1-173825315-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_018122.5(DARS2):c.86T>G(p.Leu29Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: DARS2 NM_018122.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.620

Genes affected

DARS2 (HGNC:25538): (aspartyl-tRNA synthetase 2, mitochondrial) The protein encoded by this gene belongs to the class-II aminoacyl-tRNA synthetase family. It is a mitochondrial enzyme that specifically aminoacylates aspartyl-tRNA. Mutations in this gene are associated with leukoencephalopathy with brainstem and spinal cord involvement and lactate elevation (LBSL). [provided by RefSeq, Nov 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20925784).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DARS2	NM_018122.5	c.86T>G	p.Leu29Arg	missense_variant	1/17	ENST00000649689.2
DARS2	NM_001365212.1	c.86T>G	p.Leu29Arg	missense_variant	1/16
DARS2	NM_001365213.2	c.86T>G	p.Leu29Arg	missense_variant	1/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DARS2	ENST00000649689.2	c.86T>G	p.Leu29Arg	missense_variant	1/17		NM_018122.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Leukoencephalopathy with brain stem and spinal cord involvement-high lactate syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Neuberg Centre For Genomic Medicine, NCGM

-

The missense variant c.86T>G(p.Leu29Arg) in DARS2 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. The p.Leu29Arg variant is novel (not in any individuals) in gnomAD Exomes and 1000 Genomes. The amino acid Leu at position 29 is changed to a Arg changing protein sequence and it might alter its composition and physico-chemical properties. The amino acid change p.Leu29Arg in DARS2 is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. For these reasons, this variant has been classified as Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.072
BayesDel_addAF	Benign	-0.018	T
BayesDel_noAF	Benign	-0.26
Cadd	Benign	13
Dann	Benign	0.90
DEOGEN2	Benign	0.046	T;.;.;.;T;.;.
Eigen	Benign	-0.68
Eigen_PC	Benign	-0.75
FATHMM_MKL	Benign	0.13	N
M_CAP	Benign	0.053	D
MetaRNN	Benign	0.21	T;T;T;T;T;T;T
MetaSVM	Benign	-0.87	T
MutationAssessor	Benign	1.7	L;.;.;.;L;.;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.91	N;.;.;.;.;.;.
REVEL	Benign	0.19
Sift	Benign	0.041	D;.;.;.;.;.;.
Sift4G	Benign	0.099	T;.;.;.;.;.;.
Polyphen		0.43	B;.;.;.;B;.;.
Vest4		0.48
MutPred		0.65		Gain of disorder (P = 0.0088);Gain of disorder (P = 0.0088);Gain of disorder (P = 0.0088);Gain of disorder (P = 0.0088);Gain of disorder (P = 0.0088);Gain of disorder (P = 0.0088);Gain of disorder (P = 0.0088);
MVP		0.70
MPC		0.50
ClinPred		0.11	T
GERP RS		0.027
Varity_R		0.23
gMVP		0.70

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: chr1-173794453;