Truncated Epithelial Sodium Channel β Subunit Responsible for Liddle Syndrome in a Chinese Family.

Background/aims: Liddle syndrome (LS) is a rare autosomal dominant disease caused by mutations in genes coding for epithelial sodium channel (ENaC) subunits. The aim of this study was to identify the mutation responsible for the LS in an extended Chinese family.

Methods: DNA samples from the proband with early-onset, treatment-resistant hypertension, and hypokalemia and 19 additional relatives were all sequenced for mutations in exon 13 of the β-ENaC and γ-ENaC genes, using amplification by polymerase chain reaction and direct DNA sequencing.

A novel phenotype with splicing mutation identified in a Chinese family with desminopathy.

Background: Desminopathy, a hereditary myofibrillar myopathy, mainly results from the desmin gene (DES) mutations. Desminopathy involves various phenotypes, mainly including different cardiomyopathies, skeletal myopathy, and arrhythmia. Combined with genotype, it helps us precisely diagnose and treat for desminopathy.

Liddle syndrome misdiagnosed as primary aldosteronism resulting from a novel frameshift mutation of SCNN1B.

Liddle syndrome (LS), a monogenetic autosomal dominant disorder, is mainly characterized by early-onset hypertension and hypokalemia. Clinically, misdiagnosis or missing diagnosis is common, since clinical phenotypes of LS are variable and nonspecific. We report a family with misdiagnosis of primary aldosteronism (PA), but identify as LS with a pathogenic frameshift mutation of the epithelial sodium channel (ENaC) β subunit.

Genetic screening of SCNN1B and SCNN1G genes in early-onset hypertensive patients helps to identify Liddle syndrome.

Background: Liddle syndrome is an autosomal dominant form of monogenic hypertension. Phenotypic variability makes it difficult to identify patients with Liddle syndrome, resulting in misdiagnosis and severe complications at early age.

Objectives: To identify mutation in SCNN1B and SCNN1G genes in an adolescent with suspicious Liddle syndrome and his family members and to explore the screening target subjects of Liddle syndrome.

A novel PRKAG2 mutation in a Chinese family with cardiac hypertrophy and ventricular pre-excitation.

PRKAG2 syndrome is a rare autosomal dominant inherited disorder that is characterized by cardiac hypertrophy, ventricular pre-excitation and conduction system abnormalities. There is little knowledge in cardiovascular magnetic resonance (CMR) characteristics of PRKAG2 cardiomyopathy. This study investigated the genetic defect in a three-generation Chinese family with cardiac hypertrophy and ventricular pre-excitation using whole-exome sequencing.

Restrictive Cardiomyopathy Resulting from a Troponin I Type 3 Mutation in a Chinese Family.

Objective To identify the pathogenic variant responsible for restrictive cardiomyopathy (RCM) in a Chinese family.Methods Next generation sequencing was used for detecting the mutation and Results verified by sequencing. We used restriction enzyme digestion to test the mutation in the family members and 200 unrelated normal subjects without any cardiac inherited diseases when the mutation was identified.

Whole-exome sequencing identifies a missense mutation in hnRNPA1 in a family with flail arm ALS.

Objective: To identify the disease-causing gene of a family with upper limb predominant, slowly progressive amyotrophic lateral sclerosis (ALS), which was diagnosed as flail arm syndrome (FAS).

Methods: After causation of 24 known ALS genes was excluded by targeted next-generation sequencing, whole-exome sequencing was applied in the FAS family. Cellular localization of mutant hnRNPA1 was examined in transfected HeLa cells.

Identification of a novel loss-of-function C9orf72 splice site mutation in a patient with amyotrophic lateral sclerosis.

Abnormal expansion of a hexanucleotide GGGGCC repeat in the C9orf72 gene is the most common cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia in Caucasians. However, the underlying pathologic mechanisms remain controversial, and both loss-of-function and gain-of-function models have been proposed. To gain further insight into these mechanisms, we performed mutation analysis of C9orf72 in 276 Han Chinese patients with ALS.

A Novel Splicing Mutation Identified in a Chinese Family with X-linked Alport Syndrome Using Targeted Next-Generation Sequencing.

Aims: Alport syndrome (AS) is a genetically heterogeneous disorder, characterized by hematuria, progressive renal failure, sensorineural hearing loss, and ocular abnormalities caused by mutations in the COL4A3, COL4A4, and COL4A5 genes. The aim of this study was to identify underlying mutations in individuals from a Chinese family with X-linked AS.

Methods: We performed targeted next-generation sequencing (NGS) to identify mutations associated with AS.

Novel Phenotype-Genotype Correlations of Restrictive Cardiomyopathy With Myosin-Binding Protein C (MYBPC3) Gene Mutations Tested by Next-Generation Sequencing.

Background: MYBPC3 dysfunctions have been proven to induce dilated cardiomyopathy, hypertrophic cardiomyopathy, and/or left ventricular noncompaction; however, the genotype-phenotype correlation between MYBPC3 and restrictive cardiomyopathy (RCM) has not been established. The newly developed next-generation sequencing method is capable of broad genomic DNA sequencing with high throughput and can help explore novel correlations between genetic variants and cardiomyopathies.

Methods And Results: A proband from a multigenerational family with 3 live patients and 1 unrelated patient with clinical diagnoses of RCM underwent a next-generation sequencing workflow based on a custom AmpliSeq panel, including 64 candidate pathogenic genes for cardiomyopathies, on the Ion Personal Genome Machine high-throughput sequencing benchtop instrument.

A novel frameshift mutation of epithelial sodium channel β-subunit leads to Liddle syndrome in an isolated case.

Objective: Liddle syndrome, an autosomal dominant form of monogenic hypertension, is attributed to mutations in the genes encoding β and γ subunits (SCNN1B and SCNN1G) of the epithelial sodium channel (ENaC). The aim of this study was to search for pathogenic mutations of SCNN1B and SCNN1G in an adolescent under the impression of Liddle syndrome and no family history of hypertension.

Design And Patients: We screened the C-terminus of SCNN1B and SCNN1G in an adolescent with poorly controlled hypertension who was clinically diagnosed as having Liddle syndrome.

[Mutation in the SLC37A4 gene of glycogen storage disease type Ib in 15 families of the mainland of China].

Objective: Glycogen storage disease type Ib (GSDIb, MIM: 232220) is an autosomal recessive inborn error of metabolism caused by deficiency of the glucose-6-phosphate translocase. The clinical manifestations include symptoms and signs of both the typical GSDIa, including hepatomegaly, fasting hypoglycemia, lactic acidemia and hyperlipidemia, and the dysfunction of neutrophils of recurrent infection and neutropenia. More than 84 mutations have been identified since the discovery of the SLC37A4 gene as the disease causing gene.

[Sequence analysis of a novel human leukocyte antigen allele B*5827].

Objective: To investigate the molecular basis for a novel human leukocyte antigen (HLA) allele B*5827.

Methods: DNA from the proband was analyzed by polymerase chain reaction-sequence specific oligonucleotide (PCR-SSO) typing. The amplified product was sequenced bidirectionally.

[Diagnosis of glycogen storage disease type IIIA by detecting glycogen debranching enzyme activity, glycogen content and structure in muscle].

Objective: Glycogen storage disease type III (GSD III) is an autosomal recessive disease caused by glycogen debranching enzyme (GDE) gene (AGL gene) mutation resulting in hepatomegaly, hypoglycemia, short stature and hyperlipidemia. GSD IIIA, involves both liver and muscle, and accounts for up to 80% of GSD III. The definitive diagnosis depends on either mutation analysis or liver and muscle glycogen debranching enzyme activity tests.

[Identification of a novel TP53 germline mutation in one child with adrenocortical carcinoma].

Objective: To detect the germline TP53 gene mutation in a child with pediatric adrenocortical carcinoma (ADCC) in order to provide genetic diagnosis and counseling.

Methods: Genomic DNA was extracted from peripheral blood from a girl with ADCC and her parents. All TP53 exons and their flanking intronic sequences were PCR-amplified and subjected to automatic DNA sequencing.