rs587778419

Positions:

• chr19-17842334-C-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_000215.4(JAK3):​c.843G>C​(p.Trp281Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000209 in 1,432,030 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: JAK3 NM_000215.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1 O:1
• Conservation: PhyloP100: 6.67

Genes affected

JAK3 (HGNC:6193): (Janus kinase 3) The protein encoded by this gene is a member of the Janus kinase (JAK) family of tyrosine kinases involved in cytokine receptor-mediated intracellular signal transduction. It is predominantly expressed in immune cells and transduces a signal in response to its activation via tyrosine phosphorylation by interleukin receptors. Mutations in this gene are associated with autosomal SCID (severe combined immunodeficiency disease). [provided by RefSeq, Jul 2008]

JAK3 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.965

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
JAK3	NM_000215.4	c.843G>C	p.Trp281Cys	missense_variant	6/24	ENST00000458235.7	NP_000206.2
JAK3	XM_047438786.1	c.843G>C	p.Trp281Cys	missense_variant	6/24		XP_047294742.1
JAK3	XM_011527991.3	c.843G>C	p.Trp281Cys	missense_variant	6/14		XP_011526293.2
JAK3	XR_007066796.1	n.893G>C		non_coding_transcript_exon_variant	6/20

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
JAK3	ENST00000458235.7	c.843G>C	p.Trp281Cys	missense_variant	6/24	5	NM_000215.4	ENSP00000391676.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000209 AC: 3 AN: 1432030 Hom.: 0 Cov.: 38 AF XY: 0.00000281 AC XY: 2 AN XY: 711460

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000230

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000181

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000936 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

T-B+ severe combined immunodeficiency due to JAK3 deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 27, 2021

This sequence change replaces tryptophan with cysteine at codon 281 of the JAK3 protein (p.Trp281Cys). The tryptophan residue is moderately conserved and there is a large physicochemical difference between tryptophan and cysteine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with JAK3-related conditions. ClinVar contains an entry for this variant (Variation ID: 134582). 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: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C15"). 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. -

not specified Other:1

not provided, no classification provided

reference population

ITMI

Sep 19, 2013

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Uncertain	24
DANN	Benign	0.92
DEOGEN2	Uncertain	0.67	D;D;.
Eigen	Benign	0.10
Eigen_PC	Benign	0.087
FATHMM_MKL	Benign	0.73	D
LIST_S2	Benign	0.58	T;.;T
M_CAP	Pathogenic	0.70	D
MetaRNN	Pathogenic	0.97	D;D;D
MetaSVM	Benign	-0.52	T
MutationAssessor	Uncertain	2.5	M;M;M
PrimateAI	Uncertain	0.76	T
PROVEAN	Pathogenic	-8.3	D;D;D
REVEL	Uncertain	0.39
Sift	Uncertain	0.019	D;D;D
Sift4G	Benign	0.063	T;T;T
Polyphen		0.90	P;P;B
Vest4		0.68
MutPred		0.75		Loss of sheet (P = 0.1907);Loss of sheet (P = 0.1907);Loss of sheet (P = 0.1907);
MVP		0.76
MPC		1.7
ClinPred		1.0	D
GERP RS		4.3
Varity_R		0.48
gMVP		0.90

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: rs587778419; hg19: chr19-17953143;