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Xu LL, Zhou XJ, Zhang H. An Update on the Genetics of IgA Nephropathy. J Clin Med 2023; 13:123. [PMID: 38202130 PMCID: PMC10780034 DOI: 10.3390/jcm13010123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/15/2023] [Accepted: 12/22/2023] [Indexed: 01/12/2024] Open
Abstract
Immunoglobulin A (IgA) nephropathy (IgAN), the most common form of glomerulonephritis, is one of the leading causes of end-stage kidney disease (ESKD). It is widely believed that genetic factors play a significant role in the development of IgAN. Previous studies of IgAN have provided important insights to unravel the genetic architecture of IgAN and its potential pathogenic mechanisms. The genome-wide association studies (GWASs) together have identified over 30 risk loci for IgAN, which emphasizes the importance of IgA production and regulation in the pathogenesis of IgAN. Follow-up fine-mapping studies help to elucidate the candidate causal variant and the potential pathogenic molecular pathway and provide new potential therapeutic targets. With the rapid development of next-generation sequencing technologies, linkage studies based on whole-genome sequencing (WGS)/whole-exome sequencing (WES) also identify rare variants associated with IgAN, accounting for some of the missing heritability. The complexity of pathogenesis and phenotypic variability may be better understood by integrating genetics, epigenetics, and environment. We have compiled a review summarizing the latest advancements in genetic studies on IgAN. We similarly summarized relevant studies examining the involvement of epigenetics in the pathogenesis of IgAN. Future directions and challenges in this field are also proposed.
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Affiliation(s)
- Lin-Lin Xu
- Renal Division, Peking University First Hospital, Beijing 100034, China; (L.-L.X.); (H.Z.)
- Kidney Genetics Center, Peking University Institute of Nephrology, Beijing 100034, China
- Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 100034, China
- Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing 100034, China
- Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing 100034, China
- State Key Laboratory of Vascular Homeostasis and Remodeling, Peking University, Beijing 100034, China
| | - Xu-Jie Zhou
- Renal Division, Peking University First Hospital, Beijing 100034, China; (L.-L.X.); (H.Z.)
- Kidney Genetics Center, Peking University Institute of Nephrology, Beijing 100034, China
- Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 100034, China
- Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing 100034, China
- Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing 100034, China
- State Key Laboratory of Vascular Homeostasis and Remodeling, Peking University, Beijing 100034, China
| | - Hong Zhang
- Renal Division, Peking University First Hospital, Beijing 100034, China; (L.-L.X.); (H.Z.)
- Kidney Genetics Center, Peking University Institute of Nephrology, Beijing 100034, China
- Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 100034, China
- Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing 100034, China
- Research Units of Diagnosis and Treatment of Immune-Mediated Kidney Diseases, Chinese Academy of Medical Sciences, Beijing 100034, China
- State Key Laboratory of Vascular Homeostasis and Remodeling, Peking University, Beijing 100034, China
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Lee M, Suzuki H, Nihei Y, Matsuzaki K, Suzuki Y. Ethnicity and IgA nephropathy: worldwide differences in epidemiology, timing of diagnosis, clinical manifestations, management and prognosis. Clin Kidney J 2023; 16:ii1-ii8. [PMID: 38053973 PMCID: PMC10695519 DOI: 10.1093/ckj/sfad199] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Indexed: 12/07/2023] Open
Abstract
Immunoglobulin A nephropathy (IgAN), the most common primary glomerulonephritis, is one of the major causes of end-stage renal disease. Significant variances in epidemiology, clinical manifestation, timing of diagnosis, management and renal prognosis of IgAN have been reported worldwide. The incidence of IgAN is the most frequent in Asia, followed by Europe, and lower in Africa. Moreover, Asian patients show more frequent acute lesions in renal histology and present poorer renal outcomes compared with Caucasians. The comorbidities also show the difference between Asians and Caucasians. Although the frequency of gross hematuria with upper respiratory tract infection is not different, comorbidities with gastrointestinal diseases are reported to be higher in Europe. Recently, genetic studies for variant ethnic patients revealed widely ranging genetic risks in each ethnicity. A genetic risk score is most elevated in Asians, intermediate in Europeans and lowest in Africans, consistent with the disease prevalence of IgAN globally. Ethnic variance might be highly affected by the difference in genetic background. However, it is also essential to mention that the different timing of diagnosis due to variant urinary screening systems and the indication for renal biopsy in different countries may also contribute to these variances. The management of IgAN also varies internationally. Currently, several novel therapies based on the pathogenesis of IgAN are being assessed and are expected to become available soon. Further understanding the ethnic variance of IgAN might help establish individualized care for this disease. Here, we review the issues of ethnic heterogeneities of IgAN.
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Affiliation(s)
- Mingfeng Lee
- Department of Nephrology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Hitoshi Suzuki
- Department of Nephrology, Juntendo University Faculty of Medicine, Tokyo, Japan
- Department of Nephrology, Juntendo University Urayasu Hospital, Chiba, Japan
| | - Yoshihito Nihei
- Department of Nephrology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Keiichi Matsuzaki
- Department of Public Health, Kitasato University School of Medicine, Kanagawa, Japan
| | - Yusuke Suzuki
- Department of Nephrology, Juntendo University Faculty of Medicine, Tokyo, Japan
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Buianova AA, Proskura MV, Cheranev VV, Belova VA, Shmitko AO, Pavlova AS, Vasiliadis IA, Suchalko ON, Rebrikov DV, Petrosyan EK, Korostin DO. Candidate Genes for IgA Nephropathy in Pediatric Patients: Exome-Wide Association Study. Int J Mol Sci 2023; 24:15984. [PMID: 37958966 PMCID: PMC10647220 DOI: 10.3390/ijms242115984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 10/28/2023] [Accepted: 11/03/2023] [Indexed: 11/15/2023] Open
Abstract
IgA nephropathy (IgAN) is an autoimmune disorder which is believed to be non-monogenic. We performed an exome-wide association study of 70 children with IgAN and 637 healthy donors. The HLA allele frequencies were compared between the patients and healthy donors from the bone marrow registry of the Pirogov University. We tested 78,020 gene markers for association and performed functional enrichment analysis and transcription factor binding preference detection. We identified 333 genetic variants, employing three inheritance models. The most significant association with the disorder was observed for rs143409664 (PRAG1) in the case of the additive and dominant models (PBONF = 1.808 × 10-15 and PBONF = 1.654 × 10-15, respectively), and for rs13028230 (UBR3) in the case of the recessive model (PBONF = 1.545 × 10-9). Enrichment analysis indicated the strongly overrepresented "immune system" and "kidney development" terms. The HLA-DQA1*01:01:01G allele (p = 0.0076; OR, 2.021 [95% CI, 1.322-3.048]) was significantly the most frequent among IgAN patients. Here, we characterized, for the first time, the genetic background of Russian IgAN patients, identifying the risk alleles typical of the population. The most important signals were detected in previously undescribed loci.
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Affiliation(s)
- Anastasiia A. Buianova
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Ostrovityanova Str., 1, p. 1, 117513 Moscow, Russia; (V.V.C.); (V.A.B.); (A.O.S.); (A.S.P.); (I.A.V.); (O.N.S.); (D.V.R.); (D.O.K.)
| | - Mariia V. Proskura
- Nephrology Department, Russian Children’s Clinical Hospital, Leninsky Prospect 117, 119571 Moscow, Russia; (M.V.P.); (E.K.P.)
| | - Valery V. Cheranev
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Ostrovityanova Str., 1, p. 1, 117513 Moscow, Russia; (V.V.C.); (V.A.B.); (A.O.S.); (A.S.P.); (I.A.V.); (O.N.S.); (D.V.R.); (D.O.K.)
| | - Vera A. Belova
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Ostrovityanova Str., 1, p. 1, 117513 Moscow, Russia; (V.V.C.); (V.A.B.); (A.O.S.); (A.S.P.); (I.A.V.); (O.N.S.); (D.V.R.); (D.O.K.)
| | - Anna O. Shmitko
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Ostrovityanova Str., 1, p. 1, 117513 Moscow, Russia; (V.V.C.); (V.A.B.); (A.O.S.); (A.S.P.); (I.A.V.); (O.N.S.); (D.V.R.); (D.O.K.)
| | - Anna S. Pavlova
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Ostrovityanova Str., 1, p. 1, 117513 Moscow, Russia; (V.V.C.); (V.A.B.); (A.O.S.); (A.S.P.); (I.A.V.); (O.N.S.); (D.V.R.); (D.O.K.)
| | - Iuliia A. Vasiliadis
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Ostrovityanova Str., 1, p. 1, 117513 Moscow, Russia; (V.V.C.); (V.A.B.); (A.O.S.); (A.S.P.); (I.A.V.); (O.N.S.); (D.V.R.); (D.O.K.)
| | - Oleg N. Suchalko
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Ostrovityanova Str., 1, p. 1, 117513 Moscow, Russia; (V.V.C.); (V.A.B.); (A.O.S.); (A.S.P.); (I.A.V.); (O.N.S.); (D.V.R.); (D.O.K.)
| | - Denis V. Rebrikov
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Ostrovityanova Str., 1, p. 1, 117513 Moscow, Russia; (V.V.C.); (V.A.B.); (A.O.S.); (A.S.P.); (I.A.V.); (O.N.S.); (D.V.R.); (D.O.K.)
| | - Edita K. Petrosyan
- Nephrology Department, Russian Children’s Clinical Hospital, Leninsky Prospect 117, 119571 Moscow, Russia; (M.V.P.); (E.K.P.)
| | - Dmitriy O. Korostin
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Pirogov Russian National Research Medical University, Ostrovityanova Str., 1, p. 1, 117513 Moscow, Russia; (V.V.C.); (V.A.B.); (A.O.S.); (A.S.P.); (I.A.V.); (O.N.S.); (D.V.R.); (D.O.K.)
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Kawasaki Y. Treatment strategy with multidrug therapy and tonsillectomy pulse therapy for childhood-onset severe IgA nephropathy. Clin Exp Nephrol 2022; 26:501-511. [PMID: 35119558 DOI: 10.1007/s10157-022-02187-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 01/20/2022] [Indexed: 11/03/2022]
Abstract
BACKGROUND IgA nephropathy is a typical chronic glomerulonephritis that tends to occur in childhood. METHOD We reviewed the report on pathogenesis, treatment strategy with multidrug therapy and tonsillectomy pulse therapy for childhood-onset severe IgA nephropathy to clarify the pathophysiology and treatment of IgA nephropathy in childhood. RESULTS In recent years, it has been found that the pathogenesis at onset is associated with aberrant glycosylation at the IgA1 hinge. Given this genetic background, the aberrantly glycosylated IgA1immune complex produced by antigen-stimulated T cells and B cells is deposited in the glomeruli. Inflammation is induced via activation of the complement, macrophages and mesangial cells, and glomerular damage progresses thereafter. Treatment is selected according to the severity of IgA nephropathy. In order to prevent the development of renal damage, it is important to control the associated immune responses. For severe IgA nephropathy, in particular, multidrug therapy with prednisolone, immunosuppressants, and angiotensin enzyme synthesis inhibitors and tonsillectomy methylprednisolone pulse therapy are now performed- and, as a result, the number of renal deaths has decreased and the long-term prognosis has improved. CONCLUSION The prognosis of IgA nephropathy is improving. In the future, it will be important to develop a treatment method that takes into consideration the fact that children are in their growth and development stage and, therefore, seeks to minimizes side effects.
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Affiliation(s)
- Yukihiko Kawasaki
- Department of Pediatrics, Fukushima General Rehabilitation Center, Uenodai 4-1, Tomita Cho, Koriyama City, Fukushima Prefecture, 963-8041, Japan.
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Cambier A, Robert T, Hogan J, Rabant M, Peuchmaur M, Boyer O, Ulinski T, Monteiro RC, Mesnard L. Rare Collagenous Heterozygote Variants in Children With IgA Nephropathy. Kidney Int Rep 2021; 6:1326-1335. [PMID: 34013111 PMCID: PMC8116726 DOI: 10.1016/j.ekir.2021.02.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 02/05/2021] [Accepted: 02/08/2021] [Indexed: 01/15/2023] Open
Abstract
Introduction Childhood IgA nephropathy (cIgAN) is a primary glomerulonephritis clinically characterized by microscopic hematuria and proteinuria, the presence of which may potentially overlap with Alport syndrome. Interestingly, earlier studies suggested that familial IgAN could be linked to the chromosome 2q36 region, also the coding region for collagen type 4 alpha 3/4 (COL4A3/A4). Methods To investigate a possible relationship or phenocopy between Alport syndrome and cIgAN, COL4A3, COL4A4, and COL4A5 exons were sequenced in 36 cIgAN patients. Clinical data and treatment were collected retrospectively. COL4A3/A4/A5 variants were classified according to American College of Medical Genetics and the Association for Molecular Pathology (ACMG/AMP) guidelines. Results Four of 36 cIgAN patients were affected by ACMG class 4/5 COL4A3 heterozygous variants (COL4A3-cIgAN). We found no COL4A4 or COL4A5 variant. Despite having rare and deleterious COL4A3 variants, 3 of 4 COL4A3-cIgAN children developed clinical and biologic features of active IgAN rather than Alport syndrome. Response to intensive immunosuppressive treatment was favorable, leading to a reduction of endocapillary and extracapillary proliferation lesions. High levels of immune immunoglobulin G and A (IgG/IgA) complexes, reduction of proteinuria, and gradual stabilization of estimated glomerular filtration rate (eGFR) argued against Alport syndrome. Nevertheless, COL4A3-cIgAN patients seemed predisposed to a more serious IgAN presentation compared with the non‒COL4A3-cIgAN group, with more glomerulosclerosis and a lower eGFR over time. One of the 4 patients underwent kidney transplant with subsequent IgAN recurrence. Conclusions Predisposition factors for developing serious cIgAN flare-up should be considered for cIgAN with COL4A3 pathologic heterozygous variants. COL4A3 variants, usually responsible for Alport syndrome in adults, should not automatically exclude an immunosuppressive regimen in cIgAN. Moreover, evidence of an ACMG class 4/5 COL4A3 variant in early-stage cIgAN could be a helpful tool for stratifying severity of cIgAN beyond the Oxford classification.
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Affiliation(s)
- Alexandra Cambier
- Service de néphrologie pédiatrique, APHP, Hôpital Universitaire Robert-Debré, Paris, France.,Université de Paris, Paris, France; INSERM U1149; CNRS ERL8252; Centre de recherche sur l'inflammation; Inflamex Laboratory of Excellence, Paris, France.,Inserm UMR_S1155, Paris, France.,Sorbonne Université, Paris, France.,Néphrologie pédiatrique, Centre Hospitalier Universitaire Sainte-Justine, Montréal, Québec, Canada
| | - Thomas Robert
- Centre de néphrologie et transplantation rénale, APHM, Hôpital Universitaire de la Conception, Marseille, France.,Aix Marseille Université, Inserm, MMG, Bioinformatic et genetics.UMRS_1251, Paris, France
| | - Julien Hogan
- Service de néphrologie pédiatrique, APHP, Hôpital Universitaire Robert-Debré, Paris, France
| | - Marion Rabant
- Service de Pathologie, Hôpital Universitaire Hôpital Necker, APHP, Paris, France
| | - Michel Peuchmaur
- Service de Pathologie, Hôpital Universitaire Robert Debré APHP, Paris et Université Diderot, Paris, France
| | - Olivia Boyer
- Service de néphrologie pédiatrique, APHP, Hôpital Universitaire Necker, Paris, France
| | - Tim Ulinski
- Service de néphrologie pédiatrique, APHP, Hôpital Trousseau, Paris, France
| | - Renato C Monteiro
- Université de Paris, Paris, France; INSERM U1149; CNRS ERL8252; Centre de recherche sur l'inflammation; Inflamex Laboratory of Excellence, Paris, France
| | - Laurent Mesnard
- Inserm UMR_S1155, Paris, France.,Sorbonne Université, Paris, France.,Service des urgences néphrologiques et transplantation rénales, APHP, Hôpital Tenon, Paris, France.,Institut des Sciences du Calcul et des Données, Sorbonne Université, Paris, France
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6
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Ghosh S, Das S, Mukherjee J, Abdullah S, Mondal R, Sultana S, Sehgal A, Behl T. Enumerating the role of properdin in the pathogenesis of IgA nephropathy and its possible therapies. Int Immunopharmacol 2021; 93:107429. [PMID: 33571820 DOI: 10.1016/j.intimp.2021.107429] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 11/19/2022]
Abstract
BACKGROUND IgA nephropathy (IgAN) has become the most prevalent form of glomerulonephritis affecting almost 1.3% of the total population worldwide. It is an autoimmune disorder where the host autoantibody forms an immune complex with the defective galactose-deficient IgA1 and gets deposited at the mesangium and endocapillary region of glomeruli. IgA has the capability to activate alternative and lectin complement cascades which even aggravates the condition. Properdin is directly associated with IgAN by activating and stabilising the alternative complement pathway at the mesangium, thereby causing progressive renal damage. OBJECTIVE The present review mainly focuses on correlating the influence of properdin in activating the complement cascade at glomeruli which is the major cause of disease exacerbation. Secondly, we have described the probable therapies and new targets that are under trials to check their efficacy in IgAN. METHODS An in-depth research was carried out from different peer-reviewed articles till December 2020 from several renowned databases like PubMed, Frontier, and MEDLINE, and the information was analysed and written in a simplified manner. RESULTS Co-deposition of properdin is observed along with IgA and C3 in 75%-100% of the patients. It is not yet fully understood whether properdin inhibition can attenuate IgAN, as many conflicting reports have revealed worsening of IgAN after impeding properdin. CONCLUSION With no specific cure still available, the treatment strategies are of great concern to find a better target to restrict the disease progression. More research and clinical trials are required to find out a prominent target to combat IgAN.
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Affiliation(s)
- Srijit Ghosh
- Guru Nanak Institute of Pharmaceutical Science and Technology, Panihati, Kolkata 700114, West Bengal, India
| | - Srijita Das
- Guru Nanak Institute of Pharmaceutical Science and Technology, Panihati, Kolkata 700114, West Bengal, India
| | - Joy Mukherjee
- Bengal School of Technology, Sugandha, Hooghly 712102, West Bengal, India
| | - Salik Abdullah
- Guru Nanak Institute of Pharmaceutical Science and Technology, Panihati, Kolkata 700114, West Bengal, India
| | - Rupsa Mondal
- Guru Nanak Institute of Pharmaceutical Science and Technology, Panihati, Kolkata 700114, West Bengal, India
| | - Shirin Sultana
- Guru Nanak Institute of Pharmaceutical Science and Technology, Panihati, Kolkata 700114, West Bengal, India
| | - Aayush Sehgal
- Chitkara College of Pharmacy, Chitkara University, Patiala 140401, Punjab, India
| | - Tapan Behl
- Chitkara College of Pharmacy, Chitkara University, Patiala 140401, Punjab, India.
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Shi M, Yu S, Ouyang Y, Jin Y, Chen Z, Wei W, Fang Z, Du W, Wang Z, Weng Q, Tong J, Pan X, Wang W, Krzysztof K, Chen N, Xie J. Increased Lifetime Risk of ESRD in Familial IgA Nephropathy. Kidney Int Rep 2020; 6:91-100. [PMID: 33426388 PMCID: PMC7783566 DOI: 10.1016/j.ekir.2020.10.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 10/05/2020] [Accepted: 10/13/2020] [Indexed: 01/10/2023] Open
Abstract
Introduction Familial IgA nephropathy (IgAN) has been widely reported. However, its clinicohistologic characteristics and long-term prognosis are not clear. Methods A total of 348 familial IgAN cases from 167 independent families were recruited and their clinicohistologic characteristics as well as lifetime risk of end-stage renal disease (ESRD) were compared to 1116 sporadic IgAN patients from the same geographic region. Results Of all familial IgAN patients, 60 (17%) came from 32 single-generation (SG; all affected individuals are siblings) families, whereas 286 (82%) came from 134 multiple-generation (MG; affected individuals were present in at least 2 consecutive generations) families. The lifetime ESRD risk was significantly higher in familial patients than sporadic ones after adjusting by gender (hazard ratio [HR]=1.40, 95% confidence interval [CI]: 1.12–1.74, P = 0.004), with 5 years younger in median ESRD age (60 years vs. 65 years in familial and sporadic cases separately). Interestingly, among familial patients, we found cases from SG families (vs. MG families: HR = 2.62, 95% CI: 1.59–4.31, P < 0.001) or with early onset (onset age <30 years) (vs. late onset: HR = 4.79, 95% CI: 3.16–7.26, P < 0.001) had higher lifetime ESRD risk. Furthermore, among sporadic patients, men had lower estimated glomerular filtration rate (eGFR), higher urine protein, higher Oxford T score, and higher risk for life span ESRD compared with women (male vs. female, 25% vs. 17%, P = 0.003) whereas these gender differences were not seen in familial patients. Conclusion Familial IgAN cases had poorer renal outcomes and less gender differences compared with sporadic cases. These findings provide evidence that familial disease represent a distinct subtype of more progressive IgAN. Early diagnosis could improve the prognosis of cases with familial IgAN.
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Affiliation(s)
- Manman Shi
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Department of Nephrology, Traditional Chinese Medicine Hospital of Kunshan, Nanjing University of Chinese Medicine, Kunshan, Jiangsu, China
| | - Shuwen Yu
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yan Ouyang
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yuanmeng Jin
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zijin Chen
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wenjie Wei
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhengying Fang
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wen Du
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhaohui Wang
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Qinjie Weng
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jun Tong
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaoxia Pan
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Weiming Wang
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Kiryluk Krzysztof
- Division of Nephrology, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Nan Chen
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jingyuan Xie
- Department of Nephrology, Institute of Nephrology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Sallustio F, Curci C, Di Leo V, Gallone A, Pesce F, Gesualdo L. A New Vision of IgA Nephropathy: The Missing Link. Int J Mol Sci 2019; 21:ijms21010189. [PMID: 31888082 PMCID: PMC6982283 DOI: 10.3390/ijms21010189] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 12/23/2019] [Accepted: 12/24/2019] [Indexed: 12/13/2022] Open
Abstract
IgA Nephropathy (IgAN) is a primary glomerulonephritis problem worldwide that develops mainly in the 2nd and 3rd decade of life and reaches end-stage kidney disease after 20 years from the biopsy-proven diagnosis, implying a great socio-economic burden. IgAN may occur in a sporadic or familial form. Studies on familial IgAN have shown that 66% of asymptomatic relatives carry immunological defects such as high IgA serum levels, abnormal spontaneous in vitro production of IgA from peripheral blood mononuclear cells (PBMCs), high serum levels of aberrantly glycosylated IgA1, and an altered PBMC cytokine production profile. Recent findings led us to focus our attention on a new perspective to study the pathogenesis of this disease, and new studies showed the involvement of factors driven by environment, lifestyle or diet that could affect the disease. In this review, we describe the results of studies carried out in IgAN patients derived from genomic and epigenomic studies. Moreover, we discuss the role of the microbiome in the disease. Finally, we suggest a new vision to consider IgA Nephropathy as a disease that is not disconnected from the environment in which we live but influenced, in addition to the genetic background, also by other environmental and behavioral factors that could be useful for developing precision nephrology and personalized therapy.
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Affiliation(s)
- Fabio Sallustio
- Interdisciplinary Department of Medicine (DIM), University of Bari “Aldo Moro”, 70124 Bari, Italy
- Department of Basic Medical Sciences, Neuroscience and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy;
- Correspondence: (F.S.); (C.C.)
| | - Claudia Curci
- Department of Basic Medical Sciences, Neuroscience and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy;
- Nephrology, Dialysis and Transplantation Unit, DETO, University “Aldo Moro”, 70124 Bari, Italy; (V.D.L.); (F.P.); (L.G.)
- Correspondence: (F.S.); (C.C.)
| | - Vincenzo Di Leo
- Nephrology, Dialysis and Transplantation Unit, DETO, University “Aldo Moro”, 70124 Bari, Italy; (V.D.L.); (F.P.); (L.G.)
| | - Anna Gallone
- Department of Basic Medical Sciences, Neuroscience and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy;
| | - Francesco Pesce
- Nephrology, Dialysis and Transplantation Unit, DETO, University “Aldo Moro”, 70124 Bari, Italy; (V.D.L.); (F.P.); (L.G.)
| | - Loreto Gesualdo
- Nephrology, Dialysis and Transplantation Unit, DETO, University “Aldo Moro”, 70124 Bari, Italy; (V.D.L.); (F.P.); (L.G.)
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9
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Schena FP, Serino G, Sallustio F, Falchi M, Cox SN. Omics studies for comprehensive understanding of immunoglobulin A nephropathy: state-of-the-art and future directions. Nephrol Dial Transplant 2019; 33:2101-2112. [PMID: 29905852 DOI: 10.1093/ndt/gfy130] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 04/17/2018] [Indexed: 12/11/2022] Open
Abstract
Immunoglobulin A nephropathy (IgAN) is the most common worldwide primary glomerulonephritis with a strong autoimmune component. The disease shows variability in both clinical phenotypes and endpoints and can be potentially subdivided into more homogeneous subtypes through the identification of specific molecular biomarkers. This review focuses on the role of omics in driving the identification of potential molecular subtypes of the disease through the integration of multilevel data from genomics, transcriptomics, epigenomics, proteomics and metabolomics. First, the identification of molecular biomarkers, including mapping of the full spectrum of common and rare IgAN risk alleles, could permit a more precise stratification of IgAN patients. Second, the analysis of transcriptomic patterns and their modulation by epigenetic factors like microRNAs has the potential to increase our understanding in the pathogenic mechanisms of the disease. Third, the specificity of urinary proteomic and metabolomic signatures and the understanding of their functional relevance may contribute to the development of new non-invasive biomarkers for a better molecular characterization of the renal damage and its follow-up. All these approaches can give information for targeted therapeutic decisions and will support novel clinical decision making. In conclusion, we offer a framework of omic studies and outline barriers and potential solutions that should be used for improving the diagnosis and treatment of the disease. The ongoing decade is exploiting novel high-throughput molecular technologies and computational analyses for improving the diagnosis (precision nephrology) and treatment (personalized therapy) of the IgAN subtypes.
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Affiliation(s)
- Francesco Paolo Schena
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy.,Schena Foundation, Valenzano, Bari, Italy
| | - Grazia Serino
- National Institute of Gastroenterology 'S. de Bellis', Research Hospital, Castellana Grotte, Bari, Italy
| | - Fabio Sallustio
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Mario Falchi
- Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | - Sharon N Cox
- Division of Nephrology, Dialysis, and Transplantation, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy.,Schena Foundation, Valenzano, Bari, Italy
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10
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Abstract
IgA nephropathy (IgAN) is one of the most common primary glomerulonephritides throughout the world and a major cause of end-stage renal disease among the East Asian population. It is widely considered that genetic factors play an important role in the pathogenesis of IgAN. This article summarizes the recent achievements in the genetic studies of IgAN, focusing mainly on studies performed in East Asia, from the early association studies of candidate genes and family based designs, to the recent genome-wide association studies. There have been five large genome-wide association studies performed that have identified multiple susceptibility loci for IgAN, especially some novel loci identified in the Chinese population. Genes within these loci have provided important insights into the potential biological mechanisms and pathways that influence genetic risk to IgAN. In susceptibility loci/genes, the study of genetic interaction and structural variants (such as copy number variation) was conducted to identify more variants associated with IgAN and disease progression. Genetic studies of IgAN from East Asia have made great achievements over the years. Most susceptibility loci discovered to date encode genes involved in the response to mucosal pathogens, suggesting that an intestinal-immune network for IgA production may be involved in the pathogenesis of IgAN. Although genetic studies of the complex diseases are challenging, for future genetic studies in IgAN, new genetic techniques and methods of analysis, especially next-generation sequencing, need to be applied to push the genetic studies forward.
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Affiliation(s)
- Ming Li
- Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.; Key Laboratory of Nephrology, National Health Commission (NHC) and Guangdong Province, Guangzhou, Guangdong, China
| | - Xue-Qing Yu
- Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.; Key Laboratory of Nephrology, National Health Commission (NHC) and Guangdong Province, Guangzhou, Guangdong, China.; Guangdong Medical University, Zhanjiang, Guangdong, China..
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11
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Abstract
IgA nephropathy (IgAN) represents a genetically complex multifactorial trait. Its prevalence and clinical features vary geographically, and the disease has a range of clinical presentations that suggest multiple subtypes. Although familial aggregation of IgAN has been reported and prior linkage studies have highlighted significant locus heterogeneity, specific genetic variants underlying familial IgAN have not yet been defined. Population-based genome-wide association studies (GWAS) have discovered nearly 20 IgAN risk loci, providing novel insights into disease epidemiology and molecular mechanisms, shifting old paradigms of the disease pathogenesis. Follow-up fine-mapping studies have identified specific causal variants, and genotype-phenotype correlation studies have begun to delineate clinical consequences of GWAS risk alleles. The association between IgAN and galactose-deficient IgA1 (Gd-IgA1), a validated serum biomarker of IgAN, presented another avenue for genetic discovery because elevated serum levels of Gd-IgA1 are highly heritable. Recent GWAS for serum Gd-IgA1 levels provided novel insights into genetic regulation of this trait, but the genetic link between Gd-IgA1 and IgAN has not yet been established. In this review, we discuss these developments in the broader context of modern genetic approaches to complex traits, and provide our perspective on the critical challenges that need to be addressed to advance the field.
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Affiliation(s)
- Y Dana Neugut
- Division of Nephrology, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY
| | - Krzysztof Kiryluk
- Division of Nephrology, Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY.
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12
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Yeo SC, Liu X, Liew A. Complement factor H gene polymorphism rs6677604 and the risk, severity and progression of IgA nephropathy: A systematic review and meta-analysis. Nephrology (Carlton) 2019; 23:1096-1106. [PMID: 29240274 DOI: 10.1111/nep.13210] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/08/2017] [Indexed: 12/30/2022]
Abstract
AIM Studies reporting the association between complement factor H gene rs6677604 polymorphism and susceptibility to IgA nephropathy (IgAN) had yielded inconsistent results. We performed a systematic review and meta-analysis to clarify the association between rs6677604 and IgAN susceptibility, disease severity and chronic progression. METHODS A comprehensive database search was performed to identify eligible studies. Meta-analyses were performed for rs6677604 allele frequency, genotypes and the association with IgAN susceptibility. RESULTS 10 studies were included in the systematic review. Among them, four studies containing 10 distinct datasets (15,617 cases and 31,957 controls) were included in the meta-analysis. The pooled frequency of the minor allele (A) was significantly higher in Europeans than in Asians across both IgAN cases and controls, and the frequency of the minor allele (A) in IgAN cases was also significantly lower than that in controls across both European and Asian subgroups. Significant associations were detected between rs6677604 and risk of developing IgAN, when comparing allele A vs. G, genotype AA vs. GG, genotype AA vs. AG and genotype AG vs. GG. In analysis stratified by ethnicity, significant association was only observed in Europeans but not in Asians when comparing AA vs. GG or AA vs. AG. CONCLUSION Our pooled analysis showed a significant association between rs6677604-(A) allele and IgAN susceptibility, supporting the importance of complement activation in the pathogenesis of IgAN. The presence of rs6677604-(A) allele may be associated with a decreased the risk of IgAN in Europeans, but the association was not confirmed in Asians.
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Affiliation(s)
- See Cheng Yeo
- Department of Renal Medicine, Tan Tock Seng Hospital, Singapore, Singapore
| | - Xinyang Liu
- Department of Renal Medicine, Tan Tock Seng Hospital, Singapore, Singapore
| | - Adrian Liew
- Department of Renal Medicine, Tan Tock Seng Hospital, Singapore, Singapore
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13
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Jin G, Liang Y, Yan X, Zhang L, Li Z, Yin A, Wang X, Tian P. Association between the <b><i>ACYP2</i></b> Polymorphisms and IgAN Risk in the Chinese Han Population. Kidney Blood Press Res 2019; 44:810-822. [DOI: 10.1159/000501703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
<b><i>Background/Aims:</i></b> The association between <i>ACYP2</i>(Acylphosphatase 2) polymorphisms and immunoglobulin A nephropathy (IgAN) risk in the Chinese Han population remains unclear. We aimed to evaluate the association between <i>ACYP2</i> polymorphisms and IgAN risk by performing a case-control study. <b><i>Methods:</i></b> Eleven <i>ACYP2</i> single nucleotide polymorphisms (SNPs) from 416 IgAN patients and 495 healthy controls were genotyped using the Sequenom MassARRAY platform. Odds ratio (OR) and 95% confidence interval (CI) were calculated to evaluate the association of <i>ACYP2</i> polymorphisms with IgAN risk. <b><i>Results:</i></b> We observed that rs843720 was significantly associated with an increased risk of IgAN (allele G: OR = 1.23, 95% CI: 1.01–1.49, <i>p</i> = 0.036; dominant model: OR = 1.55, 95% CI: 1.01–2.37, <i>p =</i>0.044; log-additive model: OR = 1.43, 95% CI: 1.04–1.95, <i>p</i> = 0.026) before Bonferroni correction. The SNP rs12615793 was also significantly associated with an increased IgAN risk in the recessive model (OR = 3.33, 95% CI: 1.05–10.51, <i>p</i> = 0.042) before Bonferroni correction. <b><i>Conclusion:</i></b> These findings suggested that polymorphisms (rs843720 and rs12615793) of <i>ACYP2</i> may be pivotal in the development of IgAN. However, more functional and association studies with larger sample sizes should be performed to further validate our results in the future.
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14
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Li M, Yu X. Genetic study of immunoglobulin A nephropathy: From research to clinical application. Nephrology (Carlton) 2018; 23 Suppl 4:26-31. [PMID: 30298665 DOI: 10.1111/nep.13470] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Ming Li
- Department of Nephrology, The First Affiliated Hospital; Sun Yat-Sen University; Guangzhou China
- Key Laboratory of Nephrology; Ministry of Health and Guangdong Province; Guangzhou China
| | - Xueqing Yu
- Department of Nephrology, The First Affiliated Hospital; Sun Yat-Sen University; Guangzhou China
- Key Laboratory of Nephrology; Ministry of Health and Guangdong Province; Guangzhou China
- Department of Nephrology, Guangdong Medical University; Zhanjiang Guangdong China
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15
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Yang B, Zhang J, Liu X, Huang Z, Su Z, Liao Y, Wang L. Genetic polymorphisms in HLA-DP and STAT4 are associated with IgA nephropathy in a Southwest Chinese population. Oncotarget 2018; 9:7066-7074. [PMID: 29467950 PMCID: PMC5805536 DOI: 10.18632/oncotarget.23829] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 12/28/2017] [Indexed: 02/05/2023] Open
Abstract
IgA nephropathy (IgAN) is the most common chronic glomerular disease worldwide. Genetic factors are thought to be crucial in the pathogenesis of IgAN. However, few data are available on the relationship between human leucocyte antigen (HLA) and signal transducer and activator of transcription 4 (STAT4) polymorphisms and IgAN susceptibility in the Chinese population. Therefore, we examined HLA-DP/DQ and STAT4 polymorphisms (rs3077, rs9277535, rs7453920 and rs7574865) in a total of 630 subjects including 140 IgAN and 490 healthy controls in Chinese. There were significant associations between IgAN patients and healthy controls in the allele frequency of rs3077, rs9277535 and rs7574865. In addition, the genotypes of rs3077, rs9277535 and rs7574865 were also significantly associated with IgAN under recessive models. Moreover, the haplotypes block AAG, AGG, GAG and GGA in the HLA gene significantly correlated with the risk of IgAN. This is the first study demonstrating the significant associations of SNP rs3077, rs9277535 and rs7574865 and the haplotypes in the HLA gene with the risk of IgAN in a Southwest Chinese population. This research provides a new insight into the significant relationship between HLA-DP and STAT4 polymorphisms and the susceptibility to IgAN.
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Affiliation(s)
- Bin Yang
- Department of Lab Medicine, West China Hospital, Sichuan University, Sichuan 610041, Chengdu, China
| | - Junlong Zhang
- Department of Lab Medicine, West China Hospital, Sichuan University, Sichuan 610041, Chengdu, China
| | - Xinle Liu
- Department of Lab Medicine, West China Hospital, Sichuan University, Sichuan 610041, Chengdu, China
| | - Zhuochun Huang
- Department of Lab Medicine, West China Hospital, Sichuan University, Sichuan 610041, Chengdu, China
| | - Zhenzhen Su
- Department of Lab Medicine, West China Hospital, Sichuan University, Sichuan 610041, Chengdu, China
| | - Yun Liao
- Department of Lab Medicine, West China Hospital, Sichuan University, Sichuan 610041, Chengdu, China
| | - Lanlan Wang
- Department of Lab Medicine, West China Hospital, Sichuan University, Sichuan 610041, Chengdu, China
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16
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17
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Zhang YM, Zhou XJ, Zhang H. What Genetics Tells Us About the Pathogenesis of IgA Nephropathy: The Role of Immune Factors and Infection. Kidney Int Rep 2017; 2:318-331. [PMID: 29142962 PMCID: PMC5678660 DOI: 10.1016/j.ekir.2017.02.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 02/07/2017] [Accepted: 02/08/2017] [Indexed: 02/04/2023] Open
Abstract
Immunoglobulin A nephropathy (IgAN) is the most common type of primary glomerulonephritis, which is characterized by IgA1-containing immune-deposits in the glomerular mesangium. The epidemiologic observations of familial clustering as well as ethnic and regional discrepancies indicate a genetic component to IgAN. Large, international, genome-wide association studies have identified several susceptibility genes and loci for IgAN, many of which have been implicated in immune regulation and are shared with other autoimmune diseases. Notably, increasing numbers of genes involved in mucosal immunity have been detected; such genes may impact the susceptibility and progression of IgAN through interaction with environmental stimuli (especially infection). Here, we discuss the innate and adaptive immune mechanisms that drive protective immunity against pathogens. Our goal is to provide a representative overview of the synergistic roles between genetic predisposition and infection in IgAN pathogenesis. We anticipate that these results will provide potential therapeutic agents and advances in precision medicine.
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Affiliation(s)
- Yue-Miao Zhang
- Renal Division, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China
| | - Xu-Jie Zhou
- Renal Division, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China
| | - Hong Zhang
- Renal Division, Peking University First Hospital, Beijing, China.,Peking University Institute of Nephrology, Beijing, China.,Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, China.,Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Peking University, Ministry of Education, Beijing, China
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18
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Cox SN, Pesce F, El-Sayed Moustafa JS, Sallustio F, Serino G, Kkoufou C, Giampetruzzi A, Ancona N, Falchi M, Schena FP. Multiple rare genetic variants co-segregating with familial IgA nephropathy all act within a single immune-related network. J Intern Med 2017; 281:189-205. [PMID: 27730700 PMCID: PMC5297991 DOI: 10.1111/joim.12565] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND IgA nephropathy (IgAN) is a common complex disease with a strong genetic involvement. We aimed to identify novel, rare, highly penetrant risk variants combining family-based linkage analysis with whole-exome sequencing (WES). METHODS Linkage analysis of 16 kindreds of South Italian ancestry was performed using an 'affected-only' strategy. Eight most informative trios composed of two familial cases and an intrafamilial control were selected for WES. High-priority variants in linked regions were identified and validated using Sanger sequencing. Custom TaqMan assays were designed and carried out in the 16 kindreds and an independent cohort of 240 IgAN patients and 113 control subjects. RESULTS We found suggestive linkage signals in 12 loci. After sequential filtering and validation of WES data, we identified 24 private or extremely rare (MAF <0.0003) linked variants segregating with IgAN status. These were present within coding or regulatory regions of 23 genes that merged into a common functional network. The genes were interconnected by AKT, CTNNB1, NFKB, MYC and UBC, key modulators of WNT/β-catenin and PI3K/Akt pathways, which are implicated in IgAN pathogenesis. Overlaying publicly available expression data, genes/proteins with expression notably altered in IgAN were included in this immune-related network. In particular, the network included the glucocorticoid receptor gene, NR3C1, which is the target of corticosteroid therapy routinely used in the treatment of IgAN. CONCLUSION Our findings suggest that disease susceptibility could be influenced by multiple rare variants acting in a common network that could provide the starting point for the identification of potential drug targets for personalized therapy.
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Affiliation(s)
- S N Cox
- Department of Emergency and Organ Transplantation, University of Bari Aldo Moro, Bari, Italy.,C.A.R.S.O. Consortium, University of Bari, Bari, Italy
| | - F Pesce
- Department of Emergency and Organ Transplantation, University of Bari Aldo Moro, Bari, Italy.,Department of Genomics of Common Disease, Imperial College London, London, UK
| | - J S El-Sayed Moustafa
- Department of Genomics of Common Disease, Imperial College London, London, UK.,Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | - F Sallustio
- Department of Emergency and Organ Transplantation, University of Bari Aldo Moro, Bari, Italy
| | - G Serino
- Department of Emergency and Organ Transplantation, University of Bari Aldo Moro, Bari, Italy.,IRCCS 'de Bellis', Laboratory of Experimental Immunopathology, Bari, Italy
| | - C Kkoufou
- Department of Genomics of Common Disease, Imperial College London, London, UK
| | - A Giampetruzzi
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
| | | | - M Falchi
- Department of Genomics of Common Disease, Imperial College London, London, UK.,Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | - F P Schena
- Department of Emergency and Organ Transplantation, University of Bari Aldo Moro, Bari, Italy.,C.A.R.S.O. Consortium, University of Bari, Bari, Italy
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19
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Han L, Fang X, He Y, Ruan XZ. ISN Forefronts Symposium 2015: IgA Nephropathy, the Gut Microbiota, and Gut−Kidney Crosstalk. Kidney Int Rep 2016. [PMCID: PMC5678672 DOI: 10.1016/j.ekir.2016.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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Abstract
IgA nephropathy is the most common form of primary glomerulonephritis worldwide and an important cause of chronic kidney disease and end-stage kidney failure. Its pathophysiology remains in part unsolved but it is recognized as an immune complex disease. Recent years have brought progress in the field through the discovery of several genetic susceptibility loci and the formulation of the multi-hit pathogenesis model. Presentation, clinical course and histology can be extremely variable, making any histological classification still difficult. Indeed, most therapeutic studies until now include patients based only on the severity of clinical criteria but the new classification of Oxford should change that. Only the management of patients with nephropathy with minimal change glomerular lesions and nephrotic syndrome, or extra-capillary glomerulonephritis and rapidly progressive renal failure, is consensual: Corticosteroids alone for the first and associated with immunosuppressive drugs for the latter. The recent Kidney Disease Improving Global Outcomes (KDIGO) consensus treatment guideline is still controversial, especially in light of the last clinical studies. Corticosteroid therapy can be discussed in patients with proteinuria greater than 1 g/day without renal failure. All IgA nephropathy patients should benefit from the global management of chronic glomerular disease, including a renin-angiotensin system blocker in the presence of hypertension or proteinuria.
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Affiliation(s)
- Evangéline Pillebout
- Service de néphrologie, hôpital Saint-Louis, 1, avenue Claude-Vellefaux, 75010 Paris, France.
| | - Jérôme Vérine
- Service d'anatomie pathologique, hôpital Saint-Louis, 1, avenue Claude-Vellefaux, 75010 Paris, France
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21
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Abstract
Globally, IgA nephropathy (IgAN) is the most common primary glomerulonephritis that can progress to renal failure. The exact pathogenesis of IgAN is not well defined, but current biochemical and genetic data implicate overproduction of aberrantly glycosylated IgA1. These aberrant immunoglobulins are characterized by galactose deficiency of some hinge-region O-linked glycans. However, aberrant glycosylation alone is insufficient to induce renal injury: the participation of glycan-specific IgA and IgG autoantibodies that recognize the undergalactosylated IgA1 molecule is required. Glomerular deposits of immune complexes containing undergalactosylated IgA1 activate mesangial cells, leading to the local overproduction of cytokines, chemokines and complement. Emerging data indicate that mesangial-derived mediators that are released following mesangial deposition of IgA1 lead to podocyte and tubulointerstitial injury via humoral crosstalk. Patients can present with a range of signs and symptoms, from asymptomatic microscopic haematuria to macroscopic haematuria. The clinical progression varies, with 30-40% of patients reaching end-stage renal disease 20-30 years after the first clinical presentation. Currently, no IgAN-specific therapies are available and patients are managed with the aim of controlling blood pressure and maintaining renal function. However, new therapeutic approaches are being developed, building upon our ever-improving understanding of disease pathogenesis.
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Abstract
Since its first description in 1968, IgA nephropathy has remained the most common form of primary glomerulonephritis leading to chronic kidney disease in developed countries. The clinical progression varies, and consequent end-stage renal disease occurs in 30% to 40% of patients 20 to 30 years after the first clinical presentation. Current data implicate overproduction of aberrantly glycosylated IgA1 as being pivotal in the induction of renal injury. Effective and specific treatment is still lacking, and new therapeutic approaches will be developed after better understanding the disease pathogenesis.
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Affiliation(s)
- Kar Neng Lai
- Nephrology Department, Hong Kong Sanatorium and Hospital, Happy Valley, Hong Kong; Nephrology Division Department of Medicine, University of Hong Kong, Queen Mary Hospital, Hong Kong
| | - Joseph C K Leung
- Nephrology Division Department of Medicine, University of Hong Kong, Queen Mary Hospital, Hong Kong
| | - Sydney C W Tang
- Nephrology Division Department of Medicine, University of Hong Kong, Queen Mary Hospital, Hong Kong
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23
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Aberrantly methylated DNA regions lead to low activation of CD4+ T-cells in IgA nephropathy. Clin Sci (Lond) 2016; 130:733-46. [PMID: 26846681 DOI: 10.1042/cs20150711] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 02/04/2016] [Indexed: 12/12/2022]
Abstract
IgAN (IgA nephropathy) is the most common form of primary glomerulonephritis worldwide and has a strong genetic component. In this setting, DNA methylation could also be an important factor influencing this disease. We performed a genome-wide screening for DNA methylation in CD4(+) T-cells from IgAN patients and found three regions aberrantly methylated influencing genes involved in the response and proliferation of CD4(+) T-cells. Two hypomethylated regions codified genes involved in TCR (T-cell receptor) signalling, TRIM27 (tripartite motif-containing 27) and DUSP3 (dual-specificity phosphatase 3), and an hypermethylated region included the VTRNA2-1 (vault RNA 2-1) non-coding RNA, also known as miR-886 precursor. We showed that the aberrant methylation influences the expression of these genes in IgAN patients. Moreover, we demonstrated that the hypermethylation of the miR-886 precursor led to a decreased CD4(+) T-cell proliferation following TCR stimulation and to the overexpression of TGFβ (transforming growth factor β). Finally, we found a Th1/Th2 imbalance in IgAN patients. The IL (interleukin)-2/IL-5 ratio was notably higher in IgAN patients and clearly indicated a Th1 shift. In conclusion, we identified for the first time some specific DNA regions abnormally methylated in IgAN patients that led to the reduced TCR signal strength of the CD4(+) T-cells and to their anomalous response and activation that could explain the T-helper cell imbalance. The present study reveals new molecular mechanisms underlying the abnormal CD4(+) T-cell response in IgAN patients.
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24
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Niu D, Gao Y, Xie L, Sun J, Lu W, Jin G, Hao Y, Zhang Y, Yin A, Geng Y, Zhang W, Chen C, Li S. Genetic polymorphisms in TNFSF13 and FDX1 are associated with IgA nephropathy in the Han Chinese population. Hum Immunol 2015; 76:831-5. [DOI: 10.1016/j.humimm.2015.09.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Revised: 05/06/2014] [Accepted: 09/28/2015] [Indexed: 11/17/2022]
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25
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Magistroni R, D’Agati VD, Appel GB, Kiryluk K. New developments in the genetics, pathogenesis, and therapy of IgA nephropathy. Kidney Int 2015; 88:974-89. [PMID: 26376134 PMCID: PMC4653078 DOI: 10.1038/ki.2015.252] [Citation(s) in RCA: 173] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 05/11/2015] [Accepted: 05/20/2015] [Indexed: 02/07/2023]
Abstract
Recent years have brought notable progress in the field of IgA nephropathy. Here, we highlight important new directions and latest developments, including successful discovery of several genetic susceptibility loci, formulation of the multihit pathogenesis model, introduction of the Oxford pathology scoring system, and formalization of the Kidney Disease Improving Global Outcomes (KDIGO) consensus treatment guidelines. We focus on the latest genetic findings that confirm a strong contribution of inherited factors and explain some of the geoethnic disparities in disease susceptibility. Most IgA nephropathy susceptibility loci discovered to date encode genes involved in the maintenance of the intestinal epithelial barrier and response to mucosal pathogens. The concerted pattern of interpopulation allelic differentiation across all genetic loci parallels the disease prevalence and correlates with variation in local pathogens, suggesting that multilocus adaptation might have shaped the present-day landscape of IgA nephropathy. Importantly, the 'Intestinal Immune Network for IgA Production' emerged as one of the new targets for potential therapeutic intervention. We place these findings in the context of the multihit pathogenesis model and existing knowledge of IgA immunobiology. Lastly, we provide our perspective on the existing treatment options, discuss areas of clinical uncertainty, and outline ongoing clinical trials and translational studies.
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Affiliation(s)
- Riccardo Magistroni
- Division of Nephrology, Department of Medicine, College of Physicians & Surgeons, Columbia University, New York, NY, USA
- Division of Nephrology Dialysis and Transplantation, Department of Surgery, Medicine, Dentistry, Morphologic Science, Transplantation, Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Italy
| | - Vivette D. D’Agati
- Division of Renal Pathology, Department of Pathology, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Gerald B. Appel
- Division of Nephrology, Department of Medicine, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Krzysztof Kiryluk
- Division of Nephrology, Department of Medicine, College of Physicians & Surgeons, Columbia University, New York, NY, USA
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Yang J, Wu SJ, Dai WT, Li YX, Li YY. The human disease network in terms of dysfunctional regulatory mechanisms. Biol Direct 2015; 10:60. [PMID: 26450611 PMCID: PMC4599653 DOI: 10.1186/s13062-015-0088-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 09/25/2015] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Elucidation of human disease similarities has emerged as an active research area, which is highly relevant to etiology, disease classification, and drug repositioning. In pioneer studies, disease similarity was commonly estimated according to clinical manifestation. Subsequently, scientists started to investigate disease similarity based on gene-phenotype knowledge, which were inevitably biased to well-studied diseases. In recent years, estimating disease similarity according to transcriptomic behavior significantly enhances the probability of finding novel disease relationships, while the currently available studies usually mine expression data through differential expression analysis that has been considered to have little chance of unraveling dysfunctional regulatory relationships, the causal pathogenesis of diseases. METHODS We developed a computational approach to measure human disease similarity based on expression data. Differential coexpression analysis, instead of differential expression analysis, was employed to calculate differential coexpression level of every gene for each disease, which was then summarized to the pathway level. Disease similarity was eventually calculated as the partial correlation coefficients of pathways' differential coexpression values between any two diseases. The significance of disease relationships were evaluated by permutation test. RESULTS Based on mRNA expression data and a differential coexpression analysis based method, we built a human disease network involving 1326 significant Disease-Disease links among 108 diseases. Compared with disease relationships captured by differential expression analysis based method, our disease links shared known disease genes and drugs more significantly. Some novel disease relationships were discovered, for example, Obesity and cancer, Obesity and Psoriasis, lung adenocarcinoma and S. pneumonia, which had been commonly regarded as unrelated to each other, but recently found to share similar molecular mechanisms. Additionally, it was found that both the type of disease and the type of affected tissue influenced the degree of disease similarity. A sub-network including Allergic asthma, Type 2 diabetes and Chronic kidney disease was extracted to demonstrate the exploration of their common pathogenesis. CONCLUSION The present study produces a global view of human diseasome for the first time from the viewpoint of regulation mechanisms, which therefore could provide insightful clues to etiology and pathogenesis, and help to perform drug repositioning and design novel therapeutic interventions.
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Affiliation(s)
- Jing Yang
- School of Biotechnology, East China University of Science and Technology, Shanghai, 200237, P.R. China. .,Shanghai Center for Bioinformation Technology, 1278 Keyuan Road, Shanghai, 201203, P.R. China. .,Key Laboratory of Systems Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, P.R. China.
| | - Su-Juan Wu
- School of Biotechnology, East China University of Science and Technology, Shanghai, 200237, P.R. China. .,Shanghai Center for Bioinformation Technology, 1278 Keyuan Road, Shanghai, 201203, P.R. China.
| | - Wen-Tao Dai
- Shanghai Center for Bioinformation Technology, 1278 Keyuan Road, Shanghai, 201203, P.R. China. .,Shanghai Industrial Technology Institute, 1278 Keyuan Road, Shanghai, 201203, P.R. China. .,Shanghai Engineering Research Center of Pharmaceutical Translation, 1278 Keyuan Road, Shanghai, 201203, P.R. China.
| | - Yi-Xue Li
- School of Biotechnology, East China University of Science and Technology, Shanghai, 200237, P.R. China. .,Shanghai Center for Bioinformation Technology, 1278 Keyuan Road, Shanghai, 201203, P.R. China. .,Shanghai Industrial Technology Institute, 1278 Keyuan Road, Shanghai, 201203, P.R. China. .,Key Laboratory of Systems Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, P.R. China. .,Shanghai Engineering Research Center of Pharmaceutical Translation, 1278 Keyuan Road, Shanghai, 201203, P.R. China.
| | - Yuan-Yuan Li
- Shanghai Center for Bioinformation Technology, 1278 Keyuan Road, Shanghai, 201203, P.R. China. .,Shanghai Industrial Technology Institute, 1278 Keyuan Road, Shanghai, 201203, P.R. China. .,Shanghai Engineering Research Center of Pharmaceutical Translation, 1278 Keyuan Road, Shanghai, 201203, P.R. China.
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Liu R, Hu B, Li Q, Jing X, Zhong C, Chang Y, Liao Q, Lam MF, Leung JC, Lai KN, Wang Y. Novel genes and variants associated with IgA nephropathy by co-segregating with the disease phenotypes in 10 IgAN families. Gene 2015; 571:43-51. [DOI: 10.1016/j.gene.2015.06.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 05/14/2015] [Accepted: 06/16/2015] [Indexed: 12/23/2022]
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Feehally J, Barratt J. The Genetics of IgA Nephropathy: An Overview from Western Countries. KIDNEY DISEASES 2015; 1:33-41. [PMID: 27536663 DOI: 10.1159/000381738] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2015] [Revised: 03/16/2015] [Indexed: 12/27/2022]
Abstract
BACKGROUND IgA nephropathy (IgAN) is the commonest primary glomerulonephritis worldwide and a significant cause of chronic kidney disease and end-stage renal disease. It is widely accepted that genetic factors play a role in the pathogenesis of IgAN. However, the identity of these genetic factors remains uncertain. SUMMARY Critical to all genetic studies is a precise phenotypic definition of the disease. It is well recognised that IgAN displays striking phenotypic variation, raising the possibility that it may not be a single disease and it may not be the same disease in different parts of the world. In this review, we discuss the challenges that this phenotypic variation poses to interpreting genetic data and the current evidence for specific gene involvement in IgAN, focusing particularly on data from European IgAN cohorts. KEY MESSAGE With advances in genetic techniques, in particular next-generation sequencing, and an increased understanding of the importance of copy number variations, epigenetics and transcriptomics, it is likely that we will gain a greater understanding of the genetic basis for IgAN. However, due to the lack of consistency in epidemiological clinicopathological studies both within and between continents, this will only be achieved if we are able to more precisely phenotype IgAN populations. FACTS FROM EAST AND WEST The reported prevalence of IgAN is higher in Asia than in Europe and North America. However, differences in use of biopsy for the diagnosis of IgAN should be taken into account in analysing data from both East and West. In Europe, IgAN affects men more frequently than women; this is not the case in Asia. Familial IgAN has been more frequently reported in Europe than in Asia. Within Europe, familial IgAN is more evident in southern than in northern populations. Changes in the pattern of serum IgA1 O-glycosylation is a common finding in IgAN patients in the East and West. SNPs within the gene coding for the enzyme C1GALT1 have been reported in Chinese and European patients. However, there is no evidence for a role of gene polymorphism of the C1GALT1 chaperone cosmc in Europeans. Genetic variants in the HLA gene family have been observed in populations from the East and West. Associations between IgAN and variants of the TAP1/PSMB and DEFA genes were observed in Asian but not in Western patients. Association with the angiotensin-converting enzyme gene was seen only in Asian patients.
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Affiliation(s)
- John Feehally
- The John Walls Renal Unit, University Hospitals of Leicester, and Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
| | - Jonathan Barratt
- The John Walls Renal Unit, University Hospitals of Leicester, and Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
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Zhu L, Zhang H. The Genetics of IgA Nephropathy: An Overview from China. KIDNEY DISEASES 2015; 1:27-32. [PMID: 27536662 DOI: 10.1159/000381740] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 03/17/2015] [Indexed: 12/21/2022]
Abstract
BACKGROUND IgA nephropathy (IgAN) is the most common type of primary glomerulonephritis worldwide. Highly variable data for disease prevalence and reports of familial clustering suggest the involvement of genetic factors in IgAN. As China is an area with a high prevalence of IgAN, Chinese scholars have made a considerable effort to reveal the underlying genetic architecture of IgAN. SUMMARY In this review, we summarize recent achievements in the genetic studies of IgAN, focusing mainly on studies undertaken in China. Early association studies followed a population-based design and focused on a single variant or single gene. Subsequently, family-based designs and genetic interactions applied by Chinese scholars revealed an association of variants in MEGSIN and glycosyltransferase genes with IgAN. Recently, genome-wide association studies (GWAS) have been used to identify multiple susceptibility loci for IgAN, and they have, for the most part, been validated in Chinese populations. KEY MESSAGE More efforts should be made to explore the underlying genetic mechanisms of GWAS-identified variants. In future studies in IgAN, the application of a systems genetics approach would be helpful and productive. FACTS FROM EAST AND WEST The reported prevalence of IgAN is higher in Asia than in Europe and North America. However, differences in use of biopsy for the diagnosis of IgAN should be taken into account in analyzing data from both East and West. In Europe, IgAN affects men more frequently than women; this is not the case in Asia. Familial IgAN has been more frequently reported in Europe than in Asia. Within Europe, familial IgAN is more evident in southern than in northern populations. Changes in the pattern of serum IgA1 O-glycosylation is a common finding in IgAN patients in the East and West. SNPs within the gene coding for the enzyme C1GALT1 have been reported in Chinese and European patients. However, there is no evidence for a role of gene polymorphism of the C1GALT1 chaperone cosmc in Europeans. Genetic variants in the HLA gene family have been observed in populations from the East and West. Associations between IgAN and variants of the TAP1/PSMB and DEFA genes were observed in Asian but not in Western patients. Association with the angiotensin-converting enzyme gene was seen only in Asian patients.
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Affiliation(s)
- Li Zhu
- Renal Division, Department of Medicine, Peking University First Hospital, Peking University Institute of Nephrology, Key Laboratory of Renal Disease, Ministry of Health of China, and Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, China
| | - Hong Zhang
- Renal Division, Department of Medicine, Peking University First Hospital, Peking University Institute of Nephrology, Key Laboratory of Renal Disease, Ministry of Health of China, and Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, China
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A SPRY2 mutation leading to MAPK/ERK pathway inhibition is associated with an autosomal dominant form of IgA nephropathy. Eur J Hum Genet 2015; 23:1673-8. [PMID: 25782674 DOI: 10.1038/ejhg.2015.52] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 01/16/2015] [Accepted: 02/20/2015] [Indexed: 11/08/2022] Open
Abstract
IgA nephropathy (IgAN) represents the most common primary glomerulonephritis worldwide with a prevalence of 25-50% among patients with primary glomerulopathies. In ~5-10% of the patients the disease segregates with an autosomal dominant (AD) pattern. Association studies identified loci on chromosomes 1q32, 6p21, 8p23, 17p13, 22q12, whereas classical linkage studies on AD families identified loci on chromosomes 2q36, 4q26-31, 6q22, 17q12-22. We have studied a large Sicilian family where IgAN segregates with an AD transmission. To identify the causal gene, the exomes of two affected and one unaffected individual have been sequenced. From the bioinformatics analysis a p.(Arg119Trp) variant in the SPRY2 gene was identified as the probable disease-causing mutation. Moreover, functional characterization of this variant showed that it is responsible for the inhibition of the MAPK/ERK1/2 pathway. The same effect was observed in two sporadic IgAN patients carriers of wild-type SPRY2, suggesting that downregulation of the MAPK/ERK1/2 pathway represents a common mechanism leading to IgAN.
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Kiryluk K, Li Y, Scolari F, Sanna-Cherchi S, Choi M, Verbitsky M, Fasel D, Lata S, Prakash S, Shapiro S, Fischman C, Snyder HJ, Appel G, Izzi C, Viola BF, Dallera N, Vecchio LD, Barlassina C, Salvi E, Bertinetto FE, Amoroso A, Savoldi S, Rocchietti M, Amore A, Peruzzi L, Coppo R, Salvadori M, Ravani P, Magistroni R, Ghiggeri GM, Caridi G, Bodria M, Lugani F, Allegri L, Delsante M, Maiorana M, Magnano A, Frasca G, Boer E, Boscutti G, Ponticelli C, Mignani R, Marcantoni C, Di Landro D, Santoro D, Pani A, Polci R, Feriozzi S, Chicca S, Galliani M, Gigante M, Gesualdo L, Zamboli P, Maixnerová D, Tesar V, Eitner F, Rauen T, Floege J, Kovacs T, Nagy J, Mucha K, Pączek L, Zaniew M, Mizerska-Wasiak M, Roszkowska-Blaim M, Pawlaczyk K, Gale D, Barratt J, Thibaudin L, Berthoux F, Canaud G, Boland A, Metzger M, Panzer U, Suzuki H, Goto S, Narita I, Caliskan Y, Xie J, Hou P, Chen N, Zhang H, Wyatt RJ, Novak J, Julian BA, Feehally J, Stengel B, Cusi D, Lifton RP, Gharavi AG. Discovery of new risk loci for IgA nephropathy implicates genes involved in immunity against intestinal pathogens. Nat Genet 2014; 46:1187-96. [PMID: 25305756 PMCID: PMC4213311 DOI: 10.1038/ng.3118] [Citation(s) in RCA: 439] [Impact Index Per Article: 43.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 09/23/2014] [Indexed: 12/12/2022]
Abstract
We performed a genome-wide association study (GWAS) of IgA nephropathy (IgAN), the most common form of glomerulonephritis, with discovery and follow-up in 20,612 individuals of European and East Asian ancestry. We identified six new genome-wide significant associations, four in ITGAM-ITGAX, VAV3 and CARD9 and two new independent signals at HLA-DQB1 and DEFA. We replicated the nine previously reported signals, including known SNPs in the HLA-DQB1 and DEFA loci. The cumulative burden of risk alleles is strongly associated with age at disease onset. Most loci are either directly associated with risk of inflammatory bowel disease (IBD) or maintenance of the intestinal epithelial barrier and response to mucosal pathogens. The geospatial distribution of risk alleles is highly suggestive of multi-locus adaptation, and genetic risk correlates strongly with variation in local pathogens, particularly helminth diversity, suggesting a possible role for host-intestinal pathogen interactions in shaping the genetic landscape of IgAN.
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Affiliation(s)
- Krzysztof Kiryluk
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Yifu Li
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Francesco Scolari
- Div. of Nephrology, Azienda Ospedaliera Spedali Civili of Brescia, Montichiari Hospital, Univ of Brescia, Brescia, Italy
- Dept. of Medical and Surgical Specialties, Radiological Sciences, University of Brescia, Brescia, Italy
| | - Simone Sanna-Cherchi
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Murim Choi
- Dept. of Genetics, Yale University School of Medicine, New Haven, Connecticut, USA
- Dept. of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - Miguel Verbitsky
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - David Fasel
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Sneh Lata
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Sindhuri Prakash
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Samantha Shapiro
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Clara Fischman
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Holly J. Snyder
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Gerald Appel
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Claudia Izzi
- Div. of Nephrology, Azienda Ospedaliera Spedali Civili of Brescia, Montichiari Hospital, Univ of Brescia, Brescia, Italy
- Prenatal Diagnosis Unit, Department of Obstetrics and Gynecology, University of Brescia, Brescia, Italy
| | - Battista Fabio Viola
- Div. of Nephrology, Azienda Ospedaliera Spedali Civili of Brescia, Spedali Civili Hospital, Univ of Brescia, Brescia, Italy
| | - Nadia Dallera
- Div. of Nephrology, Azienda Ospedaliera Spedali Civili of Brescia, Montichiari Hospital, Univ of Brescia, Brescia, Italy
- Dept. of Medical and Surgical Specialties, Radiological Sciences, University of Brescia, Brescia, Italy
| | - Lucia Del Vecchio
- Renal Div., DMCO, San Paolo Hospital, School of Medicine, University of Milan, Milan, Italy
| | - Cristina Barlassina
- Renal Div., DMCO, San Paolo Hospital, School of Medicine, University of Milan, Milan, Italy
| | - Erika Salvi
- Renal Div., DMCO, San Paolo Hospital, School of Medicine, University of Milan, Milan, Italy
| | - Francesca Eleonora Bertinetto
- Immunogenetics and Biology of Transplantation, Città della Salute e della Scienza, University Hospital of Turin, Italy
- Medical Genetics, Dept. of Medical Sciences, University of Torino, Torino, Italy
| | - Antonio Amoroso
- Immunogenetics and Biology of Transplantation, Città della Salute e della Scienza, University Hospital of Turin, Italy
- Medical Genetics, Dept. of Medical Sciences, University of Torino, Torino, Italy
| | - Silvana Savoldi
- Nephrology and Dialysis Unit, Ospedali di Cirié e Chivasso, Cirié, Torino, Italy
| | - Marcella Rocchietti
- Nephrology and Dialysis Unit, Ospedali di Cirié e Chivasso, Cirié, Torino, Italy
| | - Alessandro Amore
- Nephrology, Dialysis, and Transplantation Unit, Regina Margheritra Hospital, Torino, Italy
| | - Licia Peruzzi
- Nephrology, Dialysis, and Transplantation Unit, Regina Margheritra Hospital, Torino, Italy
| | - Rosanna Coppo
- Nephrology, Dialysis, and Transplantation Unit, Regina Margheritra Hospital, Torino, Italy
| | - Maurizio Salvadori
- Div. of Nephrology and Renal Transplantation, Carreggi Hospital, Florence, Italy
| | - Pietro Ravani
- Dept. of Medicine, University of Calgary, Calgary, Canada
- Dept. of Community Health Sciences, University of Calgary, Calgary, Canada
| | - Riccardo Magistroni
- Div. of Nephrology Dialysis and Transplantation, Azienda Ospedaliero Universitaria Policlinico di Modena, Università di Modena e Reggio Emilia, Italy
| | - Gian Marco Ghiggeri
- Div. of Nephrology, Dialysis and Transplantation, Giannina Gaslini Institute, Genova, Italy
| | - Gianluca Caridi
- Div. of Nephrology, Dialysis and Transplantation, Giannina Gaslini Institute, Genova, Italy
| | - Monica Bodria
- Div. of Nephrology, Dialysis and Transplantation, Giannina Gaslini Institute, Genova, Italy
| | - Francesca Lugani
- Div. of Nephrology, Dialysis and Transplantation, Giannina Gaslini Institute, Genova, Italy
| | - Landino Allegri
- Div. of Nephrology, Azienda Ospedaliero-Universitaria and Chair of Nephrology, University of Parma, Parma, Italy
| | - Marco Delsante
- Div. of Nephrology, Azienda Ospedaliero-Universitaria and Chair of Nephrology, University of Parma, Parma, Italy
| | - Mariarosa Maiorana
- Div. of Nephrology, Azienda Ospedaliero-Universitaria and Chair of Nephrology, University of Parma, Parma, Italy
| | - Andrea Magnano
- Div. of Nephrology, Azienda Ospedaliero-Universitaria and Chair of Nephrology, University of Parma, Parma, Italy
| | - Giovanni Frasca
- Div. of Nephrology, Dialysis and Renal Transpantation, Riuniti Hospital, Ancona, Italy
| | - Emanuela Boer
- Div. of Nephrology and Dialysis, Gorizia Hospital, Gorizia, Italy
| | - Giuliano Boscutti
- Div. of Nephrology, Azienda Ospedaliero-Universitaria Ospedali Riuniti di Trieste, Trieste, Italy
| | | | - Renzo Mignani
- Div. of Nephrology and Dialysis, Infermi Hospital, Rimini, Italy
| | | | | | - Domenico Santoro
- Div. of Nephology and Dialysis, Chair of Nephrology, University of Messina, Azienda Ospedaliero-Universitaria Policlinico, Messina, Italy
| | - Antonello Pani
- Dept. of Nephrology and Dialysis, G. Brotzu Hospital, Cagliari, Italy
| | - Rosaria Polci
- Nephrology and Dialysis, Hospital of Viterbo, Viterbo, Italy
| | - Sandro Feriozzi
- Nephrology and Dialysis, Hospital of Viterbo, Viterbo, Italy
| | - Silvana Chicca
- Div. of Nephrology and Dialysis, Sandro Pertini Hospital, Rome, Italy
| | - Marco Galliani
- Div. of Nephrology and Dialysis, Sandro Pertini Hospital, Rome, Italy
| | - Maddalena Gigante
- Dept. of Medical and Surgical Sciences, University of Foggia, Foggia, Italy
| | - Loreto Gesualdo
- Section of Nephrology, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | | | - Dita Maixnerová
- Dept. of Nephrology, 1st Faculty of Medicine and General University Hospital, Charles University, Prague, Czech Republic
| | - Vladimir Tesar
- Dept. of Nephrology, 1st Faculty of Medicine and General University Hospital, Charles University, Prague, Czech Republic
| | - Frank Eitner
- Dept. of Nephrology, RWTH University of Aachen, Aachen, Germany
- Kidney Diseases Research, Bayer Pharma AG, Wuppertal, Germany
| | - Thomas Rauen
- Dept. of Nephrology, RWTH University of Aachen, Aachen, Germany
| | - Jürgen Floege
- Dept. of Nephrology, RWTH University of Aachen, Aachen, Germany
| | - Tibor Kovacs
- Nephrology Center, Medical Faculty, University of Pécs, Pécs, Hungary
- Second Dept. of Internal Medicine, Medical Faculty, University of Pécs, Pécs, Hungary
| | - Judit Nagy
- Nephrology Center, Medical Faculty, University of Pécs, Pécs, Hungary
- Second Dept. of Internal Medicine, Medical Faculty, University of Pécs, Pécs, Hungary
| | - Krzysztof Mucha
- Dept. of Immunology, Transplantology, and Internal Medicine, Medical University of Warsaw, Warsaw, Poland
| | - Leszek Pączek
- Dept. of Immunology, Transplantology, and Internal Medicine, Medical University of Warsaw, Warsaw, Poland
| | - Marcin Zaniew
- Children’s Hospital, Krysiewicza 7/8, Poznań, Poland
| | | | | | - Krzysztof Pawlaczyk
- Dept. of Nephrology, Transplantology, and Internal Medicine, Poznan Medical University, Poznan, Poland
| | - Daniel Gale
- University College London-Centre for Nephrology, Royal Free Hospital Pond Street, London
| | - Jonathan Barratt
- The John Walls Renal Unit, University Hospitals of Leicester, Leicester, United Kingdom
- Dept. of Infection, Immunity and Inflammation, University of Leicester, Leicester, United Kingdom
| | - Lise Thibaudin
- Nephrology, Dialysis, and Renal Transplantation Dept., University North Hospital, Saint Etienne, France
| | - Francois Berthoux
- Nephrology, Dialysis, and Renal Transplantation Dept., University North Hospital, Saint Etienne, France
| | - Guillaume Canaud
- Service de Néphrologie Transplantation Adultes, Hôpital Necker - Enfants Malades, Paris, France
- INSERM, Institut Necker Enfants Malades, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Anne Boland
- Centre National de Génotypage, CEA, Institut de Génomique, Evry, France
| | - Marie Metzger
- INSERM, Centre for Research in Epidemiology and Population Health, Villejuif, France and University Paris-Sud, Villejuif, France
| | - Ulf Panzer
- III Medizinische Klinik, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Hitoshi Suzuki
- Division of Nephrology, Dept. of Internal Medicine, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Shin Goto
- Division of Clinical Nephrology and Rheumatology, Niigata University, Niigata, Japan
| | - Ichiei Narita
- Division of Clinical Nephrology and Rheumatology, Niigata University, Niigata, Japan
| | - Yasar Caliskan
- Division of Nephrology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Jingyuan Xie
- Dept. of Nephrology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ping Hou
- Renal Div., Peking University First Hospital, Peking University Institute of Nephrology, Beijing, China
| | - Nan Chen
- Dept. of Nephrology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hong Zhang
- Renal Div., Peking University First Hospital, Peking University Institute of Nephrology, Beijing, China
| | - Robert J. Wyatt
- Div. of Pediatric Nephrology, University of Tennessee Health Sciences Center, Memphis, Tennessee, USA
- Children’s Foundation Research Center, Le Bonheur Children’s Hospital, Memphis, Tennessee, USA
| | - Jan Novak
- Dept. of Microbiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Bruce A. Julian
- Dept. of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - John Feehally
- The John Walls Renal Unit, University Hospitals of Leicester, Leicester, United Kingdom
- Dept. of Infection, Immunity and Inflammation, University of Leicester, Leicester, United Kingdom
| | - Benedicte Stengel
- INSERM, Centre for Research in Epidemiology and Population Health, Villejuif, France and University Paris-Sud, Villejuif, France
| | - Daniele Cusi
- Renal Div., DMCO, San Paolo Hospital, School of Medicine, University of Milan, Milan, Italy
| | - Richard P. Lifton
- Dept. of Genetics, Yale University School of Medicine, New Haven, Connecticut, USA
- Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Ali G. Gharavi
- Dept. of Medicine, Div. of Nephrology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
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Genome-wide scan identifies a copy number variable region at 3p21.1 that influences the TLR9 expression levels in IgA nephropathy patients. Eur J Hum Genet 2014; 23:940-8. [PMID: 25293716 DOI: 10.1038/ejhg.2014.208] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 08/01/2014] [Accepted: 08/29/2014] [Indexed: 11/08/2022] Open
Abstract
Immunoglobulin A nephropathy (IgAN) is a complex multifactorial disease characterized by genetic factors that influence the pathogenesis of the disease. In this context, an intriguing role could be ascribed to copy number variants (CNVs). We performed the whole-genome screening of CNVs in familial IgAN patients, their healthy relatives and healthy subjects (HSs). In the initial screening, we included 217 individuals consisting of 51 biopsy-proven familial IgAN cases and 166 healthy relatives. We identified 148 IgAN-specific aberrations, specifically 105 loss and 43 gain, using a new statistical approach that allowed us to identify aberrations that were concordant across multiple samples. Several CNVs overlapped with regions evidenced by previous genome-wide genetic studies. We focused our attention on a CNV located in chromosome 3, which contains the TLR9 gene and found that IgAN patients characterized by deteriorated renal function carried low copy number of this CNV. Moreover, the TLR9 gene expression was low and significantly correlated with the loss aberration. Conversely, IgAN patients with normal renal function had no aberration and the TLR9 mRNA was expressed at the same level as in HSs. We confirmed our data in another cohort of Greek subjects. In conclusion, here we performed the first genome-wide CNV study in IgAN identifying structural variants that could help the genetic dissection of this complex disease, and pointed out a loss aberration in the chromosome 3, which is responsible for the downregulation of TLR9 expression that, in turn, could contribute to the deterioration of the renal function in IgAN patients.
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Dinic M, Ghisdal L, Racapé J, Thibaudin L, Gatault P, Essig M, Le Meur Y, Noël C, Touchard G, Merville P, Ajarchouh Z, Mariat C, Abramowicz M, Abramowicz D, Alamartine E. UMOD polymorphism rs12917707 is not associated with severe or stable IgA nephropathy in a large Caucasian cohort. BMC Nephrol 2014; 15:138. [PMID: 25163389 PMCID: PMC4236674 DOI: 10.1186/1471-2369-15-138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 05/22/2014] [Indexed: 01/12/2023] Open
Abstract
Background Genetic factors are suspected in the pathogenesis of IgA nephropathy, as well as in the course of IgA nephropathy progression towards end stage renal failure. UMOD polymorphism rs12917707 is known to associate with end stage renal failure of mixed aetiologies. Methods We tested a large cohort of Caucasian patients for association of rs12917707 with IgA nephropathy showing a benign, stable course and with IgA nephropathy that progressed toward end stage renal failure. Results No association was observed between either groups, and a non-significant trend was observed for more severe IgA nephropathy with the allele reported to protect against end stage renal failure of mixed aetiologies. Conclusion We conclude that UMOD is unlikely to play a role in IgA nephropathy pathogenesis nor progression to end stage renal failure, and suggest that UMOD effects are restricted to some causes of renal disease, e.g. diabetes or hypertension.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Eric Alamartine
- Nephrology-Renal Transplantation Department, CHU de Saint Etienne & EA3064, GIMAP, Université Jean Monnet, Saint Etienne 42055 Cedex 02, France.
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Xu R, Feng S, Li Z, Fu Y, Yin P, Ai Z, Liu W, Yu X, Li M. Polymorphism of DEFA in Chinese Han population with IgA nephropathy. Hum Genet 2014; 133:1299-309. [DOI: 10.1007/s00439-014-1464-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 06/12/2014] [Indexed: 12/16/2022]
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Abstract
IgA nephropathy (IgAN) represents the leading cause of kidney failure among East Asian populations and the most frequent form of primary glomerulonephritis among Europeans. Patients with IgAN develop characteristic IgA1-containing immune complexes that deposit in the glomerular mesangium, producing progressive kidney injury. Recent studies define IgAN as an autoimmune trait of complex architecture with a strong genetic determination. This Review summarizes new insights into the role of the O-glycosylation pathway, anti-glycan immune response, mucosal immunity, antigen processing and presentation, and the alternative complement pathway in the pathogenesis of IgAN.
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Hirukawa T, Wu Q, Sawada K, Matsusaka T, Saka S, Oka A, Hirawa N, Umemura S, Kakuta T, Endoh M, Inoko H, Ichikawa I, Fukagawa M. Kidney Diseases Enhance Expression of Tetraspanin-8: A Possible Protective Effect against Tubular Injury. NEPHRON EXTRA 2014; 4:70-81. [PMID: 24926311 PMCID: PMC4036207 DOI: 10.1159/000362451] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Background/Aims TSPAN8 encoding tetraspanin-8 was identified as a candidate gene for immunoglobulin A nephropathy (IgAN) by a genome-wide association study using microsatellites in the Japanese population. Tetraspanin-8 is a cell surface protein that contributes to the migration and invasion of epithelial cells. Methods We performed immunohistochemistry for tetraspanin-8 on human renal biopsy specimens associated with IgAN, antineutrophil cytoplasmic antibody-associated nephropathy and interstitial nephritis, as well as normal renal tissue. Furthermore, to study the potential function of tetraspanin-8, we performed cell migration and invasion assays using human renal tubule cells transfected with tetraspanin-8. Results Tetraspanin-8 was often expressed in vascular smooth muscle cells and occasionally in tubule cells in normal kidney. In the kidneys of all types of nephropathy, tetraspanin-8 staining in the arteries was unaffected, but that in the tubules was enhanced. The degree of tubular staining negatively correlated with the estimated glomerular filtration rate, independently of the type of nephropathy. Tetraspanin-8-expressing tubule cells were found predominantly in distal and collecting tubules, identified by cytokeratin 7 or aquaporin 2 staining. In vitro studies using cultured tubule cells revealed that tetraspanin-8 promoted migration by 2.7-fold without laminin, by 2.8-fold with laminin and invasion into Matrigel by 3.5-fold, suggesting that enhanced tetraspanin-8 may be involved in the repair of tubules. Conclusion The obtained findings indicate that tetraspanin-8 expression is enhanced in injured distal tubules, which may be involved in the repair of tubules by facilitating migration and invasion.
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Affiliation(s)
- Takashi Hirukawa
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Yokohama, Japan
| | - Qiong Wu
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Yokohama, Japan
| | - Kaichiro Sawada
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Yokohama, Japan
| | - Taiji Matsusaka
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Yokohama, Japan
| | - Sanae Saka
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University, Graduate School of Medicine, Yokohama, Japan
| | - Akira Oka
- Department of Molecular Life Science and Molecular Medicine, Tokai University School of Medicine, Isehara, Yokohama, Japan
| | - Nobuhito Hirawa
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University, Graduate School of Medicine, Yokohama, Japan
| | - Satoshi Umemura
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University, Graduate School of Medicine, Yokohama, Japan
| | - Takatoshi Kakuta
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Yokohama, Japan
| | - Masayuki Endoh
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Yokohama, Japan
| | - Hidetoshi Inoko
- Department of Molecular Life Science and Molecular Medicine, Tokai University School of Medicine, Isehara, Yokohama, Japan
| | - Iekuni Ichikawa
- Division of Pediatric Nephrology, Vanderbilt University School of Medicine, Nashville, Tenn., USA
| | - Masafumi Fukagawa
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Yokohama, Japan
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37
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Woo KT, Lau YK, Choong HL, Tan HK, Foo MWY, Lee EJC, Anantharaman V, Lee GSL, Yap HK, Yi Z, Fook-Chong S, Wong KS, Chan CM. Genomics and Disease Progression in IgA Nephritis. ANNALS OF THE ACADEMY OF MEDICINE, SINGAPORE 2013. [DOI: 10.47102/annals-acadmedsg.v42n12p674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Apart from clinical, histological and biochemical indices, genomics are now being employed to unravel the pathogenetic mechanisms in the disease progression of IgA nephritis (IgAN). The results of angiotensin converting enzyme (ACE) gene polymorphism have been controversial. Those patients with the DD genotype seem to have a poorer prognosis. However, with high dose angiotensin receptor blocker (ARB) therapy, the ACE gene polymorphism status of a patient may no longer be a matter for concern as those with the DD genotype would also respond favourably to high dose ARB therapy. Association studies with gene sequencing and haplotypes have suggested that multiple genes are involved in the pathogenesis of IgAN. Some workers have reported a synergistic effect in the combined analysis of AGT-M235T and ACE I/D polymorphism. With the use of deoxyribo nucleic acid (DNA) microarray, tens of thousands of gene expressions genome-wide can be examined together simultaneously. A locus of familial IgAN has been described with strong evidence of linkage to IgAN1 on chromosome 6q22-23. Two other loci were reported at 4q26-31 and 17q12-22. DNA microarray techniques could also help in the identification of specific pathogenic genes that are up- or down-regulated and this may allow genome wide analyses of these genes and their role in the pathogenesis and progression of IgAN. Recently, using genome-wide association studies (GWAS) more loci for disease susceptibility for IgAN have been identified at 17p13, 8p23, 22q12, 1q32 and 6p21.
Key words: Gene sequencing, Haplotypes, Microarray, Single nucleotide polymorphism
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Zhao Yi
- Singapore General Hospital, Singapore
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38
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Ju T, Wang Y, Aryal RP, Lehoux SD, Ding X, Kudelka MR, Cutler C, Zeng J, Wang J, Sun X, Heimburg-Molinaro J, Smith DF, Cummings RD. Tn and sialyl-Tn antigens, aberrant O-glycomics as human disease markers. Proteomics Clin Appl 2013; 7:618-31. [PMID: 23857728 DOI: 10.1002/prca.201300024] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 04/24/2013] [Indexed: 12/12/2022]
Abstract
In many different human disorders, the cellular glycome is altered. An interesting but poorly understood alteration occurs in the mucin-type O-glycome, in which there is aberrant expression of the truncated O-glycans Tn (GalNAcα1-Ser/Thr) and its sialylated version sialyl-Tn (STn) (Neu5Acα2,6GalNAcα1-Ser/Thr). Both Tn and STn are tumor-associated carbohydrate antigens and tumor biomarkers, since they are not expressed normally and appear early in tumorigenesis. Moreover, their expression is strongly associated with poor prognosis and tumor metastasis. The Tn and STn antigens are also expressed in other human diseases and disorders, such as Tn syndrome and IgA nephropathy. The major pathological mechanism for expression of the Tn and STn antigens is compromised T-synthase activity, resulting from alteration of the X-linked gene that encodes for Cosmc, a molecular chaperone specifically required for the correct folding of T-synthase to form active enzyme. This review will summarize our current understanding of the Tn and STn antigens in terms of their biochemistry and role in pathology.
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Affiliation(s)
- Tongzhong Ju
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Yingchun Wang
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | - Rajindra P Aryal
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | - Sylvain D Lehoux
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | - Xiaokun Ding
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | - Matthew R Kudelka
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | - Christopher Cutler
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | - Junwei Zeng
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | - Jianmei Wang
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | - Xiaodong Sun
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | | | - David F Smith
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
| | - Richard D Cummings
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, USA
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39
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Suh JS, Cho SH, Chung JH, Moon A, Park YK, Cho BS. A polymorphism of interleukin-22 receptor alpha-1 is associated with the development of childhood IgA nephropathy. J Interferon Cytokine Res 2013; 33:571-7. [PMID: 23659670 DOI: 10.1089/jir.2012.0097] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Recent studies suggest that dysregulated innate immunity plays an important role in the pathogenesis of immunoglobulin A nephropathy (IgAN). The interleukin-20 subfamily and its receptor, interleukin-22 receptor alpha-1 (IL-22R1), were recently identified as immunomodulators in human diseases, acting as mediators of mucosal host defense. However, the potential role of IL-22R1 in the pathogenesis of IgAN has not been explored. In the current study, 194 patients with IgAN and 287 normal controls were genotyped for coding polymorphisms of the IL-22R1 gene and the association between the polymorphisms and IgAN was investigated. Local expression of IL-22R1 was examined in patients with IgAN and healthy controls using immunohistochemistry. Our case-control analysis showed that genotypes of rs3795299 were associated with childhood IgAN. Individuals with the CC genotype of rs3795299 had about 3-fold reduced risk of IgAN compared with those with the GG genotype in the codominant model (P=0.0028) and those with the genotypes containing the G allele (GG or GC) in the recessive model (P=0.002). After Bonferroni correction, the association between the rs3795299 CC genotype and reduced risk of developing IgAN remained significant. Furthermore, the renal expression of IL-22R1 was significantly higher in healthy controls compared with subjects with IgAN. Our data suggest that the CC genotype of rs3795299 polymorphism in the IL-22R1 gene is associated with the reduced risk of IgAN, and this genetic association was supported by the higher renal expression of IL-22R1 in healthy controls compared with patients with IgAN.
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Affiliation(s)
- Jin-Soon Suh
- 1 Department of Pediatrics, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea , Pucheon-Si, Korea
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40
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Xie J, Shapiro S, Gharavi A. Genetic studies of IgA nephropathy: what have we learned from genome-wide association studies. CONTRIBUTIONS TO NEPHROLOGY 2013; 181:52-64. [PMID: 23689567 DOI: 10.1159/000348652] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Primary IgA nephropathy (IgAN) is the most common glomerulonephritis in the world. It is most common in Asian populations, followed by Caucasians, yet relatively infrequent amongst African populations. The striking difference in the prevalence of IgAN between world populations, together with the known familial aggregation of disease, suggests an inherited mechanism. Recently three genome-wide association studies (GWAS) of IgAN have identified seven susceptibility loci, providing initial insight into the genetic architecture of this trait. While genetic studies of complex traits are challenging, applying new techniques and methods of analysis, especially Next-Generation Sequencing, will push the genetic studies of IgAN forward.
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Affiliation(s)
- Jingyuan Xie
- Department of Nephrology, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai, PR China
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Tan K, Chen J, Li W, Chen Y, Sui W, Zhang Y, Dai Y. Genome-wide analysis of microRNAs expression profiling in patients with primary IgA nephropathy. Genome 2013; 56:161-9. [PMID: 23659700 DOI: 10.1139/gen-2012-0159] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of this study was to investigate the differential expression characteristics and the roles of the genome-wide microRNAs (miRNAs) in immunoglobulin A nephropathy (IgAN) kidney tissues. We used Illumina high-throughput sequencing technology to evaluate the miRNAs expression of six biopsy tissues from IgAN and six normal renal cortex specimens from patients with renal cell carcinoma. We observed a total of 85 miRNAs that were differentially expressed in the six IgAN patients, of which 11 miRNAs were up-regulated and 74 miRNAs were down-regulated in patients' tissues compared with control tissues. Additionally, we identified 55 candidate novel miRNAs in our study, which comprised seven candidates who were detected in the IgAN group and 49 candidates who were detected in the control group. Only one candidate (miR-n-9) was expressed in both groups. The bioinformatics showed that the regulated target genes of differentially expressed miRNAs were associated with immune and renal pathological changes. The identification of specific tissue miRNAs in our study not only helped clarify the genetics or immunology mechanisms involved in the pathogenesis of IgAN but also helped explain the pathological changes in the kidney tissues. We hypothesize that some significant miRNAs might potentially serve as novel diagnostic biomarkers in IgAN patients.
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Affiliation(s)
- Kuibi Tan
- The Second Clinical Medical College, Jinan University, Shenzhen People's Hospital, Shenzhen, Guangdong Province, P.R. China
| | - Jing Chen
- The Key Laboratory of Stem Cell Biology, Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, Guangdong Province, P.R. China
| | - Wuxian Li
- The Key Laboratory of Laboratory Medical Diagnostics of Education Ministry, Chongqing Medical University, Chongqing Province, P.R. China
| | - Yuyu Chen
- The Second Clinical Medical College, Jinan University, Shenzhen People's Hospital, Shenzhen, Guangdong Province, P.R. China
| | - Weiguo Sui
- The Kidney Transplantation and Hemopurification Center of PLA, 181 Hospital of PLA, Guilin, Guangxi Province, P.R. China
| | - Yang Zhang
- The Kidney Transplantation and Hemopurification Center of PLA, 181 Hospital of PLA, Guilin, Guangxi Province, P.R. China
| | - Yong Dai
- The Second Clinical Medical College, Jinan University, Shenzhen People's Hospital, Shenzhen, Guangdong Province, P.R. China
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42
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Kiryluk K, Novak J, Gharavi AG. Pathogenesis of immunoglobulin A nephropathy: recent insight from genetic studies. Annu Rev Med 2012; 64:339-56. [PMID: 23072577 DOI: 10.1146/annurev-med-041811-142014] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Recent genome-wide association studies (GWAS) have identified multiple susceptibility loci for immunoglobulin A nephropathy (IgAN), the most common form of glomerulonephritis, implicating independent defects in adaptive immunity (three loci on chromosome 6p21 in the MHC region), innate immunity (8p23 DEFA locus, 17p23 TNFSF13 locus, 22q12 HORMAD2 locus), and the alternative complement pathway (1q32 CFH/CFHR locus). In geospatial analysis of 85 populations, a genetic risk score based on the replicated GWAS loci is highest in Asians, intermediate in Europeans, and lowest in Africans, capturing the known difference in prevalence among world populations. The genetic risk score also uncovered a previously unsuspected increased prevalence of IgAN-attributable kidney failure in Northern Europe. The IgAN risk alleles have opposing effects on many immune-mediated diseases, suggesting that selection has contributed to variation in risk allele frequencies among different populations. Incorporating genetic, immunologic, and biochemical data, we present a multistep pathogenesis model that provides testable hypotheses for dissecting the mechanisms of disease.
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Affiliation(s)
- Krzysztof Kiryluk
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.
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43
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Okazaki K, Suzuki Y, Otsuji M, Suzuki H, Kihara M, Kajiyama T, Hashimoto A, Nishimura H, Brown R, Hall S, Novak J, Izui S, Hirose S, Tomino Y. Development of a model of early-onset IgA nephropathy. J Am Soc Nephrol 2012; 23:1364-74. [PMID: 22797187 DOI: 10.1681/asn.2011121160] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
ddY mice spontaneously develop IgA nephropathy (IgAN) with a variable age of disease onset. Establishing a model with early-onset IgAN could aid the investigation of mechanisms that underlie the pathogenesis of this disease. On the basis of histologic grading in serial biopsies, we previously classified ddY mice into early-onset, late-onset, and quiescent groups. Here, we selectively mated mice with the early-onset phenotype for >20 generations and established "grouped ddY" mice that develop IgAN within 8 weeks of age. Similar to human IgAN, the prognosis was worse for male mice than females. These mice homogeneously retained genotypes of four marker loci previously associated with the early-onset phenotype, confirming a close association of these loci with early-onset IgAN in ddY mice. Grouped ddY mice comprised two sublines, however, which had distinct genotypes at a susceptibility locus for high serum IgA levels, which maps within the Ig heavy-chain gene complex. The subline bearing the Igh-2(a) IgA allotype had a more rapid course of fatal disease and lower oligosaccharide content, suggesting that aberrant IgA glycosylation may promote the progression of murine IgAN. Taken together, these data indicate that grouped ddY mice may be a useful model for the identification of susceptibility genes and the underlying molecular mechanisms involved in the pathogenesis of human IgAN.
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Affiliation(s)
- Keiko Okazaki
- Division of Nephrology, Department of Internal Medicine, Juntendo University Faculty of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
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Kiryluk K, Li Y, Sanna-Cherchi S, Rohanizadegan M, Suzuki H, Eitner F, Snyder HJ, Choi M, Hou P, Scolari F, Izzi C, Gigante M, Gesualdo L, Savoldi S, Amoroso A, Cusi D, Zamboli P, Julian BA, Novak J, Wyatt RJ, Mucha K, Perola M, Kristiansson K, Viktorin A, Magnusson PK, Thorleifsson G, Thorsteinsdottir U, Stefansson K, Boland A, Metzger M, Thibaudin L, Wanner C, Jager KJ, Goto S, Maixnerova D, Karnib HH, Nagy J, Panzer U, Xie J, Chen N, Tesar V, Narita I, Berthoux F, Floege J, Stengel B, Zhang H, Lifton RP, Gharavi AG. Geographic differences in genetic susceptibility to IgA nephropathy: GWAS replication study and geospatial risk analysis. PLoS Genet 2012; 8:e1002765. [PMID: 22737082 PMCID: PMC3380840 DOI: 10.1371/journal.pgen.1002765] [Citation(s) in RCA: 270] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Accepted: 04/30/2012] [Indexed: 12/31/2022] Open
Abstract
IgA nephropathy (IgAN), major cause of kidney failure worldwide, is common in Asians, moderately prevalent in Europeans, and rare in Africans. It is not known if these differences represent variation in genes, environment, or ascertainment. In a recent GWAS, we localized five IgAN susceptibility loci on Chr.6p21 (HLA-DQB1/DRB1, PSMB9/TAP1, and DPA1/DPB2 loci), Chr.1q32 (CFHR3/R1 locus), and Chr.22q12 (HORMAD2 locus). These IgAN loci are associated with risk of other immune-mediated disorders such as type I diabetes, multiple sclerosis, or inflammatory bowel disease. We tested association of these loci in eight new independent cohorts of Asian, European, and African-American ancestry (N = 4,789), followed by meta-analysis with risk-score modeling in 12 cohorts (N = 10,755) and geospatial analysis in 85 world populations. Four susceptibility loci robustly replicated and all five loci were genome-wide significant in the combined cohort (P = 5×10−32–3×10−10), with heterogeneity detected only at the PSMB9/TAP1 locus (I2 = 0.60). Conditional analyses identified two new independent risk alleles within the HLA-DQB1/DRB1 locus, defining multiple risk and protective haplotypes within this interval. We also detected a significant genetic interaction, whereby the odds ratio for the HORMAD2 protective allele was reversed in homozygotes for a CFHR3/R1 deletion (P = 2.5×10−4). A seven–SNP genetic risk score, which explained 4.7% of overall IgAN risk, increased sharply with Eastward and Northward distance from Africa (r = 0.30, P = 3×10−128). This model paralleled the known East–West gradient in disease risk. Moreover, the prediction of a South–North axis was confirmed by registry data showing that the prevalence of IgAN–attributable kidney failure is increased in Northern Europe, similar to multiple sclerosis and type I diabetes. Variation at IgAN susceptibility loci correlates with differences in disease prevalence among world populations. These findings inform genetic, biological, and epidemiological investigations of IgAN and permit cross-comparison with other complex traits that share genetic risk loci and geographic patterns with IgAN. IgA nephropathy (IgAN) is the most common cause of kidney failure in Asia, has lower prevalence in Europe, and is very infrequent among populations of African ancestry. A long-standing question in the field is whether these differences represent variation in genes, environment, or ascertainment. In a recent genome-wide association study of 5,966 individuals, we identified five susceptibility loci for this trait. In this paper, we study the largest IgAN case-control cohort reported to date, composed of 10,775 individuals of European, Asian, and African-American ancestry. We confirm that all five loci are significant contributors to disease risk across this multi-ethnic cohort. In addition, we identify two novel independent susceptibility alleles within the HLA-DQB1/DRB1 locus and a new genetic interaction between loci on Chr.1p36 and Chr.22q22. We develop a seven–SNP genetic risk score that explains nearly 5% of variation in disease risk. In geospatial analysis of 85 world populations, the genetic risk score closely parallels worldwide patterns of disease prevalence. The genetic risk score also predicts an unsuspected Northward risk gradient in Europe. This genetic prediction is verified by examination of registry data demonstrating, similarly to other immune-mediated diseases such as multiple sclerosis and type I diabetes, a previously unrecognized increase in IgAN–attributable kidney failure in Northern European countries.
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Affiliation(s)
- Krzysztof Kiryluk
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America
| | - Yifu Li
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America
| | - Simone Sanna-Cherchi
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America
- Department of Medicine, St. Luke's-Roosevelt Hospital Center, New York, New York, United States of America
| | - Mersedeh Rohanizadegan
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America
| | - Hitoshi Suzuki
- Division of Nephrology, Department of Internal Medicine, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Frank Eitner
- Department of Nephrology, RWTH University of Aachen, Aachen, Germany
| | - Holly J. Snyder
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America
| | - Murim Choi
- Department of Genetics, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Ping Hou
- Renal Division, Peking University First Hospital, Peking University Institute of Nephrology, Beijing, China
| | - Francesco Scolari
- University of Brescia and Second Division of Nephrology, Montichiari Hospital, Montichiari, Italy
| | - Claudia Izzi
- University of Brescia and Second Division of Nephrology, Montichiari Hospital, Montichiari, Italy
| | - Maddalena Gigante
- Section of Nephrology, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Loreto Gesualdo
- Section of Nephrology, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | | | - Antonio Amoroso
- Department of Genetics, Biology, and Biochemistry, University of Torino, Torino, Italy
| | - Daniele Cusi
- Renal Division, DMCO, San Paolo Hospital, School of Medicine, University of Milan, Milan, Italy
| | - Pasquale Zamboli
- Department of Nephrology, Second University of Naples, Naples, Italy
| | - Bruce A. Julian
- Departments of Microbiology and Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Jan Novak
- Departments of Microbiology and Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Robert J. Wyatt
- Children's Foundation Research Center, Le Bonheur Children's Hospital, Memphis, Tennessee, United States of America
- Division of Pediatric Nephrology, University of Tennessee Health Sciences Center, Memphis, Tennessee, United States of America
| | - Krzysztof Mucha
- Department of Immunology, Transplantology, and Internal Medicine, Warsaw Medical University, Warsaw, Poland
| | - Markus Perola
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
- Institute for Molecular Medicine Finland FIMM, University of Helsinki, Helsinki, Finland
- The Estonian Genome Center, University of Tartu, Tartu, Estonia
| | - Kati Kristiansson
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
| | - Alexander Viktorin
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Patrik K. Magnusson
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Gudmar Thorleifsson
- deCODE Genetics, Reykjavik, Iceland
- Faculty of Medicine, University of Iceland, Reykjavík, Iceland
| | - Unnur Thorsteinsdottir
- deCODE Genetics, Reykjavik, Iceland
- Faculty of Medicine, University of Iceland, Reykjavík, Iceland
| | - Kari Stefansson
- deCODE Genetics, Reykjavik, Iceland
- Faculty of Medicine, University of Iceland, Reykjavík, Iceland
| | - Anne Boland
- Centre National de Génotypage, CEA, Institut de Génomique, Evry, France
| | - Marie Metzger
- INSERM, Centre for Research in Epidemiology and Population Health, Villejuif, France
| | - Lise Thibaudin
- Nephrology, Dialysis, and Renal Transplantation Department, University North Hospital, Saint Etienne, France
| | - Christoph Wanner
- Department of Medicine, Division of Nephrology, University Hospital, Würzburg, Germany
| | - Kitty J. Jager
- ERA–EDTA Registry, Department of Medical Informatics, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Shin Goto
- Division of Clinical Nephrology and Rheumatology, Niigata University, Niigata, Japan
| | - Dita Maixnerova
- Department of Nephrology, 1st Faculty of Medicine and General University Hospital, Charles University, Prague, Czech Republic
| | - Hussein H. Karnib
- Clinical Research Center and Division of Nephrology, Al Rassoul Al-Aazam Hospital, Beirut, Lebanon
| | - Judit Nagy
- Nephrology Center and 2nd Department of Internal Medicine, Medical Faculty, University of Pécs, Pécs, Hungary
| | - Ulf Panzer
- III Medizinische Klinik, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Jingyuan Xie
- Department of Nephrology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Nan Chen
- Department of Nephrology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Vladimir Tesar
- Department of Nephrology, 1st Faculty of Medicine and General University Hospital, Charles University, Prague, Czech Republic
| | - Ichiei Narita
- Division of Clinical Nephrology and Rheumatology, Niigata University, Niigata, Japan
| | - Francois Berthoux
- Nephrology, Dialysis, and Renal Transplantation Department, University North Hospital, Saint Etienne, France
| | - Jürgen Floege
- Department of Nephrology, RWTH University of Aachen, Aachen, Germany
| | - Benedicte Stengel
- INSERM, Centre for Research in Epidemiology and Population Health, Villejuif, France
| | - Hong Zhang
- Renal Division, Peking University First Hospital, Peking University Institute of Nephrology, Beijing, China
| | - Richard P. Lifton
- Department of Genetics, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Ali G. Gharavi
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America
- * E-mail:
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Wei X, Li Z, Chen W, Mao H, Li Z, Dong X, Tan J, Ling L, Chen A, Guo N, Yu X. Prevalence and risk factors of chronic kidney disease in first-degree relatives of chronic kidney disease patients in Southern China. Nephrology (Carlton) 2012; 17:123-30. [PMID: 21919998 DOI: 10.1111/j.1440-1797.2011.01523.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIM The aim of this study was to estimate the prevalence and risk factors of chronic kidney disease (CKD) in first-degree relatives (FDRs) of CKD patients. METHODS A cross-section study of first-degree relatives of CKD patients was conducted between November 2007 and March 2009 in southern China. A total of 1187 first-degree relatives (494 male and 693 female; mean age 41.26 years) of 419 CKD patients (194 male and 225 female; mean age 32.10 years) were reviewed and tested for haematuria, albuminuria and reduced glomerular filtration rate. CKD risk factors, including age, gender, body mass index, hypertension and the causes of index case were also investigated. CKD was diagnosed according to the criteria of the National Kidney Foundation-Kidney Disease Outcomes Quality Initiative. RESULTS The prevalence of CKD in first-degree relatives of CKD patients was 29.7% (95% confidence interval [CI]: 27.1%-32.2%). After adjusting for all the potential confounders, older age, female gender, hypertension, hyperglycaemia, hyperuricaemia, hypertriglyceridemic, low level of high density lipoproteins, increased body mass index and nephrotoxic medications were independently associated with increased risk of CKD. Furthermore, relatives of index cases with chronic glomerulonephritis were at higher risk haematuria (ORs = 2.12, 95% CI: 1.45-3.10) compared with relatives of index cases with other kinds of renal diseases. CONCLUSION The first-degree relatives of CKD patients are at high risk of CKD, especially those relatives of CKD patients with chronic glomerulonephritis. Screening in this high risk population might help to identify early CKD patients and make a proper intervention strategy to prevent the disease from quick progression.
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Affiliation(s)
- Xin Wei
- Department of Nephrology Epidemiology and Clinical Research Unit, The First Affiliated Hospital Department of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China
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Jiyun Y, Guisen L, Li Z, Yi S, Jicheng L, Fang L, Xiaoqi L, Shi M, Cheng J, Ying L, Haiyan W, Li W, Hong Z, Zhenglin Y. The genetic variants at the HLA-DRB1 gene are associated with primary IgA nephropathy in Han Chinese. BMC MEDICAL GENETICS 2012; 13:33. [PMID: 22578019 PMCID: PMC3407495 DOI: 10.1186/1471-2350-13-33] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Accepted: 05/14/2012] [Indexed: 11/16/2022]
Abstract
Background Immunoglobulin A nephropathy (IgAN), an immune-complex-mediated glomerulonephritis defined immunohistologically by the presence of glomerular IgA deposits, is the most common primary glomerular disease worldwide and a significant cause of end-stage renal disease. Familial clustering of patients with IgAN suggests a genetic predisposition. Methods In this study, 192 patients with IgAN and 192 normal controls in the Sichuan cohort and 935 patients with IgAN and 2,103 normal controls in the Beijing cohort were investigated. HLA-DRB1*01–DRB1*10 specificities were genotyped by the PCR–SSP technique in both cohorts. Based on the HLA-DRB1*04-positive results, the subtypes of HLA-DRB1*04 were analyzed using sequencing-based typing (SBT) in 291 IgAN cases and 420 matched controls. Results The frequency of HLA-DRB1*04 in the IgAN group was significantly higher than that in the control group (0.129 vs. 0.092, P = 8.29 × 10-5, odds ratio (OR) =1.381, 95% confidence interval (CI) 1.178–1.619). Other alleles at the HLA-DRB1 locus were observed with no significant differences between the case and control groups. The dominant alleles of the HLA-DRB1*04 subtypes were DRB1*0405 in both cohorts. The frequencies of HLA-DRB1*0405 and 0403 were significantly increased in the patients compared to healthy subjects. Conclusion HLA-DRB1*04 was significantly associated with primary IgAN in Chinese population. This result implies that HLA-DRB1 gene plays a major role in primary IgAN.
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Affiliation(s)
- Yang Jiyun
- Center for Human Molecular Biology & Genetics, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, Sichuan, 617002, China
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Abstract
Since its first description in 1968, IgA nephropathy has remained the most common form of idiopathic glomerulonephritis leading to chronic kidney disease in developed countries. The exact pathogenesis of IgA nephropathy is still not well defined. Current data implicate an important genetic factor, especially in promoting the overproduction of an aberrant form of IgA1. The immunochemical aberrancy of IgA nephropathy is characterized by the undergalactosylation of O-glycans in the hinge region of IgA1. However, such aberrant glycosylation alone does not cause renal injury. The next stage of disease development requires the formation of glycan-specific IgG and IgA antibodies that recognize the undergalactosylated IgA1 molecule. These antibodies often have reactivity against antigens from extrinsic microorganisms and might arise from recurrent mucosal infection. B cells that respond to mucosal infections, particularly tonsillitis, might produce the nephritogenic IgA1 molecule. With increased immune-complex formation and decreased clearance owing to reduced uptake by the liver, IgA1 binds to the glomerular mesangium via an as yet unidentified receptor. Glomerular IgA1 deposits trigger the local production of cytokines and growth factors, leading to the activation of mesangial cells and the complement system. Emerging data suggest that mesangial-derived mediators following glomerular deposition of IgA1 lead to podocyte and tubulointerstitial injury via mesangio-podocytic-tubular crosstalk. This Review summarizes the latest findings in the pathogenesis of IgA nephropathy.
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Affiliation(s)
- Kar Neng Lai
- Nephrology Center, 10th floor, Li Shu Pui Block, Hong Kong Sanatorium and Hospital, 2 Village Road, Happy Valley, Hong Kong.
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Yu XQ, Li M, Zhang H, Low HQ, Wei X, Wang JQ, Sun LD, Sim KS, Li Y, Foo JN, Wang W, Li ZJ, Yin XY, Tang XQ, Fan L, Chen J, Li RS, Wan JX, Liu ZS, Lou TQ, Zhu L, Huang XJ, Zhang XJ, Liu ZH, Liu JJ. A genome-wide association study in Han Chinese identifies multiple susceptibility loci for IgA nephropathy. Nat Genet 2011; 44:178-82. [PMID: 22197929 DOI: 10.1038/ng.1047] [Citation(s) in RCA: 225] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Accepted: 12/01/2011] [Indexed: 12/18/2022]
Abstract
We performed a two-stage genome-wide association study of IgA nephropathy (IgAN) in Han Chinese, with 1,434 affected individuals (cases) and 4,270 controls in the discovery phase and follow-up of the top 61 SNPs in an additional 2,703 cases and 3,464 controls. We identified associations at 17p13 (rs3803800, P = 9.40 × 10(-11), OR = 1.21; rs4227, P = 4.31 × 10(-10), OR = 1.23) and 8p23 (rs2738048, P = 3.18 × 10(-14), OR = 0.79) that implicated the genes encoding tumor necrosis factor (TNFSF13) and α-defensin (DEFA) as susceptibility genes. In addition, we found multiple associations in the major histocompatibility complex (MHC) region (rs660895, P = 4.13 × 10(-20), OR = 1.34; rs1794275, P = 3.43 × 10(-13), OR = 1.30; rs2523946, P = 1.74 × 10(-11), OR = 1.21) and confirmed a previously reported association at 22q12 (rs12537, P = 1.17 × 10(-11), OR = 0.78). We also found that rs660895 was associated with clinical subtypes of IgAN (P = 0.003), proteinuria (P = 0.025) and IgA levels (P = 0.047). Our findings show that IgAN is associated with variants near genes involved in innate immunity and inflammation.
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Affiliation(s)
- Xue-Qing Yu
- Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.
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Carlsson MC, Bakoush O, Tengroth L, Kilsgård O, Malmström J, Hellmark T, Segelmark M, Leffler H. Galectin-8 in IgA nephritis: decreased binding of IgA by galectin-8 affinity chromatography and associated increased binding in non-IgA serum glycoproteins. J Clin Immunol 2011; 32:246-55. [PMID: 22173878 PMCID: PMC3305883 DOI: 10.1007/s10875-011-9618-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 11/11/2011] [Indexed: 12/18/2022]
Abstract
Background Immunoglobulin A nephritis (IgAN) is the most common primary glomerulonephritis worldwide. It is caused by accumulation of IgA1-containing immune complexes in the kidney resulting in renal failure, which is thought to be due to altered glycosylation of IgA with a decrease of 2–3-sialylated galactosides (NeuAcα2-3Gal). Purpose The purpose of this study was to analyze whether altered glycosylation of IgA would lead to an altered binding to galectin-8, an endogenous lectin with strong affinity for 2–3-sialylated galactosides. Galectins are a family of β-galactoside-binding proteins; by binding various glycoproteins, they play important roles in the regulation of cellular functions in inflammation and immunity. Hence, an altered binding of IgA to galectin-8 could lead to pathologic immune functions, such as glomerulonephritis. Methods Affinity chromatography of serum glycoproteins on the human sialogalactoside-binding lectin galectin-8N permitted quantitation of bound and unbound fractions, including IgA. Results Analysis of ∼100 IgA nephritis sera showed that the galectin-8N unbound fraction of IgA increased compared to ∼100 controls, consistent with the known loss of galactosylation. A subgroup of ∼15% of the IgAN patients had a ratio of galectin-8 bound/unbound IgA <0.09, not found for any of the controls. Unexpectedly, the galectin-8N-binding fraction of serum glycoproteins other than IgA increased in the sera of IgAN patients but not in controls, suggesting a previously unrecognized change in this disease. Conclusion This is the first study that relates a galectin, an endogenous lectin family, to IgA nephritis and thus should stimulate new avenues of research into the pathophysiology of the disease. Electronic supplementary material The online version of this article (doi:10.1007/s10875-011-9618-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Michael C. Carlsson
- Section MIG (Microbiology, Immunology, Glycobiology), Department of Laboratory Medicine, Lund University, Sölvegatan 23, 223 62 Lund, Sweden
| | - Omran Bakoush
- Department of Nephrology, Lund University Hospital, Lund, Sweden
| | - Lotta Tengroth
- Section MIG (Microbiology, Immunology, Glycobiology), Department of Laboratory Medicine, Lund University, Sölvegatan 23, 223 62 Lund, Sweden
| | - Ola Kilsgård
- Department of Immunotechnology, Lund University, Lund, Sweden
| | - Johan Malmström
- Department of Immunotechnology, Lund University, Lund, Sweden
| | - Thomas Hellmark
- Department of Nephrology, Lund University Hospital, Lund, Sweden
| | - Mårten Segelmark
- Department of Nephrology, Lund University Hospital, Lund, Sweden
- Department of Medicine and Health, Linköping University, Linköping, Sweden
| | - Hakon Leffler
- Section MIG (Microbiology, Immunology, Glycobiology), Department of Laboratory Medicine, Lund University, Sölvegatan 23, 223 62 Lund, Sweden
- Department of Clinical Immunology and Transfusion Medicine, Skåne University Hospital SUS., Lund, Sweden
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