Bi-allelic ADPRHL2 Mutations Cause Neurodegeneration with Developmental Delay, Ataxia, and Axonal Neuropathy.
Am J Hum Genet. 2018 Nov 1;103(5):817-825. doi: 10.1016/j.ajhg.2018.10.005. Epub 2018 Oct 25.
|Authors/Editors:||Danhauser K, Alhaddad B, Makowski C, Piekutowska-Abramczuk D, Syrbe S, Gomez-Ospina N, Manning MA, Kostera-Pruszczyk A, Krahn-Peper C, Berutti R, Kovács-Nagy R, Gusic M, Graf E, Laugwitz L, Röblitz M, Wroblewski A, Hartmann H, Das AM, Bültmann E, Fang F, Xu M, Schatz UA, Karall D, Zellner H, Haberlandt E, Feichtinger RG, Mayr JA, Meitinger T, Prokisch H, Strom TM, Płoski R, Hoffmann GF, Pronicki M, Bonnen PE, Morlot S, Haack TB.|
ADP-ribosylation is a reversible posttranslational modification used to regulate protein function. ADP-ribosyltransferases transfer ADP-ribose from NAD+ to the target protein, and ADP-ribosylhydrolases, such as ADPRHL2, reverse the reaction. We used exome sequencing to identify five different bi-allelic pathogenic ADPRHL2 variants in 12 individuals from 8 families affected by a neurodegenerative disorder manifesting in childhood or adolescence with key clinical features including developmental delay or regression, seizures, ataxia, and axonal (sensori-)motor neuropathy. ADPRHL2 was virtually absent in available affected individuals' fibroblasts, and cell viability was reduced upon hydrogen peroxide exposure, although it was rescued by expression of wild-type ADPRHL2 mRNA as well as treatment with a PARP1 inhibitor. Our findings suggest impaired protein ribosylation as another pathway that, if disturbed, causes neurodegenerative diseases.