1-64835404-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PP2 PP3_Moderate

The NM_002227.4(JAK1):c.3361C>T(p.Pro1121Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000561 in 1,426,286 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P1121A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000056 (0 hom.)
• Consequence: JAK1 NM_002227.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.67

Genes affected

JAK1 (HGNC:6190): (Janus kinase 1) This gene encodes a membrane protein that is a member of a class of protein-tyrosine kinases (PTK) characterized by the presence of a second phosphotransferase-related domain immediately N-terminal to the PTK domain. The encoded kinase phosphorylates STAT proteins (signal transducers and activators of transcription) and plays a key role in interferon-alpha/beta, interferon-gamma, and cytokine signal transduction. This gene plays a crucial role in effecting the expression of genes that mediate inflammation, epithelial remodeling, and metastatic cancer progression. This gene is a key component of the interleukin-6 (IL-6)/JAK1/STAT3 immune and inflammation response and is a therapeutic target for alleviating cytokine storms. The kinase activity of this gene is directly inhibited by the suppressor of cytokine signalling 1 (SOCS1) protein. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2020]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PP2: Missense variant where missense usually causes diseases, JAK1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.903

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
JAK1	NM_002227.4	c.3361C>T	p.Pro1121Ser	missense_variant	24/25	ENST00000342505.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
JAK1	ENST00000342505.5	c.3361C>T	p.Pro1121Ser	missense_variant	24/25	5	NM_002227.4	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000430 AC: 1 AN: 232686 Hom.: 0 AF XY: 0.00000788 AC XY: 1 AN XY: 126950

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000917

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000561 AC: 8 AN: 1426286 Hom.: 0 Cov.: 27 AF XY: 0.00000422 AC XY: 3 AN XY: 711228

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000733

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 03, 2022

This variant has not been reported in the literature in individuals affected with JAK1-related conditions. 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. 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) performed at Invitae indicates that this missense variant is not expected to disrupt JAK1 protein function. This variant is present in population databases (no rsID available, gnomAD 0.0009%). This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 1121 of the JAK1 protein (p.Pro1121Ser). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.30
BayesDel_addAF	Uncertain	0.061	T
BayesDel_noAF	Benign	-0.15
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.82	D
Eigen	Uncertain	0.23
Eigen_PC	Benign	0.22
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.87	D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Uncertain	-0.030	T
MutationAssessor	Benign	0.72	N
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.48	T
PROVEAN	Pathogenic	-6.2	D
REVEL	Uncertain	0.54
Sift	Benign	0.057	T
Sift4G	Uncertain	0.060	T
Polyphen		0.89	P
Vest4		0.43
MutPred		0.84		Loss of glycosylation at P1121 (P = 0.077);
MVP		0.69
MPC		1.7
ClinPred		0.90	D
GERP RS		3.3
Varity_R		0.46
gMVP		0.52

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: rs1413899535; hg19: chr1-65301087;