rs1327494

Variant names:

• chr9-4999303-A-G
• rs1327494
• NM_004972.4:c.-26+13281A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_004972.4(JAK2):​c.-26+13281A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.248 in 152,170 control chromosomes in the GnomAD database, including 4,948 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.25 (4948 hom., cov: 32)
• Consequence: JAK2 NM_004972.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.259
• Publications: 12 publications found

Genes affected

JAK2 (HGNC:6192): (Janus kinase 2) This gene encodes a non-receptor tyrosine kinase that plays a central role in cytokine and growth factor signalling. The primary isoform of this protein has an N-terminal FERM domain that is required for erythropoietin receptor association, an SH2 domain that binds STAT transcription factors, a pseudokinase domain and a C-terminal tyrosine kinase domain. Cytokine binding induces autophosphorylation and activation of this kinase. This kinase then recruits and phosphorylates signal transducer and activator of transcription (STAT) proteins. Growth factors like TGF-beta 1 also induce phosphorylation and activation of this kinase and translocation of downstream STAT proteins to the nucleus where they influence gene transcription. Mutations in this gene are associated with numerous inflammatory diseases and malignancies. This gene is a downstream target of the pleiotropic cytokine IL6 that is produced by B cells, T cells, dendritic cells and macrophages to produce an immune response or inflammation. Disregulation of the IL6/JAK2/STAT3 signalling pathways produces increased cellular proliferation and myeloproliferative neoplasms of hematopoietic stem cells. A nonsynonymous mutation in the pseudokinase domain of this gene disrupts the domains inhibitory effect and results in constitutive tyrosine phosphorylation activity and hypersensitivity to cytokine signalling. This gene and the IL6/JAK2/STAT3 signalling pathway is a therapeutic target for the treatment of excessive inflammatory responses to viral infections. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Jul 2020]

INSL6 (HGNC:6089): (insulin like 6) The protein encoded by this gene contains a classical signature of the insulin superfamily and is significantly similar to relaxin and relaxin-like factor. This gene is preferentially expressed in testis. Its expression in testis is restricted to interstitial cells surrounding seminiferous tubules, which suggests a role in sperm development and fertilization. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.58).
• BA1: GnomAd4 highest subpopulation (SAS) allele frequency at 95% confidence interval = 0.303 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
JAK2	NM_004972.4	c.-26+13281A>G		intron_variant	Intron 2 of 24	ENST00000381652.4	NP_004963.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
JAK2	ENST00000381652.4	c.-26+13281A>G		intron_variant	Intron 2 of 24	1	NM_004972.4	ENSP00000371067.4
JAK2	ENST00000636127.1	c.-26+13281A>G		intron_variant	Intron 2 of 15	5		ENSP00000489812.1
JAK2	ENST00000476574.5	c.-26+13281A>G		intron_variant	Intron 2 of 2	3		ENSP00000490624.1

Frequencies

GnomAD3 genomes AF: 0.248 AC: 37739 AN: 152050 Hom.: 4947 Cov.: 32

Gnomad AFR AF: 0.174

Gnomad AMI AF: 0.278

Gnomad AMR AF: 0.283

Gnomad ASJ AF: 0.257

Gnomad EAS AF: 0.252

Gnomad SAS AF: 0.315

Gnomad FIN AF: 0.326

Gnomad MID AF: 0.215

Gnomad NFE AF: 0.267

Gnomad OTH AF: 0.256

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.248 AC: 37758 AN: 152170 Hom.: 4948 Cov.: 32 AF XY: 0.253 AC XY: 18810 AN XY: 74370

African (AFR) AF: 0.174 AC: 7248 AN: 41536

American (AMR) AF: 0.282 AC: 4319 AN: 15290

Ashkenazi Jewish (ASJ) AF: 0.257 AC: 891 AN: 3470

East Asian (EAS) AF: 0.252 AC: 1303 AN: 5180

South Asian (SAS) AF: 0.316 AC: 1522 AN: 4820

European-Finnish (FIN) AF: 0.326 AC: 3445 AN: 10564

Middle Eastern (MID) AF: 0.194 AC: 57 AN: 294

European-Non Finnish (NFE) AF: 0.267 AC: 18184 AN: 67996

Other (OTH) AF: 0.254 AC: 537 AN: 2112

Alfa AF: 0.263 Hom.: 708

Bravo AF: 0.238

Asia WGS AF: 0.274 AC: 950 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.58
CADD	Benign	11
DANN	Benign	0.95
PhyloP100		0.26
Mutation Taster		=100/0	polymorphism (auto)

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: rs1327494; hg19: chr9-4999303;