  In this talk, we introduce a new scenario of grand unified theory (GUT) with
anomalous $U(1)_A$ gauge symmetry, which can explain doublet-triplet splitting,
quark and lepton masses and mixing angles. In neutrino sector, the scenario
realizes LMA solution for solar neutrino problem and large $U_{e3}=O(0.1)$.
Moreover, the scenario predicts that the main decay mode of proton is from
dimension 6 operators and the lifetime of proton must be near the present
limit. The realization of gauge coupling unification requires that the cutoff
scale of the scenario must be around the usual GUT scale $\Lambda_G\sim 2\times
10^{16}$ GeV, which is smaller than the Planck scale. It may suggest the extra
dimension in which gauge fields in visible sector do not propagate. This talk
is based on the papers. [maekawa,maekawa2,maekawa3,BM,MY]
