chr6-31779170-C-T

Variant names:

• chr6-31779170-C-T
• NM_006295.3:c.3523G>A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_006295.3(VARS1):​c.3523G>A​(p.Gly1175Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: VARS1 NM_006295.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.12

Genes affected

VARS1 (HGNC:12651): (valyl-tRNA synthetase 1) Aminoacyl-tRNA synthetases catalyze the aminoacylation of tRNA by their cognate amino acid. Because of their central role in linking amino acids with nucleotide triplets contained in tRNAs, aminoacyl-tRNA synthetases are thought to be among the first proteins that appeared in evolution. The protein encoded by this gene belongs to class-I aminoacyl-tRNA synthetase family and is located in the class III region of the major histocompatibility complex. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the VARS1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 14 curated pathogenic missense variants (we use a threshold of 10). The gene has 12 curated benign missense variants. Gene score misZ: 2.6849 (below the threshold of 3.09). Trascript score misZ: 3.4812 (above the threshold of 3.09). GenCC associations: The gene is linked to combined oxidative phosphorylation defect type 20, neurodevelopmental disorder with microcephaly, seizures, and cortical atrophy.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
VARS1	NM_006295.3	c.3523G>A	p.Gly1175Ser	missense_variant	Exon 29 of 30	ENST00000375663.8	NP_006286.1
VARS1	XM_005249362.3	c.3526G>A	p.Gly1176Ser	missense_variant	Exon 29 of 30		XP_005249419.1
VARS1	XM_047419296.1	c.3526G>A	p.Gly1176Ser	missense_variant	Exon 28 of 29		XP_047275252.1
VARS1	XM_047419297.1	c.3523G>A	p.Gly1175Ser	missense_variant	Exon 28 of 29		XP_047275253.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
VARS1	ENST00000375663.8	c.3523G>A	p.Gly1175Ser	missense_variant	Exon 29 of 30	1	NM_006295.3	ENSP00000364815.3
VARS1	ENST00000463184.1	n.*60G>A		downstream_gene_variant		2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Aug 19, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.3523G>A (p.G1175S) alteration is located in exon 29 (coding exon 28) of the VARS gene. This alteration results from a G to A substitution at nucleotide position 3523, causing the glycine (G) at amino acid position 1175 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Benign	-0.093	T
BayesDel_noAF	Benign	-0.37
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.13	T
Eigen	Uncertain	0.36
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Uncertain	0.93	D
M_CAP	Benign	0.059	D
MetaRNN	Uncertain	0.65	D
MetaSVM	Benign	-1.2	T
MutationAssessor	Uncertain	2.6	M
PrimateAI	Uncertain	0.72	T
PROVEAN	Pathogenic	-4.5	D
REVEL	Benign	0.24
Sift	Benign	0.045	D
Sift4G	Uncertain	0.057	T
Polyphen		1.0	D
Vest4		0.57
MutPred		0.40		Gain of glycosylation at G1175 (P = 0.0047);
MVP		0.42
MPC		1.3
ClinPred		0.98	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.23
gMVP		0.72

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-31746947;