QIL1 mutation causes MICOS disassembly and early onset fatal mitochondrial encephalopathy with liver diseaseReportar como inadecuado

QIL1 mutation causes MICOS disassembly and early onset fatal mitochondrial encephalopathy with liver disease - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 Department of Cell Biology Boston, MA, USA 2 Institut Cochin 3 PROTECT - Promoting Research Oriented Towards Early Cns Therapies 4 Institut de Myologie 5 Service de biochimie-hormonologie 6 Department of Pediatrics Pittsburgh, USA 7 Service de Biochimie Bicêtre 8 Service de Radiologie AP-HP Hôpital Robert Debré 9 Reference Center for Inborn Errors of Metabolism AP-HP Hôpital Robert Debré

Abstract : Previously, we identified QIL1 as a subunit of mitochondrial contact site MICOS complex and demonstrated a role for QIL1 in MICOS assembly, mitochondrial respiration, and cristae formation critical for mitochondrial architecture Guarani et al., 2015. Here, we identify QIL1 null alleles in two siblings displaying multiple clinical symptoms of early-onset fatal mitochondrial encephalopathy with liver disease, including defects in respiratory chain function in patient muscle. QIL1 absence in patients- fibroblasts was associated with MICOS disassembly, abnormal cristae, mild cytochrome c oxidase defect, and sensitivity to glucose withdrawal. QIL1 expression rescued cristae defects, and promoted re-accumulation of MICOS subunits to facilitate MICOS assembly. MICOS assembly and cristae morphology were not efficiently rescued by over-expression of other MICOS subunits in patient fibroblasts. Taken together, these data provide the first evidence of altered MICOS assembly linked with a human mitochondrial disease and confirm a central role for QIL1 in stable MICOS complex formation.

Autor: Virginia Guarani - Claude Jardel - Dominique Chrétien - Anne Lombès - Paule Bénit - Clémence Labasse - Emmanuelle Lacène - A

Fuente: https://hal.archives-ouvertes.fr/


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