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Genetic Basis of the Epidemiological Features and Clinical Significance of Renal Hypouricemia. Biomedicines 2022; 10:biomedicines10071696. [PMID: 35885001 PMCID: PMC9313227 DOI: 10.3390/biomedicines10071696] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/08/2022] [Accepted: 07/11/2022] [Indexed: 11/17/2022] Open
Abstract
A genetic defect in urate transporter 1 (URAT1) is the major cause of renal hypouricemia (RHUC). Although RHUC is detected using a serum uric acid (UA) concentration <2.0 mg/dL, the relationship between the genetic state of URAT1 and serum UA concentration is not clear. Homozygosity and compound heterozygosity with respect to mutant URAT1 alleles are associated with a serum UA concentration of <1.0 mg/dL and are present at a prevalence of ~0.1% in Japan. In heterozygous individuals, the prevalence of a serum UA of 1.1−2.0 mg/dL is much higher in women than in men. The frequency of mutant URAT1 alleles is as high as 3% in the general Japanese population. The expansion of a specific mutant URAT1 allele derived from a single mutant gene that occurred in ancient times is reflected in modern Japan at a high frequency. Similar findings were reported in Roma populations in Europe. These phenomena are thought to reflect the ancient migration history of each ethnic group (founder effects). Exercise-induced acute kidney injury (EI-AKI) is mostly observed in individuals with homozygous/compound heterozygous URAT1 mutation, and laboratory experiments suggested that a high UA load on the renal tubules is a plausible mechanism for EI-AKI.
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Miyauchi T, Terashita M, Ogata M, Murata M, Osako K, Imai N, Sakurai Y, Sasaki H, Ohashi Y, Ichida K, Shibagaki Y, Yazawa M. Renal hypouricemia in a recipient of living-donor kidney transplantation: a case report and literature review. CEN Case Rep 2022; 11:177-183. [PMID: 34554426 PMCID: PMC9061930 DOI: 10.1007/s13730-021-00647-1] [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] [Received: 06/24/2021] [Accepted: 09/15/2021] [Indexed: 11/29/2022] Open
Abstract
Hypouricemia in kidney transplant (KT) recipients is rare since they usually have subnormal kidney function which raises serum uric acid level. Recently, interests in pathogenesis of hypouricemia have been increasing due to the understanding of the role of uric acid transporter in renal hypouricemia (RHUC). We herein report the case of RHUC consequently developed in a KT recipient from a living donor with RHUC diagnosed by the detailed urinary and genetic test. A 73-year-old Japanese man underwent KT, and the donor was his wife who had hypouricemia [serum uric acid (S-UA) 0.6 mg/dL]. Nine months after KT, the recipient's S-UA was low (1.5 mg/dL) with serum creatinine (S-Cr) of 1.56 mg/dL, and fractional excretion of UA (FEUA) was high (59.7%; normal < 10%), indicating RHUC. Regarding the donor's information, S-Cr, S-UA, and FEUA were 0.95 mg/dL, 1.0 mg/dL, and 54.5%, respectively. To investigate further on the pathogenesis of RHUC in both the recipient and the donor, we performed genetic tests. The donor had a homozygous mutation of W258X in the SLC22A12 gene and the recipient had a wild type of W258X. Finally, we reviewed the previous literature on RHUC among KT recipients and discussed the strategy of follow-up for these patients.
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Affiliation(s)
- Takamasa Miyauchi
- Department of Internal Medicine, Division of Nephrology and Hypertension, St. Marianna University School of Medicine, Kawasaki, Japan
- Division of Internal Medicine, Hattori Clinic, Tokyo, Japan
| | - Maho Terashita
- Department of Internal Medicine, Division of Nephrology and Hypertension, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Masatomo Ogata
- Department of Internal Medicine, Division of Nephrology and Hypertension, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Marie Murata
- Department of Internal Medicine, Division of Nephrology and Hypertension, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Kiyomi Osako
- Department of Internal Medicine, Division of Nephrology and Hypertension, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Naohiko Imai
- Department of Internal Medicine, Division of Nephrology and Hypertension, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Yuko Sakurai
- Department of Pharmacy, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Hideo Sasaki
- Department of Urology, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Yuki Ohashi
- Department of Pathophysiology, Tokyo University of Pharmacy and Life Science, Tokyo, Japan
| | - Kimiyoshi Ichida
- Department of Pathophysiology, Tokyo University of Pharmacy and Life Science, Tokyo, Japan
| | - Yugo Shibagaki
- Department of Internal Medicine, Division of Nephrology and Hypertension, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Masahiko Yazawa
- Department of Internal Medicine, Division of Nephrology and Hypertension, St. Marianna University School of Medicine, Kawasaki, Japan
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Shearya F, Algethamy M, Ahmed S, Algehany W, Alshahrani M, Shaheen F. Urolithiasis in a Deceased Donor Kidney Transplant Recipient: Case Report. EXP CLIN TRANSPLANT 2021; 19:1341-1344. [PMID: 34951351 DOI: 10.6002/ect.2021.0329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Urolithiasis is a rare complication among kidney transplant recipients, with an incidence of 0.4% to 4.4%. Saudi Arabia has a very hot environment for most of the year, which has been linked to an increased incidence of nephrolithiasis. Additionally, animal protein consumption promotes stone development. Saudi Arabia has 2.5 times the number of stone formation indications as the rest of the world. Several features of urolithiasis and stone composition have already been discussed. The most frequent stone composition is calcium oxalate, followed by uric acid. We discuss the case of a 35-year-old Indian male brain death donor who presented after an automobile accident and had no history of chronic illness. One of his kidneys was transplanted into a female patient. She complained with flank pain and dysuria numerous times after transplant, which turned out to be a urinal track infection. She thereafter developed hematuria with burning micturition, and tests revealed that she had a large renal bladder stone as well as several pelvic kidney stones. The patient received lithotripsy and the stone was removed, and her kidney function was restored.
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Affiliation(s)
- Fouad Shearya
- From the Department of Nephrology, Jeddah Kidney Center, Kingdom of Saudi Arabia
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Tsuji K, Kitamura M, Muta K, Mochizuki Y, Mori T, Sohara E, Uchida S, Sakai H, Mukae H, Nishino T. Transplantation of a kidney with a heterozygous mutation in the SLC22A12 (URAT1) gene causing renal hypouricemia: a case report. BMC Nephrol 2020; 21:282. [PMID: 32677916 PMCID: PMC7364597 DOI: 10.1186/s12882-020-01940-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 07/08/2020] [Indexed: 11/10/2022] Open
Abstract
Background Renal hypouricemia (RHUC) is a genetic disorder caused by mutations in the SLC22A12 gene, which encodes the major uric acid (UA) transporter, URAT1. The clinical course of related, living donor-derived RHUC in patients undergoing kidney transplantation is poorly understood. Here, we report a case of kidney transplantation from a living relative who had an SLC22A12 mutation. After the transplantation, the recipient’s fractional excretion of UA (FEUA) decreased, and chimeric tubular epithelium was observed. Case presentation A 40-year-old man underwent kidney transplantation. His sister was the kidney donor. Three weeks after the transplantation, he had low serum-UA, 148.7 μmol/L, and elevated FEUA, 20.8% (normal: < 10%). The patient’s sister had low serum-UA (101.1 μmol/L) and high FEUA (15.8%) before transplant. Suspecting RHUC, we performed next-generation sequencing on a gene panel containing RHUC-associated genes. A heterozygous missense mutation in the SLC22A12 gene was detected in the donor, but not in the recipient. The recipient’s serum-UA level increased from 148.7 μmol/L to 231.9 μmol/L 3 months after transplantation and was 226.0 μmol/L 1 year after transplantation. His FEUA decreased from 20.8 to 11.7% 3 months after transplantation and was 12.4% 1 year after transplantation. Fluorescence in situ hybridization of allograft biopsies performed 3 months and 1 year after transplantation showed the presence of Y chromosomes in the tubular epithelial cells, suggesting the recipient’s elevated serum-UA levels were owing to a chimeric tubular epithelium. Conclusions We reported on a kidney transplant recipient that developed RHUC owing to his donor possessing a heterozygous mutation in the SLC22A12 (URAT1) gene. Despite this mutation, the clinical course was not problematic. Thus, the presence of donor-recipient chimerism in the tubular epithelium might positively affect the clinical course, at least in the short-term.
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Affiliation(s)
- Kiyokazu Tsuji
- Department of Nephrology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Mineaki Kitamura
- Department of Nephrology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
| | - Kumiko Muta
- Department of Nephrology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Yasushi Mochizuki
- Department of Urology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Takayasu Mori
- Department of Nephrology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Eisei Sohara
- Department of Nephrology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Shinichi Uchida
- Department of Nephrology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hideki Sakai
- Department of Urology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Hiroshi Mukae
- Department of Respiratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Tomoya Nishino
- Department of Nephrology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
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Teng L, Zhang Y, Ye L, Lv J, Mao Y, Schneider R, Chen J, Jiang H, Wu J. Donor-derived hypouricemia in irrelevant recipients caused by kidney transplantation. ANNALS OF TRANSLATIONAL MEDICINE 2020; 8:330. [PMID: 32355774 PMCID: PMC7186701 DOI: 10.21037/atm.2020.02.140] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Background Hereditary renal hypouricemia (HRH) is a genetically heterogenetic disease. Patients with HRH are almost asymptomatic; but some may experience exercise-induced acute kidney injury (EAKI) and nephrolithiasis which may bring concerns regarding the risk-benefit ratio as marginal kidney donors. This study examined the pathogenic mutations of hypouricemia in two recipients after receiving kidney transplantation, providing preliminary evidence for the mechanism of hypouricemia. Methods Two participants underwent detailed biochemical examinations. DNA and RNA were extracted from transplant specimens for sequencing. The whole-genome sequencing and polymerase chain reaction (PCR) amplification were performed to confirm the pathogenic genes. Functional effects of mutant proteins were verified by bioinformatics analysis. RNA-sequencing (RNA-seq) was used to study the transcriptome of hypouricemia. Results Both of the recipients had the low serum uric acid (UA) (45–65 µmol/l), high fraction excretion of UA (44% and 75%) and an increase in the UA clearance (35.9 and 73.3 mL/min) with a functioning graft. The sequencing analyses revealed 7 kinds of potential mutational genes in this case, two novel mutations p.R89H and p.L181V in SLC22A12 gene which were revealed by bioinformatics could be pathogenic in nature. Conclusions Two novel mutations of SLC22A12 were identified. Preliminary functional analysis revealed a potential deleterious effect of these mutations in the grafts derived from the donor and sequencing analysis expand the molecular mechanisms of renal hypouricemia.
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Affiliation(s)
- Lisha Teng
- Department of the Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.,Key Laboratory of Kidney Disease Prevention and Control Technology, Hangzhou 310003, China.,The Third-Grade Laboratory under the National State, Administration of Traditional Chinese Medicine, Hangzhou 310000, China
| | - Yanling Zhang
- Department of the Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.,Key Laboratory of Kidney Disease Prevention and Control Technology, Hangzhou 310003, China.,The Third-Grade Laboratory under the National State, Administration of Traditional Chinese Medicine, Hangzhou 310000, China.,Department of Nephrology, The Second Hospital of Shaoxing, Shaoxing 312000, China
| | - Luxi Ye
- Department of the Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.,Key Laboratory of Kidney Disease Prevention and Control Technology, Hangzhou 310003, China.,The Third-Grade Laboratory under the National State, Administration of Traditional Chinese Medicine, Hangzhou 310000, China
| | - Junhao Lv
- Department of the Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.,Key Laboratory of Kidney Disease Prevention and Control Technology, Hangzhou 310003, China.,The Third-Grade Laboratory under the National State, Administration of Traditional Chinese Medicine, Hangzhou 310000, China
| | - Youying Mao
- Nephrology Department, Shanghai Children's Medical Center, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Ronen Schneider
- Division of Nephrology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Jianghua Chen
- Department of the Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.,Key Laboratory of Kidney Disease Prevention and Control Technology, Hangzhou 310003, China.,The Third-Grade Laboratory under the National State, Administration of Traditional Chinese Medicine, Hangzhou 310000, China
| | - Hong Jiang
- Department of the Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.,Key Laboratory of Kidney Disease Prevention and Control Technology, Hangzhou 310003, China.,The Third-Grade Laboratory under the National State, Administration of Traditional Chinese Medicine, Hangzhou 310000, China
| | - Jianyong Wu
- Department of the Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.,Key Laboratory of Kidney Disease Prevention and Control Technology, Hangzhou 310003, China.,The Third-Grade Laboratory under the National State, Administration of Traditional Chinese Medicine, Hangzhou 310000, China
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Cha DH, Gee HY, Cachau R, Choi JM, Park D, Jee SH, Ryu S, Kim KK, Won HH, Limou S, Myung W, Winkler CA, Cho SK. Contribution of SLC22A12 on hypouricemia and its clinical significance for screening purposes. Sci Rep 2019; 9:14360. [PMID: 31591475 PMCID: PMC6779878 DOI: 10.1038/s41598-019-50798-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 09/18/2019] [Indexed: 11/09/2022] Open
Abstract
Differentiating between inherited renal hypouricemia and transient hypouricemic status is challenging. Here, we aimed to describe the genetic background of hypouricemia patients using whole-exome sequencing (WES) and assess the feasibility for genetic diagnosis using two founder variants in primary screening. We selected all cases (N = 31) with extreme hypouricemia (<1.3 mg/dl) from a Korean urban cohort of 179,381 subjects without underlying conditions. WES and corresponding downstream analyses were performed for the discovery of rare causal variants for hypouricemia. Two known recessive variants within SLC22A12 (p.Trp258*, pArg90His) were identified in 24 out of 31 subjects (77.4%). In an independent cohort, we identified 50 individuals with hypouricemia and genotyped the p.Trp258* and p.Arg90His variants; 47 of the 50 (94%) hypouricemia cases were explained by only two mutations. Four novel coding variants in SLC22A12, p.Asn136Lys, p.Thr225Lys, p.Arg284Gln, and p.Glu429Lys, were additionally identified. In silico studies predict these as pathogenic variants. This is the first study to show the value of genetic diagnostic screening for hypouricemia in the clinical setting. Screening of just two ethnic-specific variants (p.Trp258* and p.Arg90His) identified 87.7% (71/81) of Korean patients with monogenic hypouricemia. Early genetic identification of constitutive hypouricemia may prevent acute kidney injury by avoidance of dehydration and excessive exercise.
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Affiliation(s)
- Do Hyeon Cha
- Department of Pharmacology, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Heon Yung Gee
- Department of Pharmacology, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Raul Cachau
- Advanced Biomedical Computational Science, Frederick National Laboratory for Cancer Research, National Cancer Institute, Frederick, MD, USA
| | - Jong Mun Choi
- Department of Laboratory Medicine, Green Cross, Yongin-si, Gyeonggi-do, Republic of Korea
| | - Daeui Park
- Department of Predictive Toxicology, Korea Institute of Toxicology, Daejeon, Republic of Korea
| | - Sun Ha Jee
- Department of Epidemiology and Health Promotion and Institute for Health Promotion, Graduate School of Public Health, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Seungho Ryu
- Center for Cohort Studies, Total Healthcare Center, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Kyeong Kyu Kim
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea
| | - Hong-Hee Won
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea
| | - Sophie Limou
- Centre de Recherche en Transplantation et Immunologie (CRTI) UMR1064 Inserm, Université de Nantes, Nantes, France.,Institut de Transplantation en Urologie-Néphrologie (ITUN), Nantes University Hospital, Nantes, France.,Ecole Centrale de Nantes, Nantes, France.,Molecular Genetic Epidemiology Section, Basic Science Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Woojae Myung
- Department of Psychiatry, Seoul National University College of Medicine and Bundang Hospital, Seongnam, Korea
| | - Cheryl A Winkler
- Molecular Genetic Epidemiology Section, Basic Science Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Sung Kweon Cho
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea. .,Molecular Genetic Epidemiology Section, Basic Research Laboratory, Center for Cancer Research, National Cancer Institute, 8560 Progress Drive, Frederick, MD 21701, USA.
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