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Gene JAK2
Variant K882R
Impact List missense
Protein Effect loss of function
Gene Variant Descriptions JAK2 K882R lies within the protein kinase domain 2 of the Jak2 protein (UniProt.org). K882R demonstrates increased protein stability, and loss of kinase activity, Epo-induced activation of Jak2, and reduced cytokine-induced colony formation compared to wild-type Jak2 in culture (PMID: 17024180, PMID: 18160720).
Associated Drug Resistance
Category Variants Paths

JAK2 mutant JAK2 inact mut JAK2 K882R

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Transcript NM_004972.4
gDNA chr9:g.5089747A>G
cDNA c.2645A>G
Protein p.K882R
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_001322195 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_004972 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_001322196.2 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_001322195.2 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_001322194 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_004972.3 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_001322194.2 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_001322196.1 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_001322196 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_001322194.1 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_001322195.1 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38
NM_004972.4 chr9:g.5089747A>G c.2645A>G p.K882R RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
JAK2 inact mut melanoma predicted - resistant Pembrolizumab Case Reports/Case Series Actionable In a clinical study, a melanoma patient treated with Keytruda (pembrolizumab) initially demonstrated a partial response, however, post 734 days developed disease progression due to a splice site mutation in JAK2, which resulted in an intron inclusion and an early stop codon, leading to a loss of protein expression (PMID: 27433843). 27433843
JAK2 mutant myelofibrosis not applicable N/A Guideline Diagnostic JAK2 mutations aid in the diagnosis of primary myelofibrosis (NCCN.org). detail...
JAK2 mutant childhood B-cell acute lymphoblastic leukemia not applicable N/A Guideline Prognostic JAK2 mutations are associated with a poor prognosis in pediatric patients with B-cell acute lymphoblastic leukemia (NCCN.org). detail...
JAK2 mutant B-cell acute lymphoblastic leukemia not applicable N/A Guideline Prognostic JAK2 mutations are associated with a poor prognosis in patients with B-cell acute lymphoblastic leukemia (NCCN.org). detail...
JAK2 mutant essential thrombocythemia not applicable N/A Guideline Diagnostic JAK2 mutations aid in the diagnosis of essential thrombocythemia (NCCN.org). detail...