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Wuhan, China

Guo Y.,Central South University | Yuan J.,Central South University | Liang H.,Central South University | Xiao J.,BGI Shenzhen | And 7 more authors.
Molecular Biology Reports | Year: 2014

Alport syndrome (AS) is an inherited disorder and clinically characterized by glomerulonephritis and end-stage kidney disease (ESRD). The aim of this study was to identify the gene responsible for glomerulopathy in a 4-generation Chinese pedigree. Exome sequencing was conducted in four patients of the family, and then direct sequencing was performed in other members of the pedigree. A novel missense mutation c.368G>A (p.Gly123Glu) in the collagen type IV alpha-5 gene (COL4A5) was found to be the genetic cause. The p.Gly123Glu mutation occurs prior to Gly-X-Y repeats in the alpha-5 chain of type IV collagen. Neither sensorineural hearing loss nor ocular abnormalities were present in patients of this family. Other clinical features, such as age of onset, age of ESRD, disease severity and complications, varied among patients of this family. Our finding may provide new insights into the cause and diagnosis of AS, and also have implications for genetic counseling. © 2014 Springer Science+Business Media. Source


Wang X.,Women and Childrens Hospital of Sichuan Province | Yang Y.,BGI Wuhan | Zhou R.,University of Sichuan
Experimental and Therapeutic Medicine | Year: 2016

A patient with progressive muscular atrophy was assessed for the disease-associated genes by next-generation sequencing technology and exon trap and sequence analysis. The results of the investigation identified 399 genes, covering all exons in addition to 10 bp on either side, which are specific to 659 types of neuromuscular disorders, including hypotypes. Exon capture and sequence analysis revealed that the patient possessed two splice site mutations in the dysferlin (DYSF) gene, c.144+1G>A and c.342+1G>T, and the presence of the mutations was confirmed by Sanger sequencing. The patient's mother and sister were also assessed and confirmed to have mutations within the DYSF gene, the mother with c.342+1G>T and the sister with c.144+1G>A. The two splice site mutations in the DYSF gene, c.144+1G>A and c.342+1G>T, have not previously been reported. Therefore, exon capture and sequence analysis is able to rapidly and efficiently screen for genetic alterations in neuromuscular disorders. © 2016, Spandidos Publications. All rights reserved. Source


Sun Y.,BGI Shenzhen | Wang L.,Huazhong University of Science and Technology | Wei X.,BGI Shenzhen | Zhu Q.,BGI Shenzhen | And 9 more authors.
Clinica Chimica Acta | Year: 2013

Background: Autosomal recessive Zellweger spectrum disorder (ZSD), the main subgroup of the peroxisome biogenesis disorders (PBDs), can be caused by mutations in any of the 13 PEX genes. Zellweger syndrome (ZS) is the most common and severe phenotype in the heterogeneous ZSD. For the large number genes involved, it is difficult to make a precise genetic diagnosis by traditional methods at a time. A combination of enrichment of targeted genes and next-generation sequencing (NGS) would result in both high efficiency and low cost for targeted sequencing of genes of interest. Methods: To identify potential mutations in a Chinese family associated with Zellweger syndrome, 1930. kb of all the targeted region of PEX genes were captured and sequenced using NGS. We also performed Sanger sequencing to validate the NGS results. Results: Here, we reported a Chinese patient diagnosed as a severe classic type of PBD based on a clinical investigation. We then performed microarray-based NGS to detect the variants in PEX genes of the whole family. One reported heterozygosis mutation (c.782_783delAA) was identified in the patient's father and one novel heterozygosis missense mutation (c.475G. >. C) was found in the patient's mother, the patient inherited both mutations. Conclusions: The results proved that the application of target sequence capture using chip and high-throughput NGS is a valuable tool for the molecular diagnosis of peroxisome biogenesis disorders. The accuracy, high-throughput and speed of the method make it suitable for clinical application. © 2012 Elsevier B.V. Source


Dai Y.,Peking Union Medical College | Wei X.,BGI Wuhan | Zhao Y.,Peking Union Medical College | Ren H.,Peking Union Medical College | And 5 more authors.
Neuromuscular Disorders | Year: 2015

Muscular dystrophies and congenital myopathies are a large group of heterogeneous inherited muscle disorders. The spectrum of muscular dystrophies and congenital myopathies extends to more than 50 diseases today, even excluding the common forms Duchenne Muscular Dystrophy, Myotonic Dystrophy and Facioscapulohumeral Dystrophy. Unfortunately, even by critical clinical evaluation and muscle pathology, diagnosis is still difficult. To potentially remediate this difficulty, we applied a microarray-based targeted next-generation sequencing (NGS) technology to diagnose these patients. There were 55 consecutive unrelated patients who underwent the test, 36 of which (65%) were found to have a causative mutation. Our result shows the accuracy and efficiency of next-generation sequencing in clinical circumstances and reflects the features and relative distribution of inherited myopathies in the Chinese population. © 2015 Elsevier B.V.. Source


Liu Y.,Jiangxi Provincial Women and Children Hospital | Wei X.,BGI Wuhan | Kong X.,Zhengzhou University | Guo X.,BGI Wuhan | And 8 more authors.
PLoS ONE | Year: 2015

Background: Targeted next-generation sequencing (NGS) is a cost-effective approach for rapid and accurate detection of genetic mutations in patients with suspected genetic disorders, which can facilitate effective diagnosis. Methodology/Principal Findings: We designed a capture array to mainly capture all the coding sequence (CDS) of 2,181 genes associated with 561 Mendelian diseases and conducted NGS to detect mutations. The accuracy of NGS was 99.95%, which was obtained by comparing the genotypes of selected loci between our method and SNP Array in four samples from normal human adults. We also tested the stability of the method using a sample from normal human adults. The results showed that an average of 97.79% and 96.72% of single-nucleotide variants (SNVs) in the sample could be detected stably in a batch and different batches respectively. In addition, the method could detect various types of mutations. Some disease-causing mutations were detected in 69 clinical cases, including 62 SNVs, 14 insertions and deletions (Indels), 1 copy number variant (CNV), 1 microdeletion and 2 microduplications of chromosomes, of which 35 mutations were novel. Mutations were confirmed by Sanger sequencing or real-time polymerase chain reaction (PCR). Conclusions/Significance: Results of the evaluation showed that targeted NGS enabled to detect disease-causing mutations with high accuracy, stability, speed and throughput. Thus, the technology can be used for the clinical diagnosis of 561 Mendelian diseases. Copyright: © 2015 Liu et al. Source

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