19-10364753-G-A

Position:

• chr19-10364753-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_003331.5(TYK2):​c.1228C>T​(p.Arg410Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000137 in 1,461,574 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000014 (0 hom.)
• Consequence: TYK2 NM_003331.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.21

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TYK2	NM_003331.5	c.1228C>T	p.Arg410Trp	missense_variant	9/25	ENST00000525621.6	NP_003322.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TYK2	ENST00000525621.6	c.1228C>T	p.Arg410Trp	missense_variant	9/25	1	NM_003331.5	ENSP00000431885	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000160 AC: 4 AN: 250118 Hom.: 0 AF XY: 0.0000222 AC XY: 3 AN XY: 135422

Gnomad AFR exome AF: 0.0000619

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000654

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000887

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000137 AC: 20 AN: 1461574 Hom.: 0 Cov.: 32 AF XY: 0.0000138 AC XY: 10 AN XY: 727116

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000135

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000564 Hom.: 0

Bravo AF: 0.0000113

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 08, 2024

The c.1228C>T (p.R410W) alteration is located in exon 9 (coding exon 7) of the TYK2 gene. This alteration results from a C to T substitution at nucleotide position 1228, causing the arginine (R) at amino acid position 410 to be replaced by a tryptophan (W). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Immunodeficiency 35 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 12, 2022

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 410 of the TYK2 protein (p.Arg410Trp). This variant is present in population databases (rs780993314, gnomAD 0.007%). 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: 583103). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Not Available"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Not Available"). 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	Benign	0.11
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.35
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.16	T;T;T;.
Eigen	Uncertain	0.19
Eigen_PC	Benign	0.12
FATHMM_MKL	Benign	0.62	D
LIST_S2	Uncertain	0.89	D;D;.;D
M_CAP	Uncertain	0.091	D
MetaRNN	Uncertain	0.44	T;T;T;T
MetaSVM	Benign	-0.87	T
MutationAssessor	Uncertain	2.4	M;.;M;.
MutationTaster	Benign	0.98	N;N;N;N
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-2.3	N;N;N;N
REVEL	Benign	0.20
Sift	Benign	0.030	D;D;D;D
Sift4G	Benign	0.19	T;T;T;T
Polyphen		1.0	D;.;D;D
Vest4		0.38
MutPred		0.52		Loss of methylation at R410 (P = 0.0626);.;Loss of methylation at R410 (P = 0.0626);Loss of methylation at R410 (P = 0.0626);
MVP		0.70
MPC		0.64
ClinPred		0.80	D
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.22
gMVP		0.48

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: rs780993314; hg19: chr19-10475429;