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Wang WQ, Gao X, Huang SS, Kang DY, Xu JC, Yang K, Han MY, Zhang X, Yang SY, Yuan YY, Dai P. Genetic Analysis of the LOXHD1 Gene in Chinese Patients With Non-Syndromic Hearing Loss. Front Genet 2022; 13:825082. [PMID: 35711932 PMCID: PMC9196635 DOI: 10.3389/fgene.2022.825082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 02/22/2022] [Indexed: 11/13/2022] Open
Abstract
Non-syndromic hearing loss (NSHL) is a common neurosensory disease with an extreme genetic heterogeneity which has been linked to variants in over 120 genes. The LOXHD1 gene (DFNB77), encoding lipoxygenase homology domain 1, is a rare hearing loss gene found in several populations. To evaluate the importance of LOXHD1 variants in Chinese patients with NSHL, we performed genetic analysis on LOXHD1 in 2,901 sporadic Chinese patients to identify the aspect and frequency of LOXHD1 causative variants. Next-generation sequencing using a custom gene panel of HL was conducted on 2,641 unrelated patients and whole-exome sequencing on the remaining 260 patients. A total of 33 likely causative variants were identified in 21 patients, including 20 novel variants and 13 previously reported pathogenic variants. Each of the 20 novel variants was evaluated according to ACMG criteria. These findings showed that causative variants in LOXHD1 were found in about 0.72% (21/2,901) of Chinese NSHL patients. This study is by far the largest number of novel variants identified in this gene expanding the range of pathogenic variants in LOXHD1, and suggests that variants in this gene occur relatively commonly in Chinese NSHL patients. This extensive investigation of LOXHD1 in Chinese NSHL patients proposed six recurrent LOXHD1 variants. These findings may assist in both molecular diagnosis and genetic counseling.
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Affiliation(s)
- Wei-Qian Wang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China.,Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Xue Gao
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China.,Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Sha-Sha Huang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Dong-Yang Kang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Jin-Cao Xu
- Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Kun Yang
- Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Ming-Yu Han
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Xin Zhang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Su-Yan Yang
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Yong-Yi Yuan
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
| | - Pu Dai
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, ChinaNational Clinical Research Center for Otolaryngologic DiseasesState Key Lab of Hearing Science, Chinese PLA General Hospital, Chinese PLA Medical School, Ministry of Education, College of Otolaryngology Head and Neck Surgery, Beijing, China
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Zhang C, Hao S, Liu Y, Zhou B, Liu F, Zheng L, Ma P, Liu Q, Lin X, Yan Y, Zhang Q. A novel LOXHD1 variant in a Chinese couple with hearing loss. J Int Med Res 2019; 47:6082-6090. [PMID: 31709873 PMCID: PMC7045666 DOI: 10.1177/0300060519884197] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Objective To perform molecular diagnosis and genetic counseling in a young Chinese
couple with congenital hearing loss. Methods Variant screening analysis was performed by PCR and direct Sanger sequencing
or targeted next-generation sequencing of all known hearing loss genes.
Novel variants were evaluated by PolyPhen2 and PROVEAN software tools to
evaluate possible effects on protein function. Results We identified causative variants in the young couple: c.235delC
(rs80338943)/c.299-300delAT (rs111033204) compound heterozygous variants of
GJB2 in the husband and c.1828G>A (p.Glu610Lys,
rs535637788)/c.2825-2827delAGA compound heterozygous variants of
LOXHD1 in the wife. The LOXHD1
c.1828G>A variant has only previously been reported in a Mexican-American
individual in the 1000 Genomes Project database. Using PolyPhen2 and
PROVEAN, we speculated that the LOXHD1 variant c.1828G>A
is potentially pathogenic. Conclusion We carried out molecular diagnosis in a young couple with congenital hearing
loss, and identified different disease-causing genes in the two individuals.
The LOXHD1 variant c.1828G>A present in the wife had not
previously been reported in individuals with congenital hearing loss. We
determined this to be a potential pathogenic variant, and a novel variant
associated with hearing loss in a Chinese individual.
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Affiliation(s)
- Chuan Zhang
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
| | - Shengju Hao
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
| | - Yali Liu
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
| | - Bingbo Zhou
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
| | - Furong Liu
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
| | - Lei Zheng
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
| | - Panpan Ma
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
| | - Qing Liu
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
| | - Xiaojuan Lin
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
| | - Yousheng Yan
- National Research Institute for Family Planning, Beijing, China
| | - Qinghua Zhang
- Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Key Laboratory of Birth Defects Prevention and Control, Lanzhou, Gansu, China
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Maekawa K, Nishio SY, Abe S, Goto SI, Honkura Y, Iwasaki S, Kanda Y, Kobayashi Y, Oka SI, Okami M, Oshikawa C, Sakuma N, Sano H, Shirakura M, Uehara N, Usami SI. Mutational Spectrum and Clinical Features of Patients with LOXHD1 Variants Identified in an 8074 Hearing Loss Patient Cohort. Genes (Basel) 2019; 10:E735. [PMID: 31547530 DOI: 10.3390/genes10100735] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 08/28/2019] [Accepted: 09/19/2019] [Indexed: 12/16/2022] Open
Abstract
Variants of the LOXHD1 gene, which are expressed in hair cells of the cochlea and vestibule, have been reported to cause a progressive form of autosomal recessive non-syndromic hereditary hearing loss, DFNB77. In this study, genetic screening was conducted on 8074 Japanese hearing loss patients utilizing massively parallel DNA sequencing to identify individuals with LOXHD1 variants and to assess their phenotypes. A total of 28 affected individuals and 21 LOXHD1 variants were identified, among which 13 were novel variants. A recurrent variant c.4212 + 1G > A, only reported in Japanese patients, was detected in 18 individuals. Haplotype analysis implied that this variation occurred in a mutational hot spot, and that multiple ancestors of Japanese population had this variation. Patients with LOXHD1 variations mostly showed early onset hearing loss and presented different progression rates. We speculated that the varying severities and progression rates of hearing loss are the result of environmental and/or other genetic factors. No accompanying symptoms, including vestibular dysfunction, with hearing loss were detected in this study. Few studies have reported the clinical features of LOXHD1-gene associated hearing loss, and this study is by far the largest study focused on the evaluation of this gene.
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Wesdorp M, Schreur V, Beynon AJ, Oostrik J, van de Kamp JM, Elting MW, van den Boogaard MJH, Feenstra I, Admiraal RJC, Kunst HPM, Hoyng CB, Kremer H, Yntema HG, Pennings RJE, Schraders M. Further audiovestibular characterization of DFNB77, caused by deleterious variants in LOXHD1, and investigation into the involvement of Fuchs corneal dystrophy. Clin Genet 2018; 94:221-231. [PMID: 29676012 DOI: 10.1111/cge.13368] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 04/08/2018] [Accepted: 04/16/2018] [Indexed: 12/15/2022]
Abstract
This study focuses on further characterization of the audiovestibular phenotype and on genotype-phenotype correlations of DFNB77, an autosomal recessive type of hearing impairment (HI). DFNB77 is associated with disease-causing variants in LOXHD1, and is genetically and phenotypically highly heterogeneous. Heterozygous deleterious missense variants in LOXHD1 have been associated with late-onset Fuchs corneal dystrophy (FCD). However, up to now screening for FCD of heterozygous carriers in DFNB77 families has not been reported. This study describes the genotype and audiovestibular phenotype of 9 families with DFNB77. In addition, carriers within the families were screened for FCD. Fifteen pathogenic missense and truncating variants were identified, of which 12 were novel. The hearing phenotype showed high inter- and intrafamilial variation in severity and progression. There was no evidence for involvement of the vestibular system. None of the carriers showed (pre-clinical) symptoms of FCD. Our findings expand the genotypic and phenotypic spectrum of DFNB77, but a clear correlation between the type or location of the variant and the severity or progression of HI could not be established. We hypothesize that environmental factors or genetic modifiers are responsible for phenotypic differences. No association was found between heterozygous LOXHD1 variants and the occurrence of FCD in carriers.
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Affiliation(s)
- M Wesdorp
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, Nijmegen, the Netherlands.,The Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Cognition and Behaviour, Donders Institute for Brain, Radboud University Medical Center, Nijmegen, the Netherlands
| | - V Schreur
- Department of Cognition and Behaviour, Donders Institute for Brain, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Ophthalmology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - A J Beynon
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Cognition and Behaviour, Donders Institute for Brain, Radboud University Medical Center, Nijmegen, the Netherlands
| | - J Oostrik
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Cognition and Behaviour, Donders Institute for Brain, Radboud University Medical Center, Nijmegen, the Netherlands
| | - J M van de Kamp
- Department of Clinical Genetics, VU University Medical Center, Amsterdam, the Netherlands
| | - M W Elting
- Department of Clinical Genetics, VU University Medical Center, Amsterdam, the Netherlands
| | | | - I Feenstra
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, the Netherlands
| | - R J C Admiraal
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, Nijmegen, the Netherlands
| | - H P M Kunst
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, Nijmegen, the Netherlands.,Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, the Netherlands
| | - C B Hoyng
- Department of Cognition and Behaviour, Donders Institute for Brain, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Ophthalmology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - H Kremer
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Cognition and Behaviour, Donders Institute for Brain, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Human Genetics, Radboud University Medical Center, Nijmegen, the Netherlands
| | - H G Yntema
- Department of Cognition and Behaviour, Donders Institute for Brain, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Human Genetics, Radboud University Medical Center, Nijmegen, the Netherlands
| | - R J E Pennings
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Cognition and Behaviour, Donders Institute for Brain, Radboud University Medical Center, Nijmegen, the Netherlands
| | - M Schraders
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Cognition and Behaviour, Donders Institute for Brain, Radboud University Medical Center, Nijmegen, the Netherlands
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Minami SB, Mutai H, Namba K, Sakamoto H, Matsunaga T. Clinical characteristics of a Japanese family with hearing loss accompanied by compound heterozygous mutations in LOXHD1. Auris Nasus Larynx 2016; 43:609-13. [PMID: 26973026 DOI: 10.1016/j.anl.2016.02.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 02/09/2016] [Accepted: 02/15/2016] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To report two novel LOXHD1 mutations, including missense mutations and the clinical features of the patients. METHODS We studied a three-generation Japanese family with hearing loss. Targeted next-generation sequencing was used for genetic analysis. Conditional orientation response audiometry and pure tone audiometry were used to assess hearing. SWISS-MODEL was used for molecular modeling of the PLAT domain in LOXHD1 protein. RESULTS The two sisters, who had either mild or severe high-frequency hearing loss, were compound heterozygous for two novel mutations (c.5674G>T [p.V1892F] and c.4212+1G>A) in LOXHD1, which is responsible for autosomal-recessive nonsyndromic hearing loss DFNB77. These cases showed less severe hearing impairment than the previously reported cases carrying LOXHD1 mutations, but their hearing loss appeared to be progressive. Molecular modeling predicted that distorted structure of the PLAT domain in the p.V1892F mutant could lead to decreased affinity of the protein to lipid membrane resulting in hair cell dysfunction. CONCLUSION We report a Japanese family carrying compound heterozygotes of truncating and nontruncating mutations in LOXHD1 identified by targeted NGS analysis. The fact of lower degree of hearing impairment in our cases than previously reported and the molecular modeling of the missense mutant provide insight to the genotype-phenotype correlation of DFNB77.
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Affiliation(s)
- Shujiro B Minami
- National Hospital Organization Tokyo Medical Center, Department of Otolaryngology, 2-5-1 Higashigaoka, Meguroku, Tokyo 152-8901, Japan; National Hospital Organization Tokyo Medical Center, National Institute of Sensory Organs, 2-5-1 Higashigaoka, Meguroku, Tokyo 152-8901, Japan
| | - Hideki Mutai
- National Hospital Organization Tokyo Medical Center, National Institute of Sensory Organs, 2-5-1 Higashigaoka, Meguroku, Tokyo 152-8901, Japan
| | - Kazunori Namba
- National Hospital Organization Tokyo Medical Center, National Institute of Sensory Organs, 2-5-1 Higashigaoka, Meguroku, Tokyo 152-8901, Japan
| | - Hirokazu Sakamoto
- Hyogo Prefectural Kobe Children's Hospital, Department of Otolaryngology, 1-1-1 Takakuradai, Sumaku, Koube, Hyogo 654-0091, Japan
| | - Tatsuo Matsunaga
- National Hospital Organization Tokyo Medical Center, Department of Otolaryngology, 2-5-1 Higashigaoka, Meguroku, Tokyo 152-8901, Japan; National Hospital Organization Tokyo Medical Center, National Institute of Sensory Organs, 2-5-1 Higashigaoka, Meguroku, Tokyo 152-8901, Japan.
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6
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Mori K, Moteki H, Kobayashi Y, Azaiez H, Booth KT, Nishio SY, Sato H, Smith RJH, Usami SI. Mutations in LOXHD1 gene cause various types and severities of hearing loss. Ann Otol Rhinol Laryngol 2015; 124 Suppl 1:135S-41S. [PMID: 25792669 DOI: 10.1177/0003489415574067] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE We present 2 families that were identified with novel mutations in LOXHD1 as a cause of nonprogressive hearing loss. METHODS One thousand three hundred fourteen (1314) Japanese subjects with sensorineural hearing loss from unrelated families were enrolled in the study. Targeted genomic enrichment and massively parallel sequencing of all known nonsyndromic hearing loss genes were performed to identify the genetic cause of hearing loss. RESULTS Two patients in 1 family affected with homozygous mutation c.879+1G>A in LOXHD1 showed profound congenital hearing loss, whereas 2 patients in another family with compound heterozygous mutations, c.5869G>T (p.E1957X) and c.4480C>T (p.R1494X), showed moderate to severe hearing loss. CONCLUSION Mutations in LOXHD1 are extremely rare, and these cases are the first identified in a Japanese population. The genotype-phenotype correlation in LOXHD1 is still unclear. The differences in phenotypes in each patient might be the result of the nature of the mutations or the location on the gene, or be influenced by a genetic modifier.
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Affiliation(s)
- Kentaro Mori
- Department of Otolaryngology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Hideaki Moteki
- Department of Otolaryngology, Shinshu University School of Medicine, Matsumoto, Japan Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan Department of Otolaryngology-Head and Neck Surgery, Molecular Otolaryngology & Renal Research Labs, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Yumiko Kobayashi
- Department of Otolaryngology, Iwate Medical University School of Medicine, Iwate, Japan
| | - Hela Azaiez
- Department of Otolaryngology-Head and Neck Surgery, Molecular Otolaryngology & Renal Research Labs, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Kevin T Booth
- Department of Otolaryngology-Head and Neck Surgery, Molecular Otolaryngology & Renal Research Labs, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Shin-Ya Nishio
- Department of Otolaryngology, Shinshu University School of Medicine, Matsumoto, Japan Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
| | - Hiroaki Sato
- Department of Otolaryngology, Iwate Medical University School of Medicine, Iwate, Japan
| | - Richard J H Smith
- Department of Otolaryngology-Head and Neck Surgery, Molecular Otolaryngology & Renal Research Labs, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Shin-Ichi Usami
- Department of Otolaryngology, Shinshu University School of Medicine, Matsumoto, Japan Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
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