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Cell Physiol Biochem. 2019;52(5):970-983. doi: 10.33594/000000067.

A Novel Caenorhabditis Elegans Proteinopathy Model Shows Changes in mRNA Translational Frameshifting During Aging.

Author information

1
Department of Chemistry and Biochemistry, University of Hamburg, Hamburg, Germany.
2
MDI Biological Laboratory, Davis Center for Regenerative Biology and Medicine, Salisbury Cove, ME, USA.
3
Department of Biotechnology, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria.
4
MDI Biological Laboratory, Davis Center for Regenerative Biology and Medicine, Salisbury Cove, ME, USA, arogers@mdibl.org.
5
Department of Chemistry and Biochemistry, University of Hamburg, Hamburg, Germany, zoya.ignatova@uni-hamburg.de.

Abstract

BACKGROUND/AIMS:

Regulation of mRNA translation is central to protein homeostasis and is optimized for speed and accuracy. Spontaneous recoding events occur virtually at any codon but at very low frequency and are commonly assumed to increase as the cell ages.

METHODS:

Here, we leveraged the polyglutamine(polyQ)-frameshifting model of huntingtin exon 1 with CAG repeat length in the pathological range (Htt51Q), which undergoes enhanced non-programmed translational -1 frameshifting.

RESULTS:

In body muscle cells of Caenorhabditis elegans, -1 frameshifting occured at the onset of expression of the zero-frame product, correlated with mRNA level of the non-frameshifted expression and formed aggregates correlated with reduced motility in C. elegans. Spontaneous frameshifting was modulated by IFG-1, the homologue of the nutrient-responsive eukaryotic initiation factor 4G (eIF4G), under normal growth conditions and NSUN-5, a conserved ribosomal RNA methyltransferase, under osmotic stress.

CONCLUSION:

Our results suggest that frameshifting and aggregation occur at even early stages of development and, because of their intrinsic stability, may persist and accelerate the onset of age-related proteinopathies.

KEYWORDS:

Aggregation; Aging; C. elegans; CAG repeat; Frameshifting; Polyglutamine; Translation

PMID:
30977983
DOI:
10.33594/000000067
[Indexed for MEDLINE]
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