Fragile X tremor/ataxia syndrome (FXTAS) is a recently described condition co nsisting of tremor, ataxia, parkinsonism, and executive dysfunction, presenting predominantly in male carriers of a fragile X mental retard...Fragile X tremor/ataxia syndrome (FXTAS) is a recently described condition co nsisting of tremor, ataxia, parkinsonism, and executive dysfunction, presenting predominantly in male carriers of a fragile X mental retardation 1 premutation. In this report, we present premutation carrier sisters in whom severity of clini cal signs correlated with a molecular pattern of X-inactivation favoring highe r expression of the premutation allele. In these women with a common genetic bac kground, we suggest that symptom severity may be dictated by X-inactivation, a nd thus a higher percentage of cells producing the premutation-containing mRNA result in increased toxicity and disease.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
文摘Fragile X tremor/ataxia syndrome (FXTAS) is a recently described condition co nsisting of tremor, ataxia, parkinsonism, and executive dysfunction, presenting predominantly in male carriers of a fragile X mental retardation 1 premutation. In this report, we present premutation carrier sisters in whom severity of clini cal signs correlated with a molecular pattern of X-inactivation favoring highe r expression of the premutation allele. In these women with a common genetic bac kground, we suggest that symptom severity may be dictated by X-inactivation, a nd thus a higher percentage of cells producing the premutation-containing mRNA result in increased toxicity and disease.
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。
