chr2-135911174-C-A

Variant names:

• chr2-135911174-C-A
• rs587776985
• NM_001349.4:c.1379G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2 PM5 PP2 PP3_Moderate

The NM_001349.4(DARS1):​c.1379G>T​(p.Arg460Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000658 in 152,046 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 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. R460H) has been classified as Pathogenic.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: DARS1 NM_001349.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.57
• Publications: 2 publications found

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]

DARS1 Gene-Disease associations (from GenCC):

• hypomyelination with brain stem and spinal cord involvement and leg spasticity

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-135911174-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 50990.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 10 curated pathogenic missense variants (we use a threshold of 10). The gene has 3 curated benign missense variants. Gene score misZ: 0.74697 (below the threshold of 3.09). Trascript score misZ: 0.93713 (below the threshold of 3.09). GenCC associations: The gene is linked to hypomyelination with brain stem and spinal cord involvement and leg spasticity.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.916

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001349.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DARS1	NM_001349.4	MANE Select	c.1379G>T	p.Arg460Leu	missense	Exon 15 of 16	NP_001340.2
	DARS1	NM_001293312.1		c.1079G>T	p.Arg360Leu	missense	Exon 14 of 15	NP_001280241.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DARS1	ENST00000264161.9	TSL:1 MANE Select	c.1379G>T	p.Arg460Leu	missense	Exon 15 of 16	ENSP00000264161.4
	DARS1	ENST00000422708.3	TSL:2	c.440G>T	p.Arg147Leu	missense	Exon 5 of 6	ENSP00000387508.1
	DARS1	ENST00000478212.5	TSL:2	n.273G>T		non_coding_transcript_exon	Exon 2 of 3

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152046 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 1398848 Hom.: 0 Cov.: 23 AF XY: 0.00 AC XY: 0 AN XY: 699882

African (AFR) AF: 0.00 AC: 0 AN: 32120

American (AMR) AF: 0.00 AC: 0 AN: 44548

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25712

East Asian (EAS) AF: 0.00 AC: 0 AN: 39332

South Asian (SAS) AF: 0.00 AC: 0 AN: 84864

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53372

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5606

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1055076

Other (OTH) AF: 0.00 AC: 0 AN: 58218

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152046 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74260

African (AFR) AF: 0.00 AC: 0 AN: 41390

American (AMR) AF: 0.00 AC: 0 AN: 15258

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5198

South Asian (SAS) AF: 0.00 AC: 0 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10600

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 67988

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.43
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.36
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.86	D
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.94
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.45	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Pathogenic	0.86	D
MutationAssessor	Pathogenic	3.5	H
PhyloP100		7.6
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-5.3	D
REVEL	Uncertain	0.60
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.0040	D
Polyphen		0.99	D
Vest4		0.89
MutPred		0.61		Loss of methylation at R460 (P = 0.0095)
MVP		0.97
MPC		0.78
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.80
gMVP		0.89
Mutation Taster		=7/93	disease causing

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: rs587776985; hg19: chr2-136668744;