학술논문
Biallelic Mutations in ADPRHL2, Encoding ADP-Ribosylhydrolase 3, Lead to a Degenerative Pediatric Stress-Induced Epileptic Ataxia Syndrome
Document Type
article
Author
Ghosh, Shereen G; Becker, Kerstin; Huang, He; Dixon-Salazar, Tracy; Chai, Guoliang; Salpietro, Vincenzo; Al-Gazali, Lihadh; Waisfisz, Quinten; Wang, Haicui; Vaux, Keith K; Stanley, Valentina; Manole, Andreea; Akpulat, Ugur; Weiss, Marjan M; Efthymiou, Stephanie; Hanna, Michael G; Minetti, Carlo; Striano, Pasquale; Pisciotta, Livia; De Grandis, Elisa; Altmüller, Janine; Weixler, Lisa; Nürnberg, Peter; Thiele, Holger; Yis, Uluc; Okur, Tuncay Derya; Polat, Ayse Ipek; Amiri, Nafise; Doosti, Mohammad; Karimani, Ehsan Ghayoor; Toosi, Mehran B; Haddad, Gabriel; Karakaya, Mert; Wirth, Brunhilde; van Hagen, Johanna M; Wolf, Nicole I; Maroofian, Reza; Houlden, Henry; Cirak, Sebahattin; Gleeson, Joseph G
Source
American Journal of Human Genetics. 103(3)
Subject
Language
Abstract
ADP-ribosylation, the addition of poly-ADP ribose (PAR) onto proteins, is a response signal to cellular challenges, such as excitotoxicity or oxidative stress. This process is catalyzed by a group of enzymes referred to as poly(ADP-ribose) polymerases (PARPs). Because the accumulation of proteins with this modification results in cell death, its negative regulation restores cellular homeostasis: a process mediated by poly-ADP ribose glycohydrolases (PARGs) and ADP-ribosylhydrolase proteins (ARHs). Using linkage analysis and exome or genome sequencing, we identified recessive inactivating mutations in ADPRHL2 in six families. Affected individuals exhibited a pediatric-onset neurodegenerative disorder with progressive brain atrophy, developmental regression, and seizures in association with periods of stress, such as infections. Loss of the Drosophila paralog Parg showed lethality in response to oxidative challenge that was rescued by human ADPRHL2, suggesting functional conservation. Pharmacological inhibition of PARP also rescued the phenotype, suggesting the possibility of postnatal treatment for this genetic condition.