In addition, mutations in PDGFRB, HIF1A, and MAP2K1 genes were identified in the nevus, and mutations in HDAC2, PRK2, ARID2, BRCA2, NOTCH3, NOTCH2, BRAF, CSF1R, and PTEN, among others, were found in the atypical nevus. The gene discussed is MAP2K1; the disease is nevus.