chr16-75627929-G-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_005548.3(KARS1):c.1760C>A(p.Thr587Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000755 in 1,456,928 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. T587T) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000076 ( 0 hom. )

Consequence

KARS1
NM_005548.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.366

Publications

0 publications found

Variant links:

Genes affected

KARS1 (HGNC:6215): (lysyl-tRNA synthetase 1) Aminoacyl-tRNA synthetases are a class of enzymes that charge tRNAs with their cognate amino acids. Lysyl-tRNA synthetase is a homodimer localized to the cytoplasm which belongs to the class II family of tRNA synthetases. It has been shown to be a target of autoantibodies in the human autoimmune diseases, polymyositis or dermatomyositis. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

KARS1 Gene-Disease associations (from GenCC):

autosomal recessive nonsyndromic hearing loss 89
Inheritance: AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), G2P
leukoencephalopathy, progressive, infantile-onset, with or without deafness
Inheritance: AR Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
Charcot-Marie-Tooth disease recessive intermediate B
Inheritance: AR, Unknown Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
hearing loss, autosomal recessive
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
nonsyndromic genetic hearing loss
Inheritance: AR Classification: LIMITED Submitted by: ClinGen

KARS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.05080864).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KARS1	NM_005548.3 link	c.1760C>A	p.Thr587Lys	missense_variant	Exon 14 of 14	ENST00000302445.8	NP_005539.1	Q15046-1
KARS1	NM_001130089.2 link	c.1844C>A	p.Thr615Lys	missense_variant	Exon 15 of 15		NP_001123561.1	Q15046-2
KARS1	NM_001378148.1 link	c.1292C>A	p.Thr431Lys	missense_variant	Exon 14 of 14		NP_001365077.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KARS1	ENST00000302445.8 link	c.1760C>A	p.Thr587Lys	missense_variant	Exon 14 of 14	1	NM_005548.3	ENSP00000303043.3		Q15046-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000159

AC:

AN:

251370

AF XY:

0.0000221

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000755

AC:

AN:

1456928

Hom.:

Cov.:

AF XY:

0.00000827

AC XY:

AN XY:

725226

show subpopulations

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

African (AFR)

AF:

0.00

AC:

AN:

33320

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26098

East Asian (EAS)

AF:

0.00

AC:

AN:

39664

South Asian (SAS)

AF:

0.0000929

AC:

AN:

86136

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53416

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1107588

Other (OTH)

AF:

0.0000498

AC:

AN:

60224

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000005), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.393

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Sep 24, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1844C>A (p.T615K) alteration is located in exon 15 (coding exon 14) of the KARS gene. This alteration results from a C to A substitution at nucleotide position 1844, causing the threonine (T) at amino acid position 615 to be replaced by a lysine (K). 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

0.093

BayesDel_addAF

Benign

-0.23

BayesDel_noAF

Benign

-0.33

CADD

Benign

3.8

(source)

DANN

Benign

0.55

DEOGEN2

Benign

0.15

.;T

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.29

LIST_S2

Benign

0.57

T;T

M_CAP

Benign

0.016

MetaRNN

Benign

0.051

T;T

MetaSVM

Benign

-0.95

MutationAssessor

Benign

0.34

.;N

PhyloP100

0.37

PrimateAI

Benign

0.31

PROVEAN

Benign

0.010

N;N

REVEL

Benign

0.15

Sift

Benign

0.59

T;T

Sift4G

Benign

0.93

T;T

Polyphen

0.0090

B;B

Vest4

0.16

MutPred

0.33

.;Gain of ubiquitination at T587 (P = 0.0022);

MVP

0.62

MPC

0.13

ClinPred

0.021

GERP RS

1.1

Varity_R

0.29

gMVP

0.50

Mutation Taster

=93/7

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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chr16-75627929-G-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over