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Exome sequencing, hearing loss

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https://www.readbyqxmd.com/read/29343804/compound-heterozygous-spata5-variants-in-four-families-and-functional-studies-of-spata5-deficiency
#1
Sanna Puusepp, Reka Kovacs-Nagy, Bader Alhaddad, Matthias Braunisch, Georg F Hoffmann, Urania Kotzaeridou, Lucia Lichvarova, Mailis Liiv, Christine Makowski, Merle Mandel, Thomas Meitinger, Sander Pajusalu, Richard J Rodenburg, Dzhamilja Safiulina, Tim M Strom, Inga Talvik, Annika Vaarmann, Callum Wilson, Allen Kaasik, Tobias B Haack, Katrin Õunap
Variants in the SPATA5 gene were recently described in a cohort of patients with global developmental delay, sensorineural hearing loss, seizures, cortical visual impairment and microcephaly. SPATA5 protein localizes predominantly in the mitochondria and is proposed to be involved in mitochondrial function and brain developmental processes. However no functional studies have been performed. This study describes five patients with psychomotor developmental delay, microcephaly, epilepsy and hearing impairment, who were thought clinically to have a mitochondrial disease with subsequent whole-exome sequencing analysis detecting compound heterozygous variants in the SPATA5 gene...
January 17, 2018: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/29336640/novel-rnaset2-pathogenic-variants-in-an-east-asian-child-with-delayed-psychomotor-development
#2
Yan Sun, Xuyun Hu, Jiqing Song, Yanyan Hu, Caihong Liu, Guimei Li
INTRODUCTION: RNASET2 mutation has been reported in patients with cystic leukoencephalopathy without megalencephaly and the Aicardi-Goutieres syndrome. Both disorders are Mendelian mimics of congenital cytomegalovirus infection with overlapping features, including leukoencephalopathy, white matter alterations, intracranial calcification, delayed psychomotor development, intelligence disability and seizures. Only eight families with RNASET2 mutation have been previously reported. METHODS: Whole exome sequencing was performed and copy number variants were described by read-depth strategy...
January 16, 2018: Fetal and Pediatric Pathology
https://www.readbyqxmd.com/read/29300383/genetic-analysis-of-charge-syndrome-identifies-overlapping-molecular-biology
#3
Amanda Moccia, Anshika Srivastava, Jennifer M Skidmore, John A Bernat, Marsha Wheeler, Jessica X Chong, Deborah Nickerson, Michael Bamshad, Margaret A Hefner, Donna M Martin, Stephanie L Bielas
PurposeCHARGE syndrome is an autosomal-dominant, multiple congenital anomaly condition characterized by vision and hearing loss, congenital heart disease, and malformations of craniofacial and other structures. Pathogenic variants in CHD7, encoding adenosine triphosphate-dependent chromodomain helicase DNA binding protein 7, are present in the majority of affected individuals. However, no causal variant can be found in 5-30% (depending on the cohort) of individuals with a clinical diagnosis of CHARGE syndrome...
January 4, 2018: Genetics in Medicine: Official Journal of the American College of Medical Genetics
https://www.readbyqxmd.com/read/29300381/a-homozygous-founder-missense-variant-in-arylsulfatase-g-abolishes-its-enzymatic-activity-causing-atypical-usher-syndrome-in-humans
#4
Samer Khateb, Björn Kowalewski, Nicola Bedoni, Markus Damme, Netta Pollack, Ann Saada, Alexey Obolensky, Tamar Ben-Yosef, Menachem Gross, Thomas Dierks, Eyal Banin, Carlo Rivolta, Dror Sharon
PurposeWe aimed to identify the cause of disease in patients suffering from a distinctive, atypical form of Usher syndrome.MethodsWhole-exome and genome sequencing were performed in five patients from three families of Yemenite Jewish origin, suffering from distinctive retinal degeneration phenotype and sensorineural hearing loss. Functional analysis of the wild-type and mutant proteins was performed in human fibrosarcoma cells.ResultsWe identified a homozygous founder missense variant, c.133G>T (p.D45Y) in arylsulfatase G (ARSG)...
January 4, 2018: Genetics in Medicine: Official Journal of the American College of Medical Genetics
https://www.readbyqxmd.com/read/29287879/a-novel-splicing-mutation-in-smpx-is-linked-to-nonsyndromic-progressive-hearing-loss
#5
Zhijie Niu, Denise Yan, Sara Bressler, Lingyun Mei, Yong Feng, Xuezhong Liu
OBJECTIVE: X-linked nonsyndromic hearing impairment is the rarest form of genetic hearing loss and represents only a minor fraction of all cases. The aim of this study was to investigate the cause of X-linked nonsyndromic sensorineural hearing loss in a three-generation American family. METHODS: Whole-exome sequencing and co-segregation analysis were used to identify disease-causing genes. RESULTS: In this study, we described in detail the clinical characteristics of the family and identified a novel frameshift mutation creating a premature stop codon (c...
January 2018: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29287867/slc52a2-mutations-cause-scabd2-phenotype-a-second-report
#6
Mojgan Babanejad, Omid Ali Adeli, Nooshin Nikzat, Maryam Beheshtian, Hakimeh Azarafra, Farnaz Sadeghnia, Marzieh Mohseni, Hossein Najmabadi, Kimia Kahrizi
INTRODUCTION: Autosomal recessive cerebellar ataxias (ARCAs) are a large group of neurodegenerative disorders that manifest mainly in children and young adults. Most ARCAs are heterogeneous with respect to age at onset, severity of disease progression, and frequency of extracerebellar and systemic signs. METHODS: The phenotype of a consanguineous Iranian family was characterized using clinical testing and pedigree analysis. Whole-exome sequencing was used to identify the disease-causing gene in this family...
January 2018: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29280744/update-on-the-genetics-of-idiopathic-hypogonadotropic-hypogonadism
#7
A Kemal Topaloğlu
Traditionally, idiopathic hypogonadotropic hypogonadism (IHH) is divided into two major categories: Kallmann syndrome (KS) and normosmic IHH (nIHH). To date, inactivating variants in more than 50 genes have been reported to cause IHH. These mutations are estimated to account for up to 50% of all apparently hereditary cases. Identification of further causative gene mutations is expected to be more feasible with the increasing use of whole exome/genome sequencing. Presence of more than one IHH-associated mutant gene in a given patient/pedigree (oligogenic inheritance) is seen in 10-20% of all IHH cases...
December 27, 2017: Journal of Clinical Research in Pediatric Endocrinology
https://www.readbyqxmd.com/read/29258540/whole-exome-sequencing-identified-a-missense-mutation-in-wfs1-causing-low-frequency-hearing-loss-a-case-report
#8
Hye Ji Choi, Joon Suk Lee, Seyoung Yu, Do Hyeon Cha, Heon Yung Gee, Jae Young Choi, Jong Dae Lee, Jinsei Jung
BACKGROUND: Low-frequency nonsyndromic hearing loss (LF-NSHL) is a rare, inherited disorder. Here, we report a family with LF-NSHL in whom a missense mutation was found in the Wolfram syndrome 1 (WFS1) gene. CASE PRESENTATION: Family members underwent audiological and imaging evaluations, including pure tone audiometry and temporal bone computed tomography. Blood samples were collected from two affected and two unaffected subjects. To determine the genetic background of hearing loss in this family, genetic analysis was performed using whole-exome sequencing...
December 19, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/29198720/mutations-in-tubb4b-cause-a-distinctive-sensorineural-disease
#9
Romain Luscan, Sabrina Mechaussier, Antoine Paul, Guoling Tian, Xavier Gérard, Sabine Defoort-Dellhemmes, Natalie Loundon, Isabelle Audo, Sophie Bonnin, Jean-François LeGargasson, Julien Dumont, Nicolas Goudin, Meriem Garfa-Traoré, Marc Bras, Aurore Pouliet, Bettina Bessières, Nathalie Boddaert, José-Alain Sahel, Stanislas Lyonnet, Josseline Kaplan, Nicholas J Cowan, Jean-Michel Rozet, Sandrine Marlin, Isabelle Perrault
Leber congenital amaurosis (LCA) is a neurodegenerative disease of photoreceptor cells that causes blindness within the first year of life. It occasionally occurs in syndromic metabolic diseases and plurisystemic ciliopathies. Using exome sequencing in a multiplex family and three simplex case subjects with an atypical association of LCA with early-onset hearing loss, we identified two heterozygous mutations affecting Arg391 in β-tubulin 4B isotype-encoding (TUBB4B). Inspection of the atomic structure of the microtubule (MT) protofilament reveals that the β-tubulin Arg391 residue contributes to a binding pocket that interacts with α-tubulin contained in the longitudinally adjacent αβ-heterodimer, consistent with a role in maintaining MT stability...
December 7, 2017: American Journal of Human Genetics
https://www.readbyqxmd.com/read/29198386/x-linked-glomerulopathy-due-to-col4a5-founder%C3%A2-variant
#10
Moumita Barua, Rohan John, Lorenzo Stella, Weili Li, Nicole M Roslin, Bedra Sharif, Saidah Hack, Ginette Lajoie-Starkell, Andrew L Schwaderer, Brian Becknell, Matthias Wuttke, Anna Köttgen, Daniel Cattran, Andrew D Paterson, York Pei
Alport syndrome is a rare hereditary disorder caused by rare variants in 1 of 3 genes encoding for type IV collagen. Rare variants in COL4A5 on chromosome Xq22 cause X-linked Alport syndrome, which accounts for ∼80% of the cases. Alport syndrome has a variable clinical presentation, including progressive kidney failure, hearing loss, and ocular defects. Exome sequencing performed in 2 affected related males with an undefined X-linked glomerulopathy characterized by global and segmental glomerulosclerosis, mesangial hypercellularity, and vague basement membrane immune complex deposition revealed a COL4A5 sequence variant, a substitution of a thymine by a guanine at nucleotide 665 (c...
November 29, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/29197352/whole-exome-sequencing-identifies-triobp-pathogenic-variants-as-a-cause-of-post-lingual-bilateral-moderate-to-severe-sensorineural-hearing-loss
#11
Agnieszka Pollak, Urszula Lechowicz, Victor Abel Murcia Pieńkowski, Piotr Stawiński, Joanna Kosińska, Henryk Skarżyński, Monika Ołdak, Rafał Płoski
BACKGROUND: Implementation of whole exome sequencing has provided unique opportunity for a wide screening of causative variants in genetically heterogeneous diseases, including nonsyndromic hearing impairment. TRIOBP in the inner ear is responsible for proper structure and function of stereocilia and is necessary for sound transduction. METHODS: Whole exome sequencing followed by Sanger sequencing was conducted on patients derived from Polish hearing loss family...
December 2, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/29193829/riboflavin-transporter-deficiency-mimicking-mitochondrial-myopathy-caused-by-complex-ii-deficiency
#12
Graeme A M Nimmo, Resham Ejaz, Dawn Cordeiro, Peter Kannu, Saadet Mercimek-Andrews
Biallelic likely pathogenic variants in SLC52A2 and SLC52A3 cause riboflavin transporter deficiency. It is characterized by muscle weakness, ataxia, progressive ponto-bulbar palsy, amyotrophy, and sensorineural hearing loss. Oral riboflavin halts disease progression and may reverse symptoms. We report two new patients whose clinical and biochemical features were mimicking mitochondrial myopathy. Patient 1 is an 8-year-old male with global developmental delay, axial and appendicular hypotonia, ataxia, and sensorineural hearing loss...
November 30, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29184165/atp1a3-mutations-can-cause-progressive-auditory-neuropathy-a-new-gene-of-auditory-synaptopathy
#13
Kyu-Hee Han, Doo-Yi Oh, Seungmin Lee, Chung Lee, Jin Hee Han, Min Young Kim, Hye-Rim Park, Moo Kyun Park, Nayoung K D Kim, Jaekwang Lee, Eunyoung Yi, Jong-Min Kim, Jeong-Whun Kim, Jong-Hee Chae, Seung Ha Oh, Woong-Yang Park, Byung Yoon Choi
The etiologies and prevalence of sporadic, postlingual-onset, progressive auditory neuropathy spectrum disorder (ANSD) have rarely been documented. Thus, we aimed to evaluate the prevalence and molecular etiologies of these cases. Three out of 106 sporadic progressive hearing losses turned out to manifest ANSD. Through whole exome sequencing and subsequent bioinformatics analysis, two out of the three were found to share a de novo variant, p.E818K of ATP1A3, which had been reported to cause exclusively CAPOS (cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss) syndrome...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29182774/heterozygous-ssbp1-start-loss-mutation-co-segregates-with-hearing-loss-and-the-m-1555a-g-mtdna-variant-in-a-large-multigenerational-family
#14
Peter J Kullar, Aurora Gomez-Duran, Payam A Gammage, Caterina Garone, Michal Minczuk, Zoe Golder, Janet Wilson, Julio Montoya, Sanna Häkli, Mikko Kärppä, Rita Horvath, Kari Majamaa, Patrick F Chinnery
The m.1555A>G mtDNA variant causes maternally inherited deafness, but the reasons for the highly variable clinical penetrance are not known. Exome sequencing identified a heterozygous start loss mutation in SSBP1, encoding the single stranded binding protein 1 (SSBP1), segregating with hearing loss in a multi-generational family transmitting m.1555A>G, associated with mtDNA depletion and multiple deletions in skeletal muscle. The SSBP1 mutation reduced steady state SSBP1 levels leading to a perturbation of mtDNA metabolism, likely compounding the intra-mitochondrial translation defect due to m...
November 22, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29148562/recurrence-of-reported-cdh23-mutations-causing-dfnb12-in-a-special-cohort-of-south-indian-hearing-impaired-assortative-mating-families-an-evaluation
#15
Paridhy Vanniya S, Jayasankaran Chandru, Amritkumar Pavithra, Justin Margret Jeffrey, Murugesan Kalaimathi, Rajagopalan Ramakrishnan, Natarajan P Karthikeyen, Srisailapathy C R Srikumari
Mutations in CDH23 are known to cause autosomal-recessive nonsyndromic hearing loss (DFNB12). Until now, there was only one study describing its frequency in Indian population. We screened for CDH23 mutations to identify prevalent and recurring mutations among South Indian assortative mating hearing-impaired individuals who were identified as non-DFNB1 (GJB2 and GJB6). Whole-exome sequencing was performed in individuals found to be heterozygous for CDH23 to determine whether there was a second pathogenic allele...
November 17, 2017: Annals of Human Genetics
https://www.readbyqxmd.com/read/29107558/esrp1-mutations-cause-hearing-loss-due-to-defects-in-alternative-splicing-that-disrupt-cochlear-development
#16
Alex M Rohacek, Thomas W Bebee, Richard K Tilton, Caleb M Radens, Chris McDermott-Roe, Natoya Peart, Maninder Kaur, Michael Zaykaner, Benjamin Cieply, Kiran Musunuru, Yoseph Barash, John A Germiller, Ian D Krantz, Russ P Carstens, Douglas J Epstein
Alternative splicing contributes to gene expression dynamics in many tissues, yet its role in auditory development remains unclear. We performed whole-exome sequencing in individuals with sensorineural hearing loss (SNHL) and identified pathogenic mutations in Epithelial Splicing-Regulatory Protein 1 (ESRP1). Patient-derived induced pluripotent stem cells showed alternative splicing defects that were restored upon repair of an ESRP1 mutant allele. To determine how ESRP1 mutations cause hearing loss, we evaluated Esrp1(-/-) mouse embryos and uncovered alterations in cochlear morphogenesis, auditory hair cell differentiation, and cell fate specification...
November 6, 2017: Developmental Cell
https://www.readbyqxmd.com/read/29066376/a-de-novo-mutation-in-rpl10-causes-a-rare-x-linked-ribosomopathy-characterized-by-syndromic-intellectual-disability-and-epilepsy-a-new-case-and-review-of-the-literature
#17
Danielle K Bourque, Taila Hartley, Sarah M Nikkel, Daniela Pohl, Martine Tétreault, Kristin D Kernohan, David A Dyment
Intellectual disability (ID) affects 1-2% of the general population and up to 50% of those with ID are estimated to have an underlying genetic cause. Next-generation sequencing provides an efficient means to identify the molecular causes of monogenic forms of ID. Here we present an 18 year old male with severe ID, absent speech, microcephaly, ataxia, dysmorphic facial features, and a refractory, early-onset seizure disorder. Exome sequencing revealed a rare de novo mutation in the X-linked gene RPL10 (c.232A > G, p...
October 21, 2017: European Journal of Medical Genetics
https://www.readbyqxmd.com/read/29046692/a-patient-with-van-maldergem-syndrome-with-endocrine-abnormalities-hypogonadotropic-hypogonadism-and-breast-aplasia-hypoplasia
#18
Juan Sotos, Katherine Miller, Donald Corsmeier, Naomi Tokar, Benjamin Kelly, Vijay Nadella, Huachun Zhong, Amy Wetzel, Brent Adler, Chack-Yung Yu, Peter White
BACKGROUND: We report a female patient with endocrine abnormalities, hypogonadotropic hypogonadism and amazia (breasts aplasia/hypoplasia but normal nipples and areolas) in a rare syndrome: Van Maldergem syndrome (VMS). CASE PRESENTATION: Our patient was first evaluated at age 4 for intellectual disability, craniofacial features, and auditory malformations. At age 15, she presented with no breast development and other findings consistent with hypogonadotropic hypogonadism...
2017: International Journal of Pediatric Endocrinology
https://www.readbyqxmd.com/read/29045167/identification-of-a-novel-de-novo-heterozygous-deletion-in-the-sox10-gene-in-waardenburg-syndrome-type-ii-using-next-generation-sequencing
#19
Haonan Li, Peng Jin, Qian Hao, Wei Zhu, Xia Chen, Ping Wang
OBJECTIVES: Waardenburg syndrome (WS) is a rare autosomal dominant disorder associated with pigmentation abnormalities and sensorineural hearing loss. In this study, we investigated the genetic cause of WSII in a patient and evaluated the reliability of the targeted next-generation exome sequencing method for the genetic diagnosis of WS. METHODS: Clinical evaluations were conducted on the patient and targeted next-generation sequencing (NGS) was used to identify the candidate genes responsible for WSII...
October 18, 2017: Genetic Testing and Molecular Biomarkers
https://www.readbyqxmd.com/read/29044474/exome-sequencing-identifies-a-novel-nonsense-mutation-of-myo6-as-the-cause-of-deafness-in-a-brazilian-family
#20
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
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