脆性X染色体综合征(fragile X syndrome,FXS)是由于fmr1基因沉默导致脆性X精神迟滞蛋白(fragile X mental retardation protein,FMRP)表达不足而引起的一种常见的遗传性精神发育迟滞疾病。除了导致智力障碍外,FXS不同个体在临床还表现...脆性X染色体综合征(fragile X syndrome,FXS)是由于fmr1基因沉默导致脆性X精神迟滞蛋白(fragile X mental retardation protein,FMRP)表达不足而引起的一种常见的遗传性精神发育迟滞疾病。除了导致智力障碍外,FXS不同个体在临床还表现出神经发育障碍导致的其它缺陷,如注意力缺陷、多动症、自闭症、语言障碍和攻击性行为等。目前,其治疗手段主要集中在对FMRP调节的下游基因或蛋白信号的恢复和缓解上,但并不能够完全治愈。现有的针对FXS疾病的药物靶点除了I型代谢型谷氨酸受体(metabtropic glutamate receptors,mGluRs)外,近几年研究表明,γ-氨基丁酸(γ-aminobutyric acid,GABA)受体的激动剂也在动物模型和临床实验中表现出显著的效果。本文就GABA受体在FXS中的作用进展进行综述。展开更多
脆性X综合征(fragile X syndrome,FXS)是FMR1基因CGG异常重复扩增导致的疾病。本文报告1对经基因检测诊断为FXS的兄弟,2例患者分别为15岁和14岁,均存在语言障碍、智力障碍、注意力缺陷障碍、孤独症谱系障碍和FXS特征性面容等临床表现,...脆性X综合征(fragile X syndrome,FXS)是FMR1基因CGG异常重复扩增导致的疾病。本文报告1对经基因检测诊断为FXS的兄弟,2例患者分别为15岁和14岁,均存在语言障碍、智力障碍、注意力缺陷障碍、孤独症谱系障碍和FXS特征性面容等临床表现,其中先证者伴有罕见的晚发性癫痫发作,经左乙拉西坦治疗效果良好,而其弟弟经反复随访未见脑电图异常。该对病例提示FXS临床表型具有多样性和异质性。展开更多
脆性X相关性疾病(FragileXassociatedDisorders,FXD)是由脆性X智力低下蛋白(FragileXMental Retardation Protein,FMRP)部分或完全丧失引起的家族遗传性疾病。其中脆性X综合征(Fragile X syndrome,FXS)是遗传性智力残疾和自闭症的最常...脆性X相关性疾病(FragileXassociatedDisorders,FXD)是由脆性X智力低下蛋白(FragileXMental Retardation Protein,FMRP)部分或完全丧失引起的家族遗传性疾病。其中脆性X综合征(Fragile X syndrome,FXS)是遗传性智力残疾和自闭症的最常见原因之一,其发病率仅次于唐氏综合征,占非特发性智力低下患者的2%-6%,在X连锁智力低下患者中占40%。FXD临床表现不典型,遗传方式多样化。本文将从FXD的临床表现,FMR1基因及其致病机制,FMRP结构及其对转录翻译过程中的影响等方面进行综述。展开更多
目的至今已有多种筛查和诊断脆性X综合征(fragile X syndrome,FXS)的方法,以PCR法和Southern印迹方法应用最广,然而每种方法均存在各自的局限性。该研究探讨发根脆性X智力低下蛋白(fragile X mental retardation protein,FMRP)检测在诊...目的至今已有多种筛查和诊断脆性X综合征(fragile X syndrome,FXS)的方法,以PCR法和Southern印迹方法应用最广,然而每种方法均存在各自的局限性。该研究探讨发根脆性X智力低下蛋白(fragile X mental retardation protein,FMRP)检测在诊断或筛查FXS中的可靠性,以建立一种快速、简便、价廉且可靠的诊断FXS的方法。方法采用发根FMRP免疫组化的检测方法对80例健康儿童、40例不明原因智力低下儿童、已确诊FXS家系成员12例进行检查;用7-deza-dGTPPCR法进行对照,探讨其对诊断FXS的应用价值。结果在80例健康儿童中,发根FMRP的表达率均在80%以上。40例不明原因智力低下患儿中,2例确诊为FXS患儿的发根FMRP表达率分别为10%和0,另38例非FXS患者发根FMRP的表达率均在80%以上。在FXS家系调查中,确诊的2例FXS患者的发根FMRP表达率均为0。结论发根FMRP检测诊断FXS具有快速、简便、价廉、可靠等特点,值得进一步推广应用。展开更多
Fragiie X syndrome is the most common form of inherited mental retardation disease, resulting from absent of expression of its disease gene FMR1. To study the function of the fragiie X mental retardation protein (FMRP...Fragiie X syndrome is the most common form of inherited mental retardation disease, resulting from absent of expression of its disease gene FMR1. To study the function of the fragiie X mental retardation protein (FMRP) through protein/protein interaction, a mouse embryo cDNA library was screened by the yeast two-hybrid system. A clone was found to interact specifically with FMRP. The cDNA of this clone ( Genbank accession number af102875 ) encoded a protein highly homologous to human G/T mismatch-specific DNA thymine glycosylase ( hTDG ). Interactions between various alternatively spliced FMRP isoforms and a series of mTDG deletion proteins were further studied in the yeast two-hybrid system and their interaction amino acid regions were determined. interaction between FMRP and TDG existed inside exon 13 of FMRP ( amino acid residue 397-425 ) and around amino acid residue 122-346 of TDG. These results will be helpful to the study of the biological role of FMRP.展开更多
文摘脆性X染色体综合征(fragile X syndrome,FXS)是由于fmr1基因沉默导致脆性X精神迟滞蛋白(fragile X mental retardation protein,FMRP)表达不足而引起的一种常见的遗传性精神发育迟滞疾病。除了导致智力障碍外,FXS不同个体在临床还表现出神经发育障碍导致的其它缺陷,如注意力缺陷、多动症、自闭症、语言障碍和攻击性行为等。目前,其治疗手段主要集中在对FMRP调节的下游基因或蛋白信号的恢复和缓解上,但并不能够完全治愈。现有的针对FXS疾病的药物靶点除了I型代谢型谷氨酸受体(metabtropic glutamate receptors,mGluRs)外,近几年研究表明,γ-氨基丁酸(γ-aminobutyric acid,GABA)受体的激动剂也在动物模型和临床实验中表现出显著的效果。本文就GABA受体在FXS中的作用进展进行综述。
文摘脆性X综合征(fragile X syndrome,FXS)是FMR1基因CGG异常重复扩增导致的疾病。本文报告1对经基因检测诊断为FXS的兄弟,2例患者分别为15岁和14岁,均存在语言障碍、智力障碍、注意力缺陷障碍、孤独症谱系障碍和FXS特征性面容等临床表现,其中先证者伴有罕见的晚发性癫痫发作,经左乙拉西坦治疗效果良好,而其弟弟经反复随访未见脑电图异常。该对病例提示FXS临床表型具有多样性和异质性。
文摘脆性X相关性疾病(FragileXassociatedDisorders,FXD)是由脆性X智力低下蛋白(FragileXMental Retardation Protein,FMRP)部分或完全丧失引起的家族遗传性疾病。其中脆性X综合征(Fragile X syndrome,FXS)是遗传性智力残疾和自闭症的最常见原因之一,其发病率仅次于唐氏综合征,占非特发性智力低下患者的2%-6%,在X连锁智力低下患者中占40%。FXD临床表现不典型,遗传方式多样化。本文将从FXD的临床表现,FMR1基因及其致病机制,FMRP结构及其对转录翻译过程中的影响等方面进行综述。
文摘目的至今已有多种筛查和诊断脆性X综合征(fragile X syndrome,FXS)的方法,以PCR法和Southern印迹方法应用最广,然而每种方法均存在各自的局限性。该研究探讨发根脆性X智力低下蛋白(fragile X mental retardation protein,FMRP)检测在诊断或筛查FXS中的可靠性,以建立一种快速、简便、价廉且可靠的诊断FXS的方法。方法采用发根FMRP免疫组化的检测方法对80例健康儿童、40例不明原因智力低下儿童、已确诊FXS家系成员12例进行检查;用7-deza-dGTPPCR法进行对照,探讨其对诊断FXS的应用价值。结果在80例健康儿童中,发根FMRP的表达率均在80%以上。40例不明原因智力低下患儿中,2例确诊为FXS患儿的发根FMRP表达率分别为10%和0,另38例非FXS患者发根FMRP的表达率均在80%以上。在FXS家系调查中,确诊的2例FXS患者的发根FMRP表达率均为0。结论发根FMRP检测诊断FXS具有快速、简便、价廉、可靠等特点,值得进一步推广应用。
文摘Fragiie X syndrome is the most common form of inherited mental retardation disease, resulting from absent of expression of its disease gene FMR1. To study the function of the fragiie X mental retardation protein (FMRP) through protein/protein interaction, a mouse embryo cDNA library was screened by the yeast two-hybrid system. A clone was found to interact specifically with FMRP. The cDNA of this clone ( Genbank accession number af102875 ) encoded a protein highly homologous to human G/T mismatch-specific DNA thymine glycosylase ( hTDG ). Interactions between various alternatively spliced FMRP isoforms and a series of mTDG deletion proteins were further studied in the yeast two-hybrid system and their interaction amino acid regions were determined. interaction between FMRP and TDG existed inside exon 13 of FMRP ( amino acid residue 397-425 ) and around amino acid residue 122-346 of TDG. These results will be helpful to the study of the biological role of FMRP.
