Quantitative profiling of brain lipid raft proteome in a mouse model of fragile X syndrome.

Quantitative profiling of brain lipid raft proteome in a mouse model of fragile X syndrome.
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DOI:
10.1371/journal.pone.0121464
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Francesconi A
Francesconi A
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kalinowska M;Castillo C;Francesconi A

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脆性 X 综合征是遗传性智力障碍和自闭症的主要原因,其起因是编码 RNA 结合蛋白脆性 X 智力迟钝蛋白 (FMRP) 的 FMR1 基因的转录沉默。 FMRP 通过其在 mRNA 运输、稳定性和翻译调节中的作用,可以调节大约 4% 的大脑转录本的表达,从而为其对神经元和大脑回路功能的潜在多效性影响提供分子原理。在没有 FMRP 的情况下,一些细胞内信号通路失调,表明细胞缺陷可能很广泛,并可能导致体内平衡的变化。脂筏是质膜的特殊区域,富含胆固醇和鞘糖脂,参与细胞内信号传导的调节。在 FMRP 靶向的转录本中,有一个子集编码参与脂质生物合成和稳态的蛋白质,其失调可能会影响脂筏的完整性和功能。使用基于定量质谱的方法,我们分析了 Fmr1 敲除小鼠(一种脆性 X 综合征动物模型)的脂筏蛋白质组,并鉴定了在 Fmr1 敲除小鼠脂筏中差异表达的候选蛋白质。此外,对这些候选蛋白的网络分析揭示了它们之间的连接性,并预测了与编码髓鞘、轴突和生长锥成分的基因的功能连接性。我们的研究结果有助于识别 Fmr1 沉默引起的分子和细胞功能障碍,并揭示脆性 X 综合征和其他自闭症谱系障碍之间的共同病理。
Fragile X Syndrome, a leading cause of inherited intellectual disability and autism, arises from transcriptional silencing of the FMR1 gene encoding an RNA-binding protein, Fragile X Mental Retardation Protein (FMRP). FMRP can regulate the expression of approximately 4% of brain transcripts through its role in regulation of mRNA transport, stability and translation, thus providing a molecular rationale for its potential pleiotropic effects on neuronal and brain circuitry function. Several intracellular signaling pathways are dysregulated in the absence of FMRP suggesting that cellular deficits may be broad and could result in homeostatic changes. Lipid rafts are specialized regions of the plasma membrane, enriched in cholesterol and glycosphingolipids, involved in regulation of intracellular signaling. Among transcripts targeted by FMRP, a subset encodes proteins involved in lipid biosynthesis and homeostasis, dysregulation of which could affect the integrity and function of lipid rafts. Using a quantitative mass spectrometry-based approach we analyzed the lipid raft proteome of Fmr1 knockout mice, an animal model of Fragile X syndrome, and identified candidate proteins that are differentially represented in Fmr1 knockout mice lipid rafts. Furthermore, network analysis of these candidate proteins reveals connectivity between them and predicts functional connectivity with genes encoding components of myelin sheath, axonal processes and growth cones. Our findings provide insight to aid identification of molecular and cellular dysfunctions arising from Fmr1 silencing and for uncovering shared pathologies between Fragile X syndrome and other autism spectrum disorders.
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