Deregulation of ER-mitochondria contact formation and mitochondrial calcium homeostasis mediated by VDAC in fragile X syndrome.
Deregulation of ER-mitochondria contact formation and mitochondrial calcium homeostasis mediated by VDAC in fragile X syndrome.
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DOI:
10.1016/j.devcel.2023.03.002
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发表时间:
2023-04
影响因子:
11.8
通讯作者:
Ji Geng;T. P. Khaket;Jie Pan;Wen Li;Yan Zhang;Y. Ping;Maria Inmaculada Cobos Sillero;B. Lu
中科院分区:
文献类型:
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作者:
Ji Geng;T. P. Khaket;Jie Pan;Wen Li;Yan Zhang;Y. Ping;Maria Inmaculada Cobos Sillero;B. Lu
Loss of fragile X messenger ribonucleoprotein (FMRP) causes fragile X syndrome (FXS), the most prevalent form of inherited intellectual disability. Here, we show that FMRP interacts with the voltage-dependent anion channel (VDAC) to regulate the formation and function of endoplasmic reticulum (ER)-mitochondria contact sites (ERMCSs), structures that are critical for mitochondrial calcium (mito-Ca2+) homeostasis. FMRP-deficient cells feature excessive ERMCS formation and ER-to-mitochondria Ca2+transfer. Genetic and pharmacological inhibition of VDAC or other ERMCS components restored synaptic structure, function, and plasticity and rescued locomotion and cognitive deficits of theDrosophila dFmr1mutant. Expressing FMRP C-terminal domain (FMRP-C), which confers FMRP-VDAC interaction, rescued the ERMCS formation and mito-Ca2+homeostasis defects inFXSpatient iPSC-derived neurons and locomotion and cognitive deficits inFmr1knockout mice. These results identify altered ERMCS formation and mito-Ca2+homeostasis as contributors to FXS and offer potential therapeutic targets.