rs140594440

Variant names:

• chr19-10361922-C-T
• rs140594440
• NM_003331.5:c.1807G>A

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BS1_Supporting

The NM_003331.5(TYK2):​c.1807G>A​(p.Val603Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000198 in 1,614,110 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00019 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00020 (0 hom.)
• Consequence: TYK2 NM_003331.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 3.53

Genes affected

TYK2 (HGNC:12440): (tyrosine kinase 2) This gene encodes a member of the tyrosine kinase and, more specifically, the Janus kinases (JAKs) protein families. This protein associates with the cytoplasmic domain of type I and type II cytokine receptors and promulgate cytokine signals by phosphorylating receptor subunits. It is also a component of both the type I and type III interferon signaling pathways. As such, it may play a role in anti-viral immunity. A mutation in this gene has been associated with Immunodeficiency 35. [provided by RefSeq, Sep 2020]

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.21590436).
• BS1: Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.000199 (291/1461826) while in subpopulation MID AF= 0.00329 (19/5768). AF 95% confidence interval is 0.00216. There are 0 homozygotes in gnomad4_exome. There are 160 alleles in male gnomad4_exome subpopulation. Median coverage is 36. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TYK2	NM_003331.5	c.1807G>A	p.Val603Met	missense_variant	Exon 13 of 25	ENST00000525621.6	NP_003322.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TYK2	ENST00000525621.6	c.1807G>A	p.Val603Met	missense_variant	Exon 13 of 25	1	NM_003331.5	ENSP00000431885.1

Frequencies

GnomAD3 genomes AF: 0.000204 AC: 31 AN: 152166 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000724

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000589

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000578

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.000162

Gnomad OTH AF: 0.00144

GnomAD3 exomes AF: 0.000291 AC: 73 AN: 251102 Hom.: 0 AF XY: 0.000317 AC XY: 43 AN XY: 135802

Gnomad AFR exome AF: 0.0000617

Gnomad AMR exome AF: 0.000550

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000870

Gnomad SAS exome AF: 0.000196

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000203

Gnomad OTH exome AF: 0.00130

GnomAD4 exome AF: 0.000199 AC: 291 AN: 1461826 Hom.: 0 Cov.: 36 AF XY: 0.000220 AC XY: 160 AN XY: 727218

Gnomad4 AFR exome AF: 0.0000896

Gnomad4 AMR exome AF: 0.000514

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000730

Gnomad4 SAS exome AF: 0.000394

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000140

Gnomad4 OTH exome AF: 0.000447

GnomAD4 genome AF: 0.000190 AC: 29 AN: 152284 Hom.: 0 Cov.: 32 AF XY: 0.000242 AC XY: 18 AN XY: 74454

Gnomad4 AFR AF: 0.0000722

Gnomad4 AMR AF: 0.000588

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000579

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000162

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.000306 Hom.: 0

Bravo AF: 0.000332

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.000349 AC: 3

ExAC AF: 0.000280 AC: 34

Asia WGS AF: 0.000577 AC: 2 AN: 3478

EpiCase AF: 0.000273

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Immunodeficiency 35 Uncertain:3

Oct 28, 2018

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Nov 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 603 of the TYK2 protein (p.Val603Met). This variant is present in population databases (rs140594440, gnomAD 0.1%). This variant has not been reported in the literature in individuals affected with TYK2-related conditions. ClinVar contains an entry for this variant (Variation ID: 327946). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on TYK2 protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.25
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.59	D;T;D;.
Eigen	Uncertain	0.32
Eigen_PC	Benign	0.11
FATHMM_MKL	Benign	0.27	N
LIST_S2	Uncertain	0.96	D;D;.;D
M_CAP	Pathogenic	0.37	D
MetaRNN	Benign	0.22	T;T;T;T
MetaSVM	Uncertain	-0.035	T
MutationAssessor	Pathogenic	3.3	M;.;M;.
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-2.0	N;N;N;N
REVEL	Uncertain	0.38
Sift	Uncertain	0.0010	D;D;D;D
Sift4G	Uncertain	0.0050	D;D;D;D
Polyphen		1.0	D;.;D;D
Vest4		0.29
MVP		0.67
MPC		0.89
ClinPred		0.11	T
GERP RS		1.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.34
gMVP		0.71

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

LitVar

Other links and lift over

dbSNP: rs140594440; hg19: chr19-10472598; COSMIC: COSV53390834; COSMIC: COSV53390834;