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- Angebault 2018 Sci Signal + (Communication between the endoplasmic reti … Communication between the endoplasmic reticulum (ER) and mitochondria plays a pivotal role in Ca<sup>2+</sup> signaling, energy metabolism, and cell survival. Dysfunction in this cross-talk leads to metabolic and neurodegenerative diseases. Wolfram syndrome is a fatal neurodegenerative disease caused by mutations in the ER-resident protein WFS1. Here, we showed that WFS1 formed a complex with neuronal calcium sensor 1 (NCS1) and inositol 1,4,5-trisphosphate receptor (IP<sub>3</sub>R) to promote Ca<sup>2+</sup> transfer between the ER and mitochondria. In addition, we found that NCS1 abundance was reduced in WFS1-null patient fibroblasts, which showed reduced ER-mitochondria interactions and Ca<sup>2+</sup> exchange. Moreover, in WFS1-deficient cells, NCS1 overexpression not only restored ER-mitochondria interactions and Ca<sup>2+</sup> transfer but also rescued mitochondrial dysfunction. Our results describe a key role of NCS1 in ER-mitochondria cross-talk, uncover a pathogenic mechanism for Wolfram syndrome, and potentially reveal insights into the pathogenesis of other neurodegenerative diseases.m syndrome, and potentially reveal insights into the pathogenesis of other neurodegenerative diseases.)