2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43973A simple extension of the minimal renormalizable supersymmetric SO(10) grand unified theory by adding a 120-dimensional Higgs representation is examined. This brings new antisymmetric contributions to the relevant quark and lepton mass sum rules and leads to a better fit of the measured values of lepton masses and mixings together with a natural completion of the renormalizable Higgs sector within the SUSY SO(10) framework.Talk given at the international conference "Particles, Strings and Cosmology 2004" (PASCOS'04) in Boston, August 16-22, 2004High Energy Physics - Phenomenologytext