5-168486499-A-G

Variant names:

• chr5-168486499-A-G
• rs672601375
• NM_002887.4:c.1A>G

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 12P and 1B. PVS1_Moderate PS1_Moderate PP5_Very_Strong BS2_Supporting

The NM_002887.4(RARS1):​c.1A>G​(p.Met1?) variant causes a start lost change. The variant allele was found at a frequency of 0.0000103 in 1,558,408 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 Pathogenic (★★).

• Frequency:
  • Genomes: 𝑓 0.000033 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0000078 (0 hom.)
• Consequence: RARS1 NM_002887.4 start_lost
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 5.33

Genes affected

RARS1 (HGNC:9870): (arginyl-tRNA synthetase 1) Aminoacyl-tRNA synthetases catalyze the aminoacylation of tRNA by their cognate amino acid. Because of their central role in linking amino acids with nucleotide triplets contained in tRNAs, aminoacyl-tRNA synthetases are thought to be among the first proteins that appeared in evolution. Arginyl-tRNA synthetase belongs to the class-I aminoacyl-tRNA synthetase family. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 1 pathogenic variants. Next in-frame start position is after 216 CDS bases. Genomic position: 168492694. Lost 0.109 part of the original CDS.
• PS1: Another start lost variant in NM_002887.4 (RARS1) was described as [Pathogenic] in Lovd
• PP5: Variant 5-168486499-A-G is Pathogenic according to our data. Variant chr5-168486499-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 162083.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS2: High AC in GnomAd4 at 5 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RARS1	NM_002887.4	c.1A>G	p.Met1?	start_lost	Exon 1 of 15	ENST00000231572.8	NP_002878.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RARS1	ENST00000231572.8	c.1A>G	p.Met1?	start_lost	Exon 1 of 15	1	NM_002887.4	ENSP00000231572.3

Frequencies

GnomAD3 genomes AF: 0.0000329 AC: 5 AN: 152094 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000576

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

GnomAD3 exomes AF: 0.0000181 AC: 3 AN: 165944 Hom.: 0 AF XY: 0.0000229 AC XY: 2 AN XY: 87510

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000791

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000302

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000782 AC: 11 AN: 1406314 Hom.: 0 Cov.: 30 AF XY: 0.00000576 AC XY: 4 AN XY: 694044

Gnomad4 AFR exome AF: 0.0000308

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.0000397

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000832

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000329 AC: 5 AN: 152094 Hom.: 0 Cov.: 33 AF XY: 0.0000269 AC XY: 2 AN XY: 74270

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.000576

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000189

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hypomyelinating leukodystrophy 9 Pathogenic:2

Sep 01, 2022

3billion, Medical Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: 0.003%). Start-lost is reinitiation of translation may occur at a downstream alternate start codon but still result in a loss or disruption of normal protein function as there have been pathogenic variants reported upstream of the alternate start codon. The variant has been reported to be in trans with a pathogenic variant as either compound heterozygous or homozygous in at least one similarly affected unrelated individual (PMID: 24777941). The variant has been reported at least twice as pathogenic with clinical assertions and evidence for the classification (ClinVar ID: VCV000162083 / PMID: 24777941). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline. -

Apr 29, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

not provided Pathogenic:2

Apr 30, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Variants that affect the same initiator codon have been observed in individuals affected with clinical features of hypomyelinating leukodystrophy (PMID: 24777941, 27848944, 30791064, Invitae). ClinVar contains an entry for this variant (Variation ID: 162083). This variant is not present in population databases (ExAC no frequency). This sequence change affects the initiator methionine of the RARS mRNA. The next in-frame methionine is located at codon 73. -

Jan 17, 2019

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1 A>G pathogenic variant in the RARS gene has previously been reported in association with hypomyelinating leukodystrophy in an individual who was compound heterozygous for another variant in RARs (Wolf et al., 2014). The pathogenic variant alters the initiator Methionine codon, and the resultant protein would be described as p.Met1? using a question mark to signify that it is not known if the loss of Met1 means that all protein translation is completely prevented or if an abnormal protein is produced using an alternate Met. Additionally, the c.1 A>G variant was not observed in approximately 6,400 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. In summary, we interpret c.1 A>G to be a pathogenic variant." -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Pathogenic	0.23
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.17	T;T
Eigen	Uncertain	0.39
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Pathogenic	0.73	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Benign	-0.39	T
PROVEAN	Benign	-0.63	N;.
REVEL	Uncertain	0.46
Sift	Pathogenic	0.0	D;.
Sift4G	Uncertain	0.034	D;D
Polyphen		0.71	P;.
Vest4		0.82
MutPred		1.0		Gain of sheet (P = 0.0149);Gain of sheet (P = 0.0149);
MVP		0.76
ClinPred		1.0	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.94
gMVP		0.66

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.10		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: rs672601375; hg19: chr5-167913504;