| | - João Bosco Pesquero
- Department of Biophysics, Centre for Research and Genetic Diagnosis of Genetic Diseases, Federal University of São Paolo, São Paolo, Brazil
| | - Anastasios E. Germenis
- CeMIA SA, Larissa, Greece
- Department of Immunology & Histocompatibility, School of Health Sciences, Faculty of Medicine, University of Thessaly, Larissa, Greece
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