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We present a common explanation of the fermion mass hierarchy and the largelepton mixing angles in the context of a grand unified flavor and gauge theory(GUTF). Our starting point is a SU(3)xU(1) flavor symmetry and a SO(10) GUT, abasic ingredient of our theory which plays a major role is that two differentbreaking pattern of the flavor symmetry are at work. On one side, the dynamicalbreaking of SU(3)xU(1) flavor symmetry into U(2)xZ_3 explains why one family ismuch heavier than the others. On the other side, an explicit symmetry breakingof SU(3) into a discrete flavor symmetry leads to the observed tribimaximalmixing for the leptons. We write an explicit model where this discrete symmetrygroup is A4. Naturalness of the charged fermion mass hierarchy appears as aconsequence of the continuous SU(3) flavor symmetry. Moreover, the samediscrete A4-GUT invariant operators are the root of the large lepton mixing,small Cabibbo angle, and neutrino masses.

Embedding A4 into SU(3)xU(1) flavor symmetry: Large neutrino mixing and fermion mass hierarchy in SO(10) GUT