Repeat-Associated Non-ATG Translation in Neurological Diseases
- 1Center for Neuro-Genetics, University of Florida, Gainesville, Florida 32610
- 2Departments of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida 32610
- 3Departments of Neurology, College of Medicine, University of Florida, Gainesville, Florida 32610
- 4Genetics Institute, University of Florida, Gainesville, Florida 32610
- Correspondence: ranum{at}ufl.edu
Abstract
More than 40 different neurological diseases are caused by microsatellite repeat expansions that locate within translated or untranslated gene regions, including 5′ and 3′ untranslated regions (UTRs), introns, and protein-coding regions. Expansion mutations are transcribed bidirectionally and have been shown to give rise to proteins, which are synthesized from three reading frames in the absence of an AUG initiation codon through a novel process called repeat-associated non-ATG (RAN) translation. RAN proteins, which were first described in spinocerebellar ataxia type 8 (SCA8) and myotonic dystrophy type 1 (DM1), have now been reported in a growing list of microsatellite expansion diseases. This article reviews what is currently known about RAN proteins in microsatellite expansion diseases and experiments that provide clues on how RAN translation is regulated.
