NM_005051.3:c.769C>G

Variant names:

• chr3-49101640-G-C
• rs1037854666
• NM_005051.3:c.769C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_005051.3(QARS1):​c.769C>G​(p.Leu257Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,594 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign 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. L257M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: QARS1 NM_005051.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.134
• Publications: 0 publications found

Genes affected

QARS1 (HGNC:9751): (glutaminyl-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. In metazoans, 9 aminoacyl-tRNA synthetases specific for glutamine (gln), glutamic acid (glu), and 7 other amino acids are associated within a multienzyme complex. Although present in eukaryotes, glutaminyl-tRNA synthetase (QARS) is absent from many prokaryotes, mitochondria, and chloroplasts, in which Gln-tRNA(Gln) is formed by transamidation of the misacylated Glu-tRNA(Gln). Glutaminyl-tRNA synthetase belongs to the class-I aminoacyl-tRNA synthetase family. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2013]

QARS1 Gene-Disease associations (from GenCC):

• diffuse cerebral and cerebellar atrophy - intractable seizures - progressive microcephaly syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, ClinGen, Orphanet
• microcephaly-short stature-intellectual disability-facial dysmorphism syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17537653).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
QARS1	NM_005051.3	c.769C>G	p.Leu257Val	missense_variant	Exon 9 of 24	ENST00000306125.12	NP_005042.1
QARS1	NM_001272073.2	c.736C>G	p.Leu246Val	missense_variant	Exon 9 of 24		NP_001259002.1
QARS1	XM_017006965.3	c.769C>G	p.Leu257Val	missense_variant	Exon 9 of 23		XP_016862454.2
QARS1	NR_073590.2	n.744C>G		non_coding_transcript_exon_variant	Exon 9 of 24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
QARS1	ENST00000306125.12	c.769C>G	p.Leu257Val	missense_variant	Exon 9 of 24	1	NM_005051.3	ENSP00000307567.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461594 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727096

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33474

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53410

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5540

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111998

Other (OTH) AF: 0.00 AC: 0 AN: 60366

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	17
DANN	Benign	0.96
DEOGEN2	Benign	0.17	T;.;T;T;T;.
Eigen	Benign	-0.63
Eigen_PC	Benign	-0.56
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.97	D;D;D;D;D;D
M_CAP	Benign	0.0091	T
MetaRNN	Benign	0.18	T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.2	L;.;.;.;.;.
PhyloP100		0.13
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-1.9	N;N;.;.;.;N
REVEL	Benign	0.033
Sift	Benign	0.12	T;T;.;.;.;D
Sift4G	Benign	0.097	T;T;T;T;.;T
Polyphen		0.34	B;.;.;.;.;.
Vest4		0.40
MutPred		0.40		Loss of helix (P = 0.028);.;.;Loss of helix (P = 0.028);.;.;
MVP		0.22
MPC		0.43
ClinPred		0.15	T
GERP RS		-0.68
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.098
gMVP		0.77
Mutation Taster		=69/31	polymorphism

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: rs1037854666; hg19: chr3-49139073;