Hypermorphic and hypomorphic AARS alleles in patients with CMT2N expand clinical and molecular heterogeneities.

Abstract:

:Aminoacyl-tRNA synthetases (ARSs) are ubiquitously expressed enzymes implicated in several dominant and recessive disease phenotypes. The canonical function of ARSs is to couple an amino acid to a cognate transfer RNA (tRNA). We identified three novel disease-associated missense mutations in the alanyl-tRNA synthetase (AARS) gene in three families with dominant axonal Charcot-Marie-Tooth (CMT) disease. Two mutations (p.Arg326Trp and p.Glu337Lys) are located near a recurrent pathologic change in AARS, p.Arg329His. The third (p.Ser627Leu) is in the editing domain of the protein in which hitherto only mutations associated with recessive encephalopathies have been described. Yeast complementation assays demonstrated that two mutations (p.Ser627Leu and p.Arg326Trp) represent loss-of-function alleles, while the third (p.Glu337Lys) represents a hypermorphic allele. Further, aminoacylation assays confirmed that the third mutation (p.Glu337Lys) increases tRNA charging velocity. To test the effect of each mutation in the context of a vertebrate nervous system, we developed a zebrafish assay. Remarkably, all three mutations caused a pathological phenotype of neural abnormalities when expressed in zebrafish, while expression of the human wild-type messenger RNA (mRNA) did not. Our data indicate that not only functional null or hypomorphic alleles, but also hypermorphic AARS alleles can cause dominantly inherited axonal CMT disease.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Weterman MAJ,Kuo M,Kenter SB,Gordillo S,Karjosukarso DW,Takase R,Bronk M,Oprescu S,van Ruissen F,Witteveen RJW,Bienfait HME,Breuning M,Verhamme C,Hou YM,de Visser M,Antonellis A,Baas F

doi

10.1093/hmg/ddy290

subject

Has Abstract

pub_date

2018-12-01 00:00:00

pages

4036-4050

issue

23

eissn

0964-6906

issn

1460-2083

pii

5074293

journal_volume

27

pub_type

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