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Dasgupta S, Hong J, Morris R, Iqbal J, Lennox-Bowley A, Saniasiaya J. X-Linked Gusher Disease DFNX2 in Children, a Rare Inner Ear Dysplasia with Mixed Hearing and Vestibular Loss. Audiol Res 2023; 13:600-614. [PMID: 37622928 PMCID: PMC10451158 DOI: 10.3390/audiolres13040052] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 07/19/2023] [Accepted: 07/26/2023] [Indexed: 08/26/2023] Open
Abstract
Conductive hearing losses are typically present in disorders of the external/middle ear. However, there is a rare group of inner ear conditions called third windows that can also generate a conductive hearing loss. This is due to an abnormal connection between the middle and the inner ear or between the inner ear and the cranial cavity. X-linked gusher disorder is an extremely rare congenital inner ear dysplastic syndrome with an abnormal connection due to a characteristic incomplete cochlear partition type III and an incomplete internal auditory meatus fundus. The disorder is inherited in an X-linked fashion due to the mutation of the POU3F4 gene. We present two siblings diagnosed with the condition and their long-term follow-ups. They both presented audiovestibular symptoms and showed progressive mixed losses and bilateral vestibular weakness. They were treated with cochlear implant, digital amplification and with vestibular rehabilitation. Significant others around them were involved in their journey with the medical team, and in both, a very favourable outcome was achieved. This is the first time that we have reported evolving audiovestibular function with vestibular quantification in X-linked gusher disorder and emphasize on the multidisciplinary holistic approach to manage these children effectively.
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Affiliation(s)
- Soumit Dasgupta
- Alder Hey Children’s Hospital NHS Foundation Trust, Eaton Road, Liverpool L14 5AB, UK
- Faculty of Health and Medical Sciences, University of Liverpool, Liverpool L69 3BX, UK; (J.H.); (R.M.)
| | - James Hong
- Faculty of Health and Medical Sciences, University of Liverpool, Liverpool L69 3BX, UK; (J.H.); (R.M.)
| | - Rhyanna Morris
- Faculty of Health and Medical Sciences, University of Liverpool, Liverpool L69 3BX, UK; (J.H.); (R.M.)
| | - Javed Iqbal
- East Lancashire Hospitals NHS Trust, Burnley BB10 2PQ, UK;
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Petrova N, Tebieva I, Kadyshev V, Getoeva Z, Balinova N, Marakhonov A, Vasilyeva T, Ginter E, Kutsev S, Zinchenko R. Hereditary etiology of non-syndromic sensorineural hearing loss in the Republic of North Ossetia-Alania. PeerJ 2023; 11:e14514. [PMID: 36743950 PMCID: PMC9893906 DOI: 10.7717/peerj.14514] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 11/14/2022] [Indexed: 01/31/2023] Open
Abstract
More than 50% of congenital hearing loss is hereditary, in which the majority form is non-syndromic. In this study we estimate the most prevalent pathogenic genetic changes in an Ossetian cohort of patients. This is useful for local public health officials to promote genetic counseling of affected families with regard to high allele frequencies of prevalent pathogenic variants and assortative mating in the community of people with hearing loss. In this study, genetic heterogeneity of hereditary non-syndromic sensorineural hearing loss (NSNHL) in a cohort of 109 patients and an assessment of the frequency of two GJB2 gene pathogenic variants in a cohort of 349 healthy individuals from the populations of the Republic of North Ossetia-Alania (RNO-Alania) were assessed. The molecular genetic cause of NSNHL in the GJB2 gene in RNO-Alania was confirmed in ~30% of the cases, including ~27% in Ossetians. In Russian patients, the most frequent variant is GJB2:c.35delG (~83%). The GJB2:c.358_360delGAG variant was found to be the most frequent among Ossetians (~54%). Two genetic variants in GJB2, c.35delG and c.358_360delGAG, accounted for 91% of GJB2 pathogenic alleles in the Ossetian patients. A search for large genome rearrangements revealed etiological cause in two Ossetian patients, a deletion at the POU3F4 gene locus associated with X-linked hearing loss (type DFNX2). In another Ossetian patient, a biallelic pathogenic variant in the MYO15A gene caused hearing loss type DFNB3 was identified, and in one Russian family a heterozygous MYH14 gene variant associated with dominant NSNHL was found. Thus, the informative value of the diagnosis was ~37% among all patients with NSNHL from RNO-Alania and ~32% among the Ossetians. These estimates correspond to the literature data on the fraction of recessive genetic forms of hearing loss within the affected population. The importance of this study consists not only in the estimation of the most prevalent pathogenic genetic changes in the Ossetian cohort of patients which could be useful for the public health but also in the genetic counselling of the affected families with regard to the high allele frequencies of revealed pathogenic variants as well as to the assortative mating in community of people with hearing loss.
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Affiliation(s)
- Nika Petrova
- Research Centre for Medical Genetics, Moscow, Russian Federation
| | - Inna Tebieva
- North Ossetian State Medical Academy of the Ministry of Health of the Russian Federation, Beslan, Russian Federation,Medical and Genetic Consultation of the Republican Children’s Clinical Hospital of the Republic of North Ossetia–Alania, Vladikavkaz, Russian Federation
| | - Vitaly Kadyshev
- Research Centre for Medical Genetics, Moscow, Russian Federation
| | - Zalina Getoeva
- Pravoberezhnaya Central Clinical Hospital of the Ministry of Health of the Republic of North Ossetia–Alania, Vladikavkaz, Russian Federation
| | - Natalia Balinova
- Research Centre for Medical Genetics, Moscow, Russian Federation
| | | | | | - Evgeny Ginter
- Research Centre for Medical Genetics, Moscow, Russian Federation
| | - Sergey Kutsev
- Research Centre for Medical Genetics, Moscow, Russian Federation
| | - Rena Zinchenko
- Research Centre for Medical Genetics, Moscow, Russian Federation,N. A. Semashko National Research Institute of Public Health, Moscow, Russian Federation
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Jiang Y, Wu L, Huang S, Li P, Gao B, Yuan Y, Zhang S, Yu G, Gao Y, Wu H, Dai P. Study of complex structural variations of X-linked deafness-2 based on single-molecule sequencing. Biosci Rep 2021; 41:BSR20203740. [PMID: 33860785 DOI: 10.1042/BSR20203740] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [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] [What about the content of this article? (0)] [Affiliation(s)] [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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Giannantonio S, Agolini E, Scorpecci A, Anzivino R, Bellacchio E, Cocciadiferro D, Novelli A, Digilio MC, Marsella P. Genetic identification and molecular modeling characterization of a novel POU3F4 variant in two Italian deaf brothers. Int J Pediatr Otorhinolaryngol 2020; 129:109790. [PMID: 31786483 DOI: 10.1016/j.ijporl.2019.109790] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 11/18/2019] [Accepted: 11/19/2019] [Indexed: 11/27/2022]
Abstract
In this report, we describe a novel, probably pathogenic hemizygous variant c.870G > T (p.Lys290Asn) in the POU3F4 gene in two deaf brothers from one Italian family with identical inner ear abnormalities specific to X-linked deafness-2 (DFNX2). In addition, we performed homology modeling to predict the effect of the missense variant on the protein structure showing a possible disruption of the normal folding. The identification of pathogenic variants causing X-linked recessive deafness will improve molecular diagnosis, genetic counseling, and knowledge of the molecular epidemiology of hearing loss among Italian individuals. Taken together, we recommend preoperative gene mutation analysis in patients who have DFNX2 diagnosed on the basis of characteristic radiological findings, in order to provide with better prognostic information, the risk of recurrence, and improved rehabilitation options. Finally, the present work strengthens the hypothesis that DFNX-2 could be considered as a syndromic deafness, since mixed hearing loss is associated with other dysfunctions of the neuropsychological profile of the patients.
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Affiliation(s)
- Sara Giannantonio
- Audiology and Otosurgery Unit, "Bambino Gesù" Pediatric Hospital, Rome, Italy.
| | | | | | - Roberta Anzivino
- Audiology and Otosurgery Unit, "Bambino Gesù" Pediatric Hospital, Rome, Italy
| | | | | | - Antonio Novelli
- Genetics Unit, "Bambino Gesù" Pediatric Hospital, Rome, Italy
| | | | - Pasquale Marsella
- Audiology and Otosurgery Unit, "Bambino Gesù" Pediatric Hospital, Rome, Italy
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Anderson EA, Özütemiz C, Miller BS, Moss TJ, Nascene DR. Hypothalamic hamartomas and inner ear diverticula with X-linked stapes gusher syndrome - new associations? Pediatr Radiol 2020; 50:142-145. [PMID: 31440883 DOI: 10.1007/s00247-019-04497-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 07/06/2019] [Accepted: 08/01/2019] [Indexed: 10/26/2022]
Abstract
X-linked stapes gusher syndrome is a genetic form of deafness with distinct radiographic features on temporal bone CT. Hypothalamic hamartoma is a congenital glioneuronal anomaly of the hypothalamus. We report a potential association between these two rare anomalies that, to our knowledge, has not been reported. Two brothers presented with sensorineural hearing loss and almost identical inner ear and hypothalamic abnormalities, consistent with a diagnosis of X-linked stapes gusher syndrome and hypothalamic hamartoma. Genetic testing revealed identical mutations in the POU3F4 gene associated with X-linked stapes gusher syndrome. Furthermore, multiple vestibular diverticula were seen in both brothers, which have also not been reported with X-linked stapes gusher syndrome. This case suggests that POU3F4 mediated X-linked stapes gusher syndrome may also lead to multiple vestibular diverticula and hypothalamic hamartoma and, therefore, brain magnetic resonance imaging (MRI) could be considered in patients presenting with these inner ear findings.
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Affiliation(s)
- Emily A Anderson
- School of Medicine, University of Minnesota, 420 Delaware St. SE, Minneapolis, MN, 55455, USA.
| | - Can Özütemiz
- Department of Radiology, University of Minnesota, Minneapolis, MN, USA
| | - Bradley S Miller
- Department of Pediatrics, University of Minnesota, Minneapolis, MN, USA
| | - Timothy J Moss
- Department of Pediatrics, University of Minnesota, Minneapolis, MN, USA
| | - David R Nascene
- Department of Radiology, University of Minnesota, Minneapolis, MN, USA
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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 Med Genet 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] [What about the content of this article? (0)] [Affiliation(s)] [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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Barashkov NA, Klarov LA, Teryutin FM, Solovyev AV, Pshennikova VG, Konnikova EE, Romanov GP, Tobokhov AV, Morozov IV, Bondar AA, Posukh OL, Dzhemileva LU, Tomsky MI, Khusnutdinova EK, Fedorova SA. A novel pathogenic variant c.975G>A (p.Trp325*) in the POU3F4 gene in Yakut family (Eastern Siberia, Russia) with the X-linked deafness-2 (DFNX2). Int J Pediatr Otorhinolaryngol 2018; 104:94-97. [PMID: 29287890 DOI: 10.1016/j.ijporl.2017.11.001] [Citation(s) in RCA: 7] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Revised: 11/01/2017] [Accepted: 11/01/2017] [Indexed: 10/18/2022]
Abstract
Here, we report a novel hemizygous transition c.975G>A (p.Trp325*) in POU3F4 gene (Xq21) found in two deaf half-brothers from one Yakut family (Eastern Siberia, Russia) with identical inner ear abnormalities ("corkscrew" cochlea with an absence of modiolus) specific to X-linked deafness-2 (DFNX2). Comprehensive clinical evaluation (CT and MR-imaging, audiological and stabilometric examinations) of available members of this family revealed both already known (mixed progressive hearing loss) and additional (enlargement of semicircular canals and postural disorders) clinical DFNX2 features in affected males with c.975G>A (p.Trp325*). Moreover, mild enlargement of semicircular canals, postural abnormalities and different types of hearing thresholds were found in female carrier of this POU3F4-variant.
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Affiliation(s)
- Nikolay A Barashkov
- Department of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yakutsk, Russian Federation; Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Yakutsk, Russian Federation.
| | - Leonid A Klarov
- Department of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yakutsk, Russian Federation; Department of Radiology, Republican Hospital #1- National Medical Centre, Ministry of Public Health of the Sakha Republic, Yakutsk, Russian Federation; Institute of Medicine, M.K. Ammosov North-Eastern Federal University, Yakutsk, Russian Federation
| | - Fedor M Teryutin
- Department of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yakutsk, Russian Federation; Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Yakutsk, Russian Federation
| | - Aisen V Solovyev
- Department of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yakutsk, Russian Federation; Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Yakutsk, Russian Federation
| | - Vera G Pshennikova
- Department of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yakutsk, Russian Federation; Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Yakutsk, Russian Federation
| | - Edilia E Konnikova
- Institute of Medicine, M.K. Ammosov North-Eastern Federal University, Yakutsk, Russian Federation
| | - Georgii P Romanov
- Department of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yakutsk, Russian Federation; Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Yakutsk, Russian Federation
| | - Alexander V Tobokhov
- Institute of Medicine, M.K. Ammosov North-Eastern Federal University, Yakutsk, Russian Federation
| | - Igor V Morozov
- SB RAS Genomics Core Facility, Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation; Novosibirsk State University, Novosibirsk, Russian Federation
| | - Alexander A Bondar
- SB RAS Genomics Core Facility, Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Olga L Posukh
- Novosibirsk State University, Novosibirsk, Russian Federation; Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Lilya U Dzhemileva
- Laboratory of Human Molecular Genetics, Institute of Biochemistry and Genetics, Ufa Scientific Centre, Russian Academy of Sciences, Ufa, Russian Federation; Department of Immunology and Human Reproductive Health, Bashkir State Medical University, Ufa, Russian Federation
| | - Mikhail I Tomsky
- Department of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yakutsk, Russian Federation
| | - Elza K Khusnutdinova
- Laboratory of Human Molecular Genetics, Institute of Biochemistry and Genetics, Ufa Scientific Centre, Russian Academy of Sciences, Ufa, Russian Federation; Department of Genetics and Fundamental Medicine, Bashkir State University, Ufa, Russian Federation
| | - Sardana A Fedorova
- Department of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yakutsk, Russian Federation; Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Yakutsk, Russian Federation
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Gao J, Chen Y, Yang Y, Liang J, Xie J, Liu J, Li S, Zheng G, Xie L, Zhang R. The transcription factor Pf- POU3F4 regulates expression of the matrix protein genes Aspein and Prismalin-14 in pearl oyster (Pinctada fucata). FEBS J 2016; 283:1962-78. [PMID: 26996995 DOI: 10.1111/febs.13716] [Citation(s) in RCA: 14] [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: 11/21/2015] [Revised: 03/02/2016] [Accepted: 03/15/2016] [Indexed: 12/17/2022]
Abstract
UNLABELLED Matrix proteins play key roles in shell formation in the pearl oyster, but little is known about how these proteins are regulated. Here, two POU domain family members, Pf-POU2F1 and Pf-POU3F4, were cloned and characterized. Functional domain analysis revealed that both them have conserved POUS and POUH domains; these domains are important for transcription factor function. The tissue distributions of Pf-POU2F1 and Pf-POU3F4 mRNAs in pearl oyster revealed different expression patterns, and the expression of Pf-POU3F4 mRNA was relatively high in the mantle. The promoters of the matrix protein genes Aspein and Prismalin-14 were cloned using genome-walking PCR. Relatively high transcriptional activities of these promoters were detected in HEK-293T cells. In transient co-transfection assays, Pf-POU3F4 greatly up-regulated the promoter activities of the Aspein and Prismalin-14 genes in a dose-dependent manner. Structural integrity of Pf-POU3F4 was essential for its activation function. One region of the Aspein gene promoter, -181 to -77 bp, and two binding sites in the Prismalin-14 gene promoter, -359 to -337 bp and -100 to -73 bp, were required for activation of Pf-POU3F4. An electrophoresis mobility shift assay demonstrated that Pf-POU3F4 directly bound these sites. Pf-POU3F4 knockdown led to a decrease in Aspein and Prismalin-14 gene expression. Furthermore, expression levels for the Pf-POU3F4 gene were similar to those of the Aspein and Prismalin-14 genes during five development stages. Taken together, these results suggest that the transcription factor Pf-POU3F4 regulates expression of the matrix protein genes Aspein and Prismalin-14 in pearl oyster. DATABASE The nucleotide sequence data of Pf-POU2F1 is available in the GenBank databases under the accession number KM588196. The nucleotide sequence data of Pf-POU3F4 is available in the GenBank databases under the accession number KM519606. The nucleotide sequence data of Aspein gene promoter is available in the GenBank databases under the accession number KM519607. The nucleotide sequence data of Prismalin-14 gene promoter is available in the GenBank databases under the accession number KM519601.
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Affiliation(s)
- Jing Gao
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
| | - Yan Chen
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
| | - Yi Yang
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
| | - Jian Liang
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
| | - Jun Xie
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
| | - Jun Liu
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
| | - Shiguo Li
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
| | - Guilang Zheng
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
| | - Liping Xie
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
| | - Rongqing Zhang
- Institute of Marine Biotechnology, Collaborative Innovation Center of Deep Sea Biology, School of Life Science, Tsinghua University, Beijing, China
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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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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] [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
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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13
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Gong WX, Gong RZ, Zhao B. HRCT and MRI findings in X-linked non-syndromic deafness patients with a POU3F4 mutation. Int J Pediatr Otorhinolaryngol 2014; 78:1756-62. [PMID: 25175280 DOI: 10.1016/j.ijporl.2014.08.013] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 08/10/2014] [Accepted: 08/11/2014] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The aim of this study was to analyze HRCT and MRI findings in patients with X-linked non-syndromic deafness and a POU3f4 mutation. METHODS HRCT and MRI data of four patients (males, 2-19 years old) with a POU3f4 mutation were collected and a retrospective review was performed. Cochlea, internal auditory canal (IAC), vestibule, semicircular canals, vestibular aqueduct, nerve canals in the IAC fundus, stapes and cochlear nerve were evaluated on 2D images (multi-planner reformation, MPR) and cochlear foramen on 3D images (CT virtual endoscopy, CTVE). Ten cases with normal hearing subjected to CT and MR exams served as controls. RESULTS Inner ear malformations were bilateral and symmetrical. Cochlear malformation was shown to consist of as a relatively normal outer coat shape, absence of a cochlear modilous, and a direct intercommunication between the IAC and cochlear inner cavity. The lateral portion of the IAC was dilated. A spiral cochlear inner cavity was observed with CTVE images versus a helical cochlear nerve foramen as seen in controls. The labyrinthine facial nerve canal and superior vestibular nerve canal were enlarged. The Bill's bar was hypertrophic and partially pneumatized. A thickened stapes footplate was present and a fissura ante fenestram was absent in seven ears examined. A column shaped stapes was observed in one ear. CONCLUSIONS The absence of a cochlear modilous with a dilated lateral IAC and thickened stapes footplate were the remarkable features observed with imaging these in X-linked non-syndromic deafness patients with a POU3F4 mutation. Preoperative recognition of the image features in these patients is important because it precludes stapedectomy and indicates the risks in the surgery of cochlear implantation including CSF gusher and electrode insertion into IAC.
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Affiliation(s)
- Wu-Xian Gong
- Shandong Medical Imaging Research Institute, Shandong University, Jinan 250012, China.
| | - Ruo-Zhen Gong
- Shandong Medical Imaging Research Institute, Shandong University, Jinan 250012, China
| | - Bin Zhao
- Shandong Medical Imaging Research Institute, Shandong University, Jinan 250012, China
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Sismani C, Donoghue J, Alexandrou A, Karkaletsi M, Christopoulou S, Konstantinidou AE, Livanos P, Patsalis PC, Velissariou V. A prenatally ascertained, maternally inherited 14.8 Mb duplication of chromosomal bands Xq13.2-q21.31 associated with multiple congenital abnormalities in a male fetus. Gene 2013; 530:138-42. [PMID: 23973723 DOI: 10.1016/j.gene.2013.08.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [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: 05/23/2013] [Revised: 08/06/2013] [Accepted: 08/08/2013] [Indexed: 11/29/2022]
Abstract
Duplications of the X chromosome are rare cytogenetic findings, and have been associated with an abnormal phenotype in the male offspring of apparently normal or near normal female carriers. We report on the prenatal diagnosis of a duplication on the long arm of chromosome X from chromosomal band Xq13.2 to q21.31 in a male fetus with increased nuchal translucency in the first trimester and polyhydramnios at 22 weeks of gestation. Amniocentesis was undertaken and cytogenetic analysis revealed additional chromosomal material in the long arm of chromosome X at position Xq13. Analysis with high resolution array CGH revealed the additional material is in fact a duplication of the region Xq13.2-q21.13. The duplication is 14.8 Mb in size and includes fourteen genes: SLC16A2, KIAA2022, ABCB7, ZDHHC15, ATRX, MAGT1, ATP7A, PGK1, TBX22, BRWD3, POU3F4, ZNF711, POF1B and CHM. Analysis of the parents revealed the mother to be a carrier of the same duplication. After elected termination of the pregnancy at 28 weeks a detailed autopsy of the fetus allowed for genotype-phenotype correlations.
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Affiliation(s)
- C Sismani
- Department of Cytogenetics and Genomics, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
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