rs967111310

Positions:

• chr2-135907341-C-T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2 PM5 PP3_Strong PP5_Moderate

The NM_001349.4(DARS1):​c.1481G>A​(p.Arg494His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000349 in 1,433,678 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 13/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R494C) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: DARS1 NM_001349.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.69

Genes affected

DARS1 (HGNC:2678): (aspartyl-tRNA synthetase 1) This gene encodes a member of a multienzyme complex that functions in mediating the attachment of amino acids to their cognate tRNAs. The encoded protein ligates L-aspartate to tRNA(Asp). Mutations in this gene have been found in patients showing hypomyelination with brainstem and spinal cord involvement and leg spasticity. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2014]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.98
• PP5: Variant 2-135907341-C-T is Pathogenic according to our data. Variant chr2-135907341-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 522693.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DARS1	NM_001349.4	c.1481G>A	p.Arg494His	missense_variant	16/16	ENST00000264161.9	NP_001340.2
DARS1	NM_001293312.1	c.1181G>A	p.Arg394His	missense_variant	15/15		NP_001280241.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DARS1	ENST00000264161.9	c.1481G>A	p.Arg494His	missense_variant	16/16	1	NM_001349.4	ENSP00000264161	P1
DARS1	ENST00000422708.3	c.542G>A	p.Arg181His	missense_variant	6/6	2		ENSP00000387508
DARS1	ENST00000478212.5	n.375G>A		non_coding_transcript_exon_variant	3/3	2
DARS1	ENST00000489964.5	n.730G>A		non_coding_transcript_exon_variant	5/5	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000349 AC: 5 AN: 1433678 Hom.: 0 Cov.: 30 AF XY: 0.00000280 AC XY: 2 AN XY: 713360

Gnomad4 AFR exome AF: 0.0000309

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: 0.00000365

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000756

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypomyelination with brain stem and spinal cord involvement and leg spasticity Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Genomic Research Center, Shahid Beheshti University of Medical Sciences

May 03, 2020

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.24
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.84	D;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.97
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.37	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Pathogenic	0.98	D
MutationAssessor	Pathogenic	3.6	H;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.88	D
PROVEAN	Pathogenic	-4.4	D;D
REVEL	Pathogenic	0.88
Sift	Uncertain	0.013	D;D
Sift4G	Uncertain	0.015	D;D
Polyphen		1.0	D;.
Vest4		0.66
MutPred		0.90		Loss of MoRF binding (P = 0.0223);.;
MVP		0.96
MPC		0.78
ClinPred		1.0	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.83
gMVP		0.95

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

LitVar

Other links and lift over

dbSNP: rs967111310; hg19: chr2-136664911;