  A class of predictive SO(10) grand unified theories with highly asymmetric
mass matrices, known as lopsided textures, has been developed to accommodate
the observed mixing in the neutrino sector. The model class effectively
determines the rate for charged lepton flavour violation, and in particular the
branching ratio for $\mu -> e \gamma$, assuming that the supersymmetric GUT
breaks directly to the constrained minimal supersymmetric standard model
(CMSSM). We find that in light of the combined constraints on the CMSSM
parameters from direct searches and from the WMAP satellite observations, the
resulting predicted rate for $\mu -> e \gamma$ in this model class can be
within the current experimental bounds for low $\tan \beta$, but that the next
generation of $\mu -> e \gamma$ experiments would effectively rule out this
model class if LFV is not detected.
