16-75627985-A-T

Variant names:

• chr16-75627985-A-T
• rs549959474
• NM_005548.3:c.1704T>A

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_005548.3(KARS1):​c.1704T>A​(p.Leu568Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000126 in 1,591,612 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. L568L) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: KARS1 NM_005548.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.244
• Publications: 0 publications found

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

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.09533462).
• BP7: Synonymous conserved (PhyloP=0.244 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KARS1	NM_005548.3	c.1704T>A	p.Leu568Leu	synonymous_variant	Exon 14 of 14	ENST00000302445.8	NP_005539.1
KARS1	NM_001130089.2	c.1788T>A	p.Leu596Leu	synonymous_variant	Exon 15 of 15		NP_001123561.1
KARS1	NM_001378148.1	c.1236T>A	p.Leu412Leu	synonymous_variant	Exon 14 of 14		NP_001365077.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KARS1	ENST00000302445.8	c.1704T>A	p.Leu568Leu	synonymous_variant	Exon 14 of 14	1	NM_005548.3	ENSP00000303043.3

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152230 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.00000399 AC: 1 AN: 250734 AF XY: 0.00000737

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: 6.95e-7 AC: 1 AN: 1439264 Hom.: 0 Cov.: 26 AF XY: 0.00000139 AC XY: 1 AN XY: 717530

African (AFR) AF: 0.00 AC: 0 AN: 32974

American (AMR) AF: 0.00 AC: 0 AN: 44694

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25996

East Asian (EAS) AF: 0.00 AC: 0 AN: 39598

South Asian (SAS) AF: 0.0000117 AC: 1 AN: 85824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53408

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5736

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1091468

Other (OTH) AF: 0.00 AC: 0 AN: 59566

GnomAD4 genome AF: 0.00000656 AC: 1 AN: 152348 Hom.: 0 Cov.: 33 AF XY: 0.0000134 AC XY: 1 AN XY: 74502

African (AFR) AF: 0.00 AC: 0 AN: 41576

American (AMR) AF: 0.00 AC: 0 AN: 15312

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.000207 AC: 1 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10624

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68022

Other (OTH) AF: 0.00 AC: 0 AN: 2114

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.63
CADD	Benign	4.8
DANN	Benign	0.89
FATHMM_MKL	Uncertain	0.79	D
LIST_S2	Benign	0.29	T
M_CAP	Benign	0.0090	T
MetaRNN	Benign	0.095	T
PhyloP100		0.24
PROVEAN	Benign	-0.49	N
Sift	Pathogenic	0.0	D
Vest4		0.28
MVP		0.71
GERP RS		2.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs549959474; hg19: chr16-75661883;