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MINPP1 prevents intracellular accumulation of the chelator inositol hexakisphosphate and is mutated in Pontocerebellar Hypoplasia

2020; Nature Portfolio; Volume: 11; Issue: 1 Linguagem: Inglês

10.1038/s41467-020-19919-y

2041-1723

Ekin Ucuncu, Karthyayani Rajamani, Miranda Wilson, Daniel Medina-Cano, Nami Altin, Pierre David, Giulia Barcia, Nathalie Lefort, Céline Banal, Marie-Thérèse Vasilache-Dangles, Gaële Pitelet, Elsa Lorino, Nathalie Rabasse, Éric Bieth, Maha S. Zaki, Meral Topçu, Fatma Müjgan Sönmez, Damir Musaev, Valentina Stanley, Christine Bôle‐Feysot, Patrick Nitschké, Arnold Münnich, Nadia Bahi‐Buisson, Catherine Fossoud, Fabienne Giuliano, Laurence Colleaux, Lydie Bürglen, Joseph G. Gleeson, Nathalie Boddaert, Adolfo Saiardi, Vincent Cantagrel,

Iron Metabolism and Disorders

Abstract Inositol polyphosphates are vital metabolic and secondary messengers, involved in diverse cellular functions. Therefore, tight regulation of inositol polyphosphate metabolism is essential for proper cell physiology. Here, we describe an early-onset neurodegenerative syndrome caused by loss-of-function mutations in the multiple inositol-polyphosphate phosphatase 1 gene ( MINPP1 ). Patients are found to have a distinct type of Pontocerebellar Hypoplasia with typical basal ganglia involvement on neuroimaging. We find that patient-derived and genome edited MINPP1 −/− induced stem cells exhibit an inefficient neuronal differentiation combined with an increased cell death. MINPP1 deficiency results in an intracellular imbalance of the inositol polyphosphate metabolism. This metabolic defect is characterized by an accumulation of highly phosphorylated inositols, mostly inositol hexakisphosphate (IP 6 ), detected in HEK293 cells, fibroblasts, iPSCs and differentiating neurons lacking MINPP1. In mutant cells, higher IP 6 level is expected to be associated with an increased chelation of intracellular cations, such as iron or calcium, resulting in decreased levels of available ions. These data suggest the involvement of IP 6 -mediated chelation on Pontocerebellar Hypoplasia disease pathology and thereby highlight the critical role of MINPP1 in the regulation of human brain development and homeostasis.