NM_018122.5:c.44C>T

Variant names:

• chr1-173825273-C-T
• rs372766904
• NM_018122.5:c.44C>T

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_Strong BP6_Moderate

The NM_018122.5(DARS2):​c.44C>T​(p.Ser15Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000192 in 1,461,508 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S15C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000019 (0 hom.)
• Consequence: DARS2 NM_018122.5 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.273
• Publications: 0 publications found

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]

DARS2 Gene-Disease associations (from GenCC):

• leukoencephalopathy with brain stem and spinal cord involvement-high lactate syndrome

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, Orphanet
• mitochondrial disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.05488971).
• BP6: Variant 1-173825273-C-T is Benign according to our data. Variant chr1-173825273-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 2968462.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DARS2	NM_018122.5	c.44C>T	p.Ser15Phe	missense_variant	Exon 1 of 17	ENST00000649689.2	NP_060592.2
DARS2	NM_001365212.1	c.44C>T	p.Ser15Phe	missense_variant	Exon 1 of 16		NP_001352141.1
DARS2	NM_001365213.2	c.44C>T	p.Ser15Phe	missense_variant	Exon 1 of 14		NP_001352142.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DARS2	ENST00000649689.2	c.44C>T	p.Ser15Phe	missense_variant	Exon 1 of 17		NM_018122.5	ENSP00000497569.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.0000318 AC: 8 AN: 251492 AF XY: 0.0000589

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.0000192 AC: 28 AN: 1461508 Hom.: 0 Cov.: 30 AF XY: 0.0000303 AC XY: 22 AN XY: 727078

African (AFR) AF: 0.00 AC: 0 AN: 33466

American (AMR) AF: 0.00 AC: 0 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39686

South Asian (SAS) AF: 0.000313 AC: 27 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53350

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111770

Other (OTH) AF: 0.00 AC: 0 AN: 60374

GnomAD4 genome Cov.: 32

ExAC AF: 0.0000494 AC: 6

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

May 19, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	12
DANN	Benign	0.89
DEOGEN2	Benign	0.055	T;.;.;.;T;.;.
Eigen	Benign	-0.88
Eigen_PC	Benign	-0.92
FATHMM_MKL	Benign	0.057	N
LIST_S2	Benign	0.73	.;T;T;T;T;T;T
M_CAP	Benign	0.023	T
MetaRNN	Benign	0.055	T;T;T;T;T;T;T
MetaSVM	Benign	-0.92	T
MutationAssessor	Benign	1.8	L;.;.;.;L;.;.
PhyloP100		0.27
PrimateAI	Benign	0.36	T
PROVEAN	Benign	-0.58	N;.;.;.;.;.;.
REVEL	Benign	0.10
Sift	Benign	0.19	T;.;.;.;.;.;.
Sift4G	Uncertain	0.057	T;.;.;.;.;.;.
Polyphen		0.047	B;.;.;.;B;.;.
Vest4		0.20
MutPred		0.34		Loss of disorder (P = 0.0095);Loss of disorder (P = 0.0095);Loss of disorder (P = 0.0095);Loss of disorder (P = 0.0095);Loss of disorder (P = 0.0095);Loss of disorder (P = 0.0095);Loss of disorder (P = 0.0095);
MVP		0.70
MPC		0.26
ClinPred		0.014	T
GERP RS		-0.37
PromoterAI		-0.020	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.028
gMVP		0.72
Mutation Taster		=95/5	polymorphism

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

Other links and lift over

dbSNP: rs372766904; hg19: chr1-173794411;