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Naguib S, Mansour LA, Soliman NA, El-Hanafy HM, Fahmy YA, Elmonem MA, Halim RMA. Expanding the Genetic Spectrum of AGXT Gene Variants in Egyptian Patients with Primary Hyperoxaluria Type I. Genet Test Mol Biomarkers 2024; 28:151-158. [PMID: 38657121 DOI: 10.1089/gtmb.2023.0525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024] Open
Abstract
Introduction: Approximately 80% of primary hyperoxaluria cases are caused by primary hyperoxaluria type 1 (PH1, OMIM# 259900), which is characterized by pathogenic variants in the AGXT gene, resulting in deficiency of the liver-specific enzyme alanine-glyoxylate aminotransferase (AGT). This leads to increased production of oxalate, which cannot be effectively eliminated from the body, resulting in its accumulation primarily in the kidneys and other organs. Subjects and Methods: This study included 17 PH1 Egyptian patients from 12 unrelated families, recruited from the Inherited Kidney Disease Outpatient Clinic and the Dialysis Units, Cairo University Hospitals, during the period from January 2018 to December 2019, aiming to identify the pathogenic variants in the AGXT gene. Results: Six different variants were detected. These included three frameshift and three missense variants, all found in homozygosity within the respective families. The most common variant was c.121G>A;p.(Gly41Arg) detected in four families, followed by c.725dup;p.(Asp243GlyfsTer12) in three families, c.33dup;p.(Lys12Glnfs156) in two families, and c.731T >C;p.(Ile244Thr), c.33delC;p.(Lys12Argfs34), and c.568G>A;p.(Gly190Arg) detected in one family each. Conclusion: Consanguineous Egyptian families with history of renal stones or renal disease suspicious of primary hyperoxaluria should undergo AGXT genetic sequencing, specifically targeting exons 1 and 7, as variants in these two exons account for >75% of disease-causing variants in Egyptian patients with confirmed PH1.
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Affiliation(s)
- Somayya Naguib
- Department of Clinical and Chemical Pathology, Kasr Alainy Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Lamiaa A Mansour
- Department of Clinical and Chemical Pathology, Kasr Alainy Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Neveen A Soliman
- Department of Pediatrics, Center of Pediatric Nephrology and Transplantation (CPNT), Kasr Alainy Faculty of Medicine, Cairo University, Cairo, Egypt
- Egyptian Group for Orphan Renal Disease (EGORD), Cairo, Egypt
- Department of Clinical Genetics, Egypt Center for Research and Regenerative Medicine (ECRRM), Kasr Alainy Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Hadeel M El-Hanafy
- Department of Clinical and Chemical Pathology, Kasr Alainy Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Yosra A Fahmy
- Department of Pediatrics, Center of Pediatric Nephrology and Transplantation (CPNT), Kasr Alainy Faculty of Medicine, Cairo University, Cairo, Egypt
- Egyptian Group for Orphan Renal Disease (EGORD), Cairo, Egypt
| | - Mohamed A Elmonem
- Department of Clinical and Chemical Pathology, Kasr Alainy Faculty of Medicine, Cairo University, Cairo, Egypt
- Department of Clinical Genetics, Egypt Center for Research and Regenerative Medicine (ECRRM), Kasr Alainy Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Radwa M Abdel Halim
- Department of Clinical and Chemical Pathology, Kasr Alainy Faculty of Medicine, Cairo University, Cairo, Egypt
- Department of Clinical and Chemical Pathology, Faculty of Medicine, New Giza University, Giza, Egypt
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Xin Q, Dong Y, Guo W, Zhao X, Liu Z, Shi X, Lang Y, Shao L. Four novel variants identified in primary hyperoxaluria and genotypic and phenotypic analysis in 21 Chinese patients. Front Genet 2023; 14:1124745. [PMID: 37139236 PMCID: PMC10150119 DOI: 10.3389/fgene.2023.1124745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 04/04/2023] [Indexed: 05/05/2023] Open
Abstract
Background: Primary hyperoxaluria (PH) is a rare genetic disorder characterized by excessive accumulation of oxalate in plasma and urine, resulting in various phenotypes due to allelic and clinical heterogeneity. This study aimed to analyze the genotype of 21 Chinese patients with primary hyperoxaluria (PH) and explore their correlations between genotype and phenotype. Methods: Combined with clinical phenotypic and genetic analysis, we identified 21 PH patients from highly suspected Chinese patients. The clinical, biochemical, and genetic data of the 21 patients were subsequently reviewed. Results: We reported 21 cases of PH in China, including 12 cases of PH1, 3 cases of PH2 and 6 cases of PH3, and identified 2 novel variants (c.632T > G and c.823_824del) in AGXT gene and 2 novel variants (c.258_272del and c.866-34_866-8del) in GRHPR gene, respectively. A possible PH3 hotspot variant c.769T > G was identified for the first time. In addition, patients with PH1 showed higher levels of creatinine and lower eGFR than those with PH2 and PH3. In PH1, patients with severe variants in both alleles had significantly higher creatinine and lower eGFR than other patients. Delayed diagnosis still existed in some late-onset patients. Of all cases, 6 had reached to end-stage kidney disease (ESKD) at diagnosis with systemic oxalosis. Five patients were on dialysis and three had undergone kidney or liver transplants. Notably, four patients showed a favorable therapeutic response to vitamin B6, and c.823_824dup and c.145A > C may be identified as potentially vitamin B6-sensitive genotypes. Conclusion: In brief, our study identified 4 novel variants and extended the variant spectrum of PH in the Chinese population. The clinical phenotype was characterized by large heterogeneity, which may be determined by genotype and a variety of other factors. We first reported two variants that may be sensitive to vitamin B6 therapy in Chinese population, providing valuable references for clinical treatment. In addition, early screening and prognosis of PH should be given more attention. We propose to establish a large-scale registration system for rare genetic diseases in China and call for more attention on rare kidney genetic diseases.
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Affiliation(s)
- Qing Xin
- Department of Nephrology, Qingdao Municipal Hospital, Qingdao, China
| | - Yameng Dong
- Department of Nephrology, Qingdao Municipal Hospital, Qingdao, China
| | - Wencong Guo
- Department of Nephrology, Qingdao Municipal Hospital, Qingdao, China
| | - Xiangzhong Zhao
- Medical Research Center, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Zhiying Liu
- Renal Division, Peking University First Hospital, Beijing, China
| | - Xiaomeng Shi
- Department of Nephrology, Qingdao Municipal Hospital, Qingdao, China
| | - Yanhua Lang
- Department of Nursing, Qingdao Municipal Hospital, Qingdao, China
- *Correspondence: Yanhua Lang, ; Leping Shao,
| | - Leping Shao
- Department of Nephrology, Qingdao Municipal Hospital, Qingdao, China
- *Correspondence: Yanhua Lang, ; Leping Shao,
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3
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Ahmed HA, Fadel FI, Abdel Mawla MA, Salah DM, Fathallah MG, Amr K. Next-generation sequencing in identification of pathogenic variants in primary hyperoxaluria among 21 Egyptian families: Identification of two novel AGXT gene mutations. Mol Genet Genomic Med 2022; 10:e1992. [PMID: 35661454 PMCID: PMC9356549 DOI: 10.1002/mgg3.1992] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 04/19/2022] [Accepted: 05/13/2022] [Indexed: 11/23/2022] Open
Abstract
Background Primary hyperoxaluria (PH) is a rare heterogeneous, autosomal recessive disorder of glyoxylate metabolism. It is characterized by excessive hepatic production of oxalate resulting in a wide spectrum of clinical, imaging, and functional presentation. The characteristic features of PH comprise of recurrent urolithiasis, renal stones, and/or nephrocalcinosis. Three known types of PH have been identified PH1, PH2, and PH3. Pathogenic variants in AGXT, GRHPR, and HOGA1 cause the phenotypic expression of PH. Methods In this study, we describe the clinical and genetic findings of 22 patients from 21 unrelated Egyptian families with the distinctive clinical features of PH. A thorough clinical evaluation followed by an NGS custom panel of AGXT, GRHPR, and HOGA1 genes was done. Results Two novel mutations (p.Gly27Glu and p.Gln256Serfs*17) and six previously reported mutations (p.Lys12Glnfs*156, p.Lys12Argfs*34, p.Ile244Thr, p.Asn22Ser, p.Pro11Leu, and p.Ile340Met) were identified in AGXT gene. The NGS panel results were validated thereafter using Sanger sequencing. Conclusion Our results extend the number of AGXT mutations identified so far and emphasize the important role of genetic testing in providing proper counseling and patients management.
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Affiliation(s)
- Hoda A Ahmed
- Medical Molecular Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Fatina I Fadel
- Pediatrics Department, Faculty of Medicine, Cairo University, Giza, Egypt
| | | | - Doaa M Salah
- Pediatrics Department, Faculty of Medicine, Cairo University, Giza, Egypt
| | | | - Khalda Amr
- Medical Molecular Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
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4
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Mandrile G, Pelle A, Sciannameo V, Benetti E, D'Alessandro MM, Emma F, Montini G, Peruzzi L, Petrarulo M, Romagnoli R, Vitale C, Cellini B, Giachino D. Primary hyperoxaluria in Italy: the past 30 years and the near future of a (not so) rare disease. J Nephrol 2022; 35:841-850. [PMID: 35218550 PMCID: PMC8995259 DOI: 10.1007/s40620-022-01258-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 01/12/2022] [Indexed: 11/29/2022]
Abstract
Background Primary hyperoxalurias (PHs) are rare autosomal recessive diseases of the glyoxylate metabolism; PH1 is caused by mutations in the AGXT gene, PH2 in GRHPR and PH3 in HOGA1. Methods Here we report the first large multi-center cohort of Italian PH patients collected over 30 years (1992–2020 median follow-up time 8.5 years). Complete genotype was available for 94/95 PH1 patients and for all PH2 (n = 3) and PH3 (n = 5) patients. Symptoms at onset were mainly nephrolithiasis (46.3%) and nephrocalcinosis (33.7%). Median age at onset of symptoms and diagnosis were 4.0 years and 9.9 years, respectively. Results Fifty-four patients (56.8%) were diagnosed after chronic kidney disease. Sixty-three patients (66.3%) developed end stage kidney disease (median age 14.0 years). Twenty-one patients had a kidney-only transplant and, among them, seven had a second kidney transplant combined with liver transplant. A combined kidney–liver transplant was carried out in 29 patients and a sequential kidney–liver transplant was performed in two. In five cases a preemptive liver transplant was performed. Those receiving a liver-only transplant tended to have lower kidney function at last follow-up. Conclusion Our study of PHs in Italy underlines a considerable diagnostic delay, which has only slightly decreased in recent years. Therefore, we suggest a more extensive use of both metabolic screening among patients with recurrent kidney stones and genotyping, including unambiguous assignment of minor/major allele status in order to promptly begin appropriate treatment. This will be fundamental in order to have access to the new therapies, which are mainly focused on substrate reduction for the oxalate-producing enzymes using RNA-interference. Graphical abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1007/s40620-022-01258-4.
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Affiliation(s)
- Giorgia Mandrile
- Genetic Unit and Thalassemia Center, San Luigi Gonzaga University Hospital, Regione Gonzole 10, 10043, Orbassano, TO, Italy.
| | - Alessandra Pelle
- Medical Genetics Unit, AOU Città della Salute e della Scienza, Turin, Italy
| | - Veronica Sciannameo
- Unit of Biostatistics, Epidemiology and Public Health, Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padova, Padua, Italy
| | - Elisa Benetti
- Pediatric Nephrology, Dialysis and Transplant Unit, Department of Women's and Children's Health, Padua University Hospital, Padua, Italy
| | - Maria Michela D'Alessandro
- Pediatric Nephrology Unit, Ospedale dei Bambini, A.R.N.A.S. Civico-G. Di Cristina, Benfratelli Palermo, PA, Italy
| | - Francesco Emma
- Division of Nephrology, Department of Pediatric Subspecialties, Bambino Gesù Children's Hospital-IRCCS, Rome, Italy
| | - Giovanni Montini
- Pediatric Nephrology, Dialysis and Transplant Unit, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milano, Italy.,Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Licia Peruzzi
- Pediatric Nephrology Unit, "Regina Margherita Department of Children's Diseases", Città della Salute e della Scienza di Torino, Turin, Italy
| | - Michele Petrarulo
- Kidney Stone Laboratory-Chemical-Clinical Laboratory Unit, Azienda Ospedaliera Ordine Mauriziano di Torino, Turin, Italy
| | - Renato Romagnoli
- Liver Transplant Unit, General Surgery 2U, Azienda Ospedaliera Universitaria Città della Salute e della Scienza di Torino, University of Turin, Turin, Italy
| | - Corrado Vitale
- Nephrology and Dialysis Unit, Azienda Ospedaliera Ordine Mauriziano di Torino, Turin, Italy
| | - Barbara Cellini
- Department of Medicine and Surgery, University of Perugia, Perugia, Italy
| | - Daniela Giachino
- Medical Genetic Unit, San Luigi Gonzaga University Hospital, Orbassano, TO, Italy.,Medical Genetics, Department Clinical and Biological Sciences, University of Torino, Turin, Italy
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5
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Cogal AG, Arroyo J, Shah RJ, Reese KJ, Walton BN, Reynolds LM, Kennedy GN, Seide BM, Senum SR, Baum M, Erickson SB, Jagadeesh S, Soliman NA, Goldfarb DS, Beara-Lasic L, Edvardsson VO, Palsson R, Milliner DS, Sas DJ, Lieske JC, Harris PC. Comprehensive Genetic Analysis Reveals Complexity of Monogenic Urinary Stone Disease. Kidney Int Rep 2021; 6:2862-2884. [PMID: 34805638 PMCID: PMC8589729 DOI: 10.1016/j.ekir.2021.08.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 08/24/2021] [Accepted: 08/30/2021] [Indexed: 01/06/2023] Open
Abstract
Introduction Because of phenotypic overlap between monogenic urinary stone diseases (USD), gene-specific analyses can result in missed diagnoses. We used targeted next generation sequencing (tNGS), including known and candidate monogenic USD genes, to analyze suspected primary hyperoxaluria (PH) or Dent disease (DD) patients genetically unresolved (negative; N) after Sanger analysis of the known genes. Cohorts consisted of 285 PH (PHN) and 59 DD (DDN) families. Methods Variants were assessed using disease-specific and population databases plus variant assessment tools and categorized using the American College of Medical Genetics (ACMG) guidelines. Prior Sanger analysis identified 47 novel PH or DD gene pathogenic variants. Results Screening by tNGS revealed pathogenic variants in 14 known monogenic USD genes, accounting for 45 families (13.1%), 27 biallelic and 18 monoallelic, including 1 family with a copy number variant (CNV). Recurrent genes included the following: SLC34A3 (n = 13), CLDN16 (n = 8), CYP24A1 (n = 4), SLC34A1 (n = 3), SLC4A1 (n = 3), APRT (n = 2), CLDN19 (n = 2), HNF4A1 (n = 2), and KCNJ1 (n = 2), whereas ATP6V1B1, CASR, and SLC12A1 and missed CNVs in the PH genes AGXT and GRHPR accounted for 1 pedigree each. Of the 48 defined pathogenic variants, 27.1% were truncating and 39.6% were novel. Most patients were diagnosed before 18 years of age (76.1%), and 70.3% of biallelic patients were homozygous, mainly from consanguineous families. Conclusion Overall, in patients suspected of DD or PH, 23.9% and 7.3% of cases, respectively, were caused by pathogenic variants in other genes. This study shows the value of a tNGS screening approach to increase the diagnosis of monogenic USD, which can optimize therapies and facilitate enrollment in clinical trials.
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Affiliation(s)
- Andrea G Cogal
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA
| | - Jennifer Arroyo
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA
| | - Ronak Jagdeep Shah
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA
| | - Kalina J Reese
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Brenna N Walton
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Laura M Reynolds
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Gabrielle N Kennedy
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Barbara M Seide
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA
| | - Sarah R Senum
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA
| | | | - Stephen B Erickson
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA
| | | | - Neveen A Soliman
- Department of Pediatrics, Center of Pediatric Nephrology and Transplantation, Kasr Al Ainy School of Medicine, Cairo University, Cairo, Egypt
| | - David S Goldfarb
- Nephrology Division, New York University Langone Health and New York University School of Medicine, New York, New York, USA
| | - Lada Beara-Lasic
- Nephrology Division, New York University Langone Health and New York University School of Medicine, New York, New York, USA
| | - Vidar O Edvardsson
- Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland.,Children's Medical Center, Landspitali-The National University Hospital of Iceland, Reykjavik, Iceland
| | - Runolfur Palsson
- Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland.,Division of Nephrology, Landspitali-The National University Hospital of Iceland, Reykjavik, Iceland
| | - Dawn S Milliner
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA
| | - David J Sas
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA.,Division of Pediatric Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - John C Lieske
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Peter C Harris
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, USA.,Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
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6
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Murad H, Alhalabi MB, Dabboul A, Alfakseh N, Nweder MS, Zghib Y, Wannous H. Molecular analysis of the AGXT gene in Syrian patients suspected with primary hyperoxaluria type 1. BMC Med Genomics 2021; 14:146. [PMID: 34082749 PMCID: PMC8176596 DOI: 10.1186/s12920-021-00996-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 05/27/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Characterization of the molecular basis of primary hyperoxaluria type 1 (PH-1) in Syria has been accomplished through the analysis of 90 unrelated chromosomes from 45 Syrians patients with PH-1 from different regions. METHODS Alanine glyoxylate aminotransferase (AGXT) gene mutations have been analyzed by using molecular detection methods based on the direct DNA sequencing for all exons of the AGXT gene. RESULTS Seventeen pathogenic mutations were detected in our patients. Six mutations were novels. The three most frequent mutations were c.33_34insC (p.Lys12fs) in Exon 1, c.584 T < G; p.Met195Arg in exon 5 and c.1007 T > A (p.Val336Asp) in exon 10, with a frequency of 33.3%, 12.2%, and 11.1%, respectively. CONCLUSION DNA sequencing used in this study can offer a useful method to investigate the mutations in Syrian PH-1 patients, and could offer an accurate tool for prenatal diagnosis and genetic counseling.
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Affiliation(s)
- Hossam Murad
- Human Genetics Division, Molecular Biology and Biotechnology Department, Human Genetics Division, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria.
| | - Mohamad Baseel Alhalabi
- Human Genetics Division, Molecular Biology and Biotechnology Department, Human Genetics Division, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria
| | - Amir Dabboul
- Human Genetics Division, Molecular Biology and Biotechnology Department, Human Genetics Division, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria
| | - Nour Alfakseh
- Human Genetics Division, Molecular Biology and Biotechnology Department, Human Genetics Division, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria
| | - Mohamad Sayah Nweder
- Human Genetics Division, Molecular Biology and Biotechnology Department, Human Genetics Division, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria
| | | | - Hala Wannous
- Chlidien's Hospital of Damascus, Damascus, Syria
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7
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Lin JA, Liao X, Wu W, Xiao L, Liu L, Qiu J. Clinical analysis of 13 children with primary hyperoxaluria type 1. Urolithiasis 2021; 49:425-431. [PMID: 33721035 PMCID: PMC8416882 DOI: 10.1007/s00240-021-01249-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 01/27/2021] [Indexed: 12/01/2022]
Abstract
A retrospective statistical analysis of primary hyperoxaluria type 1 (PH1) in children from June 2016 to May 2019 was carried out to discover its clinical and molecular biological characteristics. Patients were divided into two groups (infant and noninfant) according to clinic type. There were 13 pediatric patients (male:female = 6:7) with PH1 in the cohort from 11 families (four of which were biological siblings from two families), whose median age of symptom onset was 12 months and median confirmed diagnosis age was 14 months. Infant type (6 patients) was the most common type. The infant type mortality rate (100%) was higher than the noninfant (14.3%) (p = 0.029). The incidence of renal failure in infant patients was 67%, while the noninfant was 14.3%. 8 of 10 patients with nephrocalcinosis (NC) (76.92%, 10/13) were diagnosed by radiological imaging examinations, including X-ray (3 patients), CT (4 patients) and MRI (1 patient). NC was an independent risk factor for renal insufficiency [OR 3.33, 95% CI (0.7-1.2)], p < 0.05). Nine types of AGXT gene mutations were found; 1 type, c.190A > T, were first reported here. The most common AGXT gene mutation was c.679_680del, which occurred in exon 6 (5 patients). The infant type is the most common type of pediatric PH, with a relatively higher ratio of renal failure at symptom onset and poor prognosis. NC is an independent risk factor leading to renal failure, and radiological imaging examination is recommended for patients with abnormal ultrasound examination to identify NC. AGXT gene detection is important for the diagnosis and treatment of PH1 in children.
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Affiliation(s)
- Jin-Ai Lin
- Department of Nephrology, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Xin Liao
- Department of Nephrology, Guangzhou Women and Children's Medical Center, Guangzhou, China.
| | - Wenlin Wu
- Department of Nephrology, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Lixia Xiao
- Department of Nephrology, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Longshan Liu
- Department of Organ Transplantation, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China.
| | - Jiang Qiu
- Department of Organ Transplantation, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China.
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8
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Zhao F, Li J, Tang L, Li C, Wang W, Ning C. Characteristics of the genotype and phenotype in Chinese primary hyperoxaluria type 1 populations. Urolithiasis 2020; 49:17-25. [PMID: 32556641 DOI: 10.1007/s00240-020-01201-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 05/29/2020] [Indexed: 11/30/2022]
Abstract
The aim of our study is to explore the relationship between genotype and phenotype in Chinese PH1 patients and determine the putative mutation hotspot regions. This was a retrospective study regarding 13 Chinese PH1 patients. And all sporadic published researches of Chinese PH1 populations were searched and enrolled based on the inclusive standard. All patients presented with multiple urolithiasis or nephrolithiasis. Urinary oxalate values demonstrated an obvious and extensive variability, ranging from 1.01 to 3.85 mmol/1.73 m2. Molecular diagnosis showed that 13 mutant types were detected. Infantile form patient (pt.) 10 and five patients (pts. 5, 7, 8, 9, 12) carrying c.815_816insGA or c.33_34insC demonstrated a worse prognosis, of whom pt. 5 progressed into ESRD 4 years later and died of chronic kidney failure. Based on the integrated Chinese mutation data, two variants (c.815_816insGA and c.33_34insC) were determined as the most common mutations. Besides, c.1049G>A was initially identified in a Chinese patient. Conclusions: heterogeneity between genotype and phenotype was observed and described in Chinese PH1 patients. c.815_816insGA and c.33_34insC which were recognized as AGXT mutation hotspot regions in China implied a poor prognosis. And c.1049G>A was not determined as the race-specific mutation of Pakistani.
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Affiliation(s)
- Fangzhou Zhao
- Department of Urology, Capital Medical University Affiliated Beijing Friendship Hospital, Beijing, 100050, China
| | - Jun Li
- Department of Urology, Capital Medical University Affiliated Beijing Friendship Hospital, Beijing, 100050, China.
| | - Lei Tang
- Department of Urology, Capital Medical University Affiliated Beijing Friendship Hospital, Beijing, 100050, China
| | - Chunming Li
- Department of Urology, Capital Medical University Affiliated Beijing Friendship Hospital, Beijing, 100050, China
| | - Wenying Wang
- Department of Urology, Capital Medical University Affiliated Beijing Friendship Hospital, Beijing, 100050, China
| | - Chen Ning
- Department of Urology, Capital Medical University Affiliated Beijing Friendship Hospital, Beijing, 100050, China
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9
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Du DF, Li QQ, Chen C, Shi SM, Zhao YY, Jiang JP, Wang DW, Guo H, Zhang WJ, Chen ZS. Updated Genetic Testing of Primary Hyperoxaluria Type 1 in a Chinese Population: Results from a Single Center Study and a Systematic Review. Curr Med Sci 2018; 38:749-757. [PMID: 30341509 DOI: 10.1007/s11596-018-1941-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 09/06/2018] [Indexed: 11/27/2022]
Abstract
Primary hyperoxaluria type 1 (PH1) is a rare but devastating autosomal recessive inherited disease caused by mutations in gene AGXT. Pathogenic mutations of AGXT were mostly reported in Caucasian but infrequently in Asian, especially in Chinese. To update the genotypes of PH1 in the Chinese population, we collected and identified 7 Chinese probands with PH1 from 2013 to 2017 in our center, five of whom had delayed diagnosis and failed in kidney transplantation. Samples of peripheral blood DNA from the 7 patients and their family members were collected and sequencing analysis was performed to test the mutations of gene AGXT. Western blotting and enzyme activity analysis were conducted to evaluate the function of the mutations. Furthermore, a systematic review from 1998 to 2017 was performed to observe the genetic characteristics between Chinese and Caucasian. The results showed that a total of 12 mutations were identified in the 7 pedigrees. To the best of our knowledge, 2 novel variants of AGXT, p.Gly41Trp and p.Leu33Met, were first reported. Bioinformatics and functional analysis showed that only 7 mutations led to a reduced expression of alanine-glyoxylate amino transferase (AGT) at a protein level. The systematic review revealed significant population heterogeneity in PH1. In conclusion, new genetic subtypes and genetic characteristics of PH1 are updated in the Chinese population. Furthermore, a genotype-phenotype correlation is found in PH1.
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Affiliation(s)
- Dun-Feng Du
- Institute of Organ Transplantation, Huazhong University of Science and Technology, Wuhan, 430030, China
- Key Laboratory of Organ Transplantation, Ministry of Health/Education, Wuhan, 430030, China
| | - Qian-Qian Li
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Chen Chen
- Institute of Hypertension, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Shu-Mei Shi
- Key Laboratory of Molecular Biophysics of the Ministry of Education, Cardio-X Center, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Yuan-Yuan Zhao
- Institute of Organ Transplantation, Huazhong University of Science and Technology, Wuhan, 430030, China
- Key Laboratory of Organ Transplantation, Ministry of Health/Education, Wuhan, 430030, China
| | - Ji-Pin Jiang
- Institute of Organ Transplantation, Huazhong University of Science and Technology, Wuhan, 430030, China
- Key Laboratory of Organ Transplantation, Ministry of Health/Education, Wuhan, 430030, China
| | - Dao-Wen Wang
- Institute of Hypertension, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Hui Guo
- Institute of Organ Transplantation, Huazhong University of Science and Technology, Wuhan, 430030, China
- Key Laboratory of Organ Transplantation, Ministry of Health/Education, Wuhan, 430030, China
| | - Wei-Jie Zhang
- Institute of Organ Transplantation, Huazhong University of Science and Technology, Wuhan, 430030, China.
- Key Laboratory of Organ Transplantation, Ministry of Health/Education, Wuhan, 430030, China.
| | - Zhi-Shui Chen
- Institute of Organ Transplantation, Huazhong University of Science and Technology, Wuhan, 430030, China.
- Key Laboratory of Organ Transplantation, Ministry of Health/Education, Wuhan, 430030, China.
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Kanoun H, Jarraya F, Maalej B, Lahiani A, Mahfoudh H, Makni F, Hachicha J, Fakhfakh F. Identification of compound heterozygous patients with primary hyperoxaluria type 1: clinical evaluations and in silico investigations. BMC Nephrol 2017; 18:303. [PMID: 28969594 PMCID: PMC5625645 DOI: 10.1186/s12882-017-0719-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 09/20/2017] [Indexed: 01/04/2023] Open
Abstract
Background Primary hyperoxaluria type 1 (PH1) is an autosomal recessive inherited disorder of glyoxylate metabolism in which excessive oxalates are formed by the liver and excreted by the kidneys. Calcium oxalate crystallizes in the urine, leading to urolithiasis, nephrocalcinosis, and consequent renal failure if treatment is not initiated promptly. Mutations in the AGXT gene which encodes the hepatic peroxisomal enzyme alanine:glyoxylate aminotransferase are responsible of PH1. In the present work, we aimed to analyze AGXT gene and in silico investigations performed in four patients with PH1 among two non consanguineous families. Methods Exhaustive gene sequencing was performed after PCR amplification of coding exons and introns boundaries. Bioinformatic tools were used to predict the impact of AGXT variants on gene expression as well as on the protein structure and function. Results Direct sequencing of all exons of AGXT gene revealed the emergence of multiple mutations in compound heterozygous state in the two studied families. Two patients were compound heterozygous for the c.731 T > C, c.32C > T, c.1020A > G and c.33_34insC and presented clinically with recurrent urinary tract infection, multiple urolithiasis and nephrocalcinosis under the age of 1 year and a persistent hyperoxaluria at the age of diagnosis. The two other patients presenting a less severe phenotypes were heterozygous for c.731 T > C and homozygous for the c.32C > T and c.1020A > G or compound heterozygous for c.26C > A and c.65A > G variants. Conclusion In Summary, we provided relevance regarding the compound heterozygous mutations in non consanguineous PH1 families with variable severity.
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Affiliation(s)
- Houda Kanoun
- Laboratoire de Génétique Moléculaire Humaine, Faculté de Médecine de Sfax, Université de Sfax, Sfax, Tunisie. .,Unité de Recherche Pathologie rénale UR12ES14 et Service de Néphrologie, Hôpital Hédi Chaker Sfax, Sfax, Tunisia.
| | - Faiçal Jarraya
- Unité de Recherche Pathologie rénale UR12ES14 et Service de Néphrologie, Hôpital Hédi Chaker Sfax, Sfax, Tunisia
| | - Bayen Maalej
- Unité de Recherche Pathologie rénale UR12ES14 et Service de Néphrologie, Hôpital Hédi Chaker Sfax, Sfax, Tunisia.,Service de Pédiatrie, Hôpital Hédi Chaker Sfax, Sfax, Tunisia
| | - Amina Lahiani
- Laboratoire de Biochimie, Hôpital Habib Bourguiba Sfax, Sfax, Tunisia
| | - Hichem Mahfoudh
- Unité de Recherche Pathologie rénale UR12ES14 et Service de Néphrologie, Hôpital Hédi Chaker Sfax, Sfax, Tunisia
| | - Fatma Makni
- Laboratoire de Biochimie, Hôpital Habib Bourguiba Sfax, Sfax, Tunisia
| | - Jamil Hachicha
- Unité de Recherche Pathologie rénale UR12ES14 et Service de Néphrologie, Hôpital Hédi Chaker Sfax, Sfax, Tunisia
| | - Faiza Fakhfakh
- Laboratoire de Génétique Moléculaire Humaine, Faculté de Médecine de Sfax, Université de Sfax, Sfax, Tunisie. .,Département des Sciences de la vie, Faculté des Sciences de Sfax, Université des Sfax, Sfax, Tunisia.
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11
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M'dimegh S, Omezzine A, M'barek I, Moussa A, Mabrouk S, Kaarout H, Souche G, Chemli J, Aloui S, Aquaviva-Bourdain C, Achour A, Abroug S, Bouslama A. Mutational Analysis of Agxt in Tunisian Population with Primary Hyperoxaluria Type 1. Ann Hum Genet 2016; 81:1-10. [PMID: 27935012 DOI: 10.1111/ahg.12178] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 11/10/2016] [Indexed: 01/25/2023]
Abstract
BACKGROUND Primary hyperoxaluria type 1 (PH1) is an autosomal recessive metabolic disorder caused by inherited mutations in the AGXT gene encoding liver peroxisomal alanine:glyoxylate aminotransferase (AGT). PH1 is a clinically and genetically heterogeneous disorder. The aim of our study was to analyze and characterize the mutational spectrum of PH1 in Tunisian patients. MATERIALS AND METHODS Molecular studies of 146 Tunisian patients suspected with PH were performed by PCR/Restriction fragment length polymorphism (RFLP) to detect seven mutations described as the most common. Direct sequencing for the 11 exons was performed in patients in whom any mutation was not identified. RESULTS The genetic diagnosis of PH1 was confirmed in 62.3% of patients. The first molecular approach based on PCR/restriction enzyme test was positive in 37.6% of patients, whereas the second molecular approach based on whole gene sequencing was successful in 24% of cases. Twelve pathogenic mutations were detected in our cohort. Two mutations were novel, and five were detected for the first time in Tunisians. The three most frequent mutations were p.Ile244Thr, p.Gly190Arg, and c.33dupC, with a frequency of 43.4%, 21.4%, and 13.1%, respectively. CONCLUSION The two novel mutations detected in our study extend the spectrum of known AGXT gene mutations. The screen for the mutations identified in this study can provide a useful, cost-effective, and first-line investigation in Tunisian PH1 patients.
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Affiliation(s)
- Saoussen M'dimegh
- Biochemistry Department, Sahloul University Hospital, Sousse, Tunisia
| | - Asma Omezzine
- Biochemistry Department, Sahloul University Hospital, Sousse, Tunisia
| | - Ibtihel M'barek
- Biochemistry Department, Sahloul University Hospital, Sousse, Tunisia
| | - Amira Moussa
- Biochemistry Department, Sahloul University Hospital, Sousse, Tunisia
| | - Sameh Mabrouk
- Biochemistry Department, Sahloul University Hospital, Sousse, Tunisia
| | - Hayet Kaarout
- Internal Medicine A Department, Charles Nicolle University Hospital, Tunis, Tunisia
| | - Geneviéve Souche
- Laboratory of Inborn Metabolic Diseases, Centre de Biologie Est, Hospices Civils de Lyon, Lyon, France
| | - Jalel Chemli
- Pediatric Department, Sahloul University Hospital, Sousse, Tunisia
| | - Sabra Aloui
- Nephrology Department, Fatouma Bourguiba University Hospital, Monastir, Tunisia
| | - Cécile Aquaviva-Bourdain
- Laboratory of Inborn Metabolic Diseases, Centre de Biologie Est, Hospices Civils de Lyon, Lyon, France
| | | | - Saoussen Abroug
- Pediatric Department, Sahloul University Hospital, Sousse, Tunisia
| | - Ali Bouslama
- Biochemistry Department, Sahloul University Hospital, Sousse, Tunisia
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Two novel AGXT mutations identified in primary hyperoxaluria type-1 and distinct morphological and structural difference in kidney stones. Sci Rep 2016; 6:33652. [PMID: 27644547 PMCID: PMC5028881 DOI: 10.1038/srep33652] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 08/30/2016] [Indexed: 12/02/2022] Open
Abstract
Primary hyperoxaluria type 1 (PH1) is a rare genetic disease characterized by excessive oxalate accumulation in plasma and urine, resulting in various phenotypes because of allelic and clinical heterogeneity. This study aimed to detect disease-associated genetic mutations in three PH1 patients in a Chinese family. All AGXT exons and 3 common polymorphisms which might synergistically interact with mutations, including P11L, I340 M and IVSI+74 bp were analyzed by direct sequencing in all family members. It demonstrated that in each of three patients, a previously reported nonsense mutation p.R333* was in cis with a novel missense mutation p.M49L in the minor allele characterized by the polymorphism of 74-bp duplication in intron 1, while the other novel missense mutation p.N72I was in trans with both p.R333* and P.M49L in the major allele. Kidney stones from two sibling patients were also observed though stereomicroscopic examination and scanning electron microscopy. Distinct morphological and inner-structure differences in calculi were noticed, suggesting clinical heterozygosity of PH1 to a certain extent. In brief, two novel missense mutations were identified probably in association with PH1, a finding which should provide an accurate tool for prenatal diagnosis, genetic counseling and screening for potential presymptomatic individuals.
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13
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Identification of a novel AGXT gene mutation in primary hyperoxaluria after kidney transplantation failure. Transpl Immunol 2016; 39:60-65. [PMID: 27568336 DOI: 10.1016/j.trim.2016.08.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Revised: 08/23/2016] [Accepted: 08/24/2016] [Indexed: 02/03/2023]
Abstract
Primary hyperoxaluria is a genetic disorder in glyoxylate metabolism that leads to systemic overproduction of oxalate. Functional deficiency of alanine-glyoxylate aminotransferase in this disease leads to recurrent nephrolithiasis, nephrocalcinosis, systemic oxalosis, and kidney failure. The aim of this study was to determine the molecular etiology of kidney transplant loss in a young Tunisian individual. We present a young man with end-stage renal disease who received a kidney allograft and experienced early graft failure. There were no improvement in kidney function; he required hemodialysis and graft biopsy revealed calcium oxalate crystals, which raised suspicion of primary hyperoxaluria. Genetic study in the AGXT gene by PCR direct sequencing identified three missense changes in heterozygote state: the p. Gly190Arg mutation next to two other novels not previously described. The classification of the deleterious effect of the missense changes was developed using the summered results of four different mutation assessment algorithms, SIFT, PolyPhen, Mutation Taster, and Align-GVGD. This system classified the changes as polymorphism in one and as mutation in other. The patient was compound heterozygous mutations. Structural analysis showed that the novel mutation, p.Pro28Ser mutation, affects near the dimerization interface of AGT and positioned on binding site instead of the inhibitor, amino-oxyacetic acid (AOA). With the novel AGXT mutation, the mutational spectrum of this gene continues to broaden in our population. The diagnosis of PH1 was not recognized until after renal transplant with fatal consequences, which led us to confirm the importance of screening before planning for kidney transplantation in population with a relatively high frequency of AGXT mutation carriers.
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A novel mutation in the AGXT gene causing primary hyperoxaluria type I: genotype–phenotype correlation. J Genet 2016; 95:659-66. [DOI: 10.1007/s12041-016-0676-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Dutta AK, Paulose BK, Danda S, Alexander S, Tamilarasi V, Omprakash S. Recurrent truncating mutations in alanine-glyoxylate aminotransferase gene in two South Indian families with primary hyperoxaluria type 1 causing later onset end-stage kidney disease. Indian J Nephrol 2016; 26:288-90. [PMID: 27512303 PMCID: PMC4964691 DOI: 10.4103/0971-4065.171244] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Primary hyperoxaluria type 1 is an autosomal recessive inborn error of metabolism due to liver-specific peroxisomal enzyme alanine-glyoxylate transaminase deficiency. Here, we describe two unrelated patients who were diagnosed to have primary hyperoxaluria. Homozygous c.445_452delGTGCTGCT (p.L151Nfs*14) (Transcript ID: ENST00000307503; human genome assembly GRCh38.p2) (HGMD ID CD073567) mutation was detected in both the patients and the parents were found to be heterozygous carriers. Our patients developed end-stage renal disease at 23 years and 35 years of age. However, in the largest series published from OxalEurope cohort, the median age of end-stage renal disease for null mutations carriers was 9.9 years, which is much earlier than our cases. Our patients had slower progressions as compared to three unrelated patients from North India and Pakistan, who had homozygous c.302T>C (p.L101P) (HGMD ID CM093792) mutation in exon 2. Further, patients need to be studied to find out if c.445_452delGTGCTGCT mutation represents a founder mutation in Southern India.
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Affiliation(s)
- A. K. Dutta
- Department of Medical Genetics, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - B. K. Paulose
- Department of Nephrology, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - S. Danda
- Department of Medical Genetics, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - S. Alexander
- Department of Nephrology, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - V. Tamilarasi
- Department of Nephrology, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - S. Omprakash
- Department of Medical Genetics, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
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Boualla L, Tajir M, Oulahiane N, Lyahyai J, Laarabi FZ, Chafai Elalaoui S, Soulami K, Ait Ouamar H, Sefiani A. AGXT Gene Mutations and Prevalence of Primary Hyperoxaluria Type 1 in Moroccan Population. Genet Test Mol Biomarkers 2015; 19:623-8. [PMID: 26383609 DOI: 10.1089/gtmb.2015.0136] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
INTRODUCTION Primary hyperoxaluria type 1 (PH1) is an autosomal recessive disorder caused by deficiency of alanine glyoxylate aminotransferase, due to a defect in the AGXT gene. Several mutations in this gene have been reported and some of them have been observed in multiple populations. The aim of our study was to analyze the mutations causing PH1 in the Moroccan population and to estimate its prevalence in Morocco. METHODS Molecular studies of 29 unrelated Moroccan patients with PH were performed by direct sequencing of all exons of the AGXT gene. In addition, to estimate the prevalence of PH1, we screened for the recurrent p.Ile244Thr mutation in 250 unrelated Moroccan newborns using real-time polymerase chain reaction. RESULTS Four pathogenic mutations were detected in 25 unrelated patients. The c.731T>C (p.Ile244Thr) was the most frequent mutation with a frequency of 84%. The other three mutations were c.33delC, c.976delG, and c.331C>T. The prevalence of the PH1 mutation among Moroccans was then estimated to range from 1/7267 to 1/6264. CONCLUSION PH1 is one of the most prevalent genetic diseases in the Moroccan population and is probably underdiagnosed. Front line genetic testing for PH1 in Morocco should be initiated using an assay for the recurrent p.Ile244Thr mutation. This strategy would provide a useful tool for precocious diagnosis of presymptomatic individuals and to prevent their rapid progression to renal failure.
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Affiliation(s)
- Lamiae Boualla
- 1 Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V , Rabat, Maroc.,2 Département de Génétique Médicale, Institut National d'Hygiène , Rabat, Maroc
| | - Mariam Tajir
- 2 Département de Génétique Médicale, Institut National d'Hygiène , Rabat, Maroc.,3 Service de Génétique, CHU Mohammed VI , Marrakech, Maroc
| | - Najat Oulahiane
- 4 Service Pédiatrie IV, Hôpital d'Enfant , CHU Ibn Sina, Rabat, Maroc
| | - Jaber Lyahyai
- 1 Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V , Rabat, Maroc.,2 Département de Génétique Médicale, Institut National d'Hygiène , Rabat, Maroc
| | | | - Siham Chafai Elalaoui
- 1 Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V , Rabat, Maroc.,2 Département de Génétique Médicale, Institut National d'Hygiène , Rabat, Maroc
| | - Kenza Soulami
- 5 Cabinet of pediatric Nephrology , Casablanca, Maroc
| | - Hassan Ait Ouamar
- 4 Service Pédiatrie IV, Hôpital d'Enfant , CHU Ibn Sina, Rabat, Maroc
| | - Abdelaziz Sefiani
- 1 Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V , Rabat, Maroc.,2 Département de Génétique Médicale, Institut National d'Hygiène , Rabat, Maroc
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Bollée G, Cochat P, Daudon M. Recurrence of crystalline nephropathy after kidney transplantation in APRT deficiency and primary hyperoxaluria. Can J Kidney Health Dis 2015; 2:31. [PMID: 26380104 PMCID: PMC4570695 DOI: 10.1186/s40697-015-0069-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 07/24/2015] [Indexed: 01/25/2023] Open
Abstract
Purpose of review To provide transplant physicians with a summary of the pathogenesis and diagnosis of adenine phosphoribosyl transferase (APRT) deficiency and primary hyperoxaluria and, focussed on kidney transplantation, and to discuss interventions aimed at preventing and treating the recurrence of crystalline nephropathy in renal transplant recipients. Source of information Pubmed literature search. Setting Primary hyperoxaluria and APRT deficiency are rare inborn errors of human metabolism. The hallmark of these diseases is the overproduction and urinary excretion of compounds (2,8 dihydroxyadenine in APRT deficiency, oxalate in primary hyperoxaluria) that form urinary crystals. Although recurrent urolithiasis represents the main clinical feature of these diseases, kidney injury can occur as a result of crystal precipitation within the tubules and interstitium, a condition referred to as crystalline nephropathy. Some patients develop end-stage renal disease (ESRD) and may become candidates for kidney transplantation. Since kidney transplantation does not correct the underlying metabolic defect, transplant recipients have a high risk of recurrence of crystalline nephropathy, which can lead to graft loss. In some instances, the disease remains undiagnosed until after the occurrence of ESRD or even after kidney transplantation. Key messages Patients with APRT deficiency or primary hyperoxaluria may develop ESRD as a result of crystalline nephropathy. In the absence of diagnosis and adequate management, the disease is likely to recur after kidney transplantation, which often leads to rapid loss of renal allograft function. Primary hyperoxaluria, but not APRT deficiency, becomes a systemic disease at low GFR with oxalate deposition leading to malfunction in non-renal organs (systemic oxalosis). We suggest that these diagnoses should be considered in patients with low glomerular filtration rate (GFR) and a history of kidney stones. In APRT deficiency, stones may be confused with uric acid stones, unless specialized techniques are used (infrared spectroscopy or X-ray crystallography for urinary crystals or stone analysis; Fourier transform infrared microscopy for crystals in kidney biopsy). Where these are unavailable, and for confirmation, the diagnosis can be made by measurement of enzyme activity in red blood cell lysates or by genetic testing. In patients with primary hyperoxaluria, levels of urinary and plasma oxalate; and the presence of nearly pure calcium oxalate monohydrate in stones, which often also have an unusually pale colour and unorganized structure, increase diagnostic suspicion. Molecular genetic testing is the criterion measure. Lifelong allopurinol therapy, with high fluid intake if appropriate, may stabilize kidney function in APRT deficiency; if ESRD has occurred or is near, results with kidney transplantation after initiation of allopurinol are excellent. In primary hyperoxaluria recognized before ESRD, pyridoxine treatment and high fluid intake may lead to a substantial decrease in urinary calcium oxalate supersaturation and prevent renal failure. In non-responsive patients or those recognized later in their disease, liver transplantation cures the underlying defect and should be considered when the GFR falls below 30 ml/min/1.73 m2; in those which or near ESRD, liver transplantation and intensive dialysis before kidney transplantation may be considered to reduce the total body oxalate burden before kidney transplantation. Limitations The availability of diagnostic tests varies between countries and centres. Data on long term outcomes after kidney transplantation are limited, especially for APRT deficiency patients. Implications Increasing transplant physicians knowledge of APRT deficiency and primary hyperoxaluria should enable them to implement adequate diagnostic and therapeutic interventions, thereby achieving good outcomes after kidney transplantation.
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Affiliation(s)
- Guillaume Bollée
- Division of Nephrology and Research Centre of the Centre Hospitalier de l'Université de Montréal and Université de Montréal, Montréal, Québec Canada ; Division of Nephrology, Hôpital Notre Dame, 1560 Sherbrooke Street East, Montreal, QC H2L 4 M1 Canada
| | - Pierre Cochat
- Centre de Référence des Maladies Rénales Rares, Hospices Civils de Lyon and Université Claude-Bernard Lyon 1, Lyon, France
| | - Michel Daudon
- Service d'Explorations Fonctionnelles, AP-HP, Hôpital Tenon, Paris, France
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Martucci VL, Emaminia A, del Rivero J, Lechan RM, Magoon BT, Galia A, Fojo T, Leung S, Lorusso R, Jimenez C, Shulkin BL, Audibert JL, Adams KT, Rosing DR, Vaidya A, Dluhy RG, Horvath KA, Pacak K. Succinate dehydrogenase gene mutations in cardiac paragangliomas. Am J Cardiol 2015; 115:1753-9. [PMID: 25896150 DOI: 10.1016/j.amjcard.2015.03.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 03/13/2015] [Accepted: 03/13/2015] [Indexed: 01/13/2023]
Abstract
Pheochromocytomas and paragangliomas are chromaffin cell tumors arising from neuroendocrine cells. At least 1/3 of paragangliomas are related to germline mutations in 1 of 17 genes. Although these tumors can occur throughout the body, cardiac paragangliomas are very rare, accounting for <0.3% of mediastinal tumors. The purpose of this study was to determine the clinical characteristics of patients with cardiac paragangliomas, particularly focusing on their genetic backgrounds. A retrospective chart analysis of 15 patients with cardiac paragangliomas was performed to determine clinical presentation, genetic background, diagnostic workup, and outcomes. The average age at diagnosis was 41.9 years. Typical symptoms of paraganglioma (e.g., hypertension, sweating, palpitations, headache) were reported at initial presentation in 13 patients (86.7%); the remaining 2, as well as 4 symptomatic patients, initially presented with cardiac-specific symptoms (e.g., chest pain, dyspnea). Genetic testing was done in 13 patients (86.7%); 10 (76.9%) were positive for mutations in succinate dehydrogenase (SDHx) subunits B, C, or D. Thirteen patients (86.7%) underwent surgery to remove the paraganglioma with no intraoperative morbidity or mortality; 1 additional patient underwent surgical resection but experienced intraoperative complications after removal of the tumor due to co-morbidities and did not survive. SDHx mutations are known to be associated with mediastinal locations and malignant behavior of paragangliomas. In this report, the investigators extend the locations of predominantly SDHx-related paragangliomas to cardiac tumors. In conclusion, cardiac paragangliomas are frequently associated with underlying SDHx germline mutations, suggesting a need for genetic testing of all patients with this rare tumor.
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Affiliation(s)
- Victoria L Martucci
- Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
| | - Abbas Emaminia
- Cardiothoracic Surgery Research Program, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Jaydira del Rivero
- Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
| | - Ronald M Lechan
- Division of Endocrinology, Diabetes and Metabolism, Tufts Medical Center, Boston, Massachusetts
| | - Bindiya T Magoon
- Division of Endocrinology, Diabetes and Metabolism, Tufts Medical Center, Boston, Massachusetts
| | - Analyza Galia
- Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland; Section of Endocrinology and Metabolism, University of Santo Tomas Hospital, Manila, Philippines
| | - Tito Fojo
- Medical Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Steve Leung
- Cardiovascular and Pulmonary Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland; Division of Cardiovascular Medicine, Department of Medicine, University of Kentucky, Lexington, Kentucky
| | - Roberto Lorusso
- Cardiac Surgery Unit, Spedali Civili Hospital, Brescia, Italy
| | - Camilo Jimenez
- Department of Endocrine Neoplasia and Hormonal Disorders, University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Barry L Shulkin
- Division of Nuclear Medicine, St. Jude Children's Research Hospital, Memphis, Tennessee
| | - Jennifer L Audibert
- Cardiovascular and Pulmonary Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Karen T Adams
- Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
| | - Douglas R Rosing
- Cardiovascular and Pulmonary Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Anand Vaidya
- Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Robert G Dluhy
- Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Keith A Horvath
- Cardiothoracic Surgery Research Program, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Karel Pacak
- Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland.
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Primary hyperoxaluria type 1 in 18 children: genotyping and outcome. Int J Nephrol 2015; 2015:634175. [PMID: 25918646 PMCID: PMC4396551 DOI: 10.1155/2015/634175] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2015] [Revised: 03/16/2015] [Accepted: 03/16/2015] [Indexed: 01/28/2023] Open
Abstract
Background. Primary hyperoxaluria belongs to a group of rare metabolic disorders with autosomal recessive inheritance. It results from genetic mutations of the AGXT gene, which is more common due to higher consanguinity rates in the developing countries. Clinical features at presentation are heterogeneous even in children from the same family; this study was conducted to determine the clinical characteristics, type of AGXT mutation, and outcome in children diagnosed with PH1 at a tertiary referral center in Oman. Method. Retrospective review of children diagnosed with PH1 at a tertiary hospital in Oman from 2000 to 2013. Result. Total of 18 children were identified. Females composed 61% of the children with median presentation age of 7 months. Severe renal failure was initial presentation in 39% and 22% presented with nephrocalcinosis and/or renal calculi. Family screening diagnosed 39% of patients. Fifty percent of the children underwent hemodialysis. 28% of children underwent organ transplantation. The most common mutation found in Omani children was c.33-34insC mutation in the AGXT gene. Conclusion. Due to consanguinity, PH1 is a common cause of ESRD in Omani children. Genetic testing is recommended to help in family counseling and helps in decreasing the incidence and disease burden; it also could be utilized for premarital screening.
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Martucci VL, Lorenzo ZG, Weintraub M, del Rivero J, Ling A, Merino M, Siddiqui M, Shuch B, Vourganti S, Linehan WM, Agarwal PK, Pacak K. Association of urinary bladder paragangliomas with germline mutations in the SDHB and VHL genes. Urol Oncol 2015; 33:167.e13-20. [PMID: 25683602 DOI: 10.1016/j.urolonc.2014.11.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 11/02/2014] [Accepted: 11/26/2014] [Indexed: 11/18/2022]
Abstract
OBJECTIVE Our primary goal was to examine the clinical characteristics of a series of patients with urinary bladder paragangliomas (UBPGLs), focusing particularly on their genetic backgrounds. MATERIALS AND METHODS We analyzed the medical records of patients who presented to the National Institutes of Health with UBPGL from 2000 to 2013 to determine their clinical characteristics and outcomes, biochemical phenotype, tumor size, and genetic background. RESULTS Of the 27 patients with UBPGLs who were identified, 17 (63%) had underlying genetic mutations. Overall, 14 (51.9%) patients had a germline mutation in the succinate dehydrogenase subunit B gene (SDHB), and 3 (11.1%) had mutations in the von Hippel-Lindau gene (VHL). Of the 21 patients who had biochemical data available before their first operation, 19 (90.5%) presented with a noradrenergic biochemical phenotype; 7 (33.3%) patients had tumors that also secreted dopamine. In addition, 1 patient (4.8%) had elevated metanephrine levels, and 2 (9.5%) had normal biochemical data. In total, 13 (48.1%) patients in the series were diagnosed with metastatic disease, at either first presentation or follow-up; 6 of these patients (46.1%) had SDHB mutations. CONCLUSIONS UBPGLs typically present with a noradrenergic phenotype and are frequently associated with underlying germline mutations. Patients presenting with these rare neuroendocrine tumors should be screened for these mutations. In addition, patients with UBPGLs should be followed up closely for metastatic development regardless of genetic background, as almost half of the patients in this series presented with metastatic disease and less than half of them had SDHB mutations.
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Affiliation(s)
- Victoria L Martucci
- Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD
| | - Zarina G Lorenzo
- Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD; Section of Endocrinology and Metabolism, Department of Medicine, University of Santo Tomas Hospital, Manila, Philippines
| | | | - Jaydira del Rivero
- Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD
| | - Alexander Ling
- Radiology and Imaging Sciences Department, Warren Magnuson Clinical Center, National Institutes of Health, Bethesda, MD
| | - Maria Merino
- Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, MD
| | - Minhaj Siddiqui
- Urologic Oncology Branch, National Cancer Institute, Bethesda, MD
| | - Brian Shuch
- Urologic Oncology Branch, National Cancer Institute, Bethesda, MD
| | | | | | - Piyush K Agarwal
- Urologic Oncology Branch, National Cancer Institute, Bethesda, MD.
| | - Karel Pacak
- Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD.
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22
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[Nephrolithiasis: metabolic defects and terapeutic implications]. Urologia 2014; 81:1-11. [PMID: 24744215 DOI: 10.5301/uro.5000058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/26/2014] [Indexed: 12/31/2022]
Abstract
Over the past 10 years, major progress has been made in the knowledge of urinary lithogenesis, including the potential pathogenetic role of Randall's plaques and renal tubular crystal retention. Urine supersaturation is the driving force of this process and can be induced by some risk factors, including low urine volume, high urinary excretion of calcium oxalate and uric acid and low urinary excretion of citrate. Primary hypercalciuria can be due to intestinal overabsorption renal leak and bone reabsorption of calcium. Prophilaxis is mainly conducted with thiazides and low calcium diet which is indicated only in the intestinal form. Primary hyperoxaluria is treated with pyridoxine and may require in the severe forms simultaneous renal and liver transplantation. Enteric hyperoxaluria is secondary to fatty acids malabsorption and requires diet, oral calcium and cholestiramine. Hyperuricosuria is caused by diet endogenous overproduction, mainly due to enzymatic defects or high renal excretion of uric acid. Urine alkalinization with K or K and Mg citrate can prevent stone formation even in idiopathic uric acid nephrolithiasis, in which a defect of urine acidification is supposed to be the main abnormality, and in hypocitraturic patients. Cystinuria is a rare inherited defect with an intense clinical impact. It can be classified in three forms and urinary stone formation is the role. Increased solubility and conversion of cystine in a more soluble form are the main goals of the prophylaxis which includes K citrate and thiol agents administration. Tiopronin is preferred to D-penicillamine due to its lower side effects.
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Lage MD, Pittman AMC, Roncador A, Cellini B, Tucker CL. Allele-specific characterization of alanine: glyoxylate aminotransferase variants associated with primary hyperoxaluria. PLoS One 2014; 9:e94338. [PMID: 24718375 PMCID: PMC3981788 DOI: 10.1371/journal.pone.0094338] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 03/13/2014] [Indexed: 11/19/2022] Open
Abstract
Primary Hyperoxaluria Type 1 (PH1) is a rare autosomal recessive kidney stone disease caused by deficiency of the peroxisomal enzyme alanine: glyoxylate aminotransferase (AGT), which is involved in glyoxylate detoxification. Over 75 different missense mutations in AGT have been found associated with PH1. While some of the mutations have been found to affect enzyme activity, stability, and/or localization, approximately half of these mutations are completely uncharacterized. In this study, we sought to systematically characterize AGT missense mutations associated with PH1. To facilitate analysis, we used two high-throughput yeast-based assays: one that assesses AGT specific activity, and one that assesses protein stability. Approximately 30% of PH1-associated missense mutations are found in conjunction with a minor allele polymorphic variant, which can interact to elicit complex effects on protein stability and trafficking. To better understand this allele interaction, we functionally characterized each of 34 mutants on both the major (wild-type) and minor allele backgrounds, identifying mutations that synergize with the minor allele. We classify these mutants into four distinct categories depending on activity/stability results in the different alleles. Twelve mutants were found to display reduced activity in combination with the minor allele, compared with the major allele background. When mapped on the AGT dimer structure, these mutants reveal localized regions of the protein that appear particularly sensitive to interactions with the minor allele variant. While the majority of the deleterious effects on activity in the minor allele can be attributed to synergistic interaction affecting protein stability, we identify one mutation, E274D, that appears to specifically affect activity when in combination with the minor allele.
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Affiliation(s)
| | | | - Alessandro Roncador
- Department of Life Sciences and Reproduction, Section of Biological Chemistry, University of Verona, Verona, Italy
| | - Barbara Cellini
- Department of Life Sciences and Reproduction, Section of Biological Chemistry, University of Verona, Verona, Italy
| | - Chandra L. Tucker
- Department of Biology, Duke University, Durham, NC, USA
- Department of Pharmacology, University of Colorado Denver School of Medicine, Aurora, CO, USA
- * E-mail:
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Kanoun H, Jarraya F, Hadj Salem I, Mahfoudh H, Chaabouni Y, Makni F, Hachicha J, Fakhfakh F. A double mutation in AGXT gene in families with primary hyperoxaluria type 1. Gene 2013; 531:451-6. [DOI: 10.1016/j.gene.2013.08.083] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Accepted: 08/26/2013] [Indexed: 11/26/2022]
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Edvardsson VO, Goldfarb DS, Lieske JC, Beara-Lasic L, Anglani F, Milliner DS, Palsson R. Hereditary causes of kidney stones and chronic kidney disease. Pediatr Nephrol 2013; 28:1923-42. [PMID: 23334384 PMCID: PMC4138059 DOI: 10.1007/s00467-012-2329-z] [Citation(s) in RCA: 157] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 09/13/2012] [Accepted: 09/17/2012] [Indexed: 01/27/2023]
Abstract
Adenine phosphoribosyltransferase (APRT) deficiency, cystinuria, Dent disease, familial hypomagnesemia with hypercalciuria and nephrocalcinosis (FHHNC), and primary hyperoxaluria (PH) are rare but important causes of severe kidney stone disease and/or chronic kidney disease in children. Recurrent kidney stone disease and nephrocalcinosis, particularly in pre-pubertal children, should alert the physician to the possibility of an inborn error of metabolism as the underlying cause. Unfortunately, the lack of recognition and knowledge of the five disorders has frequently resulted in an unacceptable delay in diagnosis and treatment, sometimes with grave consequences. A high index of suspicion coupled with early diagnosis may reduce or even prevent the serious long-term complications of these diseases. In this paper, we review the epidemiology, clinical features, diagnosis, treatment, and outcome of patients with APRT deficiency, cystinuria, Dent disease, FHHNC, and PH, with an emphasis on childhood manifestations.
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MESH Headings
- Adenine Phosphoribosyltransferase/deficiency
- Adenine Phosphoribosyltransferase/genetics
- Animals
- Child
- Cystinuria/diagnosis
- Cystinuria/epidemiology
- Cystinuria/genetics
- Cystinuria/therapy
- Dent Disease/diagnosis
- Dent Disease/epidemiology
- Dent Disease/genetics
- Dent Disease/therapy
- Genetic Predisposition to Disease
- Heredity
- Humans
- Hypercalciuria/diagnosis
- Hypercalciuria/epidemiology
- Hypercalciuria/genetics
- Hypercalciuria/therapy
- Hyperoxaluria, Primary/diagnosis
- Hyperoxaluria, Primary/epidemiology
- Hyperoxaluria, Primary/genetics
- Hyperoxaluria, Primary/therapy
- Kidney Calculi/diagnosis
- Kidney Calculi/epidemiology
- Kidney Calculi/genetics
- Kidney Calculi/therapy
- Metabolism, Inborn Errors/diagnosis
- Metabolism, Inborn Errors/epidemiology
- Metabolism, Inborn Errors/genetics
- Metabolism, Inborn Errors/therapy
- Nephrocalcinosis/diagnosis
- Nephrocalcinosis/epidemiology
- Nephrocalcinosis/genetics
- Nephrocalcinosis/therapy
- Phenotype
- Prognosis
- Renal Insufficiency, Chronic/diagnosis
- Renal Insufficiency, Chronic/epidemiology
- Renal Insufficiency, Chronic/genetics
- Renal Insufficiency, Chronic/therapy
- Renal Tubular Transport, Inborn Errors/diagnosis
- Renal Tubular Transport, Inborn Errors/epidemiology
- Renal Tubular Transport, Inborn Errors/genetics
- Renal Tubular Transport, Inborn Errors/therapy
- Risk Factors
- Urolithiasis/diagnosis
- Urolithiasis/epidemiology
- Urolithiasis/genetics
- Urolithiasis/therapy
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Mutation spectrum of primary hyperoxaluria type 1 in Tunisia: implication for diagnosis in North Africa. Gene 2013; 527:316-20. [PMID: 23810941 DOI: 10.1016/j.gene.2013.06.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 05/30/2013] [Accepted: 06/08/2013] [Indexed: 11/20/2022]
Abstract
BACKGROUND Primary hyperoxaluria type 1 (PH1) is an autosomal recessive inherited metabolic disease, characterized by progressive kidney failure due to renal deposition of calcium oxalate. Mutations in the AGXT gene, encoding the liver-specific enzyme alanine glyoxylate aminotransferase, are responsible for the disease. We aimed to determine the mutational spectrum causing PH1 and to provide an accurate tool for diagnosis as well as for prenatal diagnosis in the affected families. METHODS Direct sequencing was used to detect mutations in the AGXT gene in DNA samples from 13 patients belonging to 12 Tunisian families. RESULTS Molecular analysis revealed five mutations causing PH1 in Tunisia. The mutations were identified along exons 1, 2, 4, 5 and 7. The most predominant mutations were the Maghrebian "p.I244T" and the Arabic "p.G190R". Furthermore, three other mutations characteristic of different ethnic groups were found in our study population. These results confirm the mutational heterogeneity related to PH1 in Tunisian population. All the mutations are in a homozygous state, reflecting the high impact of endogamy in our population. CONCLUSION Mutation analysis through DNA sequencing can provide a useful first line investigation for PH1. This identification could provide an accurate tool for prenatal diagnosis, genetic counseling and screen for potential presymptomatic individuals.
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Rao NM, Yallapragada A, Winden KD, Saver J, Liebeskind DS. Stroke in primary hyperoxaluria type I. J Neuroimaging 2013; 24:411-3. [PMID: 23551880 DOI: 10.1111/jon.12020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Revised: 11/20/2012] [Accepted: 12/21/2012] [Indexed: 11/30/2022] Open
Abstract
We report the case of a 27-year-old man with a history of previously undiagnosed renal disease that presented with multiple cerebrovascular infarctions. Workup for traditional causes of cerebrovascular infarction including cardiac telemetry, multiple echocardiograms, and hypercoagulative workup was negative. However, a transcranial Doppler detected circulating microemboli at the rate of 14 per hour. A serum oxalate level greater than the supersaturation point of calcium oxalate was detected, providing a potential source of the microemboli. Furthermore, serial imaging recorded rapid mineralization of the infarcted territories. In the absence of any proximal vessel irregularities, atherosclerosis, valvular abnormalities, arrhythmias, or systemic shunt as potential stroke etiology in this patient, we propose that circulating oxalate precipitate may be a potential mechanism for stroke in patients with primary oxalosis.
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Affiliation(s)
- Neal M Rao
- David Geffen School of Medicine at UCLA, Los Angeles, CA
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28
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Ferraro PM, D'Addessi A, Gambaro G. When to suspect a genetic disorder in a patient with renal stones, and why. Nephrol Dial Transplant 2013; 28:811-20. [PMID: 23291371 DOI: 10.1093/ndt/gfs545] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Nephrolithiasis is a common disorder, with a rising prevalence in the general population. Its pathogenesis is still unclear, but a role for genetics has long been recognized, especially in cases of the more common calcium nephrolithiasis. Although relatively rare, monogenic causes of hypercalciuria and nephrolithiasis do exist and their timely recognition is important from a prognostic and therapeutic viewpoint. This article reviews the clinical and laboratory findings characterizing inherited causes of nephrolithiasis with a view to helping clinicians to recognize and manage these rare conditions.
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Affiliation(s)
- Pietro Manuel Ferraro
- Division of Nephrology, Department of Internal Medicine and Medical Specialties, Columbus-Gemelli University Hospital, Catholic University, Rome, Italy
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Spierings G, Dunbar SA. Pharmacogenetics using Luminex® xMAP® technology: a method for developing a custom multiplex single nucleotide polymorphism mutation assay. Methods Mol Biol 2013; 1015:115-26. [PMID: 23824852 DOI: 10.1007/978-1-62703-435-7_7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Sequence variations in the human genome can affect the development of diseases and provide markers for the identification of genetic diseases and drug susceptibility. Single Nucleotide Polymorphisms (SNPs), the most abundant sequence variations in the genome, are used in pharmacogenetics as indicators of drug therapy efficacy in individuals and are important road maps in the route to personalized medicine. This chapter describes the development of PCR based custom multiplex SNP mutation analysis assays using Luminex(®) Multi-Analyte Profiling (xMAP(®)) Technology. Up to 500 different mutations can be detected in a single well and up to 384 samples can be analyzed per run.
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30
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Beck BB, Hoyer-Kuhn H, Göbel H, Habbig S, Hoppe B. Hyperoxaluria and systemic oxalosis: an update on current therapy and future directions. Expert Opin Investig Drugs 2012; 22:117-29. [PMID: 23167815 DOI: 10.1517/13543784.2013.741587] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
INTRODUCTION The primary hyperoxalurias (PH) are rare, but underdiagnosed disorders where the loss of enzymatic activity in key compounds of glyoxylate metabolism results in excessive endogenous oxalate generation. Clinically, they are characterized by recurrent urolithiasis and/or nephrocalcinosis. PH type I is the most frequent and most devastating subtype often leading to early end-stage renal failure. AREAS COVERED Profound overview of clinical, diagnostic, and currently available treatment options with a focus on PH I at different stages of the disease. Discussion of future therapeutic avenues including pharmacological chaperones (small molecules rescuing protein function), gene therapy with safer adenoviral vectors, and potential application of cell-based transplantation strategies is provided. EXPERT OPINION Due to lack of familiarity with PH and its heterogeneous clinical expression, diagnosis is often delayed until advanced disease is present, a condition, requiring intensive hemodialysis and timely transplantation. Achieving the most beneficial outcome largely depends on the knowledge of the clinical spectrum, early diagnosis, and initiation of treatment before renal failure ensues. A number of preconditions required for substantial improvement in the care of orphan disease like PH have now been achieved or soon will come within reach, so new treatment options can be expected in the near future.
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Affiliation(s)
- Bodo B Beck
- University of Cologne, Institute of Human Genetics, Cologne, Germany
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31
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van der Hoeven SM, van Woerden CS, Groothoff JW. Primary hyperoxaluria type 1, a too often missed diagnosis and potentially treatable cause of end-stage renal disease in adults: results of the Dutch cohort. Nephrol Dial Transplant 2012; 27:3855-62. [PMID: 22844106 DOI: 10.1093/ndt/gfs320] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Primary hyperoxaluria Type 1, an inherited disorder with increased endogenous oxalate production, leads to the development of urolithiasis, nephrocalcinosis and end-stage renal disease (ESRD). Contrary to the general belief that patients diagnosed during adulthood experience a relatively mild course of disease, we were confronted with several cases of ESRD caused by previously undiagnosed primary hyperoxaluria. METHODS To study renal and patient survival in relation with genotype, age at onset of disease and therapeutic delay, we performed a nationwide search among all Dutch nephrologists and paediatric nephrologists. RESULTS Of the 79 included patients, 38% was diagnosed at an adult age. ESRD was present at the time of diagnosis in 26% of paediatric diagnosed patients versus 52% of adult-diagnosed patients (P = 0.021). Homozygosity for the pyridoxine-responsive p.Gly170Arg or p.Phe152Ile genotype was found in 26% of paediatric diagnosed patients versus 68% of adult-diagnosed patients (P < 0.001). Of homozygous p.Gly170Arg or p.Phe152Ile patients, 48% developed ESRD at a median age of 37 years, compared with 48% in those with other mutations at a median age of 0.5 years (P < 0.001). Of the 16 patients found through family screening, 81% had a preserved renal function. CONCLUSIONS The high prevalence of pyridoxine-responsive genotypes and favourably prognosis of timely treatment warrant early diagnostic screening for primary hyperoxaluria Type 1 in patients with recurrent urolithiasis. This will preserve kidney function and prevent diagnosis of adult diagnosed patients in ESRD.
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Affiliation(s)
- S M van der Hoeven
- Department of Paediatrics, University of Amsterdam, Amsterdam, The Netherlands
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Tammachote R, Kingsuwannapong N, Tongkobpetch S, Srichomthong C, Yeetong P, Kingwatanakul P, Monico CG, Suphapeetiporn K, Shotelersuk V. Primary hyperoxaluria type 1 and brachydactyly mental retardation syndrome caused by a novel mutation in AGXT and a terminal deletion of chromosome 2. Am J Med Genet A 2012; 158A:2124-30. [PMID: 22821680 DOI: 10.1002/ajmg.a.35495] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Accepted: 05/07/2012] [Indexed: 12/12/2022]
Abstract
Primary hyperoxaluria type 1 (PH1) is an autosomal recessive disorder caused by mutations in the alanine:glyoxylate aminotransferase (AGXT) gene, located on chromosome 2q37. Mutant AGXT leads to excess production and excretion of oxalate, resulting in accumulation of calcium oxalate in the kidney, and progressive loss of renal function. Brachydactyly mental retardation syndrome (BDMR) is an autosomal dominant disorder, caused by haploinsufficiency of histone deacetylase 4 (HDAC4), also on chromosome 2q37. It is characterized by skeletal abnormalities and developmental delay. Here, we report on a girl who had phenotypes of both PH1 and BDMR. PCR-sequencing of the coding regions of AGXT showed a novel missense mutation, c.32C>G (p.Pro11Arg) inherited from her mother. Functional analyses demonstrated that it reduced the enzymatic activity to 31% of the wild-type and redirected some percentage of the enzyme away from the peroxisome. Microsatellite and array-CGH analyses indicated that the proband had a paternal de novo telomeric deletion of chromosome 2q, which included HDAC4. To our knowledge, this is the first report of PH1 and BDMR, with a novel AGXT mutation and a de novo telomeric deletion of chromosome 2q.
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Affiliation(s)
- Rachaneekorn Tammachote
- Faculty of Science, Human Genetics Research, Department of Botany, Chulalongkorn University, Bangkok, Thailand
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Abstract
The autosomal recessive inherited primary hyperoxalurias types I, II and III are caused by defects in glyoxylate metabolism that lead to the endogenous overproduction of oxalate. Type III primary hyperoxaluria was first described in 2010 and further types are likely to exist. In all forms, urinary excretion of oxalate is strongly elevated (>1 mmol/1.73 m(2) body surface area per day; normal <0.5 mmol/1.73 m(2) body surface area per day), which results in recurrent urolithiasis and/or progressive nephrocalcinosis. All entities can induce kidney damage, which is followed by reduced oxalate elimination and consequent systemic deposition of calcium oxalate crystals. Systemic oxalosis should be prevented, but diagnosis is all too often missed or delayed until end-stage renal disease (ESRD) occurs; this outcome occurs in >30% of patients with primary hyperoxaluria type I. The fact that such a large proportion of patients have such poor outcomes is particularly unfortunate as ESRD can be delayed or even prevented by early intervention. Treatment options for primary hyperoxaluria include alkaline citrate, orthophosphate, or magnesium. In addition, pyridoxine treatment can be used to normalize or reduce oxalate excretion in about 30% of patients with primary hyperoxaluria type I. Time on dialysis should be short to avoid overt systemic oxalosis. Transplantation methods depend on the type of primary hyperoxaluria and on the particular patient, but combined liver and kidney transplantation is the method of choice in patients with primary hyperoxaluria type I and isolated kidney transplantation is the preferred method in those with primary hyperoxaluria type II. To the best of our knowledge, progression to ESRD has not yet been reported in any patient with primary hyperoxaluria type III.
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Abstract
Urolithiasis affects approximately 10% of individuals in Western societies by the seventh decade of life. The most common form, idiopathic calcium oxalate urolithiasis, results from the interaction of multiple genes and their interplay with dietary and environmental factors. To date, considerable progress has been made in identifying the metabolic risk factors that predispose to this complex trait, among which hypercalciuria predominates. The specific genetic and epigenetic factors involved in urolithiasis have remained less clear, partly owing to the candidate gene and linkage methods that have been available until now, being inherently low in their power of resolution and in assessing modest effects in complex traits. However, together with investigations of rare, Mendelian forms of urolithiasis associated with various metabolic risk factors, these methods have afforded insights into biological pathways that seem to underlie the development of stones in the urinary tract. Monogenic diseases account for a greater proportion of stone formers in children and adolescents than in adults. Early diagnosis of monogenic forms of urolithiasis is of importance owing to associated renal injury and other potentially treatable disease manifestations, but diagnosis is often delayed because of a lack of familiarity with these rare disorders. In this Review, we will discuss advances in the understanding of the genetics underlying polygenic and monogenic forms of urolithiasis.
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Affiliation(s)
- Carla G Monico
- Division of Nephrology and Hypertension, Department of Internal Medicine, Mayo Clinic Hyperoxaluria Center, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
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35
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Beara-Lasic L, Edvardsson VO, Palsson R, Lieske JC, Goldfarb DS, Milliner DS. Genetic Causes of Kidney Stones and Kidney Failure. Clin Rev Bone Miner Metab 2011. [DOI: 10.1007/s12018-011-9113-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Kipp BR, Roellinger SE, Lundquist PA, Highsmith WE, Dawson DB. Development and clinical implementation of a combination deletion PCR and multiplex ligation-dependent probe amplification assay for detecting deletions involving the human α-globin gene cluster. J Mol Diagn 2011; 13:549-57. [PMID: 21708285 PMCID: PMC3157609 DOI: 10.1016/j.jmoldx.2011.04.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Revised: 03/28/2011] [Accepted: 04/11/2011] [Indexed: 11/22/2022] Open
Abstract
The α-thalassemias are a group of hereditary disorders caused by reduced synthesis of the α-chain of hemoglobin. We have developed and tested an α-thalassemia assay that uses both multiplex ligation-dependent probe amplification (MLPA) with Luminex-based detection and deletion PCR technologies. The MLPA assay consisted of 20 probes, 15 of which hybridized to the α-globin gene cluster and 5 that served as control probes. A PCR assay was developed to confirm the presence of heterozygous/homozygous 3.7-kb and 4.2-kb deletions. MLPA and PCR results were compared to Southern blot (SB) results from 758 and 133 specimens, respectively. Lastly, MLPA and PCR results were reviewed and summarized from 5386 clinically tested specimens. SB and MLPA results were concordant in 678/687 (99%) specimens. PCR detected all deletions detected by SB with no false positives. No deletions or duplications were identified in 2630 (49%) clinically tested specimens. Extra α-globin copies were identified in 76 patients. A deletion of one or two α-globin genes was identified in 1251 (23%) and 1349 (25%) specimens, respectively, including 15 different genotypes. A deletion of three (hemoglobin H) and four α-globin genes (Hb Bart's) was observed in 65 or 3 specimens, respectively. Six patients had a deletion within the α-globin regulatory region MCS-R2. Thus, MLPA plus deletion PCR identify multiple α-globin gene deletions/duplications in patients being tested for α-thalassemia.
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Affiliation(s)
| | | | | | | | - D. Brian Dawson
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
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Bergstralh EJ, Monico CG, Lieske JC, Herges RM, Langman CB, Hoppe B, Milliner DS. Transplantation outcomes in primary hyperoxaluria. Am J Transplant 2010; 10:2493-501. [PMID: 20849551 PMCID: PMC2965313 DOI: 10.1111/j.1600-6143.2010.03271.x] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Optimal transplantation strategies are uncertain in primary hyperoxaluria (PH) due to potential for recurrent oxalosis. Outcomes of different transplantation approaches were compared using life-table methods to determine kidney graft survival among 203 patients in the International Primary Hyperoxaluria Registry. From 1976-2009, 84 kidney alone (K) and combined kidney and liver (K + L) transplants were performed in 58 patients. Among 58 first kidney transplants (32 K, 26 K + L), 1-, 3- and 5-year kidney graft survival was 82%, 68% and 49%. Renal graft loss occurred in 26 first transplants due to oxalosis in ten, chronic allograft nephropathy in six, rejection in five and other causes in five. Delay in PH diagnosis until after transplant favored early graft loss (p = 0.07). K + L had better kidney graft outcomes than K with death-censored graft survival 95% versus 56% at 3 years (p = 0.011). Among 29 year 2000-09 first transplants (24 K + L), 84% were functioning at 3 years compared to 55% of earlier transplants (p = 0.05). At 6.8 years after transplantation, 46 of 58 patients are living (43 with functioning grafts). Outcomes of transplantation in PH have improved over time, with recent K + L transplantation highly successful. Recurrent oxalosis accounted for a minority of kidney graft losses.
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Affiliation(s)
- Eric J. Bergstralh
- Division of Biomedical Statistics and Informatics and the Mayo Clinic Hyperoxaluria Center, Rochester, MN, United States
| | - Carla G Monico
- Divisions of Nephrology, Departments of Pediatrics and Internal Medicine, and the Mayo Clinic Hyperoxaluria Center, Rochester, MN, United States
| | - John C. Lieske
- Divisions of Nephrology, Departments of Pediatrics and Internal Medicine, and the Mayo Clinic Hyperoxaluria Center, Rochester, MN, United States
| | - Regina M. Herges
- Division of Biomedical Statistics and Informatics and the Mayo Clinic Hyperoxaluria Center, Rochester, MN, United States
| | - Craig B. Langman
- Division of Kidney Diseases, Children's Memorial Hospital, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Bernd Hoppe
- Division of Pediatric Nephrology, Department of Pediatrics, University Hospital, Cologne, Germany
| | - Dawn S Milliner
- Divisions of Nephrology, Departments of Pediatrics and Internal Medicine, and the Mayo Clinic Hyperoxaluria Center, Rochester, MN, United States
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Lodish MB, Adams KT, Huynh TT, Prodanov T, Ling A, Chen C, Shusterman S, Jimenez C, Merino M, Hughes M, Cradic KW, Milosevic D, Singh RJ, Stratakis CA, Pacak K. Succinate dehydrogenase gene mutations are strongly associated with paraganglioma of the organ of Zuckerkandl. Endocr Relat Cancer 2010; 17:581-8. [PMID: 20418362 PMCID: PMC3417306 DOI: 10.1677/erc-10-0004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Organ of Zuckerkandl paragangliomas (PGLs) are rare neuroendocrine tumors that are derived from chromaffin cells located around the origin of the inferior mesenteric artery extending to the level of the aortic bifurcation. Mutations in the genes encoding succinate dehydrogenase subunits (SDH) B, C, and D (SDHx) have been associated with PGLs, but their contribution to PGLs of the organ of Zuckerkandl PGLs is not known. We aimed to describe the clinical presentation of patients with PGLs of the organ of Zuckerkandl and investigate the prevalence of SDHx mutations and other genetic defects among them. The clinical characteristics of 14 patients with PGL of the organ of Zuckerkandl were analyzed retrospectively; their DNA was tested for SDHx mutations and deletions. Eleven out of 14 (79%) patients with PGLs of the organ of Zuckerkandl were found to have mutations in the SDHB (9) or SDHD (2) genes; one patient was found to have the Carney-Stratakis syndrome (CSS), and his PGL was discovered during surgery for gastrointestinal stromal tumor. Our results show that SDHx mutations are prevalent in pediatric and adult PGLs of the organ of Zuckerkandl. Patients with PGLs of the organ of Zuckerkandl should be screened for SDHx mutations and the CSS; in addition, asymptomatic carriers of an SDHx mutation among the relatives of affected patients may benefit from tumor screening for early PGL detection.
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Affiliation(s)
- Maya B Lodish
- Section on Endocrinology & Genetics & Pediatric Endocrinology Program, Program on Developmental Endocrinology & Genetics (PDEGEN), National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Building 10-CRC 10 Center Drive, room 1-3330 Bethesda, MD 20892
| | - Karen T Adams
- Reproductive Biology and Adult Endocrinology Program, NICHD, NIH, Bethesda, MD, United States, 20892
| | - Thanh T Huynh
- Reproductive Biology and Adult Endocrinology Program, NICHD, NIH, Bethesda, MD, United States, 20892
| | - Tamara Prodanov
- Reproductive Biology and Adult Endocrinology Program, NICHD, NIH, Bethesda, MD, United States, 20892
| | - Alex Ling
- Department of Diagnostic Radiology, Warren Grant Magnuson Clinical Center, NIH, Bethesda, MD 20892
| | - Clara Chen
- Department of Diagnostic Radiology, Warren Grant Magnuson Clinical Center, NIH, Bethesda, MD 20892
| | - Suzanne Shusterman
- Department of Pediatric Oncology, Dana Farber Cancer Institute, Boston, MA, United States, 02115
| | - Camilo Jimenez
- The University of Texas M.D. Anderson Cancer Center, Houston, Texas, United States, 77030
| | - Maria Merino
- Department of Pathology, National Cancer Institute, NIH, Bethesda MD 20892
| | - Marybeth Hughes
- Department of Surgery, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Kendall W Cradic
- Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, MN 55905
| | - Dragana Milosevic
- Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, MN 55905
| | - Ravinder J Singh
- Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, MN 55905
| | - Constantine A Stratakis
- Section on Endocrinology & Genetics & Pediatric Endocrinology Program, Program on Developmental Endocrinology & Genetics (PDEGEN), National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Building 10-CRC 10 Center Drive, room 1-3330 Bethesda, MD 20892
| | - Karel Pacak
- Reproductive Biology and Adult Endocrinology Program, NICHD, NIH, Bethesda, MD, United States, 20892
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Leyva-Vega M, Gerfen J, Thiel BD, Jurkiewicz D, Rand EB, Pawlowska J, Kaminska D, Russo P, Gai X, Krantz ID, Kamath BM, Hakonarson H, Haber BA, Spinner NB. Genomic alterations in biliary atresia suggest region of potential disease susceptibility in 2q37.3. Am J Med Genet A 2010; 152A:886-95. [PMID: 20358598 DOI: 10.1002/ajmg.a.33332] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Biliary atresia (BA) is a progressive, idiopathic obliteration of the extrahepatic biliary system occurring exclusively in the neonatal period. It is the most common disease leading to liver transplantation in children. The etiology of BA is unknown, although infectious, immune and genetic causes have been suggested. Although the recurrence of BA in families is not common, there are more than 30 multiplex families reported and an underlying genetic susceptibility has been hypothesized. We screened a cohort of 35 BA patients for genomic alterations that might confer susceptibility to BA. DNA was genotyped on the Illumina Human Hap 550 Beadchip platform, which analyzes over 550,000 single nucleotide polymorphisms (SNPs) for genomic deletions and duplications. Areas of increased and decreased copy number were compared to those found in control populations. To identify regions that could serve as susceptibility factors for BA, we searched for regions that were found in BA patients, but not in controls. We identified two unrelated BA patients with overlapping heterozygous deletions of 2q37.3. Patient 1 had a 1.76 Mb (280 SNP), heterozygous deletion containing 30 genes. Patient 2 had a 5.87 Mb (1,346 SNP) heterozygous deletion containing 55 genes. The overlapping 1.76 Mb deletion on chromosome 2q37.3 from 240,936,900 to 242,692,820 constitutes the critical region and the genes within this region could be candidates for susceptibility to BA.
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Affiliation(s)
- Melissa Leyva-Vega
- Division of Gastroenterology, Hepatology and Nutrition, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
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Williams EL, Acquaviva C, Amoroso A, Chevalier F, Coulter-Mackie M, Monico CG, Giachino D, Owen T, Robbiano A, Salido E, Waterham H, Rumsby G. Primary hyperoxaluria type 1: update and additional mutation analysis of the AGXT gene. Hum Mutat 2009; 30:910-7. [PMID: 19479957 DOI: 10.1002/humu.21021] [Citation(s) in RCA: 127] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Primary hyperoxaluria type 1 (PH1) is an autosomal recessive, inherited disorder of glyoxylate metabolism arising from a deficiency of the alanine:glyoxylate aminotransferase (AGT) enzyme, encoded by the AGXT gene. The disease is manifested by excessive endogenous oxalate production, which leads to impaired renal function and associated morbidity. At least 146 mutations have now been described, 50 of which are newly reported here. The mutations, which occur along the length of the AGXT gene, are predominantly single-nucleotide substitutions (75%), 73 are missense, 19 nonsense, and 18 splice mutations; but 36 major and minor deletions and insertions are also included. There is little association of mutation with ethnicity, the most obvious exception being the p.Ile244Thr mutation, which appears to have North African/Spanish origins. A common, polymorphic variant encoding leucine at codon 11, the so-called minor allele, has significantly lower catalytic activity in vitro, and has a higher frequency in PH1 compared to the rest of the population. This polymorphism influences enzyme targeting in the presence of the most common Gly170Arg mutation and potentiates the effect of several other pathological sequence variants. This review discusses the spectrum of AGXT mutations and polymorphisms, their clinical significance, and their diagnostic relevance.
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Affiliation(s)
- Emma L Williams
- Clinical Biochemistry, University College London (UCL) Hospitals National Health Service (NHS) Trust, London, UK
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Abstract
The primary hyperoxalurias (PHs) are rare disorders of glyoxylate metabolism in which specific hepatic enzyme deficiencies result in overproduction of oxalate. Due to the resulting severe hyperoxaluria, recurrent urolithiasis or progressive nephrocalcinosis are principal manifestations. End stage renal failure frequently occurs and is followed by systemic oxalate deposition along with its devastating effects. Due to the lack of familiarity with PHs and their heterogeneous clinical expressions, the diagnosis is often delayed until there is advanced disease. In recent years, improvements in medical management have been associated with better patient outcomes. Although there are several therapeutic options that can help prevent early kidney failure, the only curative treatment to date is combined liver-kidney transplantation in patients with type I PH. Promising areas of investigation are being identified. Knowledge of the spectrum of disease expression, early diagnosis, and initiation of treatment before renal failure are essential to realize a benefit for patients.
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Sethi SK, Waterham HR, Sharma S, Sharma A, Hari P, Bagga A. Primary hyperoxaluria type 1 with a novel mutation. Indian J Pediatr 2009; 76:215-7. [PMID: 18810341 DOI: 10.1007/s12098-008-0187-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2007] [Accepted: 04/01/2008] [Indexed: 11/28/2022]
Abstract
Primary hyperoxaluria type 1 [PH1] is an autosomal recessive disorder caused by a deficiency of alanine-glyoxylate aminotransferase AGT, which is encoded by the AGXT gene. We report an Indian family with two affected siblings having a novel mutation in the AGXT gene inherited from the parents. The index case progressed to end stage renal disease at 5 months of age. His 4 month old sibling is presently under follow up with preserved renal function.
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Affiliation(s)
- Sidharth Kumar Sethi
- Departments of Clinical Chemistry & Pediatrics, Academic Medical Centre, Amsterdam, The Netherlands
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Abstract
The primary hyperoxalurias (PHs) are rare autosomal-recessive inborn errors of metabolism. In the most severe form (type 1), recurrent kidney stones and progressive nephrocalcinosis lead to the loss of kidney function, accompanied by systemic oxalosis, and often requires dialysis and/or transplantation. The variety of genetic mutations leading to PH increasingly are being defined, resulting in the ability to diagnose most patients accurately via minimally invasive means. During and after definitive diagnosis, supportive therapies with pyridoxine supplementation, urinary crystallization inhibitors, and hydration should be used, but have varying success. Emerging information about the renal tubular and intestinal transport of oxalate is leading to increasing evidence to support the use of oxalate-degrading bacteria (probiotics) and enzymes in the treatment of PH. Organ transplantation historically has offered the only potential cure for PH, and may include kidney-alone, combined liver-kidney, or pre-emptive liver-alone transplantation. Exciting new approaches in the treatment of type 1 PH, however, are under investigation. These include the restoration of defective enzymatic activity through the use of chemical chaperones, hepatocyte cell transplantation, or enzyme replacement by recombinant gene therapy. These novel approaches illustrate the goal for the ideal treatment of PH: correcting the genetic defect without exposing patients to the life-long risks associated with organ transplantation.
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Affiliation(s)
- Amy E Bobrowski
- Feinberg School of Medicine, Northwestern University, Chicago, IL 60614, USA
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Jungers P, Joly D, Blanchard A, Courbebaisse M, Knebelmann B, Daudon M. [Inherited monogenic kidney stone diseases: recent diagnostic and therapeutic advances]. Nephrol Ther 2008; 4:231-55. [PMID: 18499551 DOI: 10.1016/j.nephro.2007.12.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2007] [Accepted: 12/20/2007] [Indexed: 11/24/2022]
Abstract
Hereditary monogenic kidney stone diseases are rare diseases, since they account for nearly 2% of nephrolithiasis cases in adults and 10% in children. Most of them are severe, because they frequently are associated with nephrocalcinosis and lead to progressive impairment of renal function unless an early and appropriate etiologic treatment is instituted. Unfortunately, treatment is often lacking or started too late since they are often misdiagnosed or overlooked. The present review reports the genotypic and phenotypic characteristics of monogenic nephrolithiases, with special emphasis on the recent advances in the field of diagnosis and therapeutics. Monogenic stone diseases will be classified into three groups according to their mechanism: (1) inborn errors of the metabolism of oxalate (primary hyperoxalurias), uric acid (hereditary hyperuricemias) or other purines (2,8-dihydroxyadeninuria), which, in addition to stone formation, result in crystal deposition in the renal parenchyma; (2) congenital tubulopathies affecting the convoluted proximal tubule (such as Dent's disease, Lowe syndrome or hypophosphatemic rickets), the thick ascending limb of Henlé's loop (such as familial hypomagnesemia and Bartter's syndromes) or the distal past of the nephron (congenital distal tubular acidosis with or without hearing loss), which are frequently associated with nephrocalcinosis, phosphatic stones and extensive tubulointerstitial fibrosis; (3) cystinuria, an isolated defect in tubular reabsorption of cystine and dibasic aminoacids, which results only in the formation of stones but requires a cumbersome treatment. Analysis of stones appears of crucial value for the early diagnosis of these diseases, as in several of them the morphology and composition of stones is specific. In other cases, especially if nephrocalcinosis, phosphatic stones or proteinuria are present, the evaluation of blood and urine chemistry, especially with regard to calcium, phosphate and magnesium, is the key of diagnosis. Search for mutations is now increasingly performed in as much as genetic counselling is important for the detection of heterozygotes in autosomic recessive diseases and of carrier women in X-linked diseases. In conclusion, better awareness to the rare monogenic forms of nephrolithiasis and/or nephrocalcinosis should allow early diagnosis and treatment which are needed to prevent or substantially delay progression of end-stage renal disease. Analysis of every first stone both in children and in adults should never be neglected, in order to early detect unusual forms of nephrolithiasis requiring laboratory evaluation and deep etiologic treatment.
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Affiliation(s)
- Paul Jungers
- Service de Néphrologie, Hôpital Necker, AP-HP, Paris Cedex, France
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Joshi VA, Mancini-DiNardo D, Funke BH. Selection of a platform for mutation detection. ACTA ACUST UNITED AC 2008; Chapter 7:Unit 7.15. [PMID: 18428425 DOI: 10.1002/0471142905.hg0715s56] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
New mutation detection technologies must keep pace by becoming more cost-effective while offering improved technical sensitivity and higher throughput capacity. In recent years, the number of mutation detection platforms available to the clinical researcher has grown to a point where it is difficult to keep track of all available options as well as their benefits and pitfalls. This unit provides an entry point for a variety of researchers who wish to analyze samples for known or novel mutations and need to determine which platform is most suited for their particular needs. A practical guide is provided in this unit, including a brief overview, information on assay parameters, design and cost considerations, as well as platform flexibility and scalability of the assay. Although the focus here is on applications involving human disease, many of these platforms can be easily adapted to the study of other organisms.
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Affiliation(s)
- Victoria A Joshi
- Harvard Medical School-Partners Healthcare Center for Genetics and Genomics, Cambridge, Massachusetts, USA
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Coulter-Mackie MB, Lian Q, Applegarth DA, Toone J, Waters PJ, Vallance H. Mutation-based diagnostic testing for primary hyperoxaluria type 1: survey of results. Clin Biochem 2008; 41:598-602. [PMID: 18282470 DOI: 10.1016/j.clinbiochem.2008.01.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2007] [Revised: 01/17/2008] [Accepted: 01/18/2008] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To test for specific mutations in the alanine:glyoxylate aminotransferase (AGT) gene, in order to diagnose primary hyperoxaluria type 1 (PH1). DESIGN AND METHODS Samples of liver and/or DNA from 81 patients were submitted to our laboratory for diagnostic testing for PH1. Using a panel of selected mutations, DNA was examined in 64 cases, of which 36 had the diagnosis of PH1 confirmed by liver AGT assay. DNA sequencing was employed if mutation testing revealed only one mutation. RESULTS Identification of 100% of the mutations in the AGT-confirmed samples led to the development of a focused testing panel currently involving 4 common mutations, 7 mutations recurring at lower frequency and 5 with apparent ethnic associations. CONCLUSIONS This mutation panel alone would have identified the two causative mutations in 64% of the PH1 samples.
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