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Almalki F. Review and research gap identification in genetics causes of syndromic and nonsyndromic hearing loss in Saudi Arabia. Ann Hum Genet 2024; 88:364-381. [PMID: 38517009 DOI: 10.1111/ahg.12559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 02/13/2024] [Accepted: 03/04/2024] [Indexed: 03/23/2024]
Abstract
Congenital hearing loss is one of the most common sensory disabilities worldwide. The genetic causes of hearing loss account for 50% of hearing loss. Genetic causes of hearing loss can be classified as nonsyndromic hearing loss (NSHL) or syndromic hearing loss (SHL). NSHL is defined as a partial or complete hearing loss without additional phenotypes; however, SHL, known as hearing loss, is associated with other phenotypes. Both types follow a simple Mendelian inheritance fashion. Several studies have been conducted to uncover the genetic factors contributing to NSHL and SHL in Saudi patients. However, these studies have encountered certain limitations. This review assesses and discusses the genetic factors underpinning NSHL and SHL globally, with a specific emphasis on the Saudi Arabian context. It also explores the prevalence of the most observed genetic causes of NSHL and SHL in Saudi Arabia. It also sheds light on areas where further research is needed to fully understand the genetic foundations of hearing loss in the Saudi population. This review identifies several gaps in research in NSHL and SHL and provides insights into potential research to be conducted.
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Affiliation(s)
- Faisal Almalki
- Medical Laboratories Technology Department, College of Applied Medical Sciences, Taibah University, Al Madinah Al Munwarah, Saudi Arabia
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2
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Bernardinelli E, Huber F, Roesch S, Dossena S. Clinical and Molecular Aspects Associated with Defects in the Transcription Factor POU3F4: A Review. Biomedicines 2023; 11:1695. [PMID: 37371790 DOI: 10.3390/biomedicines11061695] [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: 04/20/2023] [Revised: 06/07/2023] [Accepted: 06/08/2023] [Indexed: 06/29/2023] Open
Abstract
X-linked deafness (DFNX) is estimated to account for up to 2% of cases of hereditary hearing loss and occurs in both syndromic and non-syndromic forms. POU3F4 is the gene most commonly associated with X-linked deafness (DFNX2, DFN3) and accounts for about 50% of the cases of X-linked non-syndromic hearing loss. This gene codes for a transcription factor of the POU family that plays a major role in the development of the middle and inner ear. The clinical features of POU3F4-related hearing loss include a pathognomonic malformation of the inner ear defined as incomplete partition of the cochlea type 3 (IP-III). Often, a perilymphatic gusher is observed upon stapedectomy during surgery, possibly as a consequence of an incomplete separation of the cochlea from the internal auditory canal. Here we present an overview of the pathogenic gene variants of POU3F4 reported in the literature and discuss the associated clinical features, including hearing loss combined with additional phenotypes such as cognitive and motor developmental delays. Research on the transcriptional targets of POU3F4 in the ear and brain is in its early stages and is expected to greatly advance our understanding of the pathophysiology of POU3F4-linked hearing loss.
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Affiliation(s)
- Emanuele Bernardinelli
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, 5020 Salzburg, Austria
| | - Florian Huber
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, 5020 Salzburg, Austria
| | - Sebastian Roesch
- Department of Otorhinolaryngology, Head and Neck Surgery, Paracelsus Medical University, 5020 Salzburg, Austria
| | - Silvia Dossena
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, 5020 Salzburg, Austria
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3
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Defourny J. Considering gene therapy to protect from X-linked deafness DFNX2 and associated neurodevelopmental disorders. IBRAIN 2022; 8:431-441. [PMID: 37786584 PMCID: PMC10529175 DOI: 10.1002/ibra.12068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 08/10/2022] [Accepted: 09/13/2022] [Indexed: 10/04/2023]
Abstract
Mutations and deletions in the gene or upstream of the gene encoding the POU3F4 transcription factor cause X-linked progressive deafness DFNX2 and additional neurodevelopmental disorders in humans. Hearing loss can be purely sensorineural or mixed, that is, with both conductive and sensorineural components. Affected males show anatomical abnormalities of the inner ear, which are jointly defined as incomplete partition type III. Current approaches to improve hearing and speech skills of DFNX2 patients do not seem to be fully effective. Owing to inner ear malformations, cochlear implantation is surgically difficult and may predispose towards severe complications. Even in cases where implantation is safely performed, hearing and speech outcomes remain highly variable among patients. Mouse models for DFNX2 deafness revealed that sensorineural loss could arise from a dysfunction of spiral ligament fibrocytes in the lateral wall of the cochlea, which leads to reduced endocochlear potential. Highly positive endocochlear potential is critical for sensory hair cell mechanotransduction and hearing. In this context, here, we propose to develop a therapeutic approach in male Pou3f4 -/y mice based on an adeno-associated viral (AAV) vector-mediated gene transfer in cochlear spiral ligament fibrocytes. Among a broad range of AAV vectors, AAV7 was found to show a strong tropism for the spiral ligament. Thus, we suggest that an AAV7-mediated delivery of Pou3f4 complementary DNA in the spiral ligament of Pou3f4 -/y mice could represent an attractive strategy to prevent fibrocyte degeneration and to restore normal cochlear functions and properties, including a positive endocochlear potential, before hearing loss progresses to profound deafness.
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Affiliation(s)
- Jean Defourny
- GIGA‐Neurosciences, Unit of Cell and Tissue BiologyUniversity of Liège, C.H.U. B36LiègeBelgium
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Chen Y, Qiu J, Wu Y, Jia H, Jiang Y, Jiang M, Wang Z, Sheng HB, Hu L, Zhang Z, Wang Z, Li Y, Huang Z, Wu H. Genetic findings of Sanger and nanopore single-molecule sequencing in patients with X-linked hearing loss and incomplete partition type III. Orphanet J Rare Dis 2022; 17:65. [PMID: 35189936 PMCID: PMC8862311 DOI: 10.1186/s13023-022-02235-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 02/06/2022] [Indexed: 12/01/2022] Open
Abstract
Background POU3F4 is the causative gene for X-linked deafness-2 (DFNX2), characterized by incomplete partition type III (IP-III) malformation of the inner ear. The purpose of this study was to investigate the clinical characteristics and molecular findings in IP-III patients by Sanger or nanopore single-molecule sequencing. Methods Diagnosis of IP-III was mainly based on clinical characteristics including radiological and audiological findings. Sanger sequencing of POU3F4 was carried out for these IP-III patients. For those patients with negative results for POU3F4 Sanger sequencing, nanopore long-read single-molecule sequencing was used to identify the possible pathogenic variants. Hearing intervention outcomes of hearing aids (HAs) fitting and cochlear implantation (CI) were also analyzed. Aided pure tone average (PTA) was further compared between two groups of patients according to their different locations of POU3F4 variants: in the exon region or in the upstream region. Results In total, 18 male patients from 14 unrelated families were diagnosed with IP-III. 10 variants were identified in POU3F4 by Sanger sequencing and 6 of these were reported for the first time (p.Gln181*, p.Val215Gly, p.Arg282Gln, p.Gln316*, c.903_912 delins TGCCA and p.Arg205del). Four different deletions that varied from 80 to 486 kb were identified 876–1503 kb upstream of POU3F4 by nanopore long-read single-molecule sequencing. De novo genetic mutations occurred in 21.4% (3/14) of patients with POU3F4 mutations. Among these 18 patients, 7 had bilateral HAs and 10 patients received unilateral CI. The mean aided PTA for HAs and CI users were 41.1 ± 5.18 and 40.3 ± 7.59 dB HL respectively. The mean PTAs for patients with the variants located in the exon and upstream regions were 39.6 ± 6.31 versus 43.0 ± 7.10 dB HL, which presented no significant difference (p = 0.342). Conclusions Among 14 unrelated IP-III patients, 28.6% (4/14) had no definite mutation in exon region of POU3F4. However, possible pathogenic deletions were identified in upstream region of this gene. De novo genetic mutations occurred in 21.4% (3/14) of patients with POU3F4 mutation. There was no significant difference of hearing intervention outcomes between the IP-III patients with variants located in the exon region and in the upstream region. Supplementary Information The online version contains supplementary material available at 10.1186/s13023-022-02235-7.
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Study of complex structural variations of X-linked deafness-2 based on single-molecule sequencing. Biosci Rep 2021; 41:228372. [PMID: 33860785 PMCID: PMC8193640 DOI: 10.1042/bsr20203740] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 03/21/2021] [Accepted: 03/31/2021] [Indexed: 12/16/2022] Open
Abstract
X-linked deafness-2 (DFNX2) is cochlear incomplete partition type III (IP-III), one of inner ear malformations characterized by an abnormally wide opening in the bone separating the basal turn of the cochlea from the internal auditory canal, fixation of the stapes and cerebrospinal fluid (CSF) gusher upon stapedectomy or cochleostomy. The causative gene of DFNX2 was POU3F4. To investigate the genetic causes of DFNX2 and compare the efficiency of different sequencing methods, 12 unrelated patients were enrolled in the present study. Targeted next-generation sequencing (NGS) and long-read sequencing were used to analyze the genetic etiology of DFNX2. Six variants of POU3F4 were identified in this cohort by NGS. Three patients with a negative diagnosis based on NGS were enrolled in further long-read sequencing. Two of them were all found to carry structural variations (SVs) on chromosome X, consisting of an 870-kb deletion (DEL) at upstream of POU3F4 and an 8-Mb inversion (INV). The 870-kb DEL may have been due to non-homologous end joining (NHEJ), while non-allelic homologous recombination (NAHR) within a single chromatid may have accounted for the 8-Mb INV. Common POU3F4 mutations in DFNX2 included point mutations, small insertions and deletions (INDELs), and exon mutations, which can be detected by Sanger sequencing and NGS. Single-molecule long-read sequencing constitutes an additional and valuable method for accurate detection of pathogenic SVs in IP-III patients with negative NGS results.
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Tekin AM, Matulic M, Wuyts W, Assadi MZ, Mertens G, van Rompaey V, Li Y, van de Heyning P, Topsakal V. A New Pathogenic Variant in POU3F4 Causing Deafness Due to an Incomplete Partition of the Cochlea Paved the Way for Innovative Surgery. Genes (Basel) 2021; 12:genes12050613. [PMID: 33919129 PMCID: PMC8143104 DOI: 10.3390/genes12050613] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/09/2021] [Accepted: 04/11/2021] [Indexed: 12/20/2022] Open
Abstract
Incomplete partition type III (IP-III) is a relatively rare inner ear malformation that has been associated with a POU3F4 gene mutation. The IP-III anomaly is mainly characterized by incomplete separation of the modiolus of the cochlea from the internal auditory canal. We describe a 71-year-old woman with profound sensorineural hearing loss diagnosed with an IP-III of the cochlea that underwent cochlear implantation. Via targeted sequencing with a non-syndromic gene panel, we identified a heterozygous c.934G > C p. (Ala31Pro) pathogenic variant in the POU3F4 gene that has not been reported previously. IP-III of the cochlea is challenging for cochlear implant surgery for two main reasons: liquor cerebrospinalis gusher and electrode misplacement. Surgically, it may be better to opt for a shorter array because it is less likely for misplacement with the electrode in a false route. Secondly, the surgeon has to consider the insertion angles of cochlear access very strictly to avoid misplacement along the inner ear canal. Genetic results in well describes genotype-phenotype correlations are a strong clinical tool and as in this case guided surgical planning and robotic execution.
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Affiliation(s)
- Ahmet M. Tekin
- Department of Otorhinolaryngology, Head and Neck Surgery, Brussels Health Campus, Vrije Universiteit Brussel, 1090 Brussels, Belgium; (A.M.T.); (M.M.)
| | - Marco Matulic
- Department of Otorhinolaryngology, Head and Neck Surgery, Brussels Health Campus, Vrije Universiteit Brussel, 1090 Brussels, Belgium; (A.M.T.); (M.M.)
| | - Wim Wuyts
- Center of Medical Genetics, Faculty of Medicine and Health Sciences, University of Antwerp and Antwerp University Hospital, 2650 Antwerp, Belgium;
| | | | - Griet Mertens
- Department of Otorhinolaryngology, Head and Neck Surgery, Antwerp University Hospital, 2650 Edegem, Belgium; (G.M.); (V.v.R.); (P.v.d.H.)
- Department of Translational Neurosciences, Faculty of Medicine and Health Sciences, University of Antwerp, 2610 Antwerp, Belgium
| | - Vincent van Rompaey
- Department of Otorhinolaryngology, Head and Neck Surgery, Antwerp University Hospital, 2650 Edegem, Belgium; (G.M.); (V.v.R.); (P.v.d.H.)
- Department of Translational Neurosciences, Faculty of Medicine and Health Sciences, University of Antwerp, 2610 Antwerp, Belgium
| | - Yongxin Li
- Department of Otolaryngology, Head and Neck Surgery, Capital Medical University, Beijing 100730, China;
| | - Paul van de Heyning
- Department of Otorhinolaryngology, Head and Neck Surgery, Antwerp University Hospital, 2650 Edegem, Belgium; (G.M.); (V.v.R.); (P.v.d.H.)
- Department of Translational Neurosciences, Faculty of Medicine and Health Sciences, University of Antwerp, 2610 Antwerp, Belgium
| | - Vedat Topsakal
- Department of Otorhinolaryngology, Head and Neck Surgery, Brussels Health Campus, Vrije Universiteit Brussel, 1090 Brussels, Belgium; (A.M.T.); (M.M.)
- Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital UZ Brussel, Brussels Health Campus, Vrije Universiteit Brussel, 1090 Brussels, Belgium
- Correspondence: ; Tel.: +32-24776882; Fax: +32-24776880
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Jang JH, Oh J, Han JH, Park HR, Kim BJ, Lee S, Kim MY, Lee S, Oh DY, Choung YH, Choi BY. Identification of a Novel Frameshift Variant of POU3F4 and Genetic Counseling of Korean Incomplete Partition Type III Subjects Based on Detailed Genotypes. Genet Test Mol Biomarkers 2019; 23:423-427. [PMID: 31063410 DOI: 10.1089/gtmb.2018.0296] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Aim: The aim of this study was to report a novel POU Class 3 Homeobox 4 (POU3F4) variant and to provide further guidance on genetic counseling for incomplete partition (IP) type III families in the Korean population by showing two new contrasting cases in terms of genotypes and inheritance. Materials and Methods: Two consecutively recruited hearing-impaired probands with seemingly nonsyndromic features and their biological mothers were included in this study. Sanger sequencing and quantitative polymerase chain reaction (PCR) assays were performed for POU3F4. Results: A novel frameshift variant of POU3F4, c.852delC (p.Ile285Serfs*3), was identified in one of the patients. This mutation is predicted to truncate the protein within the POU homeodomain, resulting in the complete loss of the last nucleus localization signal. The proband's biological mother was also shown to be a carrier of this c.852delC (p.Ile285Serfs*3) mutant allele. A de novo genomic deletion on chromosome Xq21.2 was confirmed in another subject via quantitative PCR. This subject's biological mother, however, was not a carrier of this deletion. This indicates that the large upstream deletion of POU3F4 in the second proband occurred de novo. This finding is compatible with the previously proposed tendency for a high de novo rate of large genomic deletions involving the X-linked deafness-2 (DFNX2) locus. Conclusion: This study adds a novel, probably pathogenic POU3F4 truncation variant to the literature and provides guidance toward effective genetic counseling for IP III subjects based on more frequent de novo occurrence of POU3F4 deletions than POU3F4 point variants.
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Affiliation(s)
- Jeong Hun Jang
- 1 Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Jayoung Oh
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Jin Hee Han
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Hye-Rim Park
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Bong Jik Kim
- 3 Department of Otolaryngology-Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, Korea
| | - Sejoon Lee
- 4 Precision Medicine Center, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Min Young Kim
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Seungmin Lee
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Doo-Yi Oh
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Yun-Hoon Choung
- 1 Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Byung Yoon Choi
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.,5 Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, Korea
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Su Y, Gao X, Huang SS, Mao JN, Huang BQ, Zhao JD, Kang DY, Zhang X, Dai P. Clinical and molecular characterization of POU3F4 mutations in multiple DFNX2 Chinese families. BMC MEDICAL GENETICS 2018; 19:157. [PMID: 30176854 PMCID: PMC6122742 DOI: 10.1186/s12881-018-0630-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 06/21/2018] [Indexed: 02/07/2023]
Abstract
Background Many X-linked non-syndromic hearing loss (HL) cases are caused by various mutations in the POU domain class 3 transcription factor 4 (POU3F4) gene. This study aimed to identify allelic variants of this gene in two Chinese families displaying X-linked inheritance deafness-2 (DFNX2) and one sporadic case with indefinite inheritance pattern. Methods Direct DNA sequencing of the POU3F4 gene was performed in these families and in 100 Chinese individuals with normal hearing. Results There are characteristic imaging findings in DFNX2 Chinese families with POU3F4 mutations. The temporal bone computed tomography (CT) images of patients with DFNX2 are characterized by a thickened stapes footplate, hypoplasia of the cochlear base, absence of the bony modiolus, and dilated internal acoustic meatus (IAM) as well as by abnormally wide communication between the IAM and the basal turn of the cochlea. We identified three causative mutations in POU3F4 for three probands and their extended families. In family 1468, we observed a novel deletion mutation, c.973delT, which is predicted to result in a p.Trp325Gly amino acid frameshift. In family 2741, the mutation c.927delCTC was identified, which is predicted to result in the deletion of serine at position 310. In both families, the mutations were located in the POU homeodomain and are predicted to truncate the C-terminus of the POU domain. In the third family, a novel de novo transversion mutation (c.669 T > A) was identified in a 5-year-old boy that resulted in a nonsense mutation (p.Tyr223*). The mutation created a new stop codon and is predicted to result in a truncated POU3F4 protein. Conclusions Based on characteristic radiological findings and clinical features, POU3F4 gene mutation analysis will increase the success rate of stapes operations and cochlear implantations, and improve molecular diagnosis, genetic counseling, and knowledge of the molecular epidemiology of HL among patients with DFNX2.
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Affiliation(s)
- Yu Su
- Department of Otorhinolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, 100853, People's Republic of China.,Department of Otorhinolaryngology, Hainan Branch of PLA General Hospital, Sanya, 572000, People's Republic of China
| | - Xue Gao
- Department of Otorhinolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, 100853, People's Republic of China.,Department of Otolaryngology, The General Hospital of the PLA Rocket Force, 16# Xi Wai Da Jie, Beijing, 100088, People's Republic of China
| | - Sha-Sha Huang
- Department of Otorhinolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, 100853, People's Republic of China
| | - Jing-Ning Mao
- Department of Medical Imaging, PLA 307 Hospital, Beijing, 100074, People's Republic of China
| | - Bang-Qing Huang
- Department of Otorhinolaryngology, Hainan Branch of PLA General Hospital, Sanya, 572000, People's Republic of China
| | - Jian-Dong Zhao
- Department of Otorhinolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, 100853, People's Republic of China
| | - Dong-Yang Kang
- Department of Otorhinolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, 100853, People's Republic of China
| | - Xin Zhang
- Department of Otorhinolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, 100853, People's Republic of China
| | - Pu Dai
- Department of Otorhinolaryngology, Head and Neck Surgery, PLA General Hospital, Beijing, 100853, People's Republic of China.
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Du W, Han MK, Wang DY, Han B, Zong L, Lan L, Yang J, Shen Q, Xie LY, Yu L, Guan J, Wang QJ. A POU3F4 Mutation Causes Nonsyndromic Hearing Loss in a Chinese X-linked Recessive Family. Chin Med J (Engl) 2017; 130:88-92. [PMID: 28051029 PMCID: PMC5221118 DOI: 10.4103/0366-6999.196565] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Background: The molecular genetic research showed the association between X-linked hearing loss and mutations in POU3F4. This research aimed to identify a POU3F4 mutation in a nonsyndromic X-linked recessive hearing loss family. Methods: A series of clinical evaluations including medical history, otologic examinations, family history, audiologic testing, and a high-resolution computed tomography scan were performed for each patient. Bidirectional sequencing was carried out for all polymerase chain reaction products of the samples. Moreover, 834 controls with normal hearing were also tested. Results: The pedigree showed X-linkage recessive inheritance pattern, and pathogenic mutation (c.499C>T) was identified in the proband and his family member, which led to a premature termination prior to the entire POU domains. This mutation co-segregated with hearing loss in this family. No mutation of POU3F4 gene was found in 834 controls. Conclusions: A nonsense mutation is identified in a family displaying the pedigree consistent with X-linked recessive pattern in POU3F4 gene. In addition, we may provide molecular diagnosis and genetic counseling for this family.
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Affiliation(s)
- Wan Du
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Ming-Kun Han
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Da-Yong Wang
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Bing Han
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Liang Zong
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Lan Lan
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Ju Yang
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Qi Shen
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Lin-Yi Xie
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Lan Yu
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Jing Guan
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
| | - Qiu-Ju Wang
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing 100853, China
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Kanno A, Mutai H, Namba K, Morita N, Nakano A, Ogahara N, Sugiuchi T, Ogawa K, Matsunaga T. Frequency and specific characteristics of the incomplete partition type III anomaly in children. Laryngoscope 2016; 127:1663-1669. [DOI: 10.1002/lary.26245] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Revised: 07/11/2016] [Accepted: 07/14/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Ayako Kanno
- Division of Hearing and Balance Research; National Institute of Sensory Organs; National Hospital Organization Tokyo Medical Center; Tokyo Japan
- Department of Otolaryngology; Inagi Municipal Hospital; Tokyo Japan
- Department of Otolaryngology; Keio University School of Medicine; Tokyo Japan
| | - Hideki Mutai
- Division of Hearing and Balance Research; National Institute of Sensory Organs; National Hospital Organization Tokyo Medical Center; Tokyo Japan
| | - Kazunori Namba
- Division of Hearing and Balance Research; National Institute of Sensory Organs; National Hospital Organization Tokyo Medical Center; Tokyo Japan
| | - Noriko Morita
- Department of Otolaryngology; Kobari General Hospital; Chiba Japan
| | - Atsuko Nakano
- Division of Otolaryngology; Chiba Children's Hospital; Chiba Japan
| | - Noboru Ogahara
- Department of Otorhinolaryngology; Kanagawa Children's Medical Center; Kanagawa Japan
| | - Tomoko Sugiuchi
- Department of Otolaryngology; Kanto Rosai Hospital; Kanagawa Japan
| | - Kaoru Ogawa
- Department of Otolaryngology; Keio University School of Medicine; Tokyo Japan
| | - Tatsuo Matsunaga
- Division of Hearing and Balance Research; National Institute of Sensory Organs; National Hospital Organization Tokyo Medical Center; Tokyo Japan
- Medical Genetics Center; National Hospital Organization Tokyo Medical Center; Tokyo Japan
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11
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Choi BY, An YH, Song JJ, Koo JW, Lee JH, Oh SH, Chang SO, Kim CS, Park JH. Clinical observations and molecular variables of patients with hearing loss and incomplete partition type III. Laryngoscope 2015; 126:E123-8. [DOI: 10.1002/lary.25573] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Revised: 05/27/2015] [Accepted: 07/23/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Bundang Hospital; Seongnam South Korea
| | - Yong-Hwi An
- Department of Otorhinolaryngology-Head and Neck Surgery; Eulji University School of Medicine; Seoul South Korea
| | - Jae-Jin Song
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Bundang Hospital; Seongnam South Korea
| | - Ja-Won Koo
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Bundang Hospital; Seongnam South Korea
| | - Jun Ho Lee
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Hospital; Seoul South Korea
| | - Seung Ha Oh
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Hospital; Seoul South Korea
| | - Sun O. Chang
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Hospital; Seoul South Korea
| | - Chong Sun Kim
- Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Hospital; Seoul South Korea
| | - Joo Hyun Park
- Department of Otorhinolaryngology-Head and Neck Surgery; Dongguk University Ilsan Hospital; Goyang South Korea
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Huang BQ, Zeng JL, Yuan YY, Dai P. A novel mutation in POU3F4 in a Chinese family with X-linked non-syndromic hearing loss. J Otol 2015; 10:78-82. [PMID: 29937786 PMCID: PMC6002573 DOI: 10.1016/j.joto.2015.09.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Objective Based on the clinical manifestations of a hearing loss patient, the POU3F4 gene was tested for diagnosis of etiology. Methods A comprehensive physical examination was performed on the proband to exclude abnormalities of other organs, and detailed audiological testing and temporal bone CT scan were also performed. Genomic DNA was extracted using the proband's peripheral blood leukocytes. Polymerase chain reactions (PCR) were performed in the coding sequence of the POU3F4 gene. Direct DNA sequencing was subsequently applied to screen the entire coding region of the POU3F4 gene. Results The proband had severe sensorineural hearing loss. Temporal CT showed bilateral cochlear incomplete partition, vestibule dysplasia, internal auditory canal fundus expansion, and cochlear interlink with the internal auditory canal fundus. A novel mutation (c.530C > A (p.S177X)) in the POU3F4 gene was found in this patient, creating an new stop codon and was predicted to result in a truncated protein lacking normal POU3F4 transcription factor function. Conclusion Through analysis of the POU3F4 gene and clinical manifestations in the patient, we conclude that a novel mutation may have resulted in a premature stop codon, contributing to the mutation of POU3F4 gene.
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Affiliation(s)
- Bang-Qing Huang
- Department of Otorhinolaryngology, Hainan Branch of PLA General Hospital, Sanya 572013, China
| | - Jia-Ling Zeng
- Department of Otorhinolaryngology, Hainan Branch of PLA General Hospital, Sanya 572013, China
| | - Yong-Yi Yuan
- Department of Otorhinolaryngology, PLA General Hospital, Beijing 100853, China
| | - Pu Dai
- Department of Otorhinolaryngology, PLA General Hospital, Beijing 100853, China
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De novo large genomic deletions involving POU3F4 in incomplete partition type III inner ear anomaly in East Asian populations and implications for genetic counseling. Otol Neurotol 2015; 36:184-90. [PMID: 24608376 DOI: 10.1097/mao.0000000000000343] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The aim of this study was to understand the prevalence and molecular genetic etiology of incomplete partition type III (IP type III) anomaly in Koreans. We also attempted to verify the prevalence of genomic deletions in the DFNX2 locus and to look for association between inheritance patterns and mutation type in East Asian IP type III subjects. STUDY DESIGN Retrospective case review. SETTING Tertiary referral center. PATIENTS Subjects with IP type III anomaly and their biological mothers. INTERVENTIONS Sanger sequencing, array-comparative genomic hybridization (aCGH), and PCR were performed. We also analyzed the type and inheritance of the causative genetic abnormality in East Asian DFNX2 patients. MAIN OUTCOME MEASURE Mutation type and occurrence. RESULTS We identified IP type III in 10 (4.8%) of 206 patients with an inner ear abnormality. We confirmed an etiologic homogeneity, DFNX2, of the IP type III in this Korean population. Two (20%) of the 10 DFNX2 carried a large genomic deletion affecting POU3F4, as proved by aCGH. PCR confirmed that the 2 deletions occurred de novo. Genetic alteration occurred de novo in 29.4% (5/17) of all reported Korean IP type III cases. From this study and literature review, we observed a striking difference of de novo occurrence rate (75% versus 12.5%, p = 0.032) between large genomic deletions and point mutations in East Asian population. CONCLUSIONS Our data suggest that different POU3F4 mutations might show different recurrence rate in siblings of the IP type III families, especially in East Asian population. Genetic counseling should be provided accordingly.
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Moteki H, Shearer AE, Izumi S, Kubota Y, Azaiez H, Booth KT, Sloan CM, Kolbe DL, Smith RJH, Usami SI. De novo mutation in X-linked hearing loss-associated POU3F4 in a sporadic case of congenital hearing loss. Ann Otol Rhinol Laryngol 2015; 124 Suppl 1:169S-76S. [PMID: 25792666 DOI: 10.1177/0003489415575042] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVES In this report, we present a male patient with no family history of hearing loss, in whom we identified a novel de novo mutation in the POU3F4 gene. METHODS One hundred ninety-four (194) Japanese subjects from unrelated and nonconsanguineous families were enrolled in this study. We used targeted genomic enrichment and massively parallel sequencing of all known nonsyndromic hearing loss genes for identifying the genetic causes of hearing loss. RESULTS A novel de novo frameshift mutation of POU3F4 to c.727_728insA (p.N244KfsX26) was identified. The patient was a 7-year-old male with congenital progressive hearing loss and inner ear deformity. Although the patient had received a cochlear implant, auditory skills were still limited. The patient also exhibited developmental delays similar to those previously associated with POU3F4 mutation. CONCLUSION This is the first report of a mutation in POU3F4 causing hearing loss in a Japanese patient without a family history of hearing loss. This study underscores the importance of comprehensive genetic testing of patients with hearing loss for providing accurate prognostic information and guiding the optimal management of patient rehabilitation.
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Affiliation(s)
- Hideaki Moteki
- Department of Otorhinolaryngology, 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 Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
| | - A Eliot Shearer
- Department of Otolaryngology-Head and Neck Surgery, Molecular Otolaryngology & Renal Research Labs, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Shuji Izumi
- Department of Otolaryngology-Head and Neck Surgery, Niigata University Faculty of Medicine, Niigata, Japan
| | - Yamato Kubota
- Department of Otolaryngology-Head and Neck Surgery, Niigata University Faculty of Medicine, Niigata, 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
| | - Christina M Sloan
- Department of Otolaryngology-Head and Neck Surgery, Molecular Otolaryngology & Renal Research Labs, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Diana L Kolbe
- Department of Otolaryngology-Head and Neck Surgery, Molecular Otolaryngology & Renal Research Labs, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - 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 Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
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Park JH, Kim NKD, Kim AR, Rhee J, Oh SH, Koo JW, Nam JY, Park WY, Choi BY. Exploration of molecular genetic etiology for Korean cochlear implantees with severe to profound hearing loss and its implication. Orphanet J Rare Dis 2014; 9:167. [PMID: 25373420 PMCID: PMC4243193 DOI: 10.1186/s13023-014-0167-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Accepted: 10/17/2014] [Indexed: 02/01/2023] Open
Abstract
Background Severe to profound sensorineural hearing loss (SNHL) requires cochlear implantation (CI) for auditory rehabilitation. Etiologic diagnoses can contribute to candidacy selection and decision-making regarding the timing of successful CI. However, few studies have been performed to address the etiologic spectrum of severe SNHL in the population where there is no consanguineous marriage and the majority of SNHL cases are sporadic in small sized families. The authors sought to comprehensively understand the etiologies of Korean cochlear implantees by incorporating the targeted resequencing of 204 candidate deafness genes (TRS-204) and a phenotype-driven candidate gene approach. Methods Ninety-three that consented to molecular genetic testing and underwent at least one molecular genetic test were included. Patients with a characteristic Phenotypic marker were subject to Sanger sequencing to detect variants in corresponding candidate genes. The rest of patients without any prominent phenotype were tested on GJB2. Next, TRS-204 was applied in GJB2-negative cases without any phenotypic marker. In addition, the sibling recurrence-risk of SNHL among families with non-diagnostic genotypes after TRS-204 was performed to gain insight of etiologies in non-diagnostic cases. Results Overall, we could find causative variants in 51 (54.8%) of the 93 cochlear implantees. Thirty (32.3%) probands could be diagnosed by direct Sanger sequencing of candidate genes selected by their phenotypes. GJB2 sequencing added 10 subjects to the group with a diagnostic genotype. TRS-204 could detect a causative variant from additional 11 cases (11.8%). We could not detect any pathogenic deletion or duplication on 204 target genes. The sibling recurrence-risk of SNHL among 42 genetically undiagnosed families with 0.03 (1/38) was significantly lower than among genetically diagnosed recessive families with 0.19 (7/37). Conclusion Despite that the majority of severe or more degree of SNHL occurs sporadically in Koreans, at least 54.8% of such cases that were willing to join the genetic study in the Korean population are monogenic Mendelian disorders with convincing causative variants. This study also indicates that a substantial portion of unsolved cases after applying our current protocol are predicted to have non-genetic or complex etiology rather than a Mendelian genetic disorder involving new genes beyond the 204 target genes. Electronic supplementary material The online version of this article (doi:10.1186/s13023-014-0167-8) contains supplementary material, which is available to authorized users.
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Imtiaz A, Kohrman DC, Naz S. A frameshift mutation in GRXCR2 causes recessively inherited hearing loss. Hum Mutat 2014; 35:618-24. [PMID: 24619944 DOI: 10.1002/humu.22545] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Accepted: 03/04/2014] [Indexed: 01/06/2023]
Abstract
More than 360 million humans are affected with some degree of hearing loss, either early or later in life. A genetic cause for the disorder is present in a majority of the cases. We mapped a locus (DFNB101) for hearing loss in humans to chromosome 5q in a consanguineous Pakistani family. Exome sequencing revealed an insertion mutation in GRXCR2 as the cause of moderate-to-severe and likely progressive hearing loss in the affected individuals of the family. The frameshift mutation is predicted to affect a conserved, cysteine-rich region of GRXCR2, and to result in an abnormal extension of the C-terminus. Functional studies by cell transfections demonstrated that the mutant protein is unstable and mislocalized relative to wild-type GRXCR2, consistent with a loss-of-function mutation. Targeted disruption of Grxcr2 is concurrently reported to cause hearing loss in mice. The structural abnormalities in this animal model suggest a role for GRXCR2 in the development of stereocilia bundles, specialized structures on the apical surface of sensory cells in the cochlea that are critical for sound detection. Our results indicate that GRXCR2 should be considered in differential genetic diagnosis for individuals with early onset, moderate-to-severe and progressive hearing loss.
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Affiliation(s)
- Ayesha Imtiaz
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
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Parzefall T, Shivatzki S, Lenz DR, Rathkolb B, Ushakov K, Karfunkel D, Shapira Y, Wolf M, Mohr M, Wolf E, Sabrautzki S, de Angelis MH, Frydman M, Brownstein Z, Avraham KB. Cytoplasmic mislocalization of POU3F4 due to novel mutations leads to deafness in humans and mice. Hum Mutat 2013; 34:1102-10. [PMID: 23606368 DOI: 10.1002/humu.22339] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Accepted: 04/08/2013] [Indexed: 11/12/2022]
Abstract
POU3F4 is a POU domain transcription factor that is required for hearing. In the ear, POU3F4 is essential for mesenchymal remodeling of the bony labyrinth and is the causative gene for DFNX2 human nonsyndromic deafness. Ear abnormalities underlie this form of deafness, characterized previously in multiple spontaneous, radiation-induced and transgenic mouse mutants. Here, we report three novel mutations in the POU3F4 gene that result in profound hearing loss in both humans and mice. A p.Gln79* mutation was identified in a child from an Israeli family, revealed by massively parallel sequencing (MPS). This strategy demonstrates the strength of MPS for diagnosis with only one affected individual. A second mutation, p.Ile285Argfs*43, was identified by Sanger sequencing. A p.Cys300* mutation was found in an ENU-induced mutant mouse, schwindel (sdl), by positional cloning. The mutation leads to a predicted truncated protein, similar to the human mutations, providing a relevant mouse model. The p.Ile285Argfs*43 and p.Cys300* mutations lead to a shift of Pou3f4 nuclear localization to the cytoplasm, demonstrated in cellular localization studies and in the inner ears of the mutant mice. The discovery of these mutations facilitates a deeper comprehension of the molecular basis of inner ear defects due to mutations in the POU3F4 transcription factor.
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Affiliation(s)
- Thomas Parzefall
- Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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Hadj-Rabia S, Callewaert BL, Bourrat E, Kempers M, Plomp AS, Layet V, Bartholdi D, Renard M, De Backer J, Malfait F, Vanakker OM, Coucke PJ, De Paepe AM, Bodemer C. Twenty patients including 7 probands with autosomal dominant cutis laxa confirm clinical and molecular homogeneity. Orphanet J Rare Dis 2013; 8:36. [PMID: 23442826 PMCID: PMC3599008 DOI: 10.1186/1750-1172-8-36] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Accepted: 02/14/2013] [Indexed: 01/15/2023] Open
Abstract
Background Elastin gene mutations have been associated with a variety of phenotypes. Autosomal dominant cutis laxa (ADCL) is a rare disorder that presents with lax skin, typical facial characteristics, inguinal hernias, aortic root dilatation and pulmonary emphysema. In most patients, frameshift mutations are found in the 3’ region of the elastin gene (exons 30-34) which result in a C-terminally extended protein, though exceptions have been reported. Methods We clinically and molecularly characterized the thus far largest cohort of ADCL patients, consisting of 19 patients from six families and one sporadic patient. Results Molecular analysis showed C-terminal frameshift mutations in exon 30, 32, and 34 of the elastin gene and identified a mutational hotspot in exon 32 (c.2262delA). This cohort confirms the previously reported clinical constellation of skin laxity (100%), inguinal hernias (51%), aortic root dilatation (55%) and emphysema (37%). Conclusion ADCL is a clinically and molecularly homogeneous disorder, but intra- and interfamilial variability in the severity of organ involvement needs to be taken into account. Regular cardiovascular and pulmonary evaluations are imperative in the clinical follow-up of these patients.
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Affiliation(s)
- Smail Hadj-Rabia
- Service de Dermatologie - Centre de référence national des Maladies Génétiques à Expression Cutanée MAGEC, INSERM U781, Hôpital Necker - Enfants Malades, Université Paris V-Descartes, 149, rue de Sèvres 75743 Paris Cedex 15, Paris, France.
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