7-30628565-G-A

Position:

• chr7-30628565-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3 PP5_Moderate

The NM_002047.4(GARS1):​c.1705G>A​(p.Glu569Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GARS1 NM_002047.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.96

Genes affected

GARS1 (HGNC:4162): (glycyl-tRNA synthetase 1) This gene encodes glycyl-tRNA synthetase, one of the aminoacyl-tRNA synthetases that charge tRNAs with their cognate amino acids. The encoded enzyme is an (alpha)2 dimer which belongs to the class II family of tRNA synthetases. It has been shown to be a target of autoantibodies in the human autoimmune diseases, polymyositis or dermatomyositis. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.805
• PP5: Variant 7-30628565-G-A is Pathogenic according to our data. Variant chr7-30628565-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 410315.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr7-30628565-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GARS1	NM_002047.4	c.1705G>A	p.Glu569Lys	missense_variant	14/17	ENST00000389266.8	NP_002038.2
GARS1	NM_001316772.1	c.1543G>A	p.Glu515Lys	missense_variant	14/17		NP_001303701.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GARS1	ENST00000389266.8	c.1705G>A	p.Glu569Lys	missense_variant	14/17	1	NM_002047.4	ENSP00000373918	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease type 2 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 03, 2019

In summary, this variant is a novel missense change that has been shown to arise de novo in an affected individual. This evidence indicates that the variant is pathogenic, but additional data is needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies. Family studies have indicated that this variant was not present in the parents of an individual affected with distal spinal muscular atrophy, which suggests that it was de novo in that affected individual (Invitae). This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a GARS-related disease. This sequence change replaces glutamic acid with lysine at codon 569 of the GARS protein (p.Glu569Lys). The glutamic acid residue is highly conserved and there is a small physicochemical difference between glutamic acid and lysine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.57
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Uncertain	0.13
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.58	D
Eigen	Benign	0.17
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.81	D
MetaSVM	Uncertain	-0.27	T
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-3.6	D
REVEL	Uncertain	0.53
Sift	Benign	0.22	T
Sift4G	Benign	0.26	T
Polyphen		0.084	B
Vest4		0.75
MutPred		0.56		Gain of methylation at E569 (P = 0.0157);
MVP		0.87
MPC		0.92
ClinPred		0.97	D
GERP RS		5.6
Varity_R		0.69
gMVP		0.66

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1060502839; hg19: chr7-30668181;