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We propose new predictions from Grand Unified Theories (GUTs) (applicable toboth supersymmetric (SUSY) and non-SUSY models) for the ratios of quark andlepton Yukawa couplings. These new predictions arise from splitting the massesof the messenger fields for the GUT scale Yukawa operators by Clebsch-Gordanfactors from GUT symmetry breaking. This has the effect that these factorsenter inversely in the predicted quark-lepton Yukawa coupling ratios, leadingto new possible GUT predictions. We systematically construct the newpredictions that can be realised in this way in SU(5) GUTs and Pati-Salamunified theories and discuss model building applications.

GUT predictions for quark-lepton Yukawa coupling ratios with messenger masses from non-singlets