Background The mutation of the tyrosinase (TYR) gene results in oculocutaneous albinism type 1 (OCA1), an autosomal recessive genetic disorder. OCA1 is the most common type of OCA in the Chinese population. Hence,...Background The mutation of the tyrosinase (TYR) gene results in oculocutaneous albinism type 1 (OCA1), an autosomal recessive genetic disorder. OCA1 is the most common type of OCA in the Chinese population. Hence, the TYR gene was tested in this study. We also delineated the genetic analysis of OCA1 in a Chinese family. Methods Genomic DNA was isolated from the blood leukocytes of a proband and his family. Mutational analysis at the TYR locus by DNA sequencing was used to screen five exons, including the intron/exon junctions. A pedigree chart was drawn and the fundus of the eyes of the proband was also examined. Results A novel missense mutation p.1151S on exon 1, and homozygous TYR mutant alleles were identified in the proband. None of the mutants was identified among the 100 normal control subjects. Genetic analysis of the proband's wife showed normal alleles in the TYR gene. Thus, the fetus was predicated a carrier of OCA1 with a normal appearance. Conclusion This study provided new information about a novel mutation, p.1151S, in the TYR gene in a Chinese family with OCAI. Further investigation of the proband would be helpful to determine the effects of this mutation on TYR activity.展开更多
目的总结报道1例智力障碍伴或不伴周围神经病(intellectual developmental disorder with or without peripheral neuropathy,IDDPN)患儿的临床特点和基因核苷二磷酸连接片段X型基序2(nucleoside diphosphate linked moiety X-type moti...目的总结报道1例智力障碍伴或不伴周围神经病(intellectual developmental disorder with or without peripheral neuropathy,IDDPN)患儿的临床特点和基因核苷二磷酸连接片段X型基序2(nucleoside diphosphate linked moiety X-type motif 2,NUDT2)的致病变异。方法采用回顾性分析,对2023年4月就诊于天津市儿童医院康复医学科的1例IDDPN患儿临床资料进行总结,并对现有报道NUDT2变异所致IDDPN患儿的临床表型与其基因突变谱的关系进行分析。结果本例患儿全面发育迟缓,面容特殊,四肢肌张力减退,伴有周围神经损害,全外显子测序发现患儿携带NUDT2基因的一个纯合突变c.34C>T(p.R12X)为无义突变。Sanger法验证,父母双方均为c.34C>T杂合子突变携带者。纳入国外已报道的10例IDDPN患者,发现导致发病的均为纯合突变,临床表型均有不同程度的认知障碍、运动障碍,其中3例合并周围神经损害。结论本例患儿低出生体质量/身长,婴儿期吸吮无力,肌张力减退,全面发育迟缓伴周围神经损害,基因检测提示NUDT2基因的纯合无义突变,诊断为IDDPN,为临床对该病的认识提供证据支持。展开更多
Kartagener综合征是原发性纤毛运动障碍(primary ciliary dyskinesia, PCD)的一种亚型,是一种罕见先天性的以常染色体隐性遗传为主的疾病,以纤毛运动障碍为特征。为探索1例PCD伴无精子症患者不孕的遗传学病因,同时也为其生殖遗传咨询包...Kartagener综合征是原发性纤毛运动障碍(primary ciliary dyskinesia, PCD)的一种亚型,是一种罕见先天性的以常染色体隐性遗传为主的疾病,以纤毛运动障碍为特征。为探索1例PCD伴无精子症患者不孕的遗传学病因,同时也为其生殖遗传咨询包括后代发生遗传病的风险提供指导,应用全外显子组测序技术对PCD以及不孕不育相关基因进行生物信息学分析及诊断,发现患者CCDC151基因第8外显子c. 1059C>A (p.Tyr353*)纯合突变可导致PCD 30型。依据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics, ACMG)指南分类,该无义突变为致病性变异。该病患者的相关临床表征有反复发作型中耳炎、慢性支气管炎、鼻塞、纤毛清除缺陷所致呼吸功能不全、哮喘、咳嗽、反复呼吸道感染、鼻息肉、纤毛运动异常、支气管扩张,约50%的患者有完全性内脏反位。目前未见CCDC151基因变异导致男性不育及无精子症表型的报道。本研究发现一个导致PCD的CCDC151基因新突变,丰富了PCD罕见病以及CCDC151基因突变谱,同时首次报道了CCDC151基因突变可导致男性无精子症的不育表型。展开更多
BACKGROUND Dubin-Johnson syndrome(DJS)is a benign autosomal recessive liver disease involving mutations of the ABCC2 gene.It is characterized by chronic or intermittent conjugated hyperbilirubinemia,with chronic idiop...BACKGROUND Dubin-Johnson syndrome(DJS)is a benign autosomal recessive liver disease involving mutations of the ABCC2 gene.It is characterized by chronic or intermittent conjugated hyperbilirubinemia,with chronic idiopathic jaundice as the main clinical manifestation.Genetic alterations of the ABCC2 gene are commonly used for diagnosing DJS;however,the causative ABCC2 point mutation in Chinese patients remains unknown.Research on ABCC2 mutations in Chinese DJS patients is extremely rare,and the diagnosis of DJS remains limited.The routine analysis of ABCC2 mutations is helpful for the diagnosis of DJS.Here,we report the clinical characteristics and ABCC2 genotype of an adult female DJS patient.This article is to expound the discovery of more potentially pathogenic ABCC2 variants will that contribute to DJS identification.CASE SUMMARY This study investigated a woman referred for DJS and involved clinical and genetic analyses.ABCC2 mutations were identified by next-generation sequencing(NGS).The patient showed intermittent jaundice and conjugated hyperbilirubinemia.Histopathological examinations were consistent with the typical phenotype of DJS.Genetic diagnostic analysis revealed an ABCC2 genotype exhibiting a pathogenic variant,namely c.2443C>T(p.Arg815*),which has not been reported previously in the domestic or foreign literature.CONCLUSION Pathogenic ABCC2 mutations play an important role in the diagnosis of DJS,especially in patients with atypical presentations.Currently,NGS is used in the routine analysis of DJS cases and such tests of further cases will better illuminate the relationship between various genotypes and phenotypes of DJS.展开更多
BACKGROUND Gitelman syndrome(GS)is an unusual,autosomal recessive salt-losing tubulopathy characterized by hypokalemic metabolic alkalosis,hypomagnesemia and hypocalciuria.It is caused by mutations in the solute carri...BACKGROUND Gitelman syndrome(GS)is an unusual,autosomal recessive salt-losing tubulopathy characterized by hypokalemic metabolic alkalosis,hypomagnesemia and hypocalciuria.It is caused by mutations in the solute carrier family 12 member 3(SLC12A3)gene resulting in disordered function of the thiazidesensitive NaCl co-transporter.To date,many types of mutations in the SLC12A3 gene have been discovered that trigger different clinical manifestations.Therefore,gene sequencing should be considered before determining the course of treatment for GS patients.CASE SUMMARY A 55-year-old man was admitted to our department due to hand numbness and fatigue.Laboratory tests after admission showed hypokalemia,metabolic alkalosis and renal failure,all of which suggested a diagnosis of GS.Genome sequencing of DNA extracted from the patient’s peripheral blood showed a rare homozygous mutation in the SLC12A3 gene(NM_000339.2:chr16:56903671,Exon4,c.536T>A,p.Val179Asp).This study reports a rare homozygous mutation in SLC12A3 gene of a Chinese patient with GS.CONCLUSION Genetic studies may improve the diagnostic accuracy of Gitelman syndrome and improve genetic counseling for individuals and their families with these types of genetic disorders.展开更多
基金This study was supported in part by grants from the Natural Science Foundation of Beijing (No. 7092040), the Capital Medical Development Foundation (No. 2007-3111), and the National Natural Science Foundation of China (No. 31071252).
文摘Background The mutation of the tyrosinase (TYR) gene results in oculocutaneous albinism type 1 (OCA1), an autosomal recessive genetic disorder. OCA1 is the most common type of OCA in the Chinese population. Hence, the TYR gene was tested in this study. We also delineated the genetic analysis of OCA1 in a Chinese family. Methods Genomic DNA was isolated from the blood leukocytes of a proband and his family. Mutational analysis at the TYR locus by DNA sequencing was used to screen five exons, including the intron/exon junctions. A pedigree chart was drawn and the fundus of the eyes of the proband was also examined. Results A novel missense mutation p.1151S on exon 1, and homozygous TYR mutant alleles were identified in the proband. None of the mutants was identified among the 100 normal control subjects. Genetic analysis of the proband's wife showed normal alleles in the TYR gene. Thus, the fetus was predicated a carrier of OCA1 with a normal appearance. Conclusion This study provided new information about a novel mutation, p.1151S, in the TYR gene in a Chinese family with OCAI. Further investigation of the proband would be helpful to determine the effects of this mutation on TYR activity.
文摘目的总结报道1例智力障碍伴或不伴周围神经病(intellectual developmental disorder with or without peripheral neuropathy,IDDPN)患儿的临床特点和基因核苷二磷酸连接片段X型基序2(nucleoside diphosphate linked moiety X-type motif 2,NUDT2)的致病变异。方法采用回顾性分析,对2023年4月就诊于天津市儿童医院康复医学科的1例IDDPN患儿临床资料进行总结,并对现有报道NUDT2变异所致IDDPN患儿的临床表型与其基因突变谱的关系进行分析。结果本例患儿全面发育迟缓,面容特殊,四肢肌张力减退,伴有周围神经损害,全外显子测序发现患儿携带NUDT2基因的一个纯合突变c.34C>T(p.R12X)为无义突变。Sanger法验证,父母双方均为c.34C>T杂合子突变携带者。纳入国外已报道的10例IDDPN患者,发现导致发病的均为纯合突变,临床表型均有不同程度的认知障碍、运动障碍,其中3例合并周围神经损害。结论本例患儿低出生体质量/身长,婴儿期吸吮无力,肌张力减退,全面发育迟缓伴周围神经损害,基因检测提示NUDT2基因的纯合无义突变,诊断为IDDPN,为临床对该病的认识提供证据支持。
文摘Kartagener综合征是原发性纤毛运动障碍(primary ciliary dyskinesia, PCD)的一种亚型,是一种罕见先天性的以常染色体隐性遗传为主的疾病,以纤毛运动障碍为特征。为探索1例PCD伴无精子症患者不孕的遗传学病因,同时也为其生殖遗传咨询包括后代发生遗传病的风险提供指导,应用全外显子组测序技术对PCD以及不孕不育相关基因进行生物信息学分析及诊断,发现患者CCDC151基因第8外显子c. 1059C>A (p.Tyr353*)纯合突变可导致PCD 30型。依据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics, ACMG)指南分类,该无义突变为致病性变异。该病患者的相关临床表征有反复发作型中耳炎、慢性支气管炎、鼻塞、纤毛清除缺陷所致呼吸功能不全、哮喘、咳嗽、反复呼吸道感染、鼻息肉、纤毛运动异常、支气管扩张,约50%的患者有完全性内脏反位。目前未见CCDC151基因变异导致男性不育及无精子症表型的报道。本研究发现一个导致PCD的CCDC151基因新突变,丰富了PCD罕见病以及CCDC151基因突变谱,同时首次报道了CCDC151基因突变可导致男性无精子症的不育表型。
基金Supported by The Talents of Qiankehe platform of China,No.[2018]5779-40the Zhuke Contract,No.[2018]1-92and the Qiankehe Support,No.[2017]2874.
文摘BACKGROUND Dubin-Johnson syndrome(DJS)is a benign autosomal recessive liver disease involving mutations of the ABCC2 gene.It is characterized by chronic or intermittent conjugated hyperbilirubinemia,with chronic idiopathic jaundice as the main clinical manifestation.Genetic alterations of the ABCC2 gene are commonly used for diagnosing DJS;however,the causative ABCC2 point mutation in Chinese patients remains unknown.Research on ABCC2 mutations in Chinese DJS patients is extremely rare,and the diagnosis of DJS remains limited.The routine analysis of ABCC2 mutations is helpful for the diagnosis of DJS.Here,we report the clinical characteristics and ABCC2 genotype of an adult female DJS patient.This article is to expound the discovery of more potentially pathogenic ABCC2 variants will that contribute to DJS identification.CASE SUMMARY This study investigated a woman referred for DJS and involved clinical and genetic analyses.ABCC2 mutations were identified by next-generation sequencing(NGS).The patient showed intermittent jaundice and conjugated hyperbilirubinemia.Histopathological examinations were consistent with the typical phenotype of DJS.Genetic diagnostic analysis revealed an ABCC2 genotype exhibiting a pathogenic variant,namely c.2443C>T(p.Arg815*),which has not been reported previously in the domestic or foreign literature.CONCLUSION Pathogenic ABCC2 mutations play an important role in the diagnosis of DJS,especially in patients with atypical presentations.Currently,NGS is used in the routine analysis of DJS cases and such tests of further cases will better illuminate the relationship between various genotypes and phenotypes of DJS.
基金Supported by the National Natural Science Foundation of China,No.81700649.
文摘BACKGROUND Gitelman syndrome(GS)is an unusual,autosomal recessive salt-losing tubulopathy characterized by hypokalemic metabolic alkalosis,hypomagnesemia and hypocalciuria.It is caused by mutations in the solute carrier family 12 member 3(SLC12A3)gene resulting in disordered function of the thiazidesensitive NaCl co-transporter.To date,many types of mutations in the SLC12A3 gene have been discovered that trigger different clinical manifestations.Therefore,gene sequencing should be considered before determining the course of treatment for GS patients.CASE SUMMARY A 55-year-old man was admitted to our department due to hand numbness and fatigue.Laboratory tests after admission showed hypokalemia,metabolic alkalosis and renal failure,all of which suggested a diagnosis of GS.Genome sequencing of DNA extracted from the patient’s peripheral blood showed a rare homozygous mutation in the SLC12A3 gene(NM_000339.2:chr16:56903671,Exon4,c.536T>A,p.Val179Asp).This study reports a rare homozygous mutation in SLC12A3 gene of a Chinese patient with GS.CONCLUSION Genetic studies may improve the diagnostic accuracy of Gitelman syndrome and improve genetic counseling for individuals and their families with these types of genetic disorders.