scholarly journals Missense Variant of Endoplasmic Reticulum Region of WFS1 Gene Causes Autosomal Dominant Hearing Loss without Syndromic Phenotype

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Jinying Li ◽  
Hongen Xu ◽  
Jianfeng Sun ◽  
Yongan Tian ◽  
Danhua Liu ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Hearing Loss ◽  
Autosomal Dominant ◽  
Low Frequency ◽  
Missense Variant ◽  
Normal Subjects ◽  
Pathogenic Variant ◽  
Chinese Family ◽  
Missense Variants ◽  
Wfs1 Gene

Objective. Genetic variants in the WFS1 gene can cause Wolfram syndrome (WS) or autosomal dominant nonsyndromic low-frequency hearing loss (HL). This study is aimed at investigating the molecular basis of HL in an affected Chinese family and the genotype-phenotype correlation of WFS1 variants. Methods. The clinical phenotype of the five-generation Chinese family was characterized using audiological examinations and pedigree analysis. Target exome sequencing of 129 known deafness genes and bioinformatics analysis were performed among six patients and four normal subjects to screen suspected pathogenic variants. We built a complete WFS1 protein model to assess the potential effects of the variant on protein structure. Results. A novel heterozygous pathogenic variant NM_006005.3 c.2020G>T (p.Gly674Trp) was identified in the WFS1 gene, located in the C-terminal domain of the wolframin protein. We further showed that HL-related WFS1 missense variants were mainly concentrated in the endoplasmic reticulum (ER) domain. In contrast, WS-related missense variants are randomly distributed throughout the protein. Conclusions. In this family, we identified a novel variant p.Gly674Trp of WFS1 as the primary pathogenic variant causing the low-frequency sensorineural HL, enriching the mutational spectrum of the WFS1 gene.

scholarly journals Mutations in the WFS1 gene are a frequent cause of autosomal dominant nonsyndromic low-frequency hearing loss in Japanese

2007 ◽  
Vol 52 (6) ◽  
pp. 510-515 ◽  
Author(s):  
Hisakuni Fukuoka ◽  
Yukihiko Kanda ◽  
Shuji Ohta ◽  
Shin-ichi Usami
Keyword(s):  
Hearing Loss ◽  
Autosomal Dominant ◽  
Low Frequency ◽  
Wfs1 Gene

scholarly journals A novel missense variant inPRKCBsegregates low-frequency hearing loss in an autosomal dominant family with Meniere’s disease

2016 ◽  
Vol 25 (16) ◽  
pp. 3407-3415 ◽  
Author(s):  
Carmen Martín-Sierra ◽  
Teresa Requena ◽  
Lidia Frejo ◽  
Steven D. Price ◽  
Alvaro Gallego-Martinez ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Autosomal Dominant ◽  
Low Frequency ◽  
Missense Variant ◽  
Meniere’S Disease ◽  
Menière’S Disease ◽  
Meniere's Disease ◽  
Ménière’S Disease ◽  
Menière's Disease ◽  
Ménière's Disease

scholarly journals A combined in silico, in vitro and clinical approach to characterise novel pathogenic missense variants in PRPF31 in retinitis pigmentosa

2018 ◽  
Author(s):  
Gabrielle Wheway ◽  
Liliya Nazlamova ◽  
Nervine Meshad ◽  
Samantha Hunt ◽  
Nicola Jackson ◽  
...  
Keyword(s):  
Retinitis Pigmentosa ◽  
In Silico ◽  
Autosomal Dominant ◽  
Missense Variant ◽  
Incomplete Penetrance ◽  
Clinical Approach ◽  
Loss Of Function ◽  
Autosomal Dominant Retinitis Pigmentosa ◽  
Missense Variants

AbstractAt least six different proteins of the spliceosome, including PRPF3, PRPF4, PRPF6, PRPF8, PRPF31 and SNRNP200, are mutated in autosomal dominant retinitis pigmentosa (adRP). These proteins have recently been shown to localise to the base of the connecting cilium of the retinal photoreceptor cells, elucidating this form of RP as a retinal ciliopathy. In the case of loss-of-function variants in these genes, pathogenicity can easily be ascribed. In the case of missense variants, this is more challenging. Furthermore, the exact molecular mechanism of disease in this form of RP remains poorly understood.In this paper we take advantage of the recently published cryo EM-resolved structure of the entire human spliceosome, to predict the effect of a novel missense variant in one component of the spliceosome; PRPF31, found in a patient attending the genetics eye clinic at Bristol Eye Hospital. Monoallelic variants in PRPF31 are a common cause of autosomal dominant retinitis pigmentosa (adRP) with incomplete penetrance. We use in vitro studies to confirm pathogenicity of this novel variant PRPF31 c.341T>A, p.Ile114Asn.This work demonstrates how in silico modelling of structural effects of missense variants on cryo-EM resolved protein complexes can contribute to predicting pathogenicity of novel variants, in combination with in vitro and clinical studies. It is currently a considerable challenge to assign pathogenic status to missense variants in these proteins.

scholarly journals A Novel Missense Variant in the Gene PPP2R5D Causes a Rare Neurodevelopmental Disorder with Increased Phenotype

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Lulu Yan ◽  
Ru Shen ◽  
Zongfu Cao ◽  
Chunxiao Han ◽  
Yuxin Zhang ◽  
...  
Keyword(s):  
De Novo ◽  
Genetic Disorder ◽  
Neurodevelopmental Disorder ◽  
Three Dimensional ◽  
Missense Variant ◽  
Pathogenic Variant ◽  
Dimensional Structure ◽  
Chinese Family ◽  
Speech Impairment ◽  
Pathogenic Variants

PPP2R5D-related neurodevelopmental disorder, which is mainly caused by de novo missense variants in the PPP2R5D gene, is a rare autosomal dominant genetic disorder with about 100 patients and a total of thirteen pathogenic variants known to exist globally so far. Here, we present a 24-month-old Chinese boy with developmental delay and other common clinical characteristics of PPP2R5D-related neurodevelopmental disorder including hypotonia, macrocephaly, intellectual disability, speech impairment, and behavioral abnormality. Trio-whole exome sequencing (WES) and Sanger sequencing were performed to identify the causal gene variant. The pathogenicity of the variant was evaluated using bioinformatics tools. We identified a novel pathogenic variant in the PPP2R5D gene (c.620G>T, p.Trp207Leu). The variant is located in the variant hotspot region of this gene and is predicted to cause PPP2R5D protein dysfunction due to an increase in local hydrophobicity and unstable three-dimensional structure. We report a novel pathogenic variant of PPP2R5D associated with PPP2R5D-related neurodevelopmental disorder from a Chinese family. Our findings expanded the phenotypic and mutational spectrum of PPP2R5D-related neurodevelopmental disorder.

scholarly journals Exome sequencing identifies a novel CEACAM16 mutation associated with autosomal dominant nonsyndromic hearing loss DFNA4B in a Chinese family

2015 ◽  
Vol 60 (3) ◽  
pp. 119-126 ◽  
Author(s):  
Honghan Wang ◽  
Xinwei Wang ◽  
Chufeng He ◽  
Haibo Li ◽  
Jie Qing ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Exome Sequencing ◽  
Autosomal Dominant ◽  
Chinese Family ◽  
Nonsyndromic Hearing Loss

A mutation in Wolfram syndrome type 1 gene in a Japanese family with autosomal dominant low-frequency sensorineural hearing loss

2005 ◽  
Vol 125 (11) ◽  
pp. 1189-1194 ◽  
Author(s):  
Yoshihiro Noguchi ◽  
Takatoshi Yashima ◽  
Akio Hatanaka ◽  
Masamichi Uzawa ◽  
Michio Yasunami ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Autosomal Dominant ◽  
Low Frequency ◽  
Wolfram Syndrome ◽  
Sensorineural Hearing ◽  
Syndrome Type ◽  
Japanese Family

scholarly journals Heterozygous FMN2 Missense Variant Found in A Family Case of Premature Ovarian Insufficiency

2021 ◽  
Author(s):  
Jie Li ◽  
Tianliu Peng ◽  
Le Wang ◽  
Panpan Long ◽  
Ruping Quan ◽  
...  
Keyword(s):  
Exome Sequencing ◽  
Low Frequency ◽  
Missense Variant ◽  
Sporadic Case ◽  
Premature Ovarian Insufficiency ◽  
Chinese Family ◽  
Ovarian Insufficiency ◽  
Mutant Type ◽  
Pathogenic Genes ◽  
Whole Exome

Abstract Background Premature Ovarian Insufficiency plagues 1% of women under 40, while quite a few remain an unknown cause. The development of sequencing has helped find pathogenic genes and reveal the relationship between DNA repair and ovarian reserve. Through the exome sequencing, our study targets screening out the possible POI pathogenic gene and variants in a Chinese family and 20 sporadic POI patients, preliminarily exploring the functional impact and finding out potential linkages between the gene and POI. Results The whole exome sequencing suggested a novel FMN2 heterozygous variant c.1949C > T (p.Ser650Leu) carried by all three patients in a Chinese family and another c.1967G > A(p.Arg656His) variant in a sporadic case. Since no FMN2 missense mutation is reported for causing human POI, we preliminarily assessed p.Ser650Leu variant via cross-species alignment and 3D modeling and found it possibly deleterious. A series of functional evidence was consistent with our hypothesis. We proved the expression of FMN2 in different stages of oocytes and observed a statistical difference of chromosomal breakages between the POI patient carrying p.Arg656His variant and the health control (p = 0.0013). Western Blot also suggested a decrease in FMN2 and P21 in the mutant type and an associated increase in H2AX. The p.Arg656His variant with an extremely low frequency also indicated that the gene FMN2 might play an essential role in the genetic etiology of POI. To the best of our knowledge, this is the first POI report on missense variants of FMN2. Conclusion This finding indicates a novel gene possibly related to POI and sheds lights on the study of FMN2.

scholarly journals The mitochondrial COI/tRNASER(UCN) G7444A mutation may be associated with hearing impairment in a Han Chinese family

2017 ◽  
Vol 20 (2) ◽  
pp. 43-49
Author(s):  
Y Ding ◽  
B-H Xia ◽  
Y-S Teng ◽  
G-C Zhuo ◽  
J-H Leng
Keyword(s):  
Hearing Loss ◽  
Mitochondrial Genome ◽  
Age At Onset ◽  
Han Chinese ◽  
Pathogenic Variant ◽  
Chinese Family ◽  
12S Rrna ◽  
Pathogenic Variants ◽  
Functional Variants ◽  
High Penetrance

Abstract Variations in mitochondrial genome have been found to be associated with hearing loss. Of these, the mitochondrial 12S rRNA and tRNASer(UCN) are the hot-spots for pathogenic variants associated with deafness. To understand the putative role of mitochondrial DNA (mtDNA) variants in hearing loss, we recently screened the variants in mitochondrial genomes in patients with deafness from the Hangzhou area of Zhejiang Province, People’s Republic of China (PRC). In this study, we describe a maternally-inherited Han Chinese family with high penetrance of hearing loss, notably, the penetrance of hearing loss in this family were 80.0 and 40.0%, when the aminoglycoside was included or excluded. Three matrilineal relatives in this pedigree exhibited different levels of hearing loss with different age at onset. In addition, sequence analysis of the complete mitochondrial genome showed the presence of the well-known C1494T pathogenic variant in the 12S rRNA gene and the G7444A pathogenic variant in the COI/ tRNASer(UCN). The C1494T anomaly had been reported to be a pathogenic mutation associated with aminoglycoside-induced and nonsyndromic hearing loss (AINHL), while the G7444A was considered as a secondary mutation associated with deafness. However, the lack of functional variants in GJB2 and TRMU genes suggested that nuclear modified genes may not play important roles in deafness expression. Thus, the combination of G7444A and C1494T pathogenic variants in the mitochondrial genome may account for the high penetrance of hearing loss in this Chinese family.

scholarly journals Case Report: Novel Heterozygous DFNA5 Splicing Variant Responsible for Autosomal Dominant Non-syndromic Hearing Loss in a Chinese Family

2020 ◽  
Vol 11 ◽  
Author(s):  
Xi Chen ◽  
Bao-Long Jia ◽  
Mei-Hui Li ◽  
Yuan Lyu ◽  
Cai-Xia Liu
Keyword(s):  
Hearing Loss ◽  
Case Report ◽  
Autosomal Dominant ◽  
Chinese Family ◽  
Splicing Variant ◽  
Syndromic Hearing Loss

A COL4A5 Missense Variant in a Han-Chinese Family with X-linked Alport Syndrome

2019 ◽  
Vol 19 (10) ◽  
pp. 758-765
Author(s):  
Yuan Wu ◽  
Yi Guo ◽  
Jinzhong Yuan ◽  
Hongbo Xu ◽  
Yong Chen ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Sanger Sequencing ◽  
Alport Syndrome ◽  
Genetic Defect ◽  
Missense Variant ◽  
Han Chinese ◽  
Chinese Family ◽  
Chain Gene ◽  
Renal Disorder ◽  
The Family

Background: Alport syndrome (AS) is an inherited familial nephropathy, characterized by progressive hematuric nephritis, bilateral sensorineural hypoacusis and ocular abnormalities. X-linked AS (XLAS) is the major AS form and is clinically heterogeneous, and it is associated with defects in the collagen type IV alpha 5 chain gene (COL4A5). Objective: The purpose of this research is to detect the genetic defect responsible for renal disorder in a 3-generation Han-Chinese pedigree. Methods: Detailed family history and clinical data of the family members were collected and recorded. Whole exome sequencing (WES) was applied in the proband to screen potential genetic variants, and then Sanger sequencing was used to verify the variant within the family. Two hundred unrelated ethnically matched normal individuals (male/female: 100/100, age 37.5 ± 5.5 years) without renal disorder were recruited as controls. Results: Three patients (I:1, II:1 and II:2) presented microscopic hematuria and proteinuria, and the patient I:1 developed uremia and end stage renal disease (ESRD) by age 55 and showed sensorineural hearing loss. Patient II:2 developed mild left ear hearing loss. Cataracts were present in patients I:1 and II:1. A COL4A5 gene missense variant, c.2156G>A (p.G719E), located in the Gly-X-Y repeats of exon 28, was identified to co-segregate with the renal disorder in this family. The variant was absent in 200 ethnically matched controls. Conclusion: By conducting WES and Sanger sequencing, a COL4A5 missense variant, c.2156G>A (p.G719E), was identified to co-segregate with the renal disorder, and it is possible that this variant is the genetic cause of the disorder in this family. Our study may extend the mutation spectrum of XLAS and may be useful for genetic counseling of this family. Further functional studies associated with genetic deficiency are warranted in the following research.

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