Abstract:
:We sequenced eight melanoma exomes to identify new somatic mutations in metastatic melanoma. Focusing on the mitogen-activated protein (MAP) kinase kinase kinase (MAP3K) family, we found that 24% of melanoma cell lines have mutations in the protein-coding regions of either MAP3K5 or MAP3K9. Structural modeling predicted that mutations in the kinase domain may affect the activity and regulation of these protein kinases. The position of the mutations and the loss of heterozygosity of MAP3K5 and MAP3K9 in 85% and 67% of melanoma samples, respectively, together suggest that the mutations are likely to be inactivating. In in vitro kinase assays, MAP3K5 I780F and MAP3K9 W333* variants had reduced kinase activity. Overexpression of MAP3K5 or MAP3K9 mutants in HEK293T cells reduced the phosphorylation of downstream MAP kinases. Attenuation of MAP3K9 function in melanoma cells using siRNA led to increased cell viability after temozolomide treatment, suggesting that decreased MAP3K pathway activity can lead to chemoresistance in melanoma.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Stark MS,Woods SL,Gartside MG,Bonazzi VF,Dutton-Regester K,Aoude LG,Chow D,Sereduk C,Niemi NM,Tang N,Ellis JJ,Reid J,Zismann V,Tyagi S,Muzny D,Newsham I,Wu Y,Palmer JM,Pollak T,Youngkin D,Brooks BR,Lanagan C,Sdoi
10.1038/ng.1041subject
Has Abstractpub_date
2011-12-25 00:00:00pages
165-9issue
2eissn
1061-4036issn
1546-1718pii
ng.1041journal_volume
44pub_type
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