chr2-135985458-G-A

Position:

• chr2-135985458-G-A

Variant summary

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

The NM_001349.4(DARS1):​c.11C>T​(p.Ala4Val) 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. 15/21 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: DARS1 NM_001349.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.56

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-AS1 (HGNC:40170): (DARS1 antisense RNA 1)

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=0.0824624).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DARS1	NM_001349.4	c.11C>T	p.Ala4Val	missense_variant	1/16	ENST00000264161.9	NP_001340.2
DARS1-AS1	NR_110199.1	n.283G>A		non_coding_transcript_exon_variant	1/4
DARS1	NM_001293312.1	c.-232C>T		5_prime_UTR_variant	1/15		NP_001280241.1
DARS1-AS1	NR_110200.1	n.283G>A		non_coding_transcript_exon_variant	1/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DARS1	ENST00000264161.9	c.11C>T	p.Ala4Val	missense_variant	1/16	1	NM_001349.4	ENSP00000264161	P1
DARS1-AS1	ENST00000692958.1	n.335G>A		non_coding_transcript_exon_variant	1/4

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

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 29, 2024

The c.11C>T (p.A4V) alteration is located in exon 1 (coding exon 1) of the DARS gene. This alteration results from a C to T substitution at nucleotide position 11, causing the alanine (A) at amino acid position 4 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	0.0066	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.12	T
Eigen	Benign	-0.31
Eigen_PC	Benign	-0.12
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.70	T
M_CAP	Benign	0.031	D
MetaRNN	Benign	0.082	T
MetaSVM	Benign	-0.69	T
MutationAssessor	Benign	0.0	N
MutationTaster	Benign	0.99	D;D
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.26
Sift	Benign	0.066	T
Sift4G	Benign	0.14	T
Polyphen		0.0	B
Vest4		0.19
MutPred		0.13		Loss of glycosylation at P2 (P = 0.0609);
MVP		0.81
MPC		0.17
ClinPred		0.38	T
GERP RS		4.0
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.7
Varity_R		0.092
gMVP		0.43

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: chr2-136743028;