3-49099761-C-T
Position:
Variant summary
Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PP3_Strong
The NM_005051.3(QARS1):c.1388G>A(p.Arg463Gln) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.0000041 in 1,461,682 control chromosomes in the GnomAD database, with no homozygous occurrence. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 0.0000041 ( 0 hom. )
Consequence
QARS1
NM_005051.3 missense, splice_region
NM_005051.3 missense, splice_region
Scores
4
10
5
Splicing: ADA: 1.000
2
Clinical Significance
Conservation
PhyloP100: 6.35
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]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 6 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
PP3
Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
QARS1 | NM_005051.3 | c.1388G>A | p.Arg463Gln | missense_variant, splice_region_variant | 15/24 | ENST00000306125.12 | |
QARS1 | NM_001272073.2 | c.1355G>A | p.Arg452Gln | missense_variant, splice_region_variant | 15/24 | ||
QARS1 | XM_017006965.3 | c.1388G>A | p.Arg463Gln | missense_variant, splice_region_variant | 15/23 | ||
QARS1 | NR_073590.2 | n.1363G>A | splice_region_variant, non_coding_transcript_exon_variant | 15/24 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
QARS1 | ENST00000306125.12 | c.1388G>A | p.Arg463Gln | missense_variant, splice_region_variant | 15/24 | 1 | NM_005051.3 | P1 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
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32
GnomAD3 exomes AF: 0.00000399 AC: 1AN: 250922Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 135616
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GnomAD4 exome AF: 0.00000410 AC: 6AN: 1461682Hom.: 0 Cov.: 35 AF XY: 0.00000413 AC XY: 3AN XY: 727150
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GnomAD4 genome Cov.: 32
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Diffuse cerebral and cerebellar atrophy - intractable seizures - progressive microcephaly syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Sep 15, 2019 | Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with QARS-related disease. This variant is not present in population databases (ExAC no frequency). Nucleotide substitutions within the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site, but this prediction has not been confirmed by published transcriptional studies. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This sequence change replaces arginine with glutamine at codon 463 of the QARS protein (p.Arg463Gln). The arginine residue is highly conserved and there is a small physicochemical difference between arginine and glutamine. This variant also falls at the last nucleotide of exon 15 of the QARS coding sequence, which is part of the consensus splice site for this exon. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Uncertain
D
BayesDel_noAF
Benign
CADD
Pathogenic
DANN
Pathogenic
DEOGEN2
Uncertain
D;.;D
Eigen
Pathogenic
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D;D;D
M_CAP
Benign
D
MetaRNN
Uncertain
D;D;D
MetaSVM
Benign
T
MutationAssessor
Benign
M;.;.
MutationTaster
Benign
D;D
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D;D;.
REVEL
Uncertain
Sift
Uncertain
D;D;.
Sift4G
Uncertain
D;D;D
Polyphen
D;.;.
Vest4
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Pathogenic
dbscSNV1_RF
Pathogenic
SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_DL_spliceai
Position offset: 0
Find out detailed SpliceAI scores and Pangolin per-transcript scores at