  We present a determination, from lattice QCD, of charge symmetry violation in
the spin- independent and spin-dependent parton distribution functions of the
nucleon. This is done by chirally extrapolating recent QCDSF/UKQCD
Collaboration lattice simulations of the first several Mellin moments of the
parton distribution functions of octet baryons to the physical point. We find
small chiral corrections for the polarized moments, while the corrections are
quantitatively significant in the unpolarized case.
