1
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de Oliveira Otto MC, Li XS, Wang Z, Siscovick DS, Newman AB, Lai HTM, Nemet I, Lee Y, Wang M, Fretts A, Lemaitre RN, Tang WW, Lopez O, Hazen SL, Mozaffarian D. Longitudinal Associations of Plasma TMAO and Related Metabolites with Cognitive Impairment and Dementia in Older Adults: The Cardiovascular Health Study. J Alzheimers Dis 2022; 89:1439-1452. [PMID: 36057823 PMCID: PMC9720755 DOI: 10.3233/jad-220477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Animal studies suggest that gut microbiome metabolites such as trimethylamine N-oxide (TMAO) may influence cognitive function and dementia risk. However potential health effects of TMAO and related metabolites remain unclear. OBJECTIVE We examined prospective associations of TMAO, γ-butyrobetaine, crotonobetaine, carnitine, choline, and betaine with risk of cognitive impairment and dementia among older adults aged 65 years and older in the Cardiovascular Health Study (CHS). METHODS TMAO and metabolites were measured in stored plasma specimens collected at baseline. Incident cognitive impairment was assessed using the 100-point Modified Mini-Mental State Examination administered serially up to 7 times. Clinical dementia was identified using neuropsychological tests adjudicated by CHS Cognition Study investigators, and by ICD-9 codes from linked Medicare data. Associations of each metabolite with cognitive outcomes were assessed using Cox proportional hazards models. RESULTS Over a median of 13 years of follow-up, 529 cases of cognitive impairment, and 522 of dementia were identified. After multivariable adjustment for relevant risk factors, no associations were seen with TMAO, carnitine, choline, or betaine. In contrast, higher crotonobetaine was associated with 20-32% higher risk of cognitive impairment and dementia per interquintile range (IQR), while γ-butyrobetaine was associated with ∼25% lower risk of the same cognitive outcomes per IQR.∥Conclusion:These findings suggest that γ-butyrobetaine, crotonobetaine, two gut microbe and host metabolites, are associated with risk of cognitive impairment and dementia. Our results indicate a need for mechanistic studies evaluating potential effects of these metabolites, and their interconversion on brain health, especially later in life.
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Affiliation(s)
- Marcia C de Oliveira Otto
- Division of Epidemiology, Human Genetics and Environmental Science, The University of Texas Health Science Center at Houston School of Public Health, Houston, TX
| | - Xinmin S. Li
- Department of Cardiovascular & Metabolic Sciences, Lerner Research Institute, Cleveland, OH, USA,Center for Microbiome and Human Health, Lerner Research Institute, Cleveland, OH, USA
| | - Zeneng Wang
- Department of Cardiovascular & Metabolic Sciences, Lerner Research Institute, Cleveland, OH, USA,Center for Microbiome and Human Health, Lerner Research Institute, Cleveland, OH, USA
| | | | - Anne B Newman
- Department of Epidemiology, University of Pittsburg, Pittsburg, Pennsylvania
| | - Heidi Tsz Mung Lai
- Friedman School of Nutrition Science and Policy. Tufts University, Boston, MA,Department of Primary Care and Public Health, Imperial College London, London, UK
| | - Ina Nemet
- Department of Cardiovascular & Metabolic Sciences, Lerner Research Institute, Cleveland, OH, USA,Center for Microbiome and Human Health, Lerner Research Institute, Cleveland, OH, USA
| | - Yujin Lee
- Friedman School of Nutrition Science and Policy. Tufts University, Boston, MA,Department of Food and Nutrition, Myongji University, Korea
| | - Meng Wang
- Friedman School of Nutrition Science and Policy. Tufts University, Boston, MA
| | - Amanda Fretts
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
| | - Rozenn N. Lemaitre
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
| | - W.H. Wilson. Tang
- Department of Cardiovascular & Metabolic Sciences, Lerner Research Institute, Cleveland, OH, USA,Center for Microbiome and Human Health, Lerner Research Institute, Cleveland, OH, USA,Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, OH, USA
| | - Oscar Lopez
- Department of Neurology, University of Pittsburg School of Medicine Pittsburg, PA
| | - Stanley L. Hazen
- Department of Cardiovascular & Metabolic Sciences, Lerner Research Institute, Cleveland, OH, USA,Center for Microbiome and Human Health, Lerner Research Institute, Cleveland, OH, USA,Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, OH, USA
| | - Dariush Mozaffarian
- Friedman School of Nutrition Science and Policy. Tufts University, Boston, MA
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2
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Azadegan-Dehkordi F, Koohiyan M, Hoseini M. An update on autosomal recessive hearing loss and loci involved in it. INDIAN JOURNAL OF OTOLOGY 2022. [DOI: 10.4103/indianjotol.indianjotol_115_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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3
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Li Y, Xu Y, Li G, Chen K, Yu H, Gao J, Tian W, Liu Y, Liu P, Zhang L, Zhang Z. A Novel Frameshift Variant of the MITF Gene in a Chinese Family with Waardenburg Syndrome Type 2. Mol Syndromol 2021; 12:244-249. [PMID: 34421503 DOI: 10.1159/000513607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 12/06/2020] [Indexed: 11/19/2022] Open
Abstract
Waardenburg syndrome (WS) is a rare genetic disorder characterized by varying combinations of sensorineural hearing loss and abnormal pigmentation involving the hair, skin and iris. WS is classified into 4 subtypes (WS1-WS4) based on additional symptoms. WS2 is characterized by the absence of additional symptoms and is mainly attributed to variants in the microphthalmia-associated transcription factor (MITF) gene. We detected a novel frameshift variant c.1025_1032delGGAACAAG (NM_198159) of MITF in 5 patients with WS2 from the same Chinese family by using targeted next-generation sequencing and Sanger sequencing. Phenotypic and genotypic analyses of the family members suggested that this novel variants was pathogenic. Our finding expands the spectrum of MITF variants.
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Affiliation(s)
- Ying Li
- Molecular Genetics Laboratory, Department of Clinical Laboratory Science, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
| | - Yajuan Xu
- Department of Obstetrics and Gynecology, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
| | - Genxia Li
- Department of Obstetrics and Gynecology, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
| | - Kang Chen
- Departments of Obstetrics and Gynecology, Wayne State University, Detroit, Michigan, USA.,Perinatology Research Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA.,Mucosal Immunology Studies Team, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Haiyang Yu
- Molecular Genetics Laboratory, Department of Clinical Laboratory Science, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
| | - Jinshuang Gao
- Molecular Genetics Laboratory, Department of Clinical Laboratory Science, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
| | - Weifang Tian
- Molecular Genetics Laboratory, Department of Clinical Laboratory Science, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
| | - Yuehua Liu
- Department of Obstetrics and Gynecology, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
| | - Pingping Liu
- Department of Obstetrics and Gynecology, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
| | - Linlin Zhang
- Molecular Genetics Laboratory, Department of Clinical Laboratory Science, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
| | - Zhan Zhang
- Molecular Genetics Laboratory, Department of Clinical Laboratory Science, The Third Affiliated Hospital of Zhengzhou University - Maternal and Child Health Hospital of Henan Province, Zhengzhou, China
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Hashemzadeh-Chaleshtori M, Azadegan-Dehkordi F, Ashrafi K, Mobini G, Yazdanpanahi N, Shirzad M, Farrokhi E. Detection of two pathogenesis previously unreported myosin xva pathogenic variants in two large Iranian pedigrees with autosomal recessive nonsyndromic hearing loss. INDIAN JOURNAL OF OTOLOGY 2021. [DOI: 10.4103/indianjotol.indianjotol_73_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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5
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Sarmadi A, Nasrniya S, Soleimani Farsani M, Narrei S, Nouri Z, Sepehrnejad M, Nilforoush MH, Abtahi H, Tabatabaiefar MA. A novel pathogenic variant in the LRTOMT gene causes autosomal recessive non-syndromic hearing loss in an Iranian family. BMC MEDICAL GENETICS 2020; 21:127. [PMID: 32517708 PMCID: PMC7285524 DOI: 10.1186/s12881-020-01061-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 06/02/2020] [Indexed: 02/07/2023]
Abstract
Background Hearing loss (HL) is the most common sensorineural disorder with high phenotypic and genotypic heterogeneity, which negatively affects life quality. Autosomal recessive non-syndromic hearing loss (ARNSHL) constitutes a major share of HL cases. In the present study, Whole exome sequencing (WES) was applied to investigate the underlying etiology of HL in an Iranian patient with ARNSHL. Methods A proband from an Iranian consanguineous family was examined via WES, following GJB2 sequencing. WES was utilized to find possible genetic etiology of the disease. Various Bioinformatics tools were used to assess the pathogenicity of the variants. Co-segregation analysis of the candidate variant was carried out. Interpretation of variants was performed according to the American College of Medical Genetics and Genomics (ACMG) guidelines. Results WES results showed a novel frameshift (16 bp deletion) variant (p.Ala170Alafs*20) in the LRTOMT gene. This variant, which resides in exon 6, was found to be co-segregating in the family. It fulfils the criteria set by the ACMG guidelines of being pathogenic. Conclusion Here, we report successful application of WES to identify the molecular pathogenesis of ARNSHL, which is a genetically heterogeneous disorder, in a patient with ARNSHL.
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Affiliation(s)
- Akram Sarmadi
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.,Genetics Department, Erythron Pathobiology and Genetics lab, Isfahan, Iran
| | - Samane Nasrniya
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Maryam Soleimani Farsani
- Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, Iran
| | - Sina Narrei
- Genetics Department, Erythron Pathobiology and Genetics lab, Isfahan, Iran
| | - Zahra Nouri
- Department of Medical Biotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mahsa Sepehrnejad
- Department of Otolaryngology, Al-Zahra Hospital, Isfahan University of Medical Sciences, Isfahan, Iran
| | | | - Hamidreza Abtahi
- Department of Otolaryngology, Al-Zahra Hospital, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohammad Amin Tabatabaiefar
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. .,Pediatric Inherited Diseases Research Center, Research Institute for Primordial Prevention of Noncommunicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran. .,GenTArget Corp (GTAC), Deputy of Research and Technology, Isfahan University of Medical Sciences, Isfahan, Iran.
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Brief Report of Variants Detected in Hereditary Hearing Loss Cases in Iran over a 3-Year Period. IRANIAN JOURNAL OF PUBLIC HEALTH 2019; 48:1910-1915. [PMID: 31850270 PMCID: PMC6908923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 10/29/2022]
Abstract
BACKGROUND Diagnosis of hereditary hearing loss (HHL) as a heterogeneous disorder is very important especially in countries with high rates of consanguinity where the autosomal recessive pattern of inheritance is prevalent. Techniques such as next-generation sequencing, a comprehensive genetic test using targeted genomic enrichment and massively parallel sequencing (TGE + MPS), have made the diagnosis more cost-effective. The aim of this study was to determine HHL variants with comprehensive genetic testing in our country. METHODS Fifty GJB2 negative individuals with HHL were referred to the Kariminejad-Najmabadi Pathology and Genetics Center, Tehran, one of the reference diagnostic genetic laboratories in Iran, during a 3-year period between 2014 and 2017. They were screened with the OtoSCOPE test, the targeted genomic enrichment and massively parallel sequencing (TGE + MPS) platform after a detailed history had been taken along with clinical evaluation. RESULTS Among 32 out of 50 GJB2 negative patients (64%), 34 known pathogenic and novel variants were detected of which 16 (47%) were novel, identified in 10 genes of which the most prevalent were CDH23, MYO7A and MYO15A. CONCLUSION These results provide a foundation from which to make appropriate recommendations for the use of comprehensive genetic testing in the evaluation of Iranian patients with hereditary hearing loss.
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7
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Screening of 10 DFNB Loci Causing Autosomal Recessive Non-Syndromic Hearing Loss in Two Iranian Populations Negative for GJB2 Mutations. IRANIAN JOURNAL OF PUBLIC HEALTH 2019; 48:1704-1713. [PMID: 31700827 PMCID: PMC6825662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Autosomal recessive non-syndromic hearing loss (ARNSHL), one of the global public health concerns, is marked by a high degree of genetic heterogeneity. The role of GJB2, as the most common cause of ARNSHL, is only <20% in the Iranian population. Here, we aimed to determine the relative contribution of several apparently most common loci in a cohort of ARNSHL Iranian families that were negative for the GJB2 mutations. METHODS Totally, 80 Iranian ARNSHL families with 3 or more affected individuals from Isfahan and Hamedan provinces, Iran were enrolled in 2017. After excluding mutations in the GJB2 gene via Sanger sequencing, 60 negative samples (30 families from each province) were analyzed using homozygosity mapping for 10 ARNSHL loci. RESULTS Fourteen families were found to be linked to five different known loci, including DFNB4 (5 families), DFNB2 (3 families), DFNB7/11 (1 family), DFNB9 (2 families) and DFNB3 (3 families). CONCLUSION Despite the high heterogeneity of ARNSHL, the genetic causes were determined in 23.5% of the studied families using homozygosity mapping. This data gives an overview of the ARNSHL etiology in the center and west of Iran, used to establish a diagnostic gene panel including most common loci for hearing loss diagnostics.
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8
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Azadegan-Dehkordi F, Bahrami T, Shirzad M, Karbasi G, Yazdanpanahi N, Farrokhi E, Koohiyan M, Tabatabaiefar MA, Hashemzadeh-Chaleshtori M. Mutations in GJB2 as Major Causes of Autosomal Recessive Non-Syndromic Hearing Loss: First Report of c.299-300delAT Mutation in Kurdish Population of Iran. J Audiol Otol 2018; 23:20-26. [PMID: 30518198 PMCID: PMC6348308 DOI: 10.7874/jao.2018.00185] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 08/12/2018] [Indexed: 11/22/2022] Open
Abstract
Background and Objectives Autosomal recessive non-syndromic hearing loss (ARNSHL) with genetic origin is common (1/2000 births). ARNSHL can be associated with mutations in gap junction protein beta 2 (GJB2). To this end, this cohort investigation aimed to find the contribution of GJB2 gene mutations with the genotype-phenotype correlations in 45 ARNSHL cases in the Kurdish population. Subjects and Methods Genomic DNA was extracted from a total of 45 ARNSHL families. The linkage analysis with 3 short tandem repeat markers linked to GJB2 was performed on 45 ARNSHL families. Only 9 of these families were linked to the DFNB1 locus. All the 45 families who took part were sequenced for confirmation linkage analysis (to perform a large project). Results A total of three different mutations were determined. Two of which [c.35delG and c.-23+1G>A (IVS1+1G>A)] were previously reported but (c.299-300delAT) mutation was novel in the Kurdish population. The homozygous pathogenic mutations of GJB2 gene was observed in nine out of the 45 families (20%), also heterozygous genotype (c.35delG/N)+(c.-23+1G>A/c.-23+1G>A) were observed in 4/45 families (8.8%). The degree of hearing loss (HL) in patients with other mutations was less severe than patients with c.35delG homozygous mutation (p<0.001). Conclusions Our data suggest that GJB2 mutations constitute 20% of the etiology of ARNSHL in Iran; moreover, the c.35delG mutation is the most common HL cause in the Kurdish population. Therefore, these mutations should be included in the molecular testing of HL in this population.
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Affiliation(s)
- Fatemeh Azadegan-Dehkordi
- Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Tayyebe Bahrami
- Department of Medical Genetics, Faculty of Medicine, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Maryam Shirzad
- Medical Plants Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Gelareh Karbasi
- Kurdistan Provinces Social Welfare Organization, Kurdistan, Iran
| | - Nasrin Yazdanpanahi
- Department of Genetics, Falavarjan Branch, Islamic Azad University, Isfahan, Iran
| | - Effat Farrokhi
- Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Mahbobeh Koohiyan
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohammad Amin Tabatabaiefar
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Morteza Hashemzadeh-Chaleshtori
- Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
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Azadegan‐Dehkordi F, Ahmadi R, Koohiyan M, Hashemzadeh‐Chaleshtori M. Update of spectrum c.35delG and c.‐23+1G>A mutations on the
GJB2
gene in individuals with autosomal recessive nonsyndromic hearing loss. Ann Hum Genet 2018; 83:1-10. [DOI: 10.1111/ahg.12284] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Revised: 08/01/2018] [Accepted: 08/06/2018] [Indexed: 12/31/2022]
Affiliation(s)
- Fatemeh Azadegan‐Dehkordi
- Cellular and Molecular Research Center, Basic Health Sciences Institute Shahrekord University of Medical Sciences Shahrekord Iran
| | - Reza Ahmadi
- Clinical Biochemistry Research Center, Basic Health Sciences Institute Shahrekord University of Medical Sciences Shahrekord Iran
| | - Mahbobeh Koohiyan
- Medical Plants Research Center, Basic Health Sciences Institute Shahrekord University of Medical Sciences Shahrekord Iran
| | - Morteza Hashemzadeh‐Chaleshtori
- Cellular and Molecular Research Center, Basic Health Sciences Institute Shahrekord University of Medical Sciences Shahrekord Iran
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NASERI M, AKBARZADEHLALEH M, MASOUDI M, AHANGARI N, POURSADEGH ZONOUZI AA, POURSADEGH ZONOUZI A, SHAMS L, NEJATIZADEH A. Genetic Linkage Analysis of DFNB4, DFNB28, DFNB93 Loci in Autosomal Recessive Non-syndromic Hearing Loss: Evidence for Digenic Inheritance in GJB2 and GJB3 Mutations. IRANIAN JOURNAL OF PUBLIC HEALTH 2018; 47:95-102. [PMID: 29318123 PMCID: PMC5756606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND Autosomal recessive non-syndromic hearing loss (ARNSHL) a most frequent hereditary type of hearing impairment, exhibit tremendous genetic heterogeneity. We aimed to determine the contribution of three common DFNB loci (DFNB4, DFNB28, and DFNB93), and mutation analysis of Gap Junction Beta-2 gene (GJB2) and GJB3 genes in ARNSHL subjects in southern Iran. METHODS Thirty-six large ARNSHL pedigrees (167 individuals) with at least two affected subjects (72 patients) were included in this descriptive study from Hormozgan Province of Iran, during 2014 - 2015. The variation of GJB2 and GJB3 genes were screened using direct sequencing method. The negative samples for GJB2 and GJB3 genes mutations were analyzed for the linkage to DFNB4, DFNB28, and DFNB93 loci by genotyping the corresponding short tandem repeat (STR) markers using polymerase chain reaction (PCR) and polyacrylamide gel electrophoresis (PAGE) methods. RESULTS DNA sequencing of GJB2 were identified heterozygous mutation (964 C/T) in 13.88% of the studied families. Three missense mutations (788G/A, 284C/T and 973G/C) were also detected in coding region of the GJB3 gene. The 284C/T mutation in the GJB3 occurs in compound heterozygosity along with the 964T/C mutation in the GJB2 in one family. Finally, we found no evidence of linkage to either of DFNB4, DFNB93 and DFNB28 loci. CONCLUSION Highlighting the hypothesis that a genetic interaction between GJB2 and GJB3 genes could be lead to ARNSHL, however, no evidence of linkage to the DFNB loci was found. 284C/T variant in GJB3 gene might be pathogenic when accompanied by variant in GJB2 in a digenic pattern. However, further large-scale familial and functional studies are required to challenge this hypothesis.
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Affiliation(s)
- Marzieh NASERI
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Masoud AKBARZADEHLALEH
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Marjan MASOUDI
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Najmeh AHANGARI
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | | | | | - Leila SHAMS
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Azim NEJATIZADEH
- Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran,Corresponding Author:
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Wang M, Zhang F, Xu L, Xiao Y, Li J, Fan Z, Sun Q, Bai X, Wang H. Novel compound heterozygous mutations in SLC26A4 gene in a Chinese Han family with enlarged vestibular aqueduct. Int J Pediatr Otorhinolaryngol 2016; 90:170-174. [PMID: 27729126 DOI: 10.1016/j.ijporl.2016.09.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 09/13/2016] [Accepted: 09/15/2016] [Indexed: 12/20/2022]
Abstract
OBJECTIVE To identify the disease-related SLC26A4 mutants in a Chinese Han pedigree associated with Enlarged vestibular aqueduct (EVA). METHODS EVA diagnosis was based on the family history, clinical examinations, systematically audiometric evaluations, high-resolution computed tomography (HRCT) of the temporal bone, and magnetic resonance imaging (MRI) of inner ear. Sanger sequencing and mutation analysis of the SLC26A4 gene were performed in all members of this family to identify the disease-related SLC26A4 mutants. Mutations in the SLC26A4 gene were compared with 200 ethnically matched control persons to exclude common polymorphism. RESULTS All members in this family were negative for systemic and thyroid diseases. There were three subjects (I-2, II-2 and II-3) with bilateral sensorineural deafness since childhood. Temporal bone HRCT scans and inner ear MRI showed bilateral enlarged vestibular aqueduct with Mondini malformation in II-2 and II-3. A novel SLC26A4 splice-site mutation c.1001 + 5G > C was identified in compound heterozygosity with the mutation c.919-2A > G in the proband and in II-2. This novel compound heterozygote of two splice site mutations was not found in 200 normal hearing Chinese Han controls. CONCLUSIONS A novel splice site mutation of c.1001 + 5G > C was identified, and the novel compound heterozygote of two splice site mutations, c.1001 + 5G > C and c.919-2A > G, in the SLC26A4 gene has been linked to hearing impairment in EVA patients.
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Affiliation(s)
- Mingming Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratories of Otology, Jinan, China
| | - Fengguo Zhang
- Department of Otorhinolaryngology Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratories of Otology, Jinan, China
| | - Lei Xu
- Department of Otorhinolaryngology Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratories of Otology, Jinan, China
| | - Yun Xiao
- Department of Otorhinolaryngology Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratories of Otology, Jinan, China
| | - Jianfeng Li
- Department of Otorhinolaryngology Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratories of Otology, Jinan, China
| | - Zhaomin Fan
- Department of Otorhinolaryngology Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratories of Otology, Jinan, China
| | - Qian Sun
- Emory University, Human Genetics Department, Atlanta, GA, USA
| | - Xiaohui Bai
- Department of Otorhinolaryngology Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratories of Otology, Jinan, China.
| | - Haibo Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratories of Otology, Jinan, China.
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Identification of a novel mutation in SLC26A4 gene in a Chinese family with enlarged vestibular aqueduct syndrome. Int J Pediatr Otorhinolaryngol 2016; 85:75-9. [PMID: 27240500 DOI: 10.1016/j.ijporl.2016.03.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 03/12/2016] [Accepted: 03/15/2016] [Indexed: 12/31/2022]
Abstract
OBJECTIVE To investigate the genetic causes of hearing loss in a two generation Chinese family with enlarged vestibular aqueduct syndrome (EVAS). METHODS Clinical and genetic evaluations were conducted in a deaf proband and her normal-hearing parents. Sanger sequencing analysis of all the 21 exons, the exon-intron boundaries and the promoter in SLC26A4 gene was performed to detect the pathogenic mutations. PCR-restricted fragment length polymorphism (PCR-RFLP) was used to further identify the mutation. Phylogenetic analysis was carried out with multiple sequence alignment using BioEdit software. Three-dimensional (3D) modeling of the human wild-type and mutant SLC26A4 (NP_000432.1) was carried out using I-TASSER (http://zhanglab.ccmb.med.umich.edu/). RESULTS Clinical examinations showed that the proband suffered from typical features of sensorineural hearing loss with enlarged vestibular aqueduct. A novel nonsense mutation c.2118C>A (p.C706X) in exon 19 was identified in compound heterozygosity with the splice-site mutation c.919-2A>G in the proband by using Sanger sequencing. The mother was a heterozygous carrier of c.919-2A>G in intron 7, while the father was a heterozygous carrier of c.2118C>A. The mutation c.2118C>A was not found in 200 unrelated controls using Sanger sequencing. PCR-RFLP showed the PCR product of the proband was not digested at 2110 by Fau I because of the c.2118C>A mutation. 3D-structure modeling indicated that the mutation c.2118C>A resulted in a truncate Pendrin protein. Protein alignment indicated high conservation of p.C706 residue in healthy Homo, Nomascus, Pan, Macaca, Canis, Sus, Mus, Rattus, Cricetulus and Xenopus. CONCLUSIONS This study revealed a novel heterozygous mutation c.2118C>A (p.C706X) compound with c.919-2A>G in SLC26A4 gene in a patient with EVAS.
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Mohseni M, Honarpour A, Mozafari R, Davarnia B, Najmabadi H, Kahrizi K. Identification of a founder mutation for Pendred syndrome in families from northwest Iran. Int J Pediatr Otorhinolaryngol 2014; 78:1828-32. [PMID: 25239229 DOI: 10.1016/j.ijporl.2014.08.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 08/24/2014] [Accepted: 08/25/2014] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Mutations in the SLC26A4 gene cause both Pendred syndrome and autosomal recessive nonsyndromic hearing loss (ARNSHL) at the DFNB4 locus. The SLC26A4 mutations vary among different communities. Previous studies have shown that mutations in the SLC26A4 gene are responsible for the more common syndromic hereditary hearing loss in Iran. This study assesses the possibility of a founder mutation for Pendred syndrome in northwest Iran. MATERIALS AND METHODS In this study, we performed comprehensive clinical and genetic evaluations in two unrelated families from northwest Iran with nine members affected by hearing loss (HL). After testing short tandem repeat (STR) markers to confirm linkage to the SLC26A4 locus, we screened the SLC26A4 gene by Sanger sequencing of all 21 exons, exon-intron boundaries and the promoter region for any causative mutation. We identified the same causative mutation in these two families as we had detected earlier in two other Azeri families from northwest Iran. To investigate the possibility of a founder effect in these four families, we conducted haplotype analysis, and 14 single nucleotide polymorphisms (SNPs) throughout the SLC26A4 gene were genotyped. RESULTS Patients in the two families showed the phenotype of Pendred syndrome. A known frameshift mutation (c.965insA, p.N322Fs7X) in exon 8 was identified in the two families, which was the same mutation that we detected previously in two other Azeri families. The results of haplotype analysis showed that all 15 patients from four families shared the founder mutation. Common haplotypes were not observed in noncarrier members. CONCLUSIONS Based on the results of our two studies, the c.965insA mutation has only been described in Iranian families from northwest Iran, so there is evidence for a founder mutation originating in this part of Iran.
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Affiliation(s)
- Marzieh Mohseni
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran
| | - Asal Honarpour
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran
| | - Reza Mozafari
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran
| | - Behzad Davarnia
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran
| | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran
| | - Kimia Kahrizi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences (USWR), Tehran, Iran.
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Reiisi S, Sanati MH, Tabatabaiefar MA, Ahmadian S, Reiisi S, Parchami S, Porjafari H, Shahi H, Shavarzi A, Hashemzade Chaleshtori M. The Study of SLC26A4 Gene Causing Autosomal Recessive Hearing Loss by Linkage Analysis in a Cohort of Iranian Populations. INTERNATIONAL JOURNAL OF MOLECULAR AND CELLULAR MEDICINE 2014; 3:176-82. [PMID: 25317404 PMCID: PMC4170491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2014] [Revised: 06/25/2014] [Accepted: 07/22/2014] [Indexed: 10/25/2022]
Abstract
Sensorineural non-syndromic hearing loss is the most common disorder which affects 1 in 500 newborns. Hearing loss is an extremely heterogeneous defect with more than 100 loci identified to date. According to the studies, mutations in GJB2 are estimated to be involved in 50- 80% of autosomal recessive non-syndromic hearing loss cases, but contribution of other loci in this disorder is yet ambiguous. With regard to studies, DFNB4 locus (SLC26A4) can be classified as the second cause of hearing loss. So, this study aimed to determine the contribution of this locus in hearing loss as well as the frequency of SLC26A4 gene mutations in a population in the west of Iran. In this descriptive laboratory study, we included 30 families from the west of Iran with no mutation in GJB2 gene. Linkage analysis was performed by DFNB4 (SLC26A4) molecular markers (STR). The families with hearing loss linked to this locus were further analyzed for mutation detection. SLC26A4 gene exons were amplified and analyzed using direct DNA sequencing. In studied families, 2 families displayed linkage to DFNB4 locus. Identified mutations include mutation in exon 5 (c.416 G>T) and in splicing site of exon 7 (IVS-2 A>G or c.919-2 A>G).
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Affiliation(s)
- Somayeh Reiisi
- Medical Genetics Department, National Institute of Genetic Engineering and Biotechnology (NIGEB)
| | - Mohammad Hosein Sanati
- Medical Genetics Department, National Institute of Genetic Engineering and Biotechnology (NIGEB)
| | | | - Shahla Ahmadian
- Cellular and Molecular Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Salimeh Reiisi
- Biochemistry Department, Maleke-Ashtar University of Technology, Tehran Iran
| | - Shahrbanoo Parchami
- Cellular and Molecular Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Hamid Porjafari
- Medical Genetics Department, Hamedan University of Medical Sciences, Hamedan, Iran
| | - Heshmat Shahi
- Medical Genetics Department, National Institute of Genetic Engineering and Biotechnology (NIGEB)
| | - Afsaneh Shavarzi
- Cellular and Molecular Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Morteza Hashemzade Chaleshtori
- Cellular and Molecular Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran.,Corresponding author: Cellular and Molecular Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran.
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