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Genetics of deafness

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https://www.readbyqxmd.com/read/29141319/-homozygous-ectonucleotide-pyrophosphatase-phosphodiesterase-1-variants-in-a-girl-with-hypophosphatemic-rickets-and-literature-review
#1
Z Q Liu, X B Chen, F Y Song, K Gao, M F Qiu, Y Qian, M Du
Objective: To investigate the clinical features and genetic characteristics of patients with ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1) gene variants. Method: The clinical data of a patient with ENPP1 homozygous variants from Capital Institute of Pediatrics was collected, the related literature was searched from China National Knowledge Infrastructure, Wanfang Data Knowledge Service Platform, National Center from Biotechnology Information and PubMed by using search term "ENPP1" , "hypophosphatemic rickets" ...
November 2, 2017: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/29140768/public-health-burden-of-hearing-impairment-and-the-promise-of-genomics-and-environmental-research-a-case-study-in-ghana-africa
#2
Samuel Mawuli Adadey, Gordon Awandare, Goffrey Kwabla Amedofu, Ambroise Wonkam
Hearing impairment (HI) is one of the most disabling conditions of major global health burden that contributes adversely to the social and economic development of a country, if not managed properly. A proper assessment of the nationwide burden and etiology of HI is instrumental in the prevention, treatment, and management of the condition. This article sought to perform an expert review of HI in Ghana to determine the present knowledge of its burden and possible causes of the condition. A literature search was conducted in PubMed using the following keywords: "hearing loss" OR "hearing impairment" OR "deafness" AND "Ghana...
November 2017: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/29130579/a-homozygous-deleterious-cdk10-mutation-in-a-patient-with-agenesis-of-corpus-callosum-retinopathy-and-deafness
#3
Vincent J Guen, Simon Edvardson, Nitay D Fraenkel, Aviva Fattal-Valevski, Chaim Jalas, Irene Anteby, Avraham Shaag, Talia Dor, David Gillis, Eitan Kerem, Jacqueline A Lees, Pierre Colas, Orly Elpeleg
The primary cilium is a key organelle in numerous physiological and developmental processes. Genetic defects in the formation of this non-motile structure, in its maintenance and function, underlie a wide array of ciliopathies in human, including craniofacial, brain and heart malformations, and retinal and hearing defects. We used exome sequencing to study the molecular basis of disease in an 11-year-old female patient who suffered from growth retardation, global developmental delay with absent speech acquisition, agenesis of corpus callosum and paucity of white matter, sensorineural deafness, retinitis pigmentosa, vertebral anomalies, patent ductus arteriosus, and facial dysmorphism reminiscent of STAR syndrome, a suspected ciliopathy...
November 12, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29130354/delivery-of-adeno-associated-viral-vectors-in-adult-mammalian-inner-ear-cell-subtypes-without-auditory-dysfunction
#4
Yong Tao, Mingqian Huang, Yilai Shu, Adam Ruprecht, Hongyang Wang, Yong Tang, Luk H Vandenberghe, Qiuju Wang, Guangping Gao, Wei-Jia Kong, Zheng-Yi Chen
Hearing loss, including genetic hearing loss, is one of the most common forms of sensory deficits in human with limited options of treatment. Adeno-associated virus (AAV)-mediated gene transfer has been shown to effectively recover auditory functions in mouse models of genetic deafness when delivered at neonatal stages. However, the mouse cochlea is still developing at those time points whereas in human the newborn inner ears are already fully mature. For effective gene therapy to treat genetic deafness, it is necessary to determine whether or not AAV-mediated therapy can be equally effective in the fully mature mouse inner ear without causing damages to the inner ear...
November 12, 2017: Human Gene Therapy
https://www.readbyqxmd.com/read/29112224/variants-in-cib2-cause-dfnb48-and-not-ush1j
#5
K T Booth, K Kahrizi, M Babanejad, H Daghagh, G Bademci, S Arzhangi, D Zareabdollahi, D Duman, A El-Amraoui, M Tekin, H Najmabadi, H Azaiez, R J Smith
The genetic, mutational and phenotypic spectrum of deafness-causing genes shows great diversity and pleiotropy. The best examples are the group of genes, which when mutated can either cause non-syndromic hearing loss (NSHL) or the most common dual sensory impairment, Usher Syndrome (USH). Variants in the CIB2 gene have been previously reported to cause of hearing loss at the DFNB48 locus and deaf-blindness at the USH1J locus. In this study, we characterize the phenotypic spectrum in a multiethnic cohort with autosomal recessive non-syndromic hearing loss (ARNSHL) due to variants in the CIB2 gene...
November 7, 2017: Clinical Genetics
https://www.readbyqxmd.com/read/29110737/a-microdeletion-in-the-grhl2-gene-in-two-unrelated-patients-with-congenital-fibrosis-of-the-extra-ocular-muscles
#6
Khaled K Abu-Amero, Altaf A Kondkar, Arif O Khan
OBJECTIVE: Congenital fibrosis of the extraocular muscles type 1 (CFEOM1) is known to be caused by mutations in KIF21A or TUBB3 or other known genes (SALL4, CHN1, HOXA1). However, affected children may harbor other genetic defects. Therefore, a candidate gene analysis (KIF21A, TUBB3 SALL4, CHN1, HOXA1) and a high-resolution array comparative genomic hybridization (arrayCGH) was performed in two unrelated children with sporadic CFEOM1. RESULTS: Two unrelated Saudi patients did not have any mutation(s) after sequencing the full coding regions of SALL4, CHN1, HOXA1, and TUBB3 genes; and exons 8, 20, and 21 of the KIF21A gene...
November 6, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29106882/gjb2-mutations-genotypic-and-phenotypic-correlation-in-a-cohort-of-690-hearing-impaired-patients-toward-a-new-mutation
#7
Jean-Christophe Leclère, Marie-Suzanne Le Gac, Cedric Le Maréchal, Claude Ferec, Rémi Marianowski
OBJECTIVES: To analyze the clinical features of hearing impairment and to search for correlations with the genotype in patients with GJB2 mutations. DESIGN: Case series. SETTING: Collaborative study in referral centers, institutional practice. PATIENTS: A total of 690 hearing-impaired patients were genotypically and phenotypically described. The mutations of GJB2 and GJB6 were studied. Heterozygous patients were searched for another mutation by microsatellite approach...
November 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29106878/the-relationship-between-the-gjb3-c-538c-t-variant-and-hearing-phenotype-in-the-chinese-population
#8
Shasha Huang, Bangqing Huang, Guojian Wang, Dong Yang Kang, Xin Zhang, Xiaoxiao Meng, Pu Dai
BACKGROUND: Mutations in GJB3 were originally shown to underlie an autosomal dominant form of non-syndromic deafness in Chinese patients and the c.538C>T (p.R180*) variants caused high-frequency hearing loss. But after that, few reports have reported this mutation. This study investigated the relationship between the GJB3 c.538C>T variant and hearing phenotype in Chinese to assist with risk assessment and genetic counseling for hearing loss patients and their families. METHOD: The study enrolled 5700 patients with hearing loss and 4600 normal subjects...
November 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29106856/genetic-analysis-of-a-chinese-family-with-members-affected-with-usher-syndrome-type-ii-and-waardenburg-syndrome-type-iv
#9
Xueling Wang, Xiao-Jiang Lin, Xiangrong Tang, Yong-Chuan Chai, De-Hong Yu, Dong-Ye Chen, Hao Wu
AIMS: The purpose of this study was to identify the genetic causes of a family presenting with multiple symptoms overlapping Usher syndrome type II (USH2) and Waardenburg syndrome type IV (WS4). METHODS: Targeted next-generation sequencing including the exon and flanking intron sequences of 79 deafness genes was performed on the proband. Co-segregation of the disease phenotype and the detected variants were confirmed in all family members by PCR amplification and Sanger sequencing...
November 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29089220/-genetic-hearing-loss
#10
Lei Tanaka-Ouyang, Sandrine Marlin, Jérôme Nevoux
Deafness is the most common sensory disability in developed countries affecting more than 2 births in 1000. Eighty percent of congenital deafness is genetic. Universal newborn hearing screening has been in place since 2012 in France. All genetic hearing losses are not congenital and all congenital hearing losses are not genetic. Genetic hearing loss may be syndromic (associated with other symptoms) (10 %) or non-syndromic (isolated) (90 %). Hearing loss may initially be the only symptom of syndromic deafness...
October 28, 2017: La Presse Médicale
https://www.readbyqxmd.com/read/29073906/hdr-syndrome-with-a-novel-mutation-in-gata3-mimicking-a-congenital-x-linked-stapes-gusher-a-case-report
#11
Aram Yang, Jinsup Kim, Chang-Seok Ki, Sung Hwa Hong, Sung Yoon Cho, Dong-Kyu Jin
BACKGROUND: Hypoparathyroidism, sensorineural hearing loss, and renal disease (HDR) syndrome, also known as Barakat syndrome, is a rare genetic disorder with high phenotypic heterogeneity caused by haploinsufficiency of the GATA3 gene on chromosome 10p14-p15. For these reasons, the diagnosis of HDR syndrome is challenging and requires a high index of suspicion as well as genetic analysis. CASE PRESENTATION: A 14-month-old boy, with sensorineural hearing loss in both ears, showed typical radiological features of X-linked stapes gusher on preoperative temporal bone computed tomography (CT) for cochlear implantations...
October 26, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/29073893/activity-dependent-formation-of-a-vesicular-inhibitory-amino-acid-transporter-gradient-in-the-superior-olivary-complex-of-nmri-mice
#12
Lena Ebbers, Maren Weber, Hans Gerd Nothwang
BACKGROUND: In the mammalian superior olivary complex (SOC), synaptic inhibition contributes to the processing of binaural sound cues important for sound localization. Previous analyses demonstrated a tonotopic gradient for postsynaptic proteins mediating inhibitory neurotransmission in the lateral superior olive (LSO), a major nucleus of the SOC. To probe, whether a presynaptic molecular gradient exists as well, we investigated immunoreactivity against the vesicular inhibitory amino acid transporter (VIAAT) in the mouse auditory brainstem...
October 26, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/29072634/the-analysis-of-a-frequent-tmprss3-allele-containing-p-v116m-and-p-v291l-in-a-cis-configuration-among-deaf-koreans
#13
Ah Reum Kim, Juyong Chung, Nayoung K D Kim, Chung Lee, Woong-Yang Park, Doo-Yi Oh, Byung Yoon Choi
We performed targeted re-sequencing to identify the genetic etiology of early-onset postlingual deafness and encountered a frequent TMPRSS3 allele harboring two variants in a cis configuration. We aimed to evaluate the pathogenicity of the allele. Among 88 cochlear implantees with autosomal recessive non-syndromic hearing loss, subjects with GJB2 and SLC26A4 mutations were excluded. Thirty-one probands manifesting early-onset postlingual deafness were sorted. Through targeted re-sequencing, we detected two families with a TMPRSS3 mutant allele containing p...
October 26, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29048736/novel-recessive-pdzd7-biallelic-mutations-in-two-chinese-families-with-non-syndromic-hearing-loss
#14
Jing Guan, Hongyang Wang, Lan Lan, Li Wang, Ju Yang, Linyi Xie, Zifang Yin, Wenping Xiong, Lidong Zhao, Dayong Wang, Qiuju Wang
Autosomal recessive non-syndromic hearing loss (ARNSHL) is a highly heterogeneous genetic condition. PDZD7 has emerged as a new genetic etiology of ARNSHL. Biallelic mutations in the PDZD7 gene have been reported in two German families, four Iranian families, and a Pakistani family with ARNSHL. The effect of PDZD7 on ARNSHL in other population has yet to be elucidated. Two Chinese ARNSHL families, each of which had two affected siblings, were included in this study. The families underwent target region capture and high-throughput sequencing to analyze the exonic, splice-site, and intronic sequences of 128 genes...
October 19, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29044474/exome-sequencing-identifies-a-novel-nonsense-mutation-of-myo6-as-the-cause-of-deafness-in-a-brazilian-family
#15
Juliana Sampaio-Silva, Ana Carla Batissoco, Rafaela Jesus-Santos, Osório Abath-Neto, Luciano Cesar Scarpelli, Patricia Yoshie Nishimura, Layla Testa Galindo, Ricardo Ferreira Bento, Jeanne Oiticica, Karina Lezirovitz
We investigated 313 unrelated subjects who presented with hearing loss to identify the novel genetic causes of this condition in Brazil. Causative GJB2/GJB6 mutations were found in 12.7% of the patients. Among the familial cases (100/313), four were selected for exome sequencing. In one case, two novel heterozygous variants were found and were predicted to be pathogenic based on bioinformatics tools, that is, p.Ser906* (MYO6) and p.Arg42Cys (GJB3). We confirmed that this nonsense MYO6 mutation segregated with deafness in this family...
October 17, 2017: Annals of Human Genetics
https://www.readbyqxmd.com/read/29043143/focal-segmental-glomerulosclerosis-associated-with-mitochondrial-disease
#16
Kenneth Lim, David Steele, Andrew Fenves, Ravi Thadhani, Eliot Heher, Amel Karaa
Primary mitochondrial diseases (MD) are complex, heterogeneous inherited diseases caused by mutations in either the mitochondrial or nuclear DNA. Glomerular diseases in MD have been reported with tRNA mutation m.3243A>G causing a syndrome of mitochondrial encephalomyopathy, lactic acidosis and stroke-like episodes (MELAS). We describe here a case of focal segmental glomerulosclerosis (FSGS) associated with a new tRNA mutation site. A 34-year-old man with a history of living related kidney transplantation, diabetes, hearing loss, and developmental delay presented to the outpatient clinic with complaints of new behavioral difficulties, worsening symptoms, and brain involvement on imaging...
2017: Clin Nephrol Case Stud
https://www.readbyqxmd.com/read/29043102/the-distribution-of-calbindin-d28k-parvalbumin-and-calretinin-immunoreactivity-in-the-inferior-colliculus-of-circling-mouse
#17
Jin-Koo Lee, Myeung Ju Kim
The circling mice with tmie gene mutation are known as an animal deafness model, which showed hyperactive circling movement. Recently, the reinvestigation of circling mouse was performed to check the inner ear pathology as a main lesion of early hearing loss. In this trial, the inner ear organs were not so damaged to cause the hearing deficit of circling (cir/cir) mouse at 18 postnatal day (P18) though auditory brainstem response data indicated hearing loss of cir/cir mice at P18. Thus, another mechanism may be correlated with the early hearing loss of cir/cir mice at P18...
September 2017: Anatomy & Cell Biology
https://www.readbyqxmd.com/read/29037160/-homozygous-and-compound-heterozygous-mutation-in-3-turkish-family-with-jervell-and-lange-nielsen-syndrome-case-reports
#18
Fahrettin Uysal, Burcu Turkgenc, Guven Toksoy, Ozlem M Bostan, Elif Evke, Oya Uyguner, Cengiz Yakicier, Hulya Kayserili, Ergun Cil, Sehime G Temel
BACKGROUND: Jervell and Lange-Nielsen syndrome (JLNS) isa recessive model of long QT syndrome which might also be related to possible hearing loss. Although the syndrome has been demonstrated to be originated from homozygous or compound heterozygous mutations in either the KCNQ1 or KCNE1 genes, additional mutations in other genetic loci should be considered, particularly in malignant course patients. CASE PRESENTATIONS: Three patients were admitted into hospital due to recurrent seizures/syncope, intrauterine and postnatal bradycardia respectively; moreover all three patients had congenital sensorineural hearing-loss...
October 16, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/29032433/diffuse-mesangial-sclerosis-in-a-pdss2-mutation-induced-coenzyme-q10-deficiency
#19
Béla Iványi, Gábor Z Rácz, Péter Gál, Kitti Brinyiczki, István Bódi, Tibor Kalmár, Zoltán Maróti, Csaba Bereczki
BACKGROUND: A 7-month-old male infant was admitted because he was suffering from nephrotic syndrome, along with encephalomyopathy, hypertrophic cardiomyopathy, clinically suspected deafness and retinitis pigmentosa, and an elevated serum lactate level. METHODS: Coenzyme Q10 supplementation was started because of the clinical suspicion of primary CoQ10 deficiency. Despite intensive efforts, he passed away 4 weeks after admission. RESULTS: The results of genetic tests, available postmortem, explored two hitherto undescribed mutations in the PDSS2 gene...
October 14, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/29031496/ischemic-stroke-in-a-patient-with-parry-romberg-syndrome
#20
Victoria Ebiana, Sandeep Singh, Shaweta Khosa, Negar Moheb, Bhavesh Trikamji, Neal M Rao, Shri K Mishra
OBJECTIVE: This study aimed to discuss a case of a patient with a known diagnosis of Parry-Romberg syndrome (PRS) presenting with ischemic stroke, the second such reported case. BACKGROUND: PRS is a rare genetic disorder with progressive hemifacial atrophy, which usually presents within the first 2 decades of life. Neurologic manifestations include trigeminal neuralgia with associated deafness, hemifacial pain with associated migraine headaches, seizures, movement disorders, and neuropsychiatric symptoms...
October 11, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
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