1
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Zhang J, Wang Y, Zhao Y, Liu F. A new atypical splice mutation in PKD2 leading to autosomal dominant polycystic kidney disease in a Chinese family. Singapore Med J 2024; 65:229-234. [PMID: 34749493 PMCID: PMC11132625 DOI: 10.11622/smedj.2021162] [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: 01/28/2018] [Accepted: 07/25/2021] [Indexed: 02/05/2023]
Abstract
INTRODUCTION Autosomal dominant polycystic kidney disease (ADPKD) is a very common hereditary renal disorder. Mutations in PKD1 and PKD2 , identified as disease-causing genes, account for 85% and 15% of the ADPKD cases, respectively. METHODS In this study, the mutation analysis of polycystic kidney disease (PKD) genes was performed in a Chinese family with suspected ADPKD using targeted clinical exome sequencing (CES). The candidate pathogenic variants were further tested by using Sanger sequencing and validated for co-segregation. In addition, reverse transcription-polymerase chain reaction (RT-PCR) was performed to test for abnormal splicing and assess its potential pathogenicity. RESULTS A novel atypical splicing mutation that belongs to unclassified variants (UCVs), IVS6+5G>C, was identified in three family members by CES and was shown to co-segregate only with the affected individuals. The RT-PCR revealed the abnormal splicing of exon 6, which thus caused truncating mutation. These findings suggested that the atypical splice site alteration, IVS6+5G>C, in the PKD2 gene was the potential pathogenic mutation leading to ADPKD in this Chinese family. CONCLUSION The data available in this study provided strong evidence that IVS6+5G>C is the potential pathogenic mutation for ADPKD. In addition, our findings emphasised the significance of functional analysis of UCVs and genotype-phenotype correlation in ADPKD.
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Affiliation(s)
- Junlin Zhang
- Division of Nephrology, West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Yiting Wang
- Division of Nephrology, West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Yingwang Zhao
- Joy Orient Translational Medicine Research Center Co Ltd, Beijing, China
| | - Fang Liu
- Division of Nephrology, West China Hospital of Sichuan University, Chengdu, Sichuan, China
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2
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Kocaaga A, Atikel YÖ, Sak M, Karakaya T. The genetic spectrum of polycystic kidney disease in children. REVISTA DA ASSOCIACAO MEDICA BRASILEIRA (1992) 2023; 69:e20230334. [PMID: 37909612 PMCID: PMC10610762 DOI: 10.1590/1806-9282.20230334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 08/11/2023] [Indexed: 11/03/2023]
Abstract
OBJECTIVE Autosomal dominant polycystic kidney disease is an inherited kidney disorder with mutations in polycystin-1 or polycystin-2. Autosomal recessive polycystic kidney disease is a severe form of polycystic kidney disease that is characterized by enlarged kidneys and congenital hepatic fibrosis. Mutations at PKHD1 are responsible for all typical forms of autosomal recessive polycystic kidney disease. METHODS We evaluated the children diagnosed with polycystic kidney disease between October 2020 and May 2022. The diagnosis was established by family history, ultrasound findings, and/or genetic analysis. The demographic, clinical, and laboratory findings were evaluated retrospectively. RESULTS There were 28 children (male/female: 11:17) evaluated in this study. Genetic analysis was performed in all patients (polycystin-1 variants in 13, polycystin-2 variants in 7, and no variants in 8 patients). A total of 18 variants in polycystin-1 and polycystin-2 were identified and 9 (50%) of them were not reported before. A total of eight novel variants were identified as definite pathogenic or likely pathogenic mutations. There was no variant detected in the PKDH1 gene. CONCLUSION Our results highlighted molecular features of Turkish children with polycystic kidney disease and demonstrated novel variations that can be utilized in clinical diagnosis and prognosis.
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Affiliation(s)
- Ayca Kocaaga
- Eskisehir City Hospital, Department of Medical Genetics – Eskişehir, Turkey
| | | | - Mehtap Sak
- Isparta City Hospital, Department of Pediatric Nephrology – Isparta, Turkey
| | - Taner Karakaya
- Isparta City Hospital, Department of Medical Genetics, – Isparta, Turkey
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3
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Tekguc M, Gaal RCVAN, Uzel SGM, Gupta N, Riella LV, Lewis JA, Morizane R. Kidney organoids: a pioneering model for kidney diseases. Transl Res 2022; 250:1-17. [PMID: 35750295 PMCID: PMC9691572 DOI: 10.1016/j.trsl.2022.06.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 06/14/2022] [Accepted: 06/16/2022] [Indexed: 11/18/2022]
Abstract
The kidney is a vital organ that regulates the bodily fluid and electrolyte homeostasis via tailored urinary excretion. Kidney injuries that cause severe or progressive chronic kidney disease have driven the growing population of patients with end-stage kidney disease, leading to substantial patient morbidity and mortality. This irreversible kidney damage has also created a huge socioeconomical burden on the healthcare system, highlighting the need for novel translational research models for progressive kidney diseases. Conventional research methods such as in vitro 2D cell culture or animal models do not fully recapitulate complex human kidney diseases. By contrast, directed differentiation of human induced pluripotent stem cells enables in vitro generation of patient-specific 3D kidney organoids, which can be used to model acute or chronic forms of hereditary, developmental, and metabolic kidney diseases. Furthermore, when combined with biofabrication techniques, organoids can be used as building blocks to construct vascularized kidney tissues mimicking their in vivo counterpart. By applying gene editing technology, organoid building blocks may be modified to minimize the process of immune rejection in kidney transplant recipients. In the foreseeable future, the universal kidney organoids derived from HLA-edited/deleted induced pluripotent stem cell (iPSC) lines may enable the supply of bioengineered organotypic kidney structures that are immune-compatible for the majority of the world population. Here, we summarize recent advances in kidney organoid research coupled with novel technologies such as organoids-on-chip and biofabrication of 3D kidney tissues providing convenient platforms for high-throughput drug screening, disease modelling, and therapeutic applications.
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Affiliation(s)
- Murat Tekguc
- Nephrology Division, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts; Harvard Stem Cell Institute (HSCI), Cambridge, Massachusetts
| | - Ronald C VAN Gaal
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts; School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts
| | - Sebastien G M Uzel
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts; School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts
| | - Navin Gupta
- Nephrology Division, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts; Harvard Stem Cell Institute (HSCI), Cambridge, Massachusetts
| | - Leonardo V Riella
- Nephrology Division, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts; Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts
| | - Jennifer A Lewis
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts; School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts
| | - Ryuji Morizane
- Nephrology Division, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts; Harvard Stem Cell Institute (HSCI), Cambridge, Massachusetts; Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts.
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4
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Hosseinpour M, Ardalani F, Mohseni M, Beheshtian M, Arzhangi S, Ossareh S, Najmabadi H, Nobakht A, Kahrizi K, Broumand B. Targeted Next Generation Sequencing Revealed Novel Variants in the PKD1 and PKD2 Genes of Iranian Patients with Autosomal Dominant Polycystic Kidney Disease. ARCHIVES OF IRANIAN MEDICINE 2022; 25:600-608. [PMID: 37543885 PMCID: PMC10685772 DOI: 10.34172/aim.2022.95] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 04/10/2022] [Indexed: 08/07/2023]
Abstract
BACKGROUND Autosomal dominant polycystic kidney disease (ADPKD), one of the common inherited disorders in humans, is characterized by the development and enlargement of renal cysts, often leading to end-stage renal disease (ESRD). In this study, Iranian ADPKD families were subjected to high-throughput DNA sequencing to find potential causative variants facilitating the way toward risk assessment and targeted therapy. METHODS Our protocol was based on the targeted next generation sequencing (NGS) panel previously developed in our center comprising 12 genes involved in PKD. This panel has been applied to investigate the genetic causes of 32 patients with a clinical suspicion of ADPKD. RESULTS We identified a total of 31 variants for 32 individuals, two of which were each detected in two individuals. Twenty-seven out of 31 detected variants were interpreted as pathogenic/likely pathogenic and the remaining 4 of uncertain significance with a molecular diagnostic success rate of 87.5%. Among these variants, 25 PKD1/2 pathogenic/likely pathogenic variants were detected in 32 index patients (78.1%), and variants of uncertain significance in four individuals (12.5% in PKD1/2). The majority of variants was identified in PKD1 (74.2%). Autosomal recessive PKD was identified in one patient, indicating the similarities between recessive and dominant PKD. In concordance with earlier studies, this biallelic PKD1 variant, p.Arg3277Cys, leads to rapidly progressive and severe disease with very early-onset ADPKD. CONCLUSION Our findings suggest that targeted gene panel sequencing is expected to be the method of choice to improve diagnostic and prognostic accuracy in PKD patients with heterogeneity in genetic background.
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Affiliation(s)
- Maryam Hosseinpour
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Fariba Ardalani
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Marzieh Mohseni
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Maryam Beheshtian
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Sanaz Arzhangi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Shahrzad Ossareh
- Division of Nephrology, Department of Medicine, Hasheminejad Kidney Center, Iran University of Medical Sciences, Tehran, Iran
| | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Ali Nobakht
- Department of Nephrology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Kimia Kahrizi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Behrooz Broumand
- Pars Advanced and Minimally Invasive Medical Manners Research Center, Pars Hospital, Tehran, Iran
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5
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Cantero MDR, Cantiello HF. Polycystin-2 (TRPP2): Ion channel properties and regulation. Gene 2022; 827:146313. [PMID: 35314260 DOI: 10.1016/j.gene.2022.146313] [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: 09/09/2021] [Revised: 01/19/2022] [Accepted: 02/08/2022] [Indexed: 12/01/2022]
Abstract
Polycystin-2 (TRPP2, PKD2, PC2) is the product of the PKD2 gene, whose mutations cause Autosomal Dominant Polycystic Kidney Disease (ADPKD). PC2 belongs to the superfamily of TRP (Transient Receptor Potential) proteins that generally function as Ca2+-permeable nonselective cation channels implicated in Ca2+ signaling. PC2 localizes to various cell domains with distinct functions that likely depend on interactions with specific channel partners. Functions include receptor-operated, nonselective cation channel activity in the plasma membrane, intracellular Ca2+ release channel activity in the endoplasmic reticulum (ER), and mechanosensitive channel activity in the primary cilium of renal epithelial cells. Here we summarize our current understanding of the properties of PC2 and how other transmembrane and cytosolic proteins modulate this activity, providing functional diversity and selective regulatory mechanisms to its role in the control of cellular Ca2+ homeostasis.
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Affiliation(s)
- María Del Rocío Cantero
- Laboratorio de Canales Iónicos, Instituto Multidisciplinario de Salud, Tecnología y Desarrollo (IMSaTeD, CONICET-UNSE), El Zanjón, Santiago del Estero 4206, Argentina.
| | - Horacio F Cantiello
- Laboratorio de Canales Iónicos, Instituto Multidisciplinario de Salud, Tecnología y Desarrollo (IMSaTeD, CONICET-UNSE), El Zanjón, Santiago del Estero 4206, Argentina
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6
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Kim H, Kim HH, Chang CL, Song SH, Kim N. Novel PKD1 Mutations in Patients with Autosomal Dominant Polycystic Kidney Disease. Lab Med 2020; 52:174-180. [PMID: 32816041 DOI: 10.1093/labmed/lmaa047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
OBJECTIVE Autosomal dominant polycystic kidney disease (ADPKD) is the most common genetic kidney disease. Identifying mutated causative genes can provide diagnostic and prognostic information. In this study, we describe the clinical application of a next generation sequencing (NGS)-based, targeted multi-gene panel test for the genetic diagnosis of patients with ADPKD. METHODS We applied genetic analysis on 26 unrelated known or suspected patients with ADPKD. A total of 10 genes related to cystic change of kidney were targeted. Detected variants were classified according to standard guidelines. RESULTS We identified 19 variants (detection rate: 73.1%), including PKD1 (n = 18) and PKD2 (n = 1). Of the 18 PKD1 variants, 8 were novel. CONCLUSION Multigene panel test can be a comprehensive tool in a clinical setting for genetic diagnosis of ADPKD. It allows us to identify clinically significant novel variants and confirm the diagnosis, and these objectives are difficult to achieve using conventional diagnostic tools.
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Affiliation(s)
- Hyerin Kim
- Department of Laboratory Medicine, Pusan National University Hospital, Busan, Korea.,Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Hyung-Hoi Kim
- Department of Laboratory Medicine, Pusan National University Hospital, Busan, Korea.,Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Chulhun L Chang
- Department of Laboratory Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea
| | - Sang Heon Song
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.,Division of Nephrology, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
| | - Namhee Kim
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.,Department of Laboratory Medicine, Dong-A University College of Medicine, Busan, Korea
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7
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García-Rabaneda C, Martínez-Atienza M, Morales-García AI, Poyatos-Andújar A, García-Linares S, Bellido-Díaz ML, Argüelles-Toledo I, García-Valverde M, Bravo-Soto JA, Esteban-de-la-Rosa RJ. New mutation associated with autosomal dominant polycystic kidney disease with founder effect located in the alpujarra region of granada. Nefrologia 2020; 40:536-542. [PMID: 32505451 DOI: 10.1016/j.nefro.2020.03.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 02/27/2020] [Accepted: 03/03/2020] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVE To demonstrate that the variant not described in PKD1 gene c.7292T> A, identified in four families from the Alpujarra in Granada, is the cause of autosomal dominant polycystic kidney disease (ADPKD). This variant consists of a transversion of thymine (T) by adenine (A) that at the level of the Polycystin 1 protein produces a change of leucine (Leu / L) by Glutamine (Gln / Q) in position 2431 (p.Leu2431Gln). METHOD Sociodemographic and clinical variables were registered using clinical histories, genealogical trees, ultrasounds and genetic analysis to ADPKD and healthy individuals belonging to these families in the context of segregation study. RESULTS All PKD individuals carried the c.7292T>A variant in heterozygosis, whereas healthy ones did not. Among all ADPKD patients, 62.9% were women. ADPKD diagnosis was made at 29.3 ± 15.82 years, after having the first child in 64.8%. The main reasons for diagnosis were family history and hematuria episodes. The onset of renal replacement therapy (RRT) occurred at 55.8 ± 7.62 years (range 44-67), and death at 63 ± 92.2 years (range 48-76), being the cause unknown, cardiovascular and insufficiency kidney the most frequent; the median of renal survival was established at 58.5 ± 0.77 years and the median survival of patients at 67.2 ± 3.54 years. No differences in kidney and patient survivals were observed according to sex. Among deceased patients, 52.2% required RRT and 94.4% suffered from renal failure. CONCLUSIONS The variant c.7292T>A in PKD1 gene is responsible for the disease, and its distribution in the Alpujarra region of Granada suggests a founder effect. In ADPKD it is necessary to perform segregation studies that help us to reclassify genetic variants, in this case from indeterminate to pathogenic.
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Affiliation(s)
- Carmen García-Rabaneda
- Laboratorio de Genética Molecular. Hospitales Universitarios San Cecilio y Virgen de las Nieves de Granada, España.
| | - Margarita Martínez-Atienza
- Laboratorio de Genética Molecular. Hospitales Universitarios San Cecilio y Virgen de las Nieves de Granada, España
| | | | - Antonio Poyatos-Andújar
- Laboratorio de Genética Molecular. Hospitales Universitarios San Cecilio y Virgen de las Nieves de Granada, España
| | - Susana García-Linares
- Laboratorio de Genética Molecular. Hospitales Universitarios San Cecilio y Virgen de las Nieves de Granada, España
| | - María Luz Bellido-Díaz
- Laboratorio de Genética Molecular. Hospitales Universitarios San Cecilio y Virgen de las Nieves de Granada, España
| | | | | | - Juan A Bravo-Soto
- Nefrología, Hospital Universitario Virgen de las Nieves de Granada, España
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8
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Mantovani V, Bin S, Graziano C, Capelli I, Minardi R, Aiello V, Ambrosini E, Cristalli CP, Mattiaccio A, Pariali M, De Fanti S, Faletra F, Grosso E, Cantone R, Mancini E, Mencarelli F, Pasini A, Wischmeijer A, Sciascia N, Seri M, La Manna G. Gene Panel Analysis in a Large Cohort of Patients With Autosomal Dominant Polycystic Kidney Disease Allows the Identification of 80 Potentially Causative Novel Variants and the Characterization of a Complex Genetic Architecture in a Subset of Families. Front Genet 2020; 11:464. [PMID: 32457805 PMCID: PMC7224062 DOI: 10.3389/fgene.2020.00464] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 04/15/2020] [Indexed: 11/13/2022] Open
Abstract
Introduction: Autosomal dominant polycystic kidney disease (ADPKD) is one of the most common inherited disorders in humans and the majority of patients carry a variant in either PKD1 or PKD2. Genetic testing is increasingly required for diagnosis, prognosis, and treatment decision, but it is challenging due to segmental duplications of PKD1, genetic and allelic heterogeneity, and the presence of many variants hypomorphic or of uncertain significance. We propose an NGS-based testing strategy for molecular analysis of ADPKD and its phenocopies, validated in a diagnostic setting. Materials and Methods: Our protocol is based on high-throughput simultaneous sequencing of PKD1 and PKD2 after long range PCR of coding regions, followed by a masked reference genome alignment, and MLPA analysis. A further screening of additional 14 cystogenes was performed in negative cases. We applied this strategy to analyze 212 patients with a clinical suspicion of ADPKD. Results and Discussion: We detected causative variants (interpreted as pathogenic/likely pathogenic) in 61.3% of our index patients, and variants of uncertain clinical significance in 12.5%. The majority (88%) of genetic variants was identified in PKD1, 12% in PKD2. Among 158 distinct variants, 80 (50.6%) were previously unreported, confirming broad allelic heterogeneity. Eleven patients showed more than one variant. Segregation analysis indicated biallelic disease in five patients, digenic in one, de novo variant with unknown phase in two. Furthermore, our NGS protocol allowed the identification of two patients with somatic mosaicism, which was undetectable with Sanger sequencing. Among patients without PKD1/PKD2 variants, we identified three with possible alternative diagnosis: a patient with biallelic mutations in PKHD1, confirming the overlap between recessive and dominant PKD, and two patients with variants in ALG8 and PRKCSH, respectively. Genotype-phenotype correlations showed that patients with PKD1 variants predicted to truncate (T) the protein experienced end-stage renal disease 9 years earlier than patients with PKD1 non-truncating (NT) mutations and >13 years earlier than patients with PKD2 mutations. ADPKD-PKD1 T cases showed a disease onset significantly earlier than ADPKD-PKD1 NT and ADPK-PKD2, as well as a significant earlier diagnosis. These data emphasize the need to combine clinical information with genetic data to achieve useful prognostic predictions.
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Affiliation(s)
- Vilma Mantovani
- Medical Genetics Unit, S. Orsola-Malpighi University Hospital, Bologna, Italy.,Center for Applied Biomedical Research (CRBA), University of Bologna, Bologna, Italy
| | - Sofia Bin
- Center for Applied Biomedical Research (CRBA), University of Bologna, Bologna, Italy.,Nephrology, Dialysis and Transplantation Unit, Department of Experimental, Diagnostic and Specialty Medicine (DIMES), S. Orsola-Malpighi University Hospital, Bologna, Italy
| | - Claudio Graziano
- Medical Genetics Unit, S. Orsola-Malpighi University Hospital, Bologna, Italy
| | - Irene Capelli
- Nephrology, Dialysis and Transplantation Unit, Department of Experimental, Diagnostic and Specialty Medicine (DIMES), S. Orsola-Malpighi University Hospital, Bologna, Italy
| | - Raffaella Minardi
- Center for Applied Biomedical Research (CRBA), University of Bologna, Bologna, Italy.,Nephrology, Dialysis and Transplantation Unit, Department of Experimental, Diagnostic and Specialty Medicine (DIMES), S. Orsola-Malpighi University Hospital, Bologna, Italy
| | - Valeria Aiello
- Nephrology, Dialysis and Transplantation Unit, Department of Experimental, Diagnostic and Specialty Medicine (DIMES), S. Orsola-Malpighi University Hospital, Bologna, Italy
| | - Enrico Ambrosini
- Medical Genetics Unit, S. Orsola-Malpighi University Hospital, Bologna, Italy
| | - Carlotta Pia Cristalli
- Center for Applied Biomedical Research (CRBA), University of Bologna, Bologna, Italy.,Nephrology, Dialysis and Transplantation Unit, Department of Experimental, Diagnostic and Specialty Medicine (DIMES), S. Orsola-Malpighi University Hospital, Bologna, Italy
| | - Alessandro Mattiaccio
- Center for Applied Biomedical Research (CRBA), University of Bologna, Bologna, Italy
| | - Milena Pariali
- Center for Applied Biomedical Research (CRBA), University of Bologna, Bologna, Italy
| | - Sara De Fanti
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy
| | - Flavio Faletra
- Medical Genetics Unit, Institute for Maternal and Child Health - IRCCS "Burlo Garofolo", Trieste, Italy
| | - Enrico Grosso
- Medical Genetics Unit, AOU Città della Salute e della Scienza, Turin, Italy
| | - Rachele Cantone
- Medical Genetics Unit, AOU Città della Salute e della Scienza, Turin, Italy
| | - Elena Mancini
- Nephrology, Dialysis and Hypertension Unit, S. Orsola-Malpighi University Hospital, Bologna, Italy
| | | | - Andrea Pasini
- Pediatrics Unit, S. Orsola-Malpighi University Hospital, Bologna, Italy
| | - Anita Wischmeijer
- Clinical Genetics Service and South Tyrol Coordination Center for Rare Diseases, Department of Pediatrics, Regional Hospital of Bolzano, Bolzano, Italy
| | - Nicola Sciascia
- Radiology Unit, S. Orsola-Malpighi University Hospital, Bologna, Italy
| | - Marco Seri
- Center for Applied Biomedical Research (CRBA), University of Bologna, Bologna, Italy
| | - Gaetano La Manna
- Nephrology, Dialysis and Transplantation Unit, Department of Experimental, Diagnostic and Specialty Medicine (DIMES), S. Orsola-Malpighi University Hospital, Bologna, Italy
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9
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Matsushima N, Takatsuka S, Miyashita H, Kretsinger RH. Leucine Rich Repeat Proteins: Sequences, Mutations, Structures and Diseases. Protein Pept Lett 2019; 26:108-131. [PMID: 30526451 DOI: 10.2174/0929866526666181208170027] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 11/26/2018] [Accepted: 11/26/2018] [Indexed: 12/18/2022]
Abstract
Mutations in the genes encoding Leucine Rich Repeat (LRR) containing proteins are associated with over sixty human diseases; these include high myopia, mitochondrial encephalomyopathy, and Crohn's disease. These mutations occur frequently within the LRR domains and within the regions that shield the hydrophobic core of the LRR domain. The amino acid sequences of fifty-five LRR proteins have been published. They include Nod-Like Receptors (NLRs) such as NLRP1, NLRP3, NLRP14, and Nod-2, Small Leucine Rich Repeat Proteoglycans (SLRPs) such as keratocan, lumican, fibromodulin, PRELP, biglycan, and nyctalopin, and F-box/LRR-repeat proteins such as FBXL2, FBXL4, and FBXL12. For example, 363 missense mutations have been identified. Replacement of arginine, proline, or cysteine by another amino acid, or the reverse, is frequently observed. The diverse effects of the mutations are discussed based on the known structures of LRR proteins. These mutations influence protein folding, aggregation, oligomerization, stability, protein-ligand interactions, disulfide bond formation, and glycosylation. Most of the mutations cause loss of function and a few, gain of function.
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Affiliation(s)
- Norio Matsushima
- Center for Medical Education, Sapporo Medical University, Sapporo 060-8556, Japan.,Institute of Tandem Repeats, Noboribetsu 059-0464, Japan
| | - Shintaro Takatsuka
- Center for Medical Education, Sapporo Medical University, Sapporo 060-8556, Japan
| | - Hiroki Miyashita
- Institute of Tandem Repeats, Noboribetsu 059-0464, Japan.,Hokubu Rinsho Co., Ltd, Sapporo 060-0061, Japan
| | - Robert H Kretsinger
- Department of Biology, University of Virginia, Charlottesville, VA 22904, United States
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10
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Valentine MS, Yano J, Van Houten J. A Novel Role for Polycystin-2 (Pkd2) in P. tetraurelia as a Probable Mg 2+ Channel Necessary for Mg 2+-Induced Behavior. Genes (Basel) 2019; 10:genes10060455. [PMID: 31207979 PMCID: PMC6627415 DOI: 10.3390/genes10060455] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 06/05/2019] [Accepted: 06/11/2019] [Indexed: 01/26/2023] Open
Abstract
A human ciliopathy gene codes for Polycystin-2 (Pkd2), a non-selective cation channel. Here, the Pkd2 channel was explored in the ciliate Paramecium tetraurelia using combinations of RNA interference, over-expression, and epitope-tagging, in a search for function and novel interacting partners. Upon depletion of Pkd2, cells exhibited a phenotype similar to eccentric (XntA1), a Paramecium mutant lacking the inward Ca2+-dependent Mg2+ conductance. Further investigation showed both Pkd2 and XntA localize to the cilia and cell membrane, but do not require one another for trafficking. The XntA-myc protein co-immunoprecipitates Pkd2-FLAG, but not vice versa, suggesting two populations of Pkd2-FLAG, one of which interacts with XntA. Electrophysiology data showed that depletion and over-expression of Pkd2 led to smaller and larger depolarizations in Mg2+ solutions, respectively. Over-expression of Pkd2-FLAG in the XntA1 mutant caused slower swimming, supporting an increase in Mg2+ permeability, in agreement with the electrophysiology data. We propose that Pkd2 in P. tetraurelia collaborates with XntA for Mg2+-induced behavior. Our data suggest Pkd2 is sufficient and necessary for Mg2+ conductance and membrane permeability to Mg2+, and that Pkd2 is potentially a Mg2+-permeable channel.
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Affiliation(s)
- Megan S Valentine
- State University of New York at Plattsburgh, 101 Broad Street, Plattsburgh, NY 12901, USA.
| | - Junji Yano
- University of Vermont, Department of Biology, 120 Marsh Life Science, 109 Carrigan Drive, Burlington, VT 05405, USA.
| | - Judith Van Houten
- University of Vermont, Department of Biology, 120 Marsh Life Science, 109 Carrigan Drive, Burlington, VT 05405, USA.
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Bitarafan F, Garshasbi M. Molecular genetic analysis of polycystic kidney disease 1 and polycystic kidney disease 2 mutations in pedigrees with autosomal dominant polycystic kidney disease. JOURNAL OF RESEARCH IN MEDICAL SCIENCES : THE OFFICIAL JOURNAL OF ISFAHAN UNIVERSITY OF MEDICAL SCIENCES 2019; 24:44. [PMID: 31160911 PMCID: PMC6540774 DOI: 10.4103/jrms.jrms_835_18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 01/08/2019] [Accepted: 02/25/2019] [Indexed: 11/04/2022]
Abstract
BACKGROUND Dysfunction of polycystin-1 or polycystin-2, the proteins encoded by polycystic kidney disease 1 (PKD1) and PKD2, respectively, are the cause of autosomal dominant PKD (ADPKD). This genetically heterogeneous monogenic disorder is the most common inherited kidney disease. The disease manifests are progressive cyst growth, renal enlargement, and renal failure, due to abnormal proliferation of kidney tubular epithelium. MATERIALS AND METHODS In this study, mutation analysis of PKD1 and PKD2 genes in nine Iranian families was performed using next-generation sequencing. All patients met the diagnostic criteria of ADPKD. RESULTS Mutations were found in all 9 families in PKD1 gene, comprising 2 novel and 7 previously reported mutations. No mutation in PKD2 was identified. CONCLUSION Finding more mutations and expanding the spectrum of PKD1 and PKD2 mutations can increase the diagnostic value of molecular testing in the screening of ADPKD patients.
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Affiliation(s)
- Fatemeh Bitarafan
- Department of Cellular and Molecular Biology, North Tehran Branch, Islamic Azad University, Teheran, Iran
| | - Masoud Garshasbi
- Department of Medical Genetics, Faculty of Medical Sciences, Tarbiat Modares University, Teheran, Iran
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12
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Wang T, Li Q, Shang S, Geng G, Xie Y, Cai G, Chen X. Identifying gene mutations of Chinese patients with polycystic kidney disease through targeted next-generation sequencing technology. Mol Genet Genomic Med 2019; 7:e720. [PMID: 31056860 PMCID: PMC6565597 DOI: 10.1002/mgg3.720] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 04/16/2019] [Accepted: 04/18/2019] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Polycystic kidney disease (PKD) is the most common hereditary kidney disease. The main mutational genes causing autosomal dominant polycystic kidney disease (ADPKD) are PKD1 and PKD2 as well as some rare pathogenic genes. Unilateral PKD is rare in clinics, and its association with gene mutations is unclear. METHODS Targeted next-generation sequencing (NGS) was performed to detect the renal ciliopathy-associated genes (targeted NGS panel including 63 genes) in PKD patients. RESULTS Forty-eight PKD1 and PKD2 mutation sites were detected in 44 bilateral PKD patients, of which 48 were PKD1 mutation sites (87.5%) and six were PKD2 mutation sites (12.5%). All of which exhibited typical ADPKD. Furthermore, we detected HNF1B heterozygous mutations in three families. Although these three patients showed HNF1B heterozygous mutations, their clinical characteristics differed and showed phenotypic heterogeneity. CONCLUSIONS Targeted NGS panel was helpful in detecting typical ADPKD patients and even in non-typical PKD patients. Macromutation in HNF1B may lead to bilateral PKD. The 16 novel PKD gene mutation sites and two novel PKD2 gene mutation sites discovered in this study have some significance in genetic counseling for ADPKD patients, and increase the number of studied families and expand the mutation database of ADPKD.
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Affiliation(s)
- Tao Wang
- Department of Nephrology, Chinese PLA General Hospital, Medical School of Chinese PLA, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing, China
| | - Qinggang Li
- Department of Nephrology, Chinese PLA General Hospital, Medical School of Chinese PLA, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing, China
| | - Shunlai Shang
- Department of Nephrology, Chinese PLA General Hospital, Medical School of Chinese PLA, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing, China
| | - Guangrui Geng
- Department of Nephrology, Chinese PLA General Hospital, Medical School of Chinese PLA, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing, China
| | - Yuansheng Xie
- Department of Nephrology, Chinese PLA General Hospital, Medical School of Chinese PLA, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing, China
| | - Guangyan Cai
- Department of Nephrology, Chinese PLA General Hospital, Medical School of Chinese PLA, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing, China
| | - Xiangmei Chen
- Department of Nephrology, Chinese PLA General Hospital, Medical School of Chinese PLA, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing, China
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Population data improves variant interpretation in autosomal dominant polycystic kidney disease. Genet Med 2018; 21:1425-1434. [PMID: 30369598 DOI: 10.1038/s41436-018-0324-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 09/17/2018] [Indexed: 11/09/2022] Open
Abstract
PURPOSE Autosomal dominant polycystic kidney disease (ADPKD) is a common adult-onset monogenic disorder, with prevalence of 1/1000. Population databases including ExAC have improved pathogenic variant prioritization in many diseases. Due to pseudogene homology of PKD1, the predominant ADPKD disease gene, and the variable disease severity and age of onset, we aimed to investigate the utility of ExAC for variant assessment in ADPKD. METHODS We assessed coverage and variant quality in the ExAC cohort and combined allele frequency and age data from the ExAC database (n = 60,706) with curated variants from 2000 ADPKD pedigrees (ADPKD Mutation Database). RESULTS Seventy-six percent of PKD1 and PKD2 were sequenced adequately for variant discovery and variant quality was high in ExAC. In ExAC, we identified 25 truncating and 393 previously reported disease-causing variants in PKD1 and PKD2, 6.9-fold higher than expected. Fifty-four different variants, previously classified as disease-causing, were observed in ≥5 participants in ExAC. CONCLUSION Our study demonstrates that many previously implicated disease-causing variants are too common, challenging their pathogenicity, or penetrance. The presence of protein-truncating variants in older participants in ExAC demonstrates the complexity of variant classification and highlights need for further study of prevalence and penetrance of this common monogenic disease.
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Abdelwahed M, Hilbert P, Ahmed A, Mahfoudh H, Bouomrani S, Dey M, Hachicha J, Kamoun H, Keskes-Ammar L, Belguith N. Mutational analysis in patients with Autosomal Dominant Polycystic Kidney Disease (ADPKD): Identification of five mutations in the PKD1 gene. Gene 2018; 671:28-35. [DOI: 10.1016/j.gene.2018.05.112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 05/24/2018] [Accepted: 05/30/2018] [Indexed: 01/01/2023]
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Su Q, Hu F, Ge X, Lei J, Yu S, Wang T, Zhou Q, Mei C, Shi Y. Structure of the human PKD1-PKD2 complex. Science 2018; 361:science.aat9819. [DOI: 10.1126/science.aat9819] [Citation(s) in RCA: 120] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 07/30/2018] [Indexed: 12/12/2022]
Abstract
Mutations in two genes, PKD1 and PKD2, account for most cases of autosomal dominant polycystic kidney disease, one of the most common monogenetic disorders. Here we report the 3.6-angstrom cryo–electron microscopy structure of truncated human PKD1-PKD2 complex assembled in a 1:3 ratio. PKD1 contains a voltage-gated ion channel (VGIC) fold that interacts with PKD2 to form the domain-swapped, yet noncanonical, transient receptor potential (TRP) channel architecture. The S6 helix in PKD1 is broken in the middle, with the extracellular half, S6a, resembling pore helix 1 in a typical TRP channel. Three positively charged, cavity-facing residues on S6b may block cation permeation. In addition to the VGIC, a five–transmembrane helix domain and a cytosolic PLAT domain were resolved in PKD1. The PKD1-PKD2 complex structure establishes a framework for dissecting the function and disease mechanisms of the PKD proteins.
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Xu D, Ma Y, Gu X, Bian R, Lu Y, Xing X, Mei C. Novel Mutations in the PKD1 and PKD2 Genes of Chinese Patients with Autosomal Dominant Polycystic Kidney Disease. Kidney Blood Press Res 2018. [DOI: 10.1159/000487899] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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17
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Song X, Haghighi A, Iliuta IA, Pei Y. Molecular diagnosis of autosomal dominant polycystic kidney disease. Expert Rev Mol Diagn 2017; 17:885-895. [PMID: 28724316 DOI: 10.1080/14737159.2017.1358088] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
INTRODUCTION Autosomal dominant polycystic kidney disease (ADPKD) is the most common inherited kidney disease that accounts for 5-10% of end-stage renal disease in developed countries. Mutations in PKD1 and PKD2 account for a majority of cases. Mutation screening of PKD1 is technically challenging largely due to the complexity resulting from duplication of its first 33 exons in six highly homologous pseudogenes (i.e. PKD1P1-P6). Protocol using locus-specific long-range and nested PCR has enabled comprehensive PKD1 mutation screening but is labor-intensive and costly. Here, the authors review how recent advances in Next Generation Sequencing are poised to transform and extend molecular diagnosis of ADPKD. Areas covered: Key original research articles and reviews of the topic published in English identified through PubMed from 1957-2017. Expert commentary: The authors review current and evolving approaches using targeted resequencing or whole genome sequencing for screening typical as well as challenging cases (e.g. cases with no detectable PKD1 and PKD2 mutations which may be due to somatic mosaicism or other cystic disease; and complex genetics such as bilineal disease).
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Affiliation(s)
- Xuewen Song
- a Division of Nephrology , University Health Network and University of Toronto , Toronto , ON , Canada
| | - Amirreza Haghighi
- a Division of Nephrology , University Health Network and University of Toronto , Toronto , ON , Canada
| | - Ioan-Andrei Iliuta
- a Division of Nephrology , University Health Network and University of Toronto , Toronto , ON , Canada
| | - York Pei
- a Division of Nephrology , University Health Network and University of Toronto , Toronto , ON , Canada
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System analysis of gene mutations and clinical phenotype in Chinese patients with autosomal-dominant polycystic kidney disease. Sci Rep 2016; 6:35945. [PMID: 27782177 PMCID: PMC5080601 DOI: 10.1038/srep35945] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 10/07/2016] [Indexed: 02/05/2023] Open
Abstract
Autosomal dominant polycystic kidney disease (ADPKD) is the most common inherited kidney disorder mainly caused by mutation in PKD1/PKD2. However, ethnic differences in mutations, the association between mutation genotype/clinical phenotype, and the clinical applicable value of mutation detection are poorly understood. We made systematically analysis of Chinese ADPKD patients based on a next-generation sequencing platform. Among 148 ADPKD patients enrolled, 108 mutations were detected in 127 patients (85.8%). Compared with mutations in Caucasian published previously, the PKD2 mutation detection rate was lower, and patients carrying the PKD2 mutation invariably carried the PKD1 mutation. The definite pathogenic mutation detection rate was lower, whereas the multiple mutations detection rate was higher in Chinese patients. Then, we correlated PKD1/PKD2 mutation data and clinical data: patients with mutation exhibited a more severe phenotype; patients with >1 mutations exhibited a more severe phenotype; patients with pathogenic mutations exhibited a more severe phenotype. Thus, the PKD1/PKD2 mutation status differed by ethnicity, and the PKD1/PKD2 genotype may affect the clinical phenotype of ADPKD. Furthermore, it makes sense to detect PKD1/PKD2 mutation status for early diagnosis and prognosis, perhaps as early as the embryo/zygote stage, to facilitate early clinical intervention and family planning.
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Ramanathan G, Ghosh S, Elumalai R, Periyasamy S, Lakkakula BVKS. Influence of angiotensin converting enzyme ( ACE) gene rs4362 polymorphism on the progression of kidney failure in patients with autosomal dominant polycystic kidney disease (ADPKD). Indian J Med Res 2016; 143:748-755. [PMID: 27748299 PMCID: PMC5094114 DOI: 10.4103/0971-5916.191992] [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] [Indexed: 11/28/2022] Open
Abstract
Background & objectives: Autosomal dominant polycystic kidney disease (ADPKD) is an inherited systemic disorder, characterized by the fluid filled cysts in the kidneys leading to end stage renal failure in later years of life. Hypertension is one of the major factors independently contributing to the chronic kidney disease (CKD) progression. The renin-angiotensin aldosterone system (RAAS) genes have been extensively studied as hypertension candidate genes. The aim of the present study was to investigate the role of angiotensin converting enzyme tagging - single nucleotide polymorphisms (ACE tag-SNPs) in progression of CKD in patients with ADPKD. Methods: In the present study six ACE tagSNPs (angiotensin converting enzyme tag single nucleotide polymorphisms) and insertion/deletion (I/D) in 102 ADPKD patients and 106 control subjects were investigated. The tagSNPs were genotyped using FRET-based KASPar method and ACE ID by polymerase chain reaction (PCR) and electrophoresis. Genotypes and haplotypes were compared between ADPKD patients and controls. Univariate and multivariate logistic regression analyses were performed to assess the effect of genotypes and hypertension on CKD advancement. Mantel-Haenszel (M-H) stratified analysis was performed to study the relationship between different CKD stages and hypertension and their interaction. Results: All loci were polymorphic and except rs4293 SNP the remaining loci followed Hardy-Weinberg equilibrium. Distribution of ACE genotypes and haplotypes in controls and ADPKD patients was not significant. A significant linkage disequilibrium (LD) was observed between SNPs forming two LD blocks. The univariate analysis revealed that the age, hypertension, family history of diabetes and ACE rs4362 contributed to the advancement of CKD. Interpretation & conclusions: The results suggest that the ACE genotypes are effect modifiers of the relationship between hypertension and CKD advancement among the ADPKD patients.
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Affiliation(s)
| | - Santu Ghosh
- Department of Environmental Health Engineering, Sri Ramachandra University, Chennai, India
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Hafizi A, Khatami SR, Galehdari H, Shariati G, Saberi AH, Hamid M. Exon sequencing of PKD1 gene in an Iranian patient with autosomal-dominant polycystic kidney disease. IRANIAN BIOMEDICAL JOURNAL 2015; 18:143-50. [PMID: 24842140 PMCID: PMC4048478 DOI: 10.6091/ibj.1317.2014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Introduction: Autosomal dominant polycystic kidney disease (ADPKD) is one of the most common genetic kidney disorders with the incidence of 1 in 1,000 births. ADPKD is genetically heterogeneous with two genes identified: PKD1 (16p13.3, 46 exons) and PKD2 (4q21, 15 exons). Eighty five percent of the patients with ADPKD have at least one mutation in the PKD1 gene. Genetic studies have demonstrated an important allelic variability among patients, but very few data are known about the genetic variation among Iranian populations. Methods: In this study, exon direct sequencing of PKD1 was performed in a seven-year old boy with ADPKD and in his parents. The patient’s father was ADPKD who was affected without any kidney dysfunction, and the patient’s mother was congenitally missing one kidney. Results: Molecular genetic testing found a mutation in all three members of this family. It was a missense mutation GTG>ATG at position 3057 in exon 25 of PKD1. On the other hand, two novel missense mutations were reported just in the 7-year-old boy: ACA>GCA found in exon 15 at codon 2241 and CAC>AAC found in exon 38 at codon 3710. For checking the pathogenicity of these mutations, exons 15, 25, and 38 of 50 unrelated normal cases were sequenced. Conclusion: our findings suggested that GTG>ATG is a polymorphism with high frequency (60%) as well as ACA>GCA and CAC>AAC are polymorphisms with frequencies of 14% and 22%, respectively in the population of Southwest Iran.
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Affiliation(s)
- Atousa Hafizi
- Dept. of Genetics, Faculty of Science, Shahid Chamran University, Ahvaz, Iran
| | - Saeid Reza Khatami
- Dept. of Genetics, Faculty of Science, Shahid Chamran University, Ahvaz, Iran
| | - Hamid Galehdari
- Dept. of Genetics, Faculty of Science, Shahid Chamran University, Ahvaz, Iran
| | - Gholamreza Shariati
- Narges Medical Genetic Laboratory, Ahvaz, Iran.,Dept. of Medical Genetics, Jundishapur University of Medical Science, Ahvaz, Iran
| | - Ali Hossein Saberi
- Narges Medical Genetic Laboratory, Ahvaz, Iran.,Dept. of Medical Genetics, Jundishapur University of Medical Science, Ahvaz, Iran
| | - Mohammad Hamid
- Research Center of Biotechnology, Pasteur Institute of Iran, Tehran, Iran
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Choi R, Park HC, Lee K, Lee MG, Kim JW, Ki CS, Hwang YH, Ahn C. Identification of novel PKD1 and PKD2 mutations in Korean patients with autosomal dominant polycystic kidney disease. BMC MEDICAL GENETICS 2014; 15:129. [PMID: 25491204 PMCID: PMC4411869 DOI: 10.1186/s12881-014-0129-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 11/20/2014] [Indexed: 01/23/2023]
Abstract
Background Autosomal dominant polycystic kidney disease (ADPKD) is the most common inherited kidney disorder. It is caused by mutations in the PKD1 and PKD2 genes, and manifests as progressive cyst growth and renal enlargement, resulting in renal failure. Although there have been a few studies on the frequency and spectrum of mutations in PKD1 and PKD2 in Korean patients with ADPKD, only exons 36–46, excluding the duplicated region, were analyzed, which makes it difficult to determine accurate mutation frequencies and mutation spectra. Methods We performed sequence analysis of 20 consecutive unrelated ADPKD patients using long-range polymerase chain reaction (PCR) to avoid pseudogene amplification, followed by exon-specific PCR and sequencing of the all exons of these two genes. Multiplex ligation-dependent probe amplification was performed in patients in whom pathogenic mutations in PKD1 or PKD2 were not identified by LR-PCR and direct sequencing to detect large genomic rearrangements. Results All patients met the diagnostic criteria of ADPKD, and pathogenic mutations were found in 18 patients (90.0%), comprising 15 mutations in PKD1 and three in PKD2. Among 10 novel mutations, eight mutations were found in the PKD1 gene while two mutations were found in the PKD2 gene. Eight of 14 PKD1 mutations (57.1%) were located in the duplicated region. Conclusions This study expands the spectra of mutations in the PKD1 and PKD2 genes and shows that the mutation frequencies of these genes in Korean ADPKD patients are similar to those reported in other ethnicities. Sequence analysis, including analysis of the duplicated region, is essential for molecular diagnosis of ADPKD.
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Affiliation(s)
- Rihwa Choi
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, (135-710) 81 Irwon-Ro Gangnam-gu, Seoul, South Korea.
| | - Hayne Cho Park
- Department of Internal Medicine, Seoul National University College of Medicine, (110-744) 28 Yeongeon-dong, Jongno-gu, Seoul, South Korea.
| | - Kyunghoon Lee
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, (135-710) 81 Irwon-Ro Gangnam-gu, Seoul, South Korea.
| | - Myoung-Gun Lee
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, (135-710) 81 Irwon-Ro Gangnam-gu, Seoul, South Korea.
| | - Jong-Won Kim
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, (135-710) 81 Irwon-Ro Gangnam-gu, Seoul, South Korea.
| | - Chang-Seok Ki
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, (135-710) 81 Irwon-Ro Gangnam-gu, Seoul, South Korea.
| | - Young-Hwan Hwang
- Department of Internal Medicine, Eulji General Hospital, (139-872), 1306 Dunsan 2(i)-dong, Seo-gu, Daejeon, Seoul, South Korea.
| | - Curie Ahn
- Department of Internal Medicine, Seoul National University College of Medicine, (110-744) 28 Yeongeon-dong, Jongno-gu, Seoul, South Korea.
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Wang Z, Wang Y, Xiong J. A new PKD1 mutation discovered in a Chinese family with autosomal polycystic kidney disease. Kidney Blood Press Res 2014; 39:1-8. [PMID: 24821069 DOI: 10.1159/000355772] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/28/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Autosomal-dominant polycystic kidney disease (ADPKD), a heterogeneous genetic disorder characterized by massive kidney enlargement and progressive chronic kidney disease, is due to abnormal proliferation of renal tubular epithelium. ADPKD is known to be caused by mutations in PKD1 and PKD2 genes. METHODS In the present study, the mutation analysis of PKD genes was performed in a new Chinese family with ADPKD using Long-Range (LR) PCR sequencing and targeted next-generation sequencing (targeted DNA-HiSeq). RESULTS A unique 28 bp deletion (c.12605_12632del28) in exon 46 of the PKD1 gene was identified in two affected family members by LR PCR method, but not in any unaffected relatives or unrelated controls. Higher accuracy and less missing detection presented in LR PCR method compared with targeted DNA-HiSeq. This mutation c.12605_12632del28 (p.Arg4202ProextX146) resulted in a delayed termination of amino acid code, and was highly speculated pathogenic in this ADPKD family. Moreover, this newly identified frame-shift change was compared to the PKD gene database, but no similar mutation was yet reported. CONCLUSION A novel frame-shift mutation, c. 12605_12632del28, in the PKD1 gene was found in a Chinese ADPKD family. All evidence available suggested that it might be the mutation responsible for the disease in that family.
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Affiliation(s)
- Zhendi Wang
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China
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Novel mutations of PKD genes in the Czech population with autosomal dominant polycystic kidney disease. BMC MEDICAL GENETICS 2014; 15:41. [PMID: 24694054 PMCID: PMC3992149 DOI: 10.1186/1471-2350-15-41] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 03/10/2014] [Indexed: 11/10/2022]
Abstract
BACKGROUND Autosomal dominant polycystic kidney disease (ADPKD) is the most common hereditary renal disorder caused by mutation in either one of two genes, PKD1 and PKD2. High structural and sequence complexity of PKD genes makes the mutational diagnostics of ADPKD challenging. The present study is the first detailed analysis of both PKD genes in a cohort of Czech patients with ADPKD using High Resolution Melting analysis (HRM) and Multiplex Ligation-dependent Probe Amplification (MLPA). METHODS The mutational analysis of PKD genes was performed in a set of 56 unrelated patients. For mutational screening of the PKD1 gene, the long-range PCR (LR-PCR) strategy followed by nested PCR was used. Resulting PCR fragments were analyzed by HRM; the positive cases were reanalyzed and confirmed by direct sequencing. Negative samples were further examined for sequence changes in the PKD2 gene by the method of HRM and for large rearrangements of both PKD1 and PKD2 genes by MLPA. RESULTS Screening of the PKD1 gene revealed 36 different likely pathogenic germline sequence changes in 37 unrelated families/individuals. Twenty-five of these sequence changes were described for the first time. Moreover, a novel large deletion was found within the PKD1 gene in one patient. Via the mutational analysis of the PKD2 gene, two additional likely pathogenic mutations were detected. CONCLUSIONS Probable pathogenic mutation was detected in 71% of screened patients. Determination of PKD mutations and their type and localization within corresponding genes could help to assess clinical prognosis of ADPKD patients and has major benefit for prenatal and/or presymptomatic or preimplantational diagnostics in affected families as well.
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Chang MY, Chen HM, Jenq CC, Lee SY, Chen YM, Tian YC, Chen YC, Hung CC, Fang JT, Yang CW, Wu-Chou YH. Novel PKD1 and PKD2 mutations in Taiwanese patients with autosomal dominant polycystic kidney disease. J Hum Genet 2013; 58:720-7. [PMID: 23985799 DOI: 10.1038/jhg.2013.91] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 07/19/2013] [Accepted: 08/02/2013] [Indexed: 11/09/2022]
Abstract
Autosomal dominant polycystic kidney disease (ADPKD) is a heterogeneous disease caused by mutations in PKD1 and PKD2. The genotype-phenotype correlations are not completely understood. We performed direct PCR-sequencing plus multiplex ligation-dependent probe amplification for PKD1 and PKD2 in 46 unrelated patients. Disease-causing mutations were identified in 30 (65%) patients: 23 (77%) patients have mutations in PKD1 and 7 (23%) have mutations in PKD2. Nonsense, splicing or frame-shifting mutations were found in 18 patients, exon duplication in 1 and missense mutations in 11 patients. Two likely PKD1 hypomorphic alleles (p.Arg2477His and p.Arg3439Trp) segregated with mild disease in a family. A total of 34 mutations were identified and 17 (50%) of which are novel. The median age at onset of dialysis was significantly earlier in patients with PKD1 mutations (52 years) than in patients with PKD2 mutations (65.5 years) and those with an undetermined genotype (67 years) by survival analysis (log-rank test, P=0.014). Patients carrying PKD1-truncating mutations have a trend toward earlier initiation of dialysis compared with carriers of non-truncating mutations (52 years vs 57 years, P=0.061). A family history of dialysis before 55 years was more common in PKD1 patients than in others (P<0.05). In conclusion, this study identified novel mutations in PKD1 and PKD2 and demonstrated the presence of PKD1 hypomorphic alleles in Taiwanese patients. Patients carrying PKD1 mutations, especially those with truncating mutations, could have a more rapidly progressive disease than others. These results might have implications for diagnosis and risk stratification in patients with ADPKD.
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Affiliation(s)
- Ming-Yang Chang
- Kidney Research Center and Department of Nephrology, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taoyuan, Taiwan
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Robinson C, Hiemstra TF, Spencer D, Waller S, Daboo L, Karet Frankl FE, Sandford RN. Clinical utility of PKD2 mutation testing in a polycystic kidney disease cohort attending a specialist nephrology out-patient clinic. BMC Nephrol 2012; 13:79. [PMID: 22863349 PMCID: PMC3502417 DOI: 10.1186/1471-2369-13-79] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 07/18/2012] [Indexed: 11/15/2022] Open
Abstract
Background ADPKD affects approximately 1:1000 of the worldwide population. It is caused by mutations in two genes, PKD1 and PKD2. Although allelic variation has some influence on disease severity, genic effects are strong, with PKD2 mutations predicting later onset of ESRF by up to 20 years. We therefore screened a cohort of ADPKD patients attending a nephrology out-patient clinic for PKD2 mutations, to identify factors that can be used to offer targeted gene testing and to provide patients with improved prognostic information. Methods 142 consecutive individuals presenting to a hospital nephrology out-patient service with a diagnosis of ADPKD and CKD stage 4 or less were screened for mutations in PKD2, following clinical evaluation and provision of a detailed family history (FH). Results PKD2 mutations were identified in one fifth of cases. 12% of non-PKD2 patients progressed to ESRF during this study whilst none with a PKD2 mutation did (median 38.5 months of follow-up, range 16–88 months, p < 0.03). A significant difference was found in age at ESRF of affected family members (non-PKD2 vs. PKD2, 54 yrs vs. 65 yrs; p < 0.0001). No PKD2 mutations were identified in patients with a FH of ESRF occurring before age 50 yrs, whereas a PKD2 mutation was predicted by a positive FH without ESRF. Conclusions PKD2 testing has a clinically significant detection rate in the pre-ESRF population. It did not accurately distinguish those individuals with milder renal disease defined by stage of CKD but did identify a group less likely to progress to ESRF. When used with detailed FH, it offers useful prognostic information for individuals and their families. It can therefore be offered to all but those whose relatives have developed ESRF before age 50.
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Affiliation(s)
- Caroline Robinson
- Academic Department of Medical Genetics, University of Cambridge School of Clinical Medicine, Cambridge, CB2 0SP, UK
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Audrézet MP, Cornec-Le Gall E, Chen JM, Redon S, Quéré I, Creff J, Bénech C, Maestri S, Le Meur Y, Férec C. Autosomal dominant polycystic kidney disease: comprehensive mutation analysis of PKD1 and PKD2 in 700 unrelated patients. Hum Mutat 2012; 33:1239-50. [PMID: 22508176 DOI: 10.1002/humu.22103] [Citation(s) in RCA: 126] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Accepted: 04/02/2012] [Indexed: 11/06/2022]
Abstract
Autosomal dominant polycystic kidney disease (ADPKD), the most common inherited kidney disorder, is caused by mutations in PKD1 or PKD2. The molecular diagnosis of ADPKD is complicated by extensive allelic heterogeneity and particularly by the presence of six highly homologous sequences of PKD1 exons 1-33. Here, we screened PKD1 and PKD2 for both conventional mutations and gross genomic rearrangements in up to 700 unrelated ADPKD patients--the largest patient cohort to date--by means of direct sequencing, followed by quantitative fluorescent multiplex polymerase chain reaction or array-comparative genomic hybridization. This resulted in the identification of the largest number of new pathogenic mutations (n = 351) in a single publication, expanded the spectrum of known ADPKD pathogenic mutations by 41.8% for PKD1 and by 23.8% for PKD2, and provided new insights into several issues, such as the population-dependent distribution of recurrent mutations compared with founder mutations and the relative paucity of pathogenic missense mutations in the PKD2 gene. Our study, together with others, highlights the importance of developing novel approaches for both mutation detection and functional validation of nondefinite pathogenic mutations to increase the diagnostic value of molecular testing for ADPKD.
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Rossetti S, Hopp K, Sikkink RA, Sundsbak JL, Lee YK, Kubly V, Eckloff BW, Ward CJ, Winearls CG, Torres VE, Harris PC. Identification of gene mutations in autosomal dominant polycystic kidney disease through targeted resequencing. J Am Soc Nephrol 2012; 23:915-33. [PMID: 22383692 DOI: 10.1681/asn.2011101032] [Citation(s) in RCA: 132] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Mutations in two large multi-exon genes, PKD1 and PKD2, cause autosomal dominant polycystic kidney disease (ADPKD). The duplication of PKD1 exons 1-32 as six pseudogenes on chromosome 16, the high level of allelic heterogeneity, and the cost of Sanger sequencing complicate mutation analysis, which can aid diagnostics of ADPKD. We developed and validated a strategy to analyze both the PKD1 and PKD2 genes using next-generation sequencing by pooling long-range PCR amplicons and multiplexing bar-coded libraries. We used this approach to characterize a cohort of 230 patients with ADPKD. This process detected definitely and likely pathogenic variants in 115 (63%) of 183 patients with typical ADPKD. In addition, we identified atypical mutations, a gene conversion, and one missed mutation resulting from allele dropout, and we characterized the pattern of deep intronic variation for both genes. In summary, this strategy involving next-generation sequencing is a model for future genetic characterization of large ADPKD populations.
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Affiliation(s)
- Sandro Rossetti
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN 55905, USA.
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Bataille S, Berland Y, Fontes M, Burtey S. High Resolution Melt analysis for mutation screening in PKD1 and PKD2. BMC Nephrol 2011; 12:57. [PMID: 22008521 PMCID: PMC3206831 DOI: 10.1186/1471-2369-12-57] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2011] [Accepted: 10/18/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Autosomal dominant polycystic kidney disease (ADPKD) is the most common hereditary kidney disorder. It is characterized by focal development and progressive enlargement of renal cysts leading to end-stage renal disease. PKD1 and PKD2 have been implicated in ADPKD pathogenesis but genetic features and the size of PKD1 make genetic diagnosis tedious. METHODS We aim to prove that high resolution melt analysis (HRM), a recent technique in molecular biology, can facilitate molecular diagnosis of ADPKD. We screened for mutations in PKD1 and PKD2 with HRM in 37 unrelated patients with ADPKD. RESULTS We identified 440 sequence variants in the 37 patients. One hundred and thirty eight were different. We found 28 pathogenic mutations (25 in PKD1 and 3 in PKD2 ) within 28 different patients, which is a diagnosis rate of 75% consistent with literature mean direct sequencing diagnosis rate. We describe 52 new sequence variants in PKD1 and two in PKD2. CONCLUSION HRM analysis is a sensitive and specific method for molecular diagnosis of ADPKD. HRM analysis is also costless and time sparing. Thus, this method is efficient and might be used for mutation pre-screening in ADPKD genes.
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Affiliation(s)
- Stanislas Bataille
- EA 4263 Thérapie des Maladies Génétiques, Faculté de Médecine, Université de la Méditerranée, Boulevard Jean Moulin 13005 Marseille, France
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Kumar S, Dudley JT, Filipski A, Liu L. Phylomedicine: an evolutionary telescope to explore and diagnose the universe of disease mutations. Trends Genet 2011; 27:377-86. [PMID: 21764165 PMCID: PMC3272884 DOI: 10.1016/j.tig.2011.06.004] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 06/10/2011] [Accepted: 06/13/2011] [Indexed: 12/30/2022]
Abstract
Modern technologies have made the sequencing of personal genomes routine. They have revealed thousands of nonsynonymous (amino acid altering) single nucleotide variants (nSNVs) of protein-coding DNA per genome. What do these variants foretell about an individual's predisposition to diseases? The experimental technologies required to carry out such evaluations at a genomic scale are not yet available. Fortunately, the process of natural selection has lent us an almost infinite set of tests in nature. During long-term evolution, new mutations and existing variations have been evaluated for their biological consequences in countless species, and outcomes are readily revealed by multispecies genome comparisons. We review studies that have investigated evolutionary characteristics and in silico functional diagnoses of nSNVs found in thousands of disease-associated genes. We conclude that the patterns of long-term evolutionary conservation and permissible sequence divergence are essential and instructive modalities for functional assessment of human genetic variations.
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Affiliation(s)
- Sudhir Kumar
- School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, USA.
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