Analysis of gene variant in an infant with succinic semialdehyde dehydrogenase deficiency / 中华医学遗传学杂志

OBJECTIVE@#To explore the genetic basis for a child with succinate semialdehyde dehydrogenase deficiency.@*METHODS@#Peripheral blood samples of the proband and his parents were collected and subjected to Sanger sequencing. High-throughput sequencing was used to verify the gene variants. Bioinformatic software was used to analyze the pathogenicity of the variant sites.@*RESULTS@#Sanger sequencing showed that the proband carried a homozygous c.1529C>T (p.S510F) variant of the ALDH5A1 gene, for which his mother was a carrier. The same variant was not detected in his father. However, high-throughput sequencing revealed that the child and his father both had a deletion of ALDH5A1 gene fragment (chr6: 24 403 265-24 566 986).@*CONCLUSION@#The c.1529C>T variant of the ALDH5A1 gene and deletion of ALDH5A1 gene fragment probably underlay the disease in the child. High-throughput sequencing can detect site variation as well as deletion of gene fragment, which has enabled genetic diagnosis and counseling for the family.

Clinical and genetic characteristics of 2 cases with infantile GM1 gangliosidosis / 中华实用儿科临床杂志

Objective:To analyze clinical and genetic characteristics of 2 cases with infantile GM1 gang-liosidosis.Methods:Clinical data of 2 cases with infantile GM1 gangliosidosis in the Department of Rehabilitation, Tianjin Children′s Hospital from May 2019 to June 2019 were retrospectively analyzed.Results:The major manifestations of 2 cases included infantile onset, psychomotor retardation and retrogression, blundering face, sensitive to sound, gingival hyperplasia, abnormal eruption of teeth, hypotonia or dystonia, bone dysplasia, and skin abnormalities.Case 1 had hepatosplenomegaly, corneal opacity and multiple joint contractures.Case 2 had fundus cherry erythema and epileptic seizure.Biochemical results showed that alkaline phosphatase and aspartate transaminase significantly increased, and alanine transaminase was normal.Cranial nuclear magnetic imaging showed poor myelin sheath in the white matter in both cases, and case 1 also had symmetric signal changes in the thalamus.Whole exon sequencing showed that case 1 had deletion mutation of 3p22.3 (33137821-33138587)×1 in the exon of GLB1 gene, which has not been previously reported. Conclusions:The clinical spectrum of infantile GM1 gangliosidosis is broad.Both cases in this study have skin abnormalities, which are relatively rare.Multiple joint contractures in case 1 have not been previously reported, and considered as a new phenotype.The deletion mutation of 3p22.3 (33137821-33138587)×1 in the exon of GLB1 gene in case 1 is a newly detected mutation, which expands the genetic profile of infantile GM1 gangliosidosis.

Analysis of cytogenetic characteristics of 321 children with hypospadias and literature review / 中华泌尿外科杂志

Objective:To explore the cytogenetic characteristics of hypospadias in children by karyotype analysis.Methods:From June 2008 to May 2018, 45 children with hypospadias in Tianjin Children's Hospital had cytogenetic abnormalities. Their median age was 10 months(range 3 hours to 5 years old). Of the 45 cases, 20 were proximal hypospadias, 1 was middle hypospadias. All 24 cases had varying degrees of genitourinary malformations. Among them, 15 cases had unilateral or bilateral cryptorchidism, 5 cases had scrotal division, 3 cases had penile scrotal transposition, 3 cases had small penis, 3 cases had indirect inguinal hernia, 1 case had repeated urethra, 1 case had hydrocele and 1 case had concealed penis. To the other systemic malformations, there was 1 with cleft lip and palate and 1 with congenital heart disease. G-banding karyotype analysis of peripheral blood lymphocytes was performed in all 45 cases.Results:Among the 45 cases of hypospadias with abnormal karyotypes, with an abnormal rate of 14.0%, 28 cases (62.22%) had sex chromosome abnormalities, including (47, XXY), (46, XX/47, XXY), (45, X0/47, XYY), etc. Sexual inversion occurred in 8 cases (17.78%), all of which were 46, XX. There were 4 autosomal abnormalities (8.89%), including (46, XY, 9p+ ), (46, XY, 10p+ ) and (46, XY, 1q+ ). Chromosome polymorphism was found in 4 cases (8.89%), including [46, XY, inv(9)] and [46, XY, 16qh+ ], and the equilibrium translocation of 1 case (2.22%) was [45, XY, -21, -22, + t(21; 22)]. Among the 45 cases, 8 sex reversal children with (46, XX) chromosome karyotype were all proximal hypospadias.Conclusions:Children with hypospadias may be associated with chromosomal karyotype abnormalities, including sex chromosomal abnormalities, autosomal abnormalities, chromosome polymorphism and balanced translocation. Among them, sex chromosome abnormality was the most common and balanced translocation was the least.

Chronic granulomatous disease caused by compound heterozygous mutation in NCF2 gene: case report and literature review / 中华实用儿科临床杂志

Objective:To explore the relationship between the type of mutation and clinical features, prognosis, and clinical characteristics of chronic granulomatous disease (CGD) caused by compound heterozygous mutations in the NCF2 gene in children. Methods:The clinical data of 1 case of neonatal CGD caused by compound heterozygous mutations of NCF2 gene at Tianjin Children′s Hospital in August 2019 was analyzed, and domestic and international literatures were searched to summarize the clinical characteristics, gene mutation type and prognosis of CGD caused by NCF2 mutation. Results:The diagnosis of CGD was confirmed by the presence of compound heterozygous mutations c. 196_197insA (p.Arg66Glnfs23X) and c. 1180T>G (p.Tyr394Asp) in the NCF2 gene, accompanied with the clinical manifestations of fever, cough, multiple clumps and nodules in the chest CT at 25 days after birth, and the neutrophil respiratory burst test stimulation index(SI) 23.This new mutation was not reported in the Human Genetic Mutation Database.The child had a residual portion of nicotinamide adenine dinucleotide phosphate (NADPH) oxidase activity and was followed up until the age of 9 months with an antifungal drug without recurrent infection.A total of 101 cases of CGD patients with NCF2 gene mutation were reported in domestic and international databases.Totally, 33 cases had SI results, with 22 cases below 3, 11 cases above 3, and 8 cases of missense mutations. Conclusions:c. 196_197insA and c. 1180T>G are new mutations in NCF2 gene that can lead to CGD.CGD patients containing missense mutations in the NCF2 gene may have more residual NADPH oxidase activity.

Genetic analysis of 46,XY disorders of sex development in children caused by a new NR5A1 gene variant / 中华医学遗传学杂志

OBJECTIVE@#To explore the genetic basis for a child with 46,XY disorders of sex development (DSD) and explore its genotype-phenotype correlation.@*METHODS@#The child was subjected to whole exome sequencing (WES), and exons 1 to 7 of NR5A1 were subjected to multiplex ligation-dependent probe amplification (MLPA) analysis.@*RESULTS@#The patient presented with rudimentary vulva of a female with Tanner stage 1. B-mode ultrasonography has detected ovary and uterus. The child was found to have a chromosome karyotype of 46,XY. WES revealed that the patient has harbored heterozygous deletion of exon 5 of the NR5A1 gene, which was a novel pathogenic variant inherited from the mother. No abnormality was found in the father.@*CONCLUSION@#The main symptoms of 46,XY DSD children are insufficient external genitalia masculinization, for which variants of the NR5A1 gene are an important cause. WES has improved the detection rate of genetic variants and provided a solid basis for genetic counseling of the affected families.

Analysis of gene variant in a Chinese child affected with dihydropyrimidinase deficiency / 中华医学遗传学杂志

OBJECTIVE@#To analyze the molecular etiology of a Chinese child affected with dihydropyrimidinase deficiency.@*METHODS@#Genomic DNA was extracted from peripheral blood samples of the family members. Pathogenic variant was determined by whole exome sequencing and verified by Sanger sequencing.@*RESULTS@#The child was found to harbor homozygous c.905G>A (p.Arg302Gln) variants in exon 5 of the DPYS gene, for which her parents were both heterozygous carriers.@*CONCLUSION@#The homozygous c.905G>A (p.Arg302Gln) variants of the DPYS gene probably underlies the dihydropyrimidinase deficiency in the child. Above result has enabled genetic counseling and prenatal diagnosis for this family.

Genetic analysis of a child with very long chain acyl-CoA dehydrogenase deficiency / 中华医学遗传学杂志

OBJECTIVE@#To analyze the clinical and molecular characteristics of a child with very long chain acyl-CoA dehydrogenase deficiency (VLCADD).@*METHODS@#Peripheral blood sample of the patient was collected for the extraction of genomic DNA. Next generation sequencing (NGS) was carried out for the proband. Suspected mutations were validated by Sanger sequencing.@*RESULTS@#The patient, a 12-month-old girl, was admitted for diarrhea, vomiting, fever, poor spirit and decreased blood pressure. During the course of the disease, she also manifested hypertrophic cardiomyopathy, cardiogenic shock, elevated myocardial enzyme kinase, fever and metabolic acidosis, and had died after three days due to ventricular tachycardia and respiratory failure. Genetic testing showed that she has carried heterozygous mutations of of the ACADVL gene, namely c.664G>A (exon 8) and c.1056_1057del (exon 10). Blood screening for metabolic genetic diseases showed increased C12, C14, C16, C18, C14:1, C14:2, C16:1, C4/C3 and C8/C3, accompanied with decreased C0, C0/C16 and C8/C10. VLCADD and secondary carnitine deficiency could not be excluded, which was in keeping with the result of genetic testing.@*CONCLUSION@#The child was diagnosed with VLCADD, which may be attributed to the compound heterozygous c.664G>A and c.1056_1057del variants of the ACADVL gene.

Analysis of DPYS gene variants in a child with dihydropyrimidase deficiency / 中华医学遗传学杂志

OBJECTIVE@#To explore the genetic basis for a child with dihydropyrimidase (DHP) deficiency.@*METHODS@#High-throughput sequencing was carried out for the child. Suspected variants were verified by using Sanger sequencing.@*RESULTS@#The proband was found to carry compound heterozygous variants of the DPYS gene, namely c.1468C>T (a missense variant) and c.1339-1363del (a frameshifting variant).@*CONCLUSION@#The compound heterozygous variants of the DPYS gene probably underlie the DHP in this child. Above result has enabled genetic counseling and prenatal diagnosis for his parents.

Rapid screening of a hotspot variant c.609G>A in MMACHC gene by using PCR-high-resolution melting curve analysis / 中华医学遗传学杂志

OBJECTIVE@#To carry out genetic testing for two families affected with cobalamin C (cblC) and establish a rapid method for the detection of a hotspot pathogenic variant c.609G>A of the MMACHC gene by using a PCR-high-resolution melting curve (PCR-HRM) method.@*METHODS@#Genomic DNA was extracted from peripheral blood samples of the probands and their parents. Potential variants of the MMACHC gene was analyzed by Sanger sequencing. The c.609G>A variant of the MMACHC gene was screened among 100 healthy children with the PCR-HRM method.@*RESULTS@#Sanger sequencing revealed that proband 1 carried compound heterozygous variants c.394C>T and c.609G>A of the MMACHC gene, while proband 2 carried compound heterozygous variants c.482G>A and c.609G>A of the same gene. PCR-HRM analysis of the two probands and the 100 healthy children were consistent with the Sanger sequencing.@*CONCLUSION@#c.609G>A is a hotspot pathogenic variant of the MMACHC gene. The diagnosis of cblC may be rapidly attained through detection by PCR-HRM.

Analysis of CYP21A2 gene mutation and phenotype in patients with 21-hydroxylase deficiency / 中华内分泌代谢杂志

Objective To investigate the spectrum of CYP21A2 gene mutation and the correlation between genotype and phenotype in patients with 21-hydroxylase deficiency in Tianjin and surrounding areas.Methods Genomic DNA was extracted from the peripheral blood samples of the proband.Locus-specific PCR,direct sequencing of PCR amplification products,and multiplex ligation-dependent probe amplification were applied to detect pathogenic gene CYP21A2 and the relationship between genotypes and phenotypes was analyzed.Results (1) Of 35 patients with 21-hydroxylase deficiency,25 were classified as salt-wasting phenotype and 10 were simple virilizing phenotype.(2) 69 mutant alleles were detected in a total of 70 alleles in 35 patients.Only one mutant allele was detected in one patient.Two mutant alleles were detected in all other patients,with the mutation detection rate 98.6％.(3) A total of 6 types of mutations were detected,of which c.293-13C/A＞G (I2G) was the most common,accounting for 57.1％ (40/70),followed by 18.6％ (13/70) for large gene deletion or conversion,and 14.3％ (10/70) for p.I173N.In addition,a novel mutation,c.949C＞T (p.R317X),which has not been reported previously,was detected as a pathogenic mutation.(4) Correlation analysis of genotype and phenotype in 35 children showed that the phenotype predicted by genotype was consistent with the actual salt-wasting phenotype in 31 children,and those in three children were inconsistent with the actual clinical phenotype.Conclusion The mutation characteristics of CYP21A2 gene in patients with 21-hydroxylase deficiency in Tianjin and surrounding areas are slightly different from those reported in other regions in China.A mutation c.949C＞T has not been reported,which enriches the mutation spectrum of CYP21A2 gene and provide the foundation for genetic counseling and prenatal diagnosis.

Diagnosis and long-term follow-up of 4-hydroxy butyrate aciduria in 9 cases / 中华实用儿科临床杂志

Objective To study the clinical and laboratory diagnosis and follow-up of 4-hydroxy butyrate aciduria in children.Methods From June 2012 to July 2017,9 cases in Tianjin Children's Hospital were analyzed.According to their clinical features,multidimensional analysis was pedormed by using head magnetic resonance imaging (MRI),urine gas chromatography-mass spectrometry (GC/MS) semi-quantitative testing and gene mutation analysis of ALDH5A1.Results The onset age of the 9 cases was less than 1 year old,and all had psychomotor retardation,in which 4 cases with epileptic seizures,1 case with consciousness disturbance and 1 case with involuntary movement.All the cases underwent head MRI and 4 cases showed bilateral symmetry pallidal lesions,including 1 case with symmetry abnormality of the midbrain cerebral peduncle,1 case with encephalomalacia in left temporal cortex and 4 cases with widening of the ventricle and extracerebral space.By the urine GC/MS semi-quantitative testing,all 9 the cases showed increasing 4-hydroxy butyric acid and by the ALDH5A1 gene mutation analysis,all 9 the cases were detected with gene mutation (3 cases belonging to c.1568C ＞ T homozygous mutation,1 case belonging to c.839T ＞ G homozygous mutation and the other 5 cases belonging to compound heterozygous mutation,which included c.691G ＞ A,c.1568C ＞T;c.1383_2delA,c.1568C ＞ T;c.527G ＞ A,c.691G ＞ A;c.904G ＞ A,c.1022C ＞ A;c.398_399delA,c.638G ＞ T).Nine cases were given symptomatic treatment,and 4 cases with epileptic seizures were given antiepileptic drugs.During the follow-up of the above 9 cases,1 case died of status epilepticus,1 case had been under control for 5 years,and 2 cases were effectively treated.Psychomotor retardation was improved in varying degrees in 8 cases.Involuntarymovement disappeared in 1 case while 2 cases still showed increasing 4-hydroxy butyric acid by means of urine GC/MS semi-quantitative testing.Conclusions Most of 4-hydroxy butyrate aciduria occurs within 1 year old,with psychomotor development as the first manifestation,which can be associated with epilepsy.The head MRI is characterized by a symmetrical Globus pallid abnormal signal.Urine GC/MS shows an increase in 4-hydroxy butyrate,which is the basis for biochemical diagnosis of the disease.Its accumulation in the body mainly damages the central nervous system.ALDH5A1 is a disease-causing gene,in which c.1568C ＞ T site has a high mutation frequency,and it is speculated that this site may be a hot spot mutation in Chinese children.Patients with epilepsy may die from status epilepticus and may be used as a clinical indicator to judge the severity of the disease.There is no specific treatment,and the patients combined with epilepsy can be treated with anti-epileptic drugs.Valproic acid should be avoided as it can aggravate the condition.

Deletional variant of REEP1 gene in a pedigree affected with spastic paraplegia type 31 / 中华医学遗传学杂志

OBJECTIVE@#To detect pathogenic variation in a pedigree affected with hereditary spastic paraplegia type 31 and explore its molecular pathogenesis.@*METHODS@#Customized Roche NimbleGen capture probes were used to capture all exons of the target genes in relation with hereditary spastic paraplegia. The DNA samples were also assayed with fluorescent quantitative PCR as well as chromosomal microarray analysis using CytoScan HD chip.@*RESULTS@#The proband and her father and grandfather were found to carry a deletion for position 85 992 693-86 842 693 on chromosome 2, which spanned approximately 900 kb and encompassed the REEP1 gene. The latter has been specifically associated with hereditary spastic paraplegia type 31. The same deletion was not found in her mother who is phenotypically normal.@*CONCLUSION@#The deletional variation of the REEP1 gene probably underlies the disease in this pedigree.

Diagnosis and long-term follow-up of 4-hydroxy butyrate aciduria in 9 cases / 中华实用儿科临床杂志

Objective@#To study the clinical and laboratory diagnosis and follow-up of 4-hydroxy butyrate aciduria in children.@*Methods@#From June 2012 to July 2017, 9 cases in Tianjin Children′s Hospital were analyzed.According to their clinical features, multidimensional analysis was performed by using head magnetic resonance imaging (MRI), urine gas chromatography-mass spectrometry (GC/MS) semi-quantitative testing and gene mutation analysis of ALDH5A1.@*Results@#The onset age of the 9 cases was less than 1 year old, and all had psychomotor retardation, in which 4 cases with epileptic seizures, 1 case with consciousness disturbance and 1 case with involuntary movement.All the cases underwent head MRI and 4 cases showed bilateral symmetry pallidal lesions, including 1 case with symmetry abnormality of the midbrain cerebral peduncle, 1 case with encephalomalacia in left temporal cortex and 4 cases with widening of the ventricle and extracerebral space.By the urine GC/MS semi-quantitative testing, all 9 the cases showed increasing 4-hydroxy butyric acid and by the ALDH5A1 gene mutation analysis, all 9 the cases were detected with gene mutation (3 cases belonging to c. 1568C>T homozygous mutation, 1 case belonging to c. 839T>G homozygous mutation and the other 5 cases belonging to compound heterozygous mutation, which included c. 691G>A, c.1568C>T; c.1383_2delA, c.1568C>T; c.527G>A, c.691G>A; c.904G>A, c.1022C>A; c.398_399delA, c.638G>T). Nine cases were given symptomatic treatment, and 4 cases with epileptic seizures were given antiepileptic drugs.During the follow-up of the above 9 cases, 1 case died of status epilepticus, 1 case had been under control for 5 years, and 2 cases were effectively treated.Psychomotor retardation was improved in varying degrees in 8 cases.Involuntary movement disappeared in 1 case while 2 cases still showed increasing 4-hydroxy butyric acid by means of urine GC/MS semi-quantitative testing.@*Conclusions@#Most of 4-hydroxy butyrate aciduria occurs within 1 year old, with psychomotor development as the first manifestation, which can be associated with epilepsy.The head MRI is characte-rized by a symmetrical Globus pallid abnormal signal.Urine GC/MS shows an increase in 4-hydroxy butyrate, which is the basis for biochemical diagnosis of the disease.Its accumulation in the body mainly damages the central nervous system.ALDH5A1 is a disease-causing gene, in which c. 1568C>T site has a high mutation frequency, and it is speculated that this site may be a hot spot mutation in Chinese children.Patients with epilepsy may die from status epilepticus and may be used as a clinical indicator to judge the severity of the disease.There is no specific treatment, and the patients combined with epilepsy can be treated with anti-epileptic drugs.Valproic acid should be avoided as it can aggravate the condition.

Genetic analysis of one family with congenital limb malformations / 中华医学遗传学杂志

Objective@#To detect potential mutation in a Chinese pedigree affected with congenital limb malformations.@*Methods@#Clinical data was collected. Genomic DNA was extracted from peripheral blood samples of family members. The zone of polarizing activity regulatory sequence (ZRS) were amplified by PCR and subjected to direct sequencing.@*Results@#Among the 13 individuals in this pedigree, there were 4 PPD patients, who were characterized by varying degrees of deformity. The female patients suffered triphalangeal thumb and preaxial polydactyly, while the male patients only had preaxial polydactyly. Only one patient had foot involvement. TA heterogeneous mutations was discovered in the ZRS (105C>G) in all patients, the same mutation was not detected in 2 healthy family members.@*Conclusion@#The inheritance pattern of PPD was autosomal dominant inheritance. There was a significant variability of symptoms among family patients. The heterozygous mutation of the ZRS (105C>G) probably underlie the disease.

Analysis of co-segregation of methylation pattern and gene ontology among pedigrees affected with neural tube defects / 中华医学遗传学杂志

OBJECTIVE@#To explore the characteristics of differentially methylated genes and gene ontology associated with neural tube defects (NTDs).@*METHODS@#Twelve subjects from 3 NTDs pedigrees were enrolled. Patients with NTDs have served as the case group, while their family members with normal phenotypes have served as the control group. Genomic DNA was extracted from peripheral venous blood samples of the families and used for DNA methylation analysis. Pairwise comparison was carried out primarily for patient-offspring pairs, and co-segregation of methylation pattern with NTDs was analyzed. Pathway related to differentially methylated genes was predicted with DAVID software.@*RESULTS@#Pairwise comparison indicated that VTRNA2-1 was the only gene in which all CpG sites were methylated. Co-segregation of VTRNA2-1 gene methylation with NTDs was found in all pedigrees. Pathways of hypermethylated genes included plasma membrane component, regulation of cellular protein metabolic process, and regulation of actin cytoskeleton organization, while the pathways of hypomethylated genes have included transcription regulator activity, cell adhesion, and neuronal differentiation.@*CONCLUSION@#Methylation of the VTRNA2-1 gene has co-segregated with NTDs in the studied pedigrees. The pathways of differentially methylated genes has involved with mechanism of neural tube development.

Genetic analysis of one family with congenital limb malformations / 中华医学遗传学杂志

OBJECTIVE@#To detect potential mutation in a Chinese pedigree affected with congenital limb malformations.@*METHODS@#Clinical data was collected. Genomic DNA was extracted from peripheral blood samples of family members. The zone of polarizing activity regulatory sequence (ZRS) were amplified by PCR and subjected to direct sequencing.@*RESULTS@#Among the 13 individuals in this pedigree, there were 4 PPD patients, who were characterized by varying degrees of deformity. The female patients suffered triphalangeal thumb and preaxial polydactyly, while the male patients only had preaxial polydactyly. Only one patient had foot involvement. TA heterogeneous mutations was discovered in the ZRS (105C>G) in all patients, the same mutation was not detected in 2 healthy family members.@*CONCLUSION@#The inheritance pattern of PPD was autosomal dominant inheritance. There was a significant variability of symptoms among family patients. The heterozygous mutation of the ZRS (105C>G) probably underlie the disease.

Identification of a novel mutation of UPB1 gene in a Chinese family affected with beta-ureidopropinoase deficiency / 中华医学遗传学杂志

OBJECTIVE@#To explore the molecular etiology for a Chinese family affected with beta-ureidopropinoase deficiency.@*METHODS@#Genomic DNA was extracted from the peripheral blood samples of family members. All exons and flanking intron regions of the UPB1 gene were amplified by PCR and detected by direct sequencing. The pathogenicity of identified mutation was analyzed using Polyphen2 and SIFT software.@*RESULTS@#Compound heterozygous mutations of the UPB1 gene, including c.853G>A (p.A285T) and c.917-1G>A, were discovered in the proband, which were inherited respectively from his mother and father. Bioinformatics analysis suggested that this novel mutation was damaging.@*CONCLUSION@#The compound heterozygous mutations of the UPB1 gene probably underlie the beta-ureidopropinoase deficiency in the infant. Discovery of c.853G>A also enriched the mutation spectrum of the UPB1 gene.

A study on the IFIH1 gene polymorphism in children with type 1 diabetes in Tianjin area / 中华内分泌代谢杂志

The blood samples of 102 type 1 diabetic children aged under 15 years and 127 normal children were collected and their genomic DNAs were extracted. The single nucleotide polymorphisms rs1990760 and rs35744605 of interferon induced with helicase C domain 1(IFIH1)gene were detected. The results showed that the allele of IFIH1 rs35744605 in diabetes group and control group was the wild type G allele. The frequency of IFIH1 rs1990760 A allele in diabetes group was higher than that in control group(22. 1％ vs 13. 0％ ,P=0. 015), suggesting that IFIH1 rs1990760 A allele is associated with type 1 diabetes in Tianjin area.

Identification of ALDH5A1 gene mutations in a Chinese family affected with succinic semialdehyde dehydrogenase deficiency / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To detect potential mutation in a Chinese family affected with succinic semialdehyde dehydrogenase deficiency.</p><p><b>METHODS</b>Genomic DNA was extracted from the peripheral blood samples of the proband, her family members and 100 healthy controls. All exons and flanking intronic regions of the ALDH5A1 gene were amplified by PCR and subjected to direct sequencing.</p><p><b>RESULTS</b>The proband was found to have compound heterozygous mutations of the ALDH5A1 gene, namely c.398_399delAA (p.N134X) and c.638G>T (p.R213L), for which her parents were both heterozygous carriers. The same mutations were not found among the 100 healthy controls.</p><p><b>CONCLUSION</b>The novel mutations of the ALDH5A1 gene probably underlie the pathogenesis of the disease in the infant, which also enriched the mutation spectrum of the ALDH5A1 gene.</p>

The preparation and feasibility study of composite urethral stent-rabbit oral mucosal epithelial cells and PCL electrospun fiber / 天津医药

Objective To explore the feasibility of using composite scaffolds of rabbit oral epithelial cells and polycaprolactone (PCL) electrospun fibers for urethral repair. Methods The 25%PCL was prepared using a 5:1 by volume mixture of trichloromethane and anhydrous methanol, and PCL fiber tubular scaffolds were obtained by electrospinning. Rabbit oral mucosa epithelial cells (1.5 × 105) were implanted on the PCL scaffold. Subsequently, they were embedded in nude mice subcutaneous, explanted in 2 weeks. PCL fiber tubular scaffolds without rabbit oral mucosa epithelial cells were used as control. The complex urethral scaffolds were evaluated by immunofluorescence staining with cytokeratin antibody and HE staining. Results Compared with blank PCL group, the rabbit oral mucosa epithelial cell group showed a good cellularization. Rabbit oral mucosa epithelial cells formed a dense cell layer on the surface of PCL lumen, which suggested that rabbit oral mucosa epithelial cells can proliferate on the surface of PCL lumen. Conclusion Rabbit oral epithelial cells can be used as one of the seed cells for tissue engineered urethral scaffolds, and it is possible to construct tissue engineering substitute materials for urethral repair by rabbit oral epithelial cells combined with PCL.