首页> 美国卫生研究院文献>American Journal of Human Genetics >Combination of Linkage Mapping and Microarray-Expression Analysis Identifies NF-κB Signaling Defect as a Cause of Autosomal-Recessive Mental Retardation
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Combination of Linkage Mapping and Microarray-Expression Analysis Identifies NF-κB Signaling Defect as a Cause of Autosomal-Recessive Mental Retardation

机译:链接映射和微阵列表达分析的组合确定了NF-κB信号缺陷是常染色体隐性智力低下的原因

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摘要

Autosomal-recessive inheritance accounts for nearly 25% of nonsyndromic mental retardation (MR), but the extreme heterogeneity of such conditions markedly hampers gene identification. Combining autozygosity mapping and RNA expression profiling in a consanguineous Tunisian family of three MR children with mild microcephaly and white-matter abnormalities identified the TRAPPC9 gene, which encodes a NF-κB-inducing kinase (NIK) and IκB kinase complex β (IKK-β) binding protein, as a likely candidate. Sequencing analysis revealed a nonsense variant (c.1708C>T [p.R570X]) within exon 9 of this gene that is responsible for an undetectable level of TRAPPC9 protein in patient skin fibroblasts. Moreover, TNF-α stimulation assays showed a defect in IkBα degradation, suggesting impaired NF-κB signaling in patient cells. This study provides evidence of an NF-κB signaling defect in isolated MR.
机译:常染色体隐性遗传占非综合征性智力低下(MR)的近25%,但是这种情况的极端异质性显着阻碍了基因鉴定。结合突尼斯家庭的三个近亲,轻度小头畸形和白色物质异常的突尼斯家庭的近亲结合和RNA表达谱分析,确定了TRAPPC9基因,该基因编码NF-κB诱导激酶(NIK)和IκB激酶复合物β(IKK-β )结合蛋白(可能的候选者)。测序分析显示,该基因第9外显子中有一个无意义的变异(c.1708C> T [p.R570X]),该变异导致患者皮肤成纤维细胞中TRAPPC9蛋白的水平无法检测。此外,TNF-α刺激试验显示IkBα降解缺陷,提示患者细胞中NF-κB信号传导受损。该研究提供了分离的MR中NF-κB信号传导缺陷的证据。

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