| Literature DB >> 32375063 |
Zachary T McEachin1, Tania F Gendron2, Nisha Raj3, María García-Murias4, Anwesha Banerjee5, Ryan H Purcell3, Patricia J Ward5, Tiffany W Todd6, Megan E Merritt-Garza7, Karen Jansen-West6, Chadwick M Hales8, Tania García-Sobrino9, Beatriz Quintáns4, Christopher J Holler10, Georgia Taylor10, Beatriz San Millán11, Susana Teijeira11, Toru Yamashita12, Ryuichi Ohkubo13, Nicholas M Boulis14, Chongchong Xu15, Zhexing Wen16, Nathalie Streichenberger17, Brent L Fogel18, Thomas Kukar19, Koji Abe12, Dennis W Dickson6, Manuel Arias20, Jonathan D Glass8, Jie Jiang5, Malú G Tansey21, María-Jesús Sobrido4, Leonard Petrucelli2, Wilfried Rossoll2, Gary J Bassell22.
Abstract
GGGGCC hexanucleotide repeat expansions (HREs) in C9orf72 cause amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) and lead to the production of aggregating dipeptide repeat proteins (DPRs) via repeat associated non-AUG (RAN) translation. Here, we show the similar intronic GGCCTG HREs that causes spinocerebellar ataxia type 36 (SCA36) is also translated into DPRs, including poly(GP) and poly(PR). We demonstrate that poly(GP) is more abundant in SCA36 compared to c9ALS/FTD patient tissue due to canonical AUG-mediated translation from intron-retained GGCCTG repeat RNAs. However, the frequency of the antisense RAN translation product poly(PR) is comparable between c9ALS/FTD and SCA36 patient samples. Interestingly, in SCA36 patient tissue, poly(GP) exists as a soluble species, and no TDP-43 pathology is present. We show that aggregate-prone chimeric DPR (cDPR) species underlie the divergent DPR pathology between c9ALS/FTD and SCA36. These findings reveal key differences in translation, solubility, and protein aggregation of DPRs between c9ALS/FTD and SCA36.Entities:
Keywords: ALS; C9orf72 expansion; FTD; RAN translation; SCA36; antisense oligonucleotide therapy; chimeric DPRs; dipeptide repeats; neurodegeneration
Mesh:
Substances:
Year: 2020 PMID: 32375063 PMCID: PMC8138626 DOI: 10.1016/j.neuron.2020.04.011
Source DB: PubMed Journal: Neuron ISSN: 0896-6273 Impact factor: 17.173