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Buerger F, Salmanullah D, Liang L, Gauntner V, Krueger K, Qi M, Sharma V, Rubin A, Ball D, Lemberg K, Saida K, Merz LM, Sever S, Issac B, Sun L, Guerrero-Castillo S, Gomez AC, McNulty MT, Sampson MG, Al-Hamed MH, Saleh MM, Shalaby M, Kari J, Fawcett JP, Hildebrandt F, Majmundar AJ. Recessive variants in the intergenic NOS1AP-C1orf226 locus cause monogenic kidney disease responsive to anti-proteinuric treatment. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2024:2024.03.17.24303374. [PMID: 38562757 PMCID: PMC10984069 DOI: 10.1101/2024.03.17.24303374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
In genetic disease, an accurate expression landscape of disease genes and faithful animal models will enable precise genetic diagnoses and therapeutic discoveries, respectively. We previously discovered that variants in NOS1AP , encoding nitric oxide synthase 1 (NOS1) adaptor protein, cause monogenic nephrotic syndrome (NS). Here, we determined that an intergenic splice product of N OS1AP / Nos1ap and neighboring C1orf226/Gm7694 , which precludes NOS1 binding, is the predominant isoform in mammalian kidney transcriptional and proteomic data. Gm7694 -/- mice, whose allele exclusively disrupts the intergenic product, developed NS phenotypes. In two human NS subjects, we identified causative NOS1AP splice variants, including one predicted to abrogate intergenic splicing but initially misclassified as benign based on the canonical transcript. Finally, by modifying genetic background, we generated a faithful mouse model of NOS1AP -associated NS, which responded to anti-proteinuric treatment. This study highlights the importance of intergenic splicing and a potential treatment avenue in a mendelian disorder.
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Xiao M, Bohnert BN, Grahammer F, Artunc F. Rodent models to study sodium retention in experimental nephrotic syndrome. Acta Physiol (Oxf) 2022; 235:e13844. [PMID: 35569011 DOI: 10.1111/apha.13844] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 05/02/2022] [Accepted: 05/10/2022] [Indexed: 12/12/2022]
Abstract
Sodium retention and edema are hallmarks of nephrotic syndrome (NS). Different experimental rodent models have been established for simulating NS, however, not all of them feature sodium retention which requires proteinuria to exceed a certain threshold. In rats, puromycin aminonucleoside nephrosis (PAN) is a classic NS model introduced in 1955 that was adopted as doxorubicin-induced nephropathy (DIN) in 129S1/SvImJ mice. In recent years, mice with inducible podocin deletion (Nphs2Δipod ) or podocyte apoptosis (POD-ATTAC) have been developed. In these models, sodium retention is thought to be caused by activation of the epithelial sodium channel (ENaC) in the distal nephron through aberrantly filtered serine proteases or proteasuria. Strikingly, rodent NS models follow an identical chronological time course after the development of proteinuria featuring sodium retention within days and spontaneous reversal thereafter. In DIN and Nphs2Δipod mice, inhibition of ENaC by amiloride or urinary serine protease activity by aprotinin prevents sodium retention, opening up new and promising therapeutic approaches that could be translated into the treatment of nephrotic patients. However, the essential serine protease(s) responsible for ENaC activation is (are) still unknown. With the use of nephrotic rodent models, there is the possibility that this (these) will be identified in the future. This review summarizes the various rodent models used to study experimental nephrotic syndrome and the insights gained from these models with regard to the pathophysiology of sodium retention.
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Affiliation(s)
- Mengyun Xiao
- Division of Endocrinology, Diabetology and Nephrology, Department of Internal Medicine University Hospital Tübingen Tübingen Germany
| | - Bernhard N. Bohnert
- Division of Endocrinology, Diabetology and Nephrology, Department of Internal Medicine University Hospital Tübingen Tübingen Germany
- Institute of Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University Tübingen Tübingen Germany
- German Center for Diabetes Research (DZD) at the University Tübingen Tübingen Germany
| | - Florian Grahammer
- III. Department of Medicine University Medical Center Hamburg‐Eppendorf Hamburg Germany
| | - Ferruh Artunc
- Division of Endocrinology, Diabetology and Nephrology, Department of Internal Medicine University Hospital Tübingen Tübingen Germany
- Institute of Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University Tübingen Tübingen Germany
- German Center for Diabetes Research (DZD) at the University Tübingen Tübingen Germany
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Tran TT, Linga VG, Al-Obaide MAI, Bello-Germino D, Hoda M, Adesanya O, Vasylyeva TL. Congenital nephrotic syndrome in a Hispanic Guatemalan newborn associated with a NPHS1 variant: A case report. Biomed Rep 2021; 16:4. [PMID: 34900253 PMCID: PMC8652645 DOI: 10.3892/br.2021.1487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 11/05/2021] [Indexed: 11/06/2022] Open
Abstract
Congenital nephrotic syndrome (CNS) is an autosomal recessive disorder usually detected in the first 3 months of life when the syndromes effects manifest, including edema and a failure to gain weight. A baby boy was admitted to the Neonatal Intensive Care Unit for prematurity (35 weeks) with unremarkable maternal prenatal laboratory tests. The patient had persistent systemic hypertension, hypoproteinemia, hypoalbuminemia and nephrotic range proteinuria. CNS was diagnosed, and genetic testing showed a homozygous variant, c.3024A>G (AGA>AGG) in exon 22 of the nephrin locus. Bioinformatics analysis suggested the genetic condition was likely a result of malfunctional DNA binding sites of transcription factors FOXL1 and FOXC1.
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Affiliation(s)
- Thu T Tran
- Department of Pediatrics, Texas Tech University Health Sciences Center, Amarillo, TX 79106, USA
| | - Vijay G Linga
- Department of Pediatrics, Texas Tech University Health Sciences Center, Amarillo, TX 79106, USA
| | - Mohammed A I Al-Obaide
- Department of Pediatrics, Texas Tech University Health Sciences Center, Amarillo, TX 79106, USA
| | - Daniella Bello-Germino
- Department of Pediatrics, Texas Tech University Health Sciences Center, Amarillo, TX 79106, USA
| | - Mehar Hoda
- Department of Pediatrics, Texas Tech University Health Sciences Center, Amarillo, TX 79106, USA
| | - Olubukunola Adesanya
- Department of Pediatrics, Texas Tech University Health Sciences Center, Amarillo, TX 79106, USA
| | - Tetyana L Vasylyeva
- Department of Pediatrics, Texas Tech University Health Sciences Center, Amarillo, TX 79106, USA
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Gu Y, Han B, Zhu X, Chen Y. Prenatal diagnosis of congenital nephrotic syndrome of the Finnish type in a Chinese family. Taiwan J Obstet Gynecol 2021; 60:758-762. [PMID: 34247820 DOI: 10.1016/j.tjog.2021.05.030] [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] [Accepted: 04/28/2021] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE To explore the genetic bias in a Chinese family suspected of having congenital nephrotic syndrome of the Finnish type (CNF). CASE REPORT We developed a prenatal genetic diagnosis in a Chinese family with CNF. A single heterozygous mutation (c.3213delG) was found in the foetus IId and we presumed that it was an asymptomatic carrier of the normal phenotype. Additionally, two compound heterozygous variants (c.3213delG and c.3478C > T) were discovered in the foetus IIe, which were inherited from the mother and father, respectively. We performed further pathological examinations after medical abortion. Kidney histopathology and immunofluorescence results were similar to those reported in previous studies. CONCLUSION Prenatal genetic diagnosis of CNF still requires further research to explore the pathogenicity of suspected mutations.
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Affiliation(s)
- Yuling Gu
- First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Bing Han
- First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China.
| | - Xiaolan Zhu
- First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Youguo Chen
- First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
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Reynolds BC, Oswald RJA. Diagnostic and Management Challenges in Congenital Nephrotic Syndrome. PEDIATRIC HEALTH MEDICINE AND THERAPEUTICS 2019; 10:157-167. [PMID: 31908565 PMCID: PMC6930517 DOI: 10.2147/phmt.s193684] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 12/05/2019] [Indexed: 12/21/2022]
Abstract
Congenital Nephrotic Syndrome (CNS) is defined as nephrotic range proteinuria, hypoalbuminaemia and edema in the first three months of life. CNS is most commonly genetic in cause, with international variance in the incidence of causative mutations. Initially defined by the histopathological appearance, increasingly sophisticated and accessible genetic analyses now provide a body of evidence to suggest that there is a disparity between the histological appearance, the genotype of individuals and the severity of the clinical disease. Through the evolution of management approaches CNS has changed from being an invariably fatal condition to one with appreciable ongoing morbidity and mortality but comparably good outcomes to other causes of paediatric end-stage renal disease, especially following transplantation. This review briefly summarises the more commonly recognised genetic mutations leading to CNS, addresses common management decisions, and concludes with potential therapies for the future.
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Grover SB, Kumar N, Grover H, Taneja DK, Katyan A. Sonographic Diagnosis in a Rare Aetiology of Neonatal Scrotal Swellings: A Case Report of Congenital Nephrotic Syndrome. Pol J Radiol 2016; 81:465-468. [PMID: 27757175 PMCID: PMC5045919 DOI: 10.12659/pjr.898088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 03/13/2016] [Indexed: 02/05/2023] Open
Abstract
Background Common etiologies of scrotal swelling in neonates include hydrocoele, inguinal hernia and testicular torsion; less common is epididymo-orchitis. Congenital nephrotic syndrome (CNS), a rare entity, is known to present as progressive renal failure and its leading presentation with scrotal involvement has not been reported. Material/Methods We report a rare case of CNS with primary clinical presentation as scrotal cellulitis and epididymo-orchitis. In this neonate, scrotal and abdominal ultrasound examination was performed and the laboratory data were obtained. Results Sonography revealed bilaterally enlarged echogenic kidneys, testis and epididymis with echogenic peritoneal fluid tracking into both scrotal sacs. Laboratory data revealed proteinuria and severe depletion of serum IgG. Culture of the peritoneal fluid showed gram-negative organisms. A final diagnosis of CNS, complicated with peritonitis tracking into the scrotal sacs was arrived at. Conclusions CNS may have a rare presentation with distracting symptoms of scrotal cellulitis and epididymo-orchitis, as seen in our patient. However, diligent use of abdomino-scrotal sonography, supported by relevant laboratory data can clinch the accurate diagnosis.
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Affiliation(s)
- Shabnam Bhandari Grover
- Department of Radiology and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Nishith Kumar
- Department of Radiology and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Hemal Grover
- At time of study: Radiology Resident Deputed to Department of Radiology, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, from Institute of Nuclear Medicine and Allied Sciences, Delhi, India, currently, Research Associate Department of Neuro Radiology, New York Medical University, New York, NY, U.S.A
| | - Dinesh Kumar Taneja
- Department of Radiology and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Amit Katyan
- Department of Radiology and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
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