Mutation analysis detected point mutations in 7 (33%) cases, including KRAS (n=4) and MAP2K1 (n=3). Eight patients with mutations in MAP2K1 in affected bone were compared to the seven MAP2K1‐negative patients to identify distinguishing characteristics. In samples of affected bone from 8 patients with isolated melorheostosis (MEL; 155950), Kang et al. References Rodriguez-Viciana, P, et al. (2018) identified somatic mosaicism for missense mutations in the MAP2K1 gene (Q56P, 176872.0006; K57N, 176872.0007; and K57E, 176872.0008) that were not present in unaffected bone or in peripheral blood leukocytes.Mutant allele frequency ranged from 3 to 34% in affected bone. Germline mutations in genes within the MAPK pathway cause cardio-facio-cutaneous syndrome. No mutations were identified in ARAF, BRAF, PIK3CA, or any other genes assessed.

Figure 1: Part of the growth pathway in a healthy cell. Cancer cells with mutations in MAP2K1 also tend to have mutations in the BRAF or NRAS gene. Immunohistochemistry demonstrated p-ERK overexpression in 3 cases, all harboring MAP2K1 mutations. MAP2K1 gene is very similar to MAP2K2 and their functions are crucial for normal development before birth and survival after birth. These MAP2K1 mutations in LCH are predominantly in-frame deletions (corresponding to either class 2 or class 3 MAP2K1 mutations), with a minor component of point mutations … But these mutations can occur in all types of melanoma. In our experiments, a total of six (3.5%) activating mutations in MAP2K1 were thus identified among 172 of specimens or cell lines for human epithelial tumors.

The effects of MAP2K1 mutations on EC function and AVM formation, however, are unknown. Gene Symbol: MAP2K1: Synonyms: CFC3 | MAPKK1 | MEK1 | MEL | MKK1 | PRKMK1: Gene Description: MAP2K1 (MEK1), mitogen-activated protein kinase kinase 1, is a serine-threonine kinase, which activates that RAS-RAF-MEK-ERK pathway in cell proliferation and differentiation (PMID: 22753777).MAP2K1 (MEK1) activating mutations have been identified in a number of solid tumor …

We assessed 50 cases of LCH for BRAF mutations and assessed a subset of cases for MAP2K1 mutations. Mutations in MAP2K1 have been identified in lung cancer, colon cancer and melanoma of the skin. The study group included 28 men and 22 women (median age, 36.5 years; range, 1-78 years). Although mutations in the negative regulatory domain in MAP2K1 have been found in a variety of tumors, when present in the germline in cardio‐facio‐cutaneous syndrome, these mutations do not appear to pose the same malignancy risk as found in other RASopathies like neurofibromatosis type 1 (NF1). Given the addiction of cancer cells to the elevated MAP2K1 activity for proliferation, human cancers with such MAP2K1 mutations are suitable targets for the treatment with MAP2K1 inhibitors.

MAP2K1 mutations are most common in melanomas found on skin damaged by the sun. MAP2K1 is very similar to the gene MAP2K2 (endoding the protein MEK2 protein kinase), which is also part of the same pathway. The head and neck region was the most common area involved (n=7). BRAF mutations, usually V600E, have been reported in 40%-70% of cases, and recently, MAP2K1 mutations have been reported in BRAF-negative cases. MAP2K1 gene that changes the MAP2K1 protein . All are autosomal dominant disorders typically caused by gain-of-function mutations in genes encoding signaling molecules of the RAS/MAPK pathway (PTPN11, RAF1, SOS1, KRAS, BRAF, MAP2K1, MAP2K2, HRAS, NRAS, CBL, SHOC2). 26395 Ensembl ENSG00000169032 ENSMUSG00000004936 UniProt Q02750 P31938 RefSeq (mRNA) NM_002755 NM_008927 RefSeq (protein) NP_002746 NP_032953 Location (UCSC) Chr 15: 66.39 – 66.49 Mb Chr 9: 64.19 – 64.25 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Dual specificity mitogen-activated protein kinase kinase 1 is an enzyme that in humans is encoded by the MAP2K1 gene… MAP2K1 mutations in non-ECs may cause neoplasms (melanoma, lung, hematopoietic) and can increase MEK1 activity [, , , , , , , , , ]. Both the MEK1 and the MEK2 protein kinases seem to be essential for normal development and survival before and after birth.

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