NM_020442.6:c.1168G>T

Variant names:

• chr6-30920091-G-T
• NM_020442.6:c.1168G>T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM5

The NM_020442.6(VARS2):​c.1168G>T​(p.Ala390Ser) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000072 in 1,388,478 control chromosomes in the GnomAD database, with no homozygous occurrence. 1/1 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A390T) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: VARS2 NM_020442.6 missense, splice_region
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 8.79

Genes affected

VARS2 (HGNC:21642): (valyl-tRNA synthetase 2, mitochondrial) This gene encodes a mitochondrial aminoacyl-tRNA synthetase, which catalyzes the attachment of valine to tRNA(Val) for mitochondrial translation. Mutations in this gene cause combined oxidative phosphorylation deficiency-20, and are also associated with early-onset mitochondrial encephalopathies. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, Aug 2014]

ENSG00000288473 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr6-30920091-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
VARS2	NM_020442.6	c.1168G>T	p.Ala390Ser	missense_variant, splice_region_variant	Exon 13 of 30	ENST00000676266.1	NP_065175.4
VARS2	NM_001167734.2	c.1258G>T	p.Ala420Ser	missense_variant, splice_region_variant	Exon 13 of 30		NP_001161206.1
VARS2	NM_001167733.3	c.748G>T	p.Ala250Ser	missense_variant, splice_region_variant	Exon 12 of 29		NP_001161205.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
VARS2	ENST00000676266.1	c.1168G>T	p.Ala390Ser	missense_variant, splice_region_variant	Exon 13 of 30		NM_020442.6	ENSP00000502585.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.20e-7 AC: 1 AN: 1388478 Hom.: 0 Cov.: 51 AF XY: 0.00 AC XY: 0 AN XY: 683432

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.28e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.29
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.16	T;.;.
Eigen	Pathogenic	0.83
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	0.99	D;D;D
M_CAP	Benign	0.039	D
MetaRNN	Uncertain	0.67	D;D;D
MetaSVM	Benign	-0.44	T
MutationAssessor	Pathogenic	3.5	M;.;.
PrimateAI	Uncertain	0.65	T
PROVEAN	Uncertain	-2.6	D;.;D
REVEL	Uncertain	0.43
Sift	Uncertain	0.0010	D;.;D
Sift4G	Uncertain	0.0030	D;D;D
Polyphen		1.0	D;.;.
Vest4		0.53
MutPred		0.70		Gain of glycosylation at A390 (P = 0.0128);.;.;
MVP		0.78
MPC		1.3
ClinPred		0.99	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.81
gMVP		0.85

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-30887868;