Genetic Variant QARS1:p.Leu9Ile (chr3-49104709-G-T) – ACMG Classification: Benign (-13 pts)

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_005051.3(QARS1):c.25C>A(p.Leu9Ile) variant causes a missense change. The variant allele was found at a frequency of 0.00206 in 1,612,830 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L9V) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0021 ( 2 hom., cov: 32)

Exomes 𝑓: 0.0021 ( 2 hom. )

Consequence

QARS1
NM_005051.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:6

Conservation

PhyloP100: 4.21

Publications

7 publications found

Variant links:

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

QARS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.014008164).

BP6

Variant 3-49104709-G-T is Benign according to our data. Variant chr3-49104709-G-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 384247.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.00213 (324/152372) while in subpopulation AMR AF = 0.00287 (44/15310). AF 95% confidence interval is 0.0023. There are 2 homozygotes in GnomAd4. There are 176 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 2 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005051.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
QARS1	NM_005051.3	MANE Select	c.25C>A	p.Leu9Ile	missense	Exon 1 of 24	NP_005042.1	P47897-1
QARS1	NM_001272073.2		c.25C>A	p.Leu9Ile	missense	Exon 1 of 24	NP_001259002.1	P47897-2
QARS1	NR_073590.2		n.49C>A		non_coding_transcript_exon	Exon 1 of 24

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
QARS1	ENST00000306125.12	TSL:1 MANE Select	c.25C>A	p.Leu9Ile	missense	Exon 1 of 24	ENSP00000307567.6	P47897-1
QARS1	ENST00000482438.2	TSL:1	n.51C>A		non_coding_transcript_exon	Exon 1 of 2
QARS1	ENST00000634609.1	TSL:1	n.50C>A		non_coding_transcript_exon	Exon 1 of 5

Frequencies

GnomAD3 genomes

AF:

0.00213

AC:

324

AN:

152254

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00288

Gnomad ASJ

AF:

0.00115

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00838

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00262

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00266

AC:

662

AN:

248470

AF XY:

0.00275

show subpopulations

Gnomad AFR exome

AF:

0.000250

Gnomad AMR exome

AF:

0.00165

Gnomad ASJ exome

AF:

0.00170

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00925

Gnomad NFE exome

AF:

0.00310

Gnomad OTH exome

AF:

0.00379

GnomAD4 exome

AF:

0.00205

AC:

2995

AN:

1460458

Hom.:

Cov.:

AF XY:

0.00205

AC XY:

1491

AN XY:

726316

show subpopulations

African (AFR)

AF:

0.000299

AC:

AN:

33470

American (AMR)

AF:

0.00159

AC:

AN:

44714

Ashkenazi Jewish (ASJ)

AF:

0.00153

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39664

South Asian (SAS)

AF:

0.000545

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00936

AC:

494

AN:

52806

Middle Eastern (MID)

AF:

0.00121

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00199

AC:

2212

AN:

1111332

Other (OTH)

AF:

0.00189

AC:

114

AN:

60320

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.457

Heterozygous variant carriers

153

306

460

613

766

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

152

228

304

380

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00213

AC:

324

AN:

152372

Hom.:

Cov.:

AF XY:

0.00236

AC XY:

176

AN XY:

74512

show subpopulations

African (AFR)

AF:

0.000168

AC:

AN:

41596

American (AMR)

AF:

0.00287

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.00115

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5180

South Asian (SAS)

AF:

0.000414

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00838

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00262

AC:

178

AN:

68042

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.503

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00192

Hom.:

Bravo

AF:

0.00165

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.00182

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00279

AC:

ExAC

AF:

0.00294

AC:

357

EpiCase

AF:

0.00245

EpiControl

AF:

0.00296

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (4)

Diffuse cerebral and cerebellar atrophy - intractable seizures - progressive microcephaly syndrome (3)

QARS1-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.077

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.30

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.44

Eigen

Uncertain

0.57

Eigen_PC

Uncertain

0.49

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.84

MetaRNN

Benign

0.014

MetaSVM

Benign

-0.81

MutationAssessor

Uncertain

2.7

PhyloP100

4.2

PrimateAI

Uncertain

0.54

PROVEAN

Benign

-1.1

REVEL

Benign

0.26

Sift

Uncertain

0.0050

Sift4G

Uncertain

0.015

Polyphen

1.0

Vest4

0.42

MVP

0.46

MPC

1.0

ClinPred

0.039

GERP RS

4.5

PromoterAI

-0.025

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.66

gMVP

0.19

Mutation Taster

=82/18

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over