  With the recent observation of nonzero \theta_{13}, five neutrino oscillation
parameters are now known. By imposing four zeros in the Yukawa coupling matrix
of the type I seesaw model, the number of parameters in the neutrino mass
matrix is reduced to seven, and we are able to make predictions for the
lightest neutrino mass, Dirac CP phase, and neutrinoless double beta decay.
Four texture zeros in the Yukawa coupling matrix is equivalent to either a
single texture zero or a single cofactor zero for an off-diagonal element of
the light neutrino mass matrix. We find strong similarities between single
texture zero models with one mass ordering and single cofactor zero models with
the opposite mass ordering. In the context of a specific class of single-flavor
leptogenesis models, we find additional constraints on the parameter space.
