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| Gene | JAK2 |
| Variant | E818* |
| Impact List | nonsense |
| Protein Effect | loss of function - predicted |
| Gene Variant Descriptions | JAK2 E818* results in a premature truncation of the Jak2 protein at amino acid 818 of 1132 (UniProt.org). Due to the loss of protein kinase domain 2 (UniProt.org), E818* is predicted to lead to a loss of Jak2 protein function. |
| Associated Drug Resistance | |
| Category Variants Paths |
JAK2 mutant JAK2 inact mut JAK2 E818* |
| Transcript | NM_004972.4 |
| gDNA | chr9:g.5081742G>T |
| cDNA | c.2452G>T |
| Protein | p.E818* |
| Source Database | RefSeq |
| Genome Build | GRCh38/hg38 |
| Transcript | gDNA | cDNA | Protein | Source Database | Genome Build |
|---|---|---|---|---|---|
| NM_004972 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_001322194.1 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_004972.4 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_001322195.2 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_001322194.2 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_001322195.1 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_001322196.1 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_004972.3 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_001322195 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_001322196.2 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_001322194 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| NM_001322196 | chr9:g.5081742G>T | c.2452G>T | p.E818* | RefSeq | GRCh38/hg38 |
| 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 | 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 | 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 | essential thrombocythemia | not applicable | N/A | Guideline | Diagnostic | JAK2 mutations aid in the diagnosis of essential thrombocythemia (NCCN.org). | detail... |