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Gene MAP2K1
Variant P387S
Impact List missense
Protein Effect gain of function
Gene Variant Descriptions MAP2K1 P387S does not lie within any known functional domains of the Map2k1 protein (UniProt.org). P387S confers a gain of function to the Map2k1 protein as demonstrated by constitutive phosphorylation of Mek and Erk (PMID: 22389471).
Associated Drug Resistance
Category Variants Paths

MAP2K1 mutant MAP2K1 act mut MAP2K1 P387S

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Transcript NM_002755.4
gDNA chr15:g.66490592C>T
cDNA c.1159C>T
Protein p.P387S
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_002755.3 chr15:g.66490592C>T c.1159C>T p.P387S RefSeq GRCh38/hg38
NM_002755 chr15:g.66490592C>T c.1159C>T p.P387S RefSeq GRCh38/hg38
NM_002755.4 chr15:g.66490592C>T c.1159C>T p.P387S RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
BRAF V600E MAP2K1 P387S NRAS A146T melanoma resistant Dabrafenib Preclinical Actionable In a preclinical study, human melanoma cell lines harboring BRAF V600E, NRAS A146T and MAP2K1 P387S were resistant to Tafinlar (dabrafenib) mediated growth inhibition in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS A146T melanoma resistant Vemurafenib Preclinical Actionable In a preclinical study, melanoma cell lines harboring BRAF V600E, NRAS A146T and MAP2K1 P387S were resistant to Zelboraf (vemurafenib) growth inhibition in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS A146T melanoma decreased response Trametinib Preclinical Actionable In a preclinical study, melanoma cell lines harboring BRAF V600E, NRAS A146T and MAP2K1 P387S were >20-fold less sensitive to growth inhibition by Mekinist (trametinib) than parental cell lines harboring BRAF V600E and also had reduced sensitivity in comparison to cell lines harboring BRAF V600E and NRAS A146T in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS A146T melanoma decreased response GSK2126458 Preclinical Actionable In a preclinical study, melanoma cell lines harboring BRAF V600E, NRAS A146T and MAP2K1 P387S had reduced sensitivity to Omipalisib (GSK2126458) in comparison to parental cell lines harboring BRAF V600E in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS A146T melanoma no benefit Dabrafenib + GSK2126458 Preclinical Actionable In a preclinical study, Talfinlar (dabrafenib) in combination with Omipalisib (GSK2126458) did not improve the response to human melanoma cell lines harboring BRAF V600E, NRAS A146T and MAP2K1 P387S in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS A146T melanoma sensitive GSK2126458 + Trametinib Preclinical Actionable In a preclinical study, Mekinist (trametinib) in combination with Omipalisib (GSK2126458) resulted in improved growth inhibition in melanoma cell lines harboring BRAF V600E, NRAS A146T and MAP2K1 P387S in culture, compared to either agent alone (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K melanoma resistant Dabrafenib Preclinical Actionable In a preclinical study, human melanoma cell lines harboring BRAF V600E, NRAS Q61K and MAP2K1 P387S were resistant to Tafinlar (dabrafenib) mediated growth inhibition in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K melanoma resistant Vemurafenib Preclinical Actionable In a preclinical study, human melanoma cell lines harboring BRAF V600E, NRAS Q61K and MAP2K1 P387S were resistant to growth inhibition by Zelboraf (vemurafenib) in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K melanoma decreased response Trametinib Preclinical Actionable In a preclinical study, human melanoma cell lines harboring BRAF V600E, NRAS Q61K and MAP2K1 P387S were >20-fold less sensitive to growth inhibition by Mekinist (trametinib) than parental cell lines harboring BRAF V600E in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K melanoma decreased response GSK2126458 Preclinical Actionable In a preclinical study, human melanoma cell lines harboring BRAF V600E, NRAS Q61K and MAP2K1 P387S had reduced sensitivity to Omipalisib (GSK2126458) in comparison to parental cell lines harboring BRAF V600E in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K melanoma conflicting Dabrafenib + GSK2126458 Preclinical Actionable In a preclinical study, the response of human melanoma cell lines harboring BRAF V600E, NRAS Q61K, and MAP2K1 P387S to Tafinlar (dabrafenib) in combination with Omipalisib (GSK2126458) was conflicting as one cell line with this mutation profile responded to the combination and another cell line with the mutation profile did not (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K melanoma sensitive GSK2126458 + Trametinib Preclinical Actionable In a preclinical study, Mekinist (trametinib) in combination with Omipalisib (GSK2126458) resulted in improved growth inhibition of human melanoma cell lines harboring BRAF V600E, NRAS Q61K, and MAP2K1 P387S in culture, compared to either agent alone (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K NRAS A146T melanoma resistant Dabrafenib Preclinical Actionable In a preclinical study, melanoma cell lines harboring BRAF V600E, NRAS Q61K, NRAS A146T and MAP2K1 P387S were resistant Tafinlar (dabrafenib) mediated growth inhibition in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K NRAS A146T melanoma resistant Vemurafenib Preclinical Actionable In a preclinical study, melanoma cell lines harboring BRAF V600E, NRAS Q61K, A146T and MAP2K1 P387S were resistant to Zelboraf (vemurafenib) growth inhibition in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K NRAS A146T melanoma resistant Trametinib Preclinical Actionable In a preclinical study, melanoma cell lines harboring BRAF V600E, NRAS Q61K, NRAS A146T and MAP2K1 P387S were resistant to growth inhibition by Mekinist (trametinib) in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K NRAS A146T melanoma decreased response GSK2126458 Preclinical Actionable In a preclinical study, melanoma cell lines harboring BRAF V600E, NRAS Q61K, NRAS A146T and MAP2K1 P387S had reduced sensitivity to Omipalisib (GSK2126458) in comparison to parental cell lines harboring BRAF V600E in culture (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S NRAS Q61K NRAS A146T melanoma sensitive GSK2126458 + Trametinib Preclinical Actionable In a preclinical study, Mekinist (trametinib) in combination with Omipalisib (GSK2126458) resulted in improved growth inhibition in melanoma cell lines harboring BRAF V600E, NRAS Q61K, NRAS A146T and MAP2K1 P387S in culture, compared to either agent alone (PMID: 22389471). 22389471
BRAF V600E MAP2K1 P387S melanoma sensitive Cobimetinib Preclinical - Cell culture Actionable In a preclinical study, Cotellic (cobimetinib) inhibited viability of a melanoma cell line harboring BRAF V600E and expressing MAP2K1 P387S in culture (PMID: 36442478). 36442478
BRAF V600E MAP2K1 P387S melanoma sensitive Trametinib Preclinical - Cell culture Actionable In a preclinical study, Mekinist (trametinib) inhibited viability of a melanoma cell line harboring BRAF V600E and expressing MAP2K1 P387S in culture (PMID: 36442478). 36442478
BRAF V600E MAP2K1 P387S melanoma sensitive Binimetinib Preclinical - Cell culture Actionable In a preclinical study, Mektovi (binimetinib) inhibited viability of a melanoma cell line harboring BRAF V600E and expressing MAP2K1 P387S in culture (PMID: 36442478). 36442478
BRAF V600E MAP2K1 P387S melanoma sensitive Dabrafenib Preclinical - Cell culture Actionable In a preclinical study, Tafinlar (dabrafenib) inhibited viability of a melanoma cell line harboring BRAF V600E and expressing MAP2K1 P387S in culture (PMID: 36442478). 36442478
BRAF V600E MAP2K1 P387S melanoma sensitive Encorafenib Preclinical - Cell culture Actionable In a preclinical study, Braftovi (encorafenib) inhibited viability of a melanoma cell line harboring BRAF V600E and expressing MAP2K1 P387S in culture (PMID: 36442478). 36442478