chr2-135943412-C-G

Position:

• chr2-135943412-C-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Moderate PP5_Moderate

The NM_001349.4(DARS1):​c.389G>C​(p.Cys130Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,382 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DARS1 NM_001349.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.62

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 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.866
• PP5: Variant 2-135943412-C-G is Pathogenic according to our data. Variant chr2-135943412-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 402207.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr2-135943412-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DARS1	NM_001349.4	c.389G>C	p.Cys130Ser	missense_variant	5/16	ENST00000264161.9	NP_001340.2
DARS1	NM_001293312.1	c.89G>C	p.Cys30Ser	missense_variant	4/15		NP_001280241.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DARS1	ENST00000264161.9	c.389G>C	p.Cys130Ser	missense_variant	5/16	1	NM_001349.4	ENSP00000264161.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461382 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727018

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Abnormal brain morphology Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

Lupski Lab, Baylor-Hopkins CMG, Baylor College of Medicine

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.88
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.25
CADD	Uncertain	25
DANN	Benign	0.95
DEOGEN2	Benign	0.20	T;T;.;T
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.55
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	D;D;D;D
M_CAP	Uncertain	0.097	D
MetaRNN	Pathogenic	0.87	D;D;D;D
MetaSVM	Uncertain	0.27	D
MutationAssessor	Benign	1.7	L;.;.;.
PrimateAI	Uncertain	0.70	T
PROVEAN	Pathogenic	-8.6	D;D;D;D
REVEL	Pathogenic	0.77
Sift	Benign	0.069	T;D;D;D
Sift4G	Benign	0.098	T;T;.;.
Polyphen		0.48	P;.;.;.
Vest4		0.80
MutPred		0.66		Gain of disorder (P = 3e-04);.;.;.;
MVP		0.93
MPC		0.48
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.86
gMVP		0.58

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: rs1060499772; hg19: chr2-136700982;