  We propose new predictions from Grand Unified Theories (GUTs) (applicable to
both supersymmetric (SUSY) and non-SUSY models) for the ratios of quark and
lepton Yukawa couplings. These new predictions arise from splitting the masses
of the messenger fields for the GUT scale Yukawa operators by Clebsch-Gordan
factors from GUT symmetry breaking. This has the effect that these factors
enter inversely in the predicted quark-lepton Yukawa coupling ratios, leading
to new possible GUT predictions. We systematically construct the new
predictions that can be realised in this way in SU(5) GUTs and Pati-Salam
unified theories and discuss model building applications.
