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Szegedi K, Szabó Z, Kállai J, Király J, Szabó E, Bereczky Z, Juhász É, Dezső B, Szász C, Zsebik B, Flaskó T, Halmos G. Potential Role of VHL, PTEN, and BAP1 Mutations in Renal Tumors. J Clin Med 2023; 12:4538. [PMID: 37445575 DOI: 10.3390/jcm12134538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 07/04/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023] Open
Abstract
The genetic profiling of renal tumors has revealed genomic regions commonly affected by structural changes and a general genetic heterogeneity. The VHL, PTEN, and BAP1 genes are often mutated in renal tumors. The frequency and clinical relevance of these mutations in renal tumors are still being researched. In our study, we investigated VHL, PTEN, and BAP1 genes and the sequencing of 24 samples of patients with renal tumors, revealing that VHL was mutated at a noticeable frequency (25%). Six of the investigated samples showed mutations, and one genetic polymorphism (rs779805) was detected in both heterozygote and homozygote forms. PTEN gene mutation was observed in only one sample, and one specimen showed genetic polymorphism. In the case of the BAP1 gene, all of the samples were wild types. Interestingly, VHL mutation was detected in two female patients diagnosed with AML and in one with oncocytoma. We assume that VHL or PTEN mutations may contribute to the development of human renal cancer. However, the overall mutation rate was low in all specimens investigated, and the development and prognosis of the disease were not exclusively associated with these types of genetic alterations.
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Affiliation(s)
- Krisztián Szegedi
- Department of Urology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
- Doctoral School of Pharmaceutical Sciences, University of Debrecen, 4032 Debrecen, Hungary
| | - Zsuzsanna Szabó
- Department of Biopharmacy, Faculty of Pharmacy, University of Debrecen, 4032 Debrecen, Hungary
| | - Judit Kállai
- Division of Clinical Laboratory Science, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - József Király
- Department of Biopharmacy, Faculty of Pharmacy, University of Debrecen, 4032 Debrecen, Hungary
| | - Erzsébet Szabó
- Department of Biopharmacy, Faculty of Pharmacy, University of Debrecen, 4032 Debrecen, Hungary
| | - Zsuzsanna Bereczky
- Division of Clinical Laboratory Science, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Éva Juhász
- Department of Pediatrics, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Balázs Dezső
- Department of Pathology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
- Department of Oral Pathology and Microbiology, Faculty of Dentistry, University of Debrecen, 4032 Debrecen, Hungary
| | - Csaba Szász
- Department of Pathology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Barbara Zsebik
- Department of Biopharmacy, Faculty of Pharmacy, University of Debrecen, 4032 Debrecen, Hungary
| | - Tibor Flaskó
- Department of Urology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Gábor Halmos
- Department of Biopharmacy, Faculty of Pharmacy, University of Debrecen, 4032 Debrecen, Hungary
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Mathó C, Fernández MC, Bonanata J, Liu XD, Martin A, Vieites A, Sansó G, Barontini M, Jonasch E, Coitiño EL, Pennisi PA. VHL-P138R and VHL-L163R Novel Variants: Mechanisms of VHL Pathogenicity Involving HIF-Dependent and HIF-Independent Actions. Front Endocrinol (Lausanne) 2022; 13:854365. [PMID: 35388293 PMCID: PMC8978939 DOI: 10.3389/fendo.2022.854365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 02/15/2022] [Indexed: 11/21/2022] Open
Abstract
The von Hippel-Lindau (VHL) disease is an autosomal dominant cancer syndrome caused by mutations in the VHL tumor suppressor gene. VHL protein (pVHL) forms a complex (VBC) with Elongins B-C, Cullin2, and Rbx1. Although other functions have been discovered, the most described function of pVHL is to recognize and target hypoxia-inducible factor (HIF) for degradation. This work comprises the functional characterization of two novel variants of the VHL gene (P138R and L163R) that have been described in our center in patients with VHL disease by in vitro, in vivo, and in silico approaches. In vitro, we found that these variants have a significantly shorter half-life compared to wild-type VHL but still form a functional VBC complex. Altered fibronectin deposition was evidenced for both variants using immunofluorescence. In vivo studies revealed that both variants failed to suppress tumor growth. By means of molecular dynamics simulations, we inspected in silico the nature of the changes introduced by each variant in the VBC complex. We have demonstrated the pathogenicity of P138R and L163R novel variants, involving HIF-dependent and HIF-independent mechanisms. These results provide the basis for future studies regarding the impact of structural alterations on posttranslational modifications that drive pVHL's fate and functions.
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Affiliation(s)
- Cecilia Mathó
- Centro de Investigaciones Endocrinológicas Dr. César Bergadá (CEDIE), Consejo Nacional de Investigaciones Científicas y Técnicas- Fundación de Endocrinología Infantil (CONICET-FEI) División de Endocrinología, Hospital de Niños Dr. Ricardo Gutiérrez, Buenos Aires, Argentina
| | - María Celia Fernández
- Centro de Investigaciones Endocrinológicas Dr. César Bergadá (CEDIE), Consejo Nacional de Investigaciones Científicas y Técnicas- Fundación de Endocrinología Infantil (CONICET-FEI) División de Endocrinología, Hospital de Niños Dr. Ricardo Gutiérrez, Buenos Aires, Argentina
| | - Jenner Bonanata
- Laboratorio de Química Teórica y Computacional (LQTC), Instituto de Química Biológica, Facultad de Ciencias and Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay
| | - Xian-De Liu
- University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - Ayelen Martin
- Centro de Investigaciones Endocrinológicas Dr. César Bergadá (CEDIE), Consejo Nacional de Investigaciones Científicas y Técnicas- Fundación de Endocrinología Infantil (CONICET-FEI) División de Endocrinología, Hospital de Niños Dr. Ricardo Gutiérrez, Buenos Aires, Argentina
| | - Ana Vieites
- Centro de Investigaciones Endocrinológicas Dr. César Bergadá (CEDIE), Consejo Nacional de Investigaciones Científicas y Técnicas- Fundación de Endocrinología Infantil (CONICET-FEI) División de Endocrinología, Hospital de Niños Dr. Ricardo Gutiérrez, Buenos Aires, Argentina
| | - Gabriela Sansó
- Centro de Investigaciones Endocrinológicas Dr. César Bergadá (CEDIE), Consejo Nacional de Investigaciones Científicas y Técnicas- Fundación de Endocrinología Infantil (CONICET-FEI) División de Endocrinología, Hospital de Niños Dr. Ricardo Gutiérrez, Buenos Aires, Argentina
| | - Marta Barontini
- Centro de Investigaciones Endocrinológicas Dr. César Bergadá (CEDIE), Consejo Nacional de Investigaciones Científicas y Técnicas- Fundación de Endocrinología Infantil (CONICET-FEI) División de Endocrinología, Hospital de Niños Dr. Ricardo Gutiérrez, Buenos Aires, Argentina
| | - Eric Jonasch
- University of Texas MD Anderson Cancer Center, Houston, TX, United States
| | - E. Laura Coitiño
- Laboratorio de Química Teórica y Computacional (LQTC), Instituto de Química Biológica, Facultad de Ciencias and Centro de Investigaciones Biomédicas (CEINBIO), Universidad de la República, Montevideo, Uruguay
| | - Patricia Alejandra Pennisi
- Centro de Investigaciones Endocrinológicas Dr. César Bergadá (CEDIE), Consejo Nacional de Investigaciones Científicas y Técnicas- Fundación de Endocrinología Infantil (CONICET-FEI) División de Endocrinología, Hospital de Niños Dr. Ricardo Gutiérrez, Buenos Aires, Argentina
- *Correspondence: Patricia Alejandra Pennisi,
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Kumar PS, Venkatesh K, Sowjenya G, Srikanth L, Sunitha MM, Prasad UV, Swarupa V, Yeswanth S, Naveen PSR, Sridhar A, Kumar VS, Sarma PVGK. Mutations in exons 3 and 7 resulting in truncated expression of human ATP6V1B1 gene showing structural variations contributing to poor substrate binding-causative reason for distal renal tubular acidosis with sensorineural deafness. J Biomol Struct Dyn 2015; 33:2094-103. [PMID: 25517796 DOI: 10.1080/07391102.2014.999704] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Distal renal tubular acidosis (dRTA) is an autosomal recessive syndrome results defect in either proximal tubule bicarbonate reabsorption or in distal tubule H(+) secretion and is characterized by severe hyperchloraemic metabolic acidosis in childhood. dRTA is associated with functional variations in the ATP6V1B1 gene encoding β1 subunit of H(+)-ATPase, key membrane transporters for net acid excretion of α-intercalated cells of medullary collecting ducts. In the present study, a 13-year-old male patient suffering with nephropathy and sensorineural deafness was reported in the Department of Nephrology. We predicted improper functioning of ATP6V1B1 gene could be the reason for diseased condition. Therefore, exons 3, 4, and 7 contributing active site of ATP6V1B1 gene was amplified and sequenced (Accession numbers: KF571726, KM222653). The obtained sequences were BLAST searched against the wild type ATP6V1B1 gene which showed novel mutations c.307 A > G, c.308 C > A, c.310 C > G, c.704 T > C, c.705 G > T, c.709 A > G, c.710 A > G, c.714 G > A, c.716 C > A, c.717delC, c.722 C > G, c.728insG, c.741insT, c.753G > C. These mutations resulted in the expression of truncated protein terminating at Lys 209. The mutated ATP6V1B1structure superimposed with wild type showed extensive variations with RMSD 1.336 Å and could not bind to substrate ADP leading to non-functional ATPase. These results conclusively explain these mutations in ATP6V1B1 gene resulted in structural changes causing accumulation of H(+) ions contributing to dRTA with sensorineural deafness.
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Affiliation(s)
- Pasupuleti Santhosh Kumar
- a Department of Biotechnology , Sri Venkateswara Institute of Medical Sciences , Tirupati , AP 517507 , India
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Pasupuleti SK, Katari V, Lokanathan S, Uppu VP, Thummaginjala SS, Akkamgari RPR, Ayapati T, Kottu R, Potukuchi VGKS. Novel frame shift mutations (‘A’ deletion) observed in exon 9 of Wilms' tumor (WT1) gene in a patient reported with glomerulosclerosis. Gene 2014; 546:63-7. [DOI: 10.1016/j.gene.2014.05.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2013] [Revised: 04/25/2014] [Accepted: 05/16/2014] [Indexed: 10/25/2022]
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