WordNet (r) 3.0 (2006):

mutate
    v 1: undergo mutation; "cells mutate"

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "mutate":
   accommodate, adapt, adjust, alter, ameliorate, be changed,
   be converted into, be renewed, better, bottom out, break, break up,
   change, checker, chop, chop and change, come about, come around,
   come round, commute, convert, deform, degenerate, denature,
   deteriorate, deviate, diverge, diversify, fit, flop, haul around,
   improve, jibe, meliorate, metamorphose, mitigate, modify, modulate,
   overthrow, qualify, re-create, realign, rebuild, reconstruct,
   redesign, refashion, refit, reform, remake, renew, reshape,
   restructure, revamp, revive, ring the changes, shift,
   shift the scene, shuffle the cards, subvert, swerve, tack,
   take a turn, transfigure, transmogrify, transmute, transpose,
   transubstantiate, turn, turn aside, turn into, turn the corner,
   turn the scale, turn the tables, turn the tide, turn upside down,
   undergo a change, vary, veer, warp, work a change, worsen