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Gene MAP2K1
Variant C121S
Impact List missense
Protein Effect gain of function
Gene Variant Descriptions MAP2K1 C121S lies within the protein kinase domain of the Map2k1 protein (UniProt.org). C121S confers a gain of function on the Map2k1 protein as demonstrated by increased Erk1/2 (PMID: 25899310) and Mek phosphorylation in culture and confers acquired resistance to Raf and Mek inhibitors (PMID: 21383288, PMID: 24448821, PMID: 29483135, PMID: 29753091).
Associated Drug Resistance Y
Category Variants Paths

MAP2K1 mutant MAP2K1 act mut MAP2K1 C121S

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Transcript NM_002755.4
gDNA chr15:g.66436815T>A
cDNA c.361T>A
Protein p.C121S
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
XM_017022411.2 chr15:g.66436815T>A c.361T>A p.C121S RefSeq GRCh38/hg38
XM_017022411.3 chr15:g.66436815T>A c.361T>A p.C121S RefSeq GRCh38/hg38
NM_002755 chr15:g.66436815T>A c.361T>A p.C121S RefSeq GRCh38/hg38
NM_002755.4 chr15:g.66436815T>A c.361T>A p.C121S RefSeq GRCh38/hg38
NM_002755.3 chr15:g.66436815T>A c.361T>A p.C121S RefSeq GRCh38/hg38
XM_017022411 chr15:g.66436815T>A c.361T>A p.C121S RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
MAP2K1 C121S Advanced Solid Tumor sensitive Trametinib Preclinical - Cell culture Actionable In a preclinical study, Mekinist (trametinib) inhibited viability of a transformed cell line expressing MAP2K1 C121S in culture (PMID: 36442478). 36442478
MAP2K1 C121S Advanced Solid Tumor resistant AZD8330 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed resistance to the Mek inhibitor, AZD8330, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S colorectal cancer resistant Cetuximab Preclinical - Cell culture Actionable In a preclinical study, expression of MAP2K1 C121S conferred resistance to Erbitux (cetuximab) in colorectal cancer cells in culture (PMID: 28179366). 28179366
MAP2K1 C121S Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed resistance to Stivarga (regorafenib; BAY 73-4506), as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor sensitive Selumetinib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed sensitivity to the Mek inhibitor, Selumetinib (AZD6244), as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor sensitive PLX4720 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed sensitivity to the Braf inhibitor, PLX4720, as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor resistant GDC0879 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed resistance to the Braf inhibitor, GDC-0879, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor resistant PD98059 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed resistance to the Mek inhibitor, PD98059, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S colorectal cancer sensitive Cetuximab + Trametinib Preclinical - Cell culture Actionable In a preclinical study, the combination of Erbitux (cetuximab) and Mekinist (trametinib) decreased viability of colorectal cancer cells harboring MAP2K1 C121S in culture (PMID: 28179366). 28179366