Introns 10 and 11 of Lmna were deleted thereby abolishing production of lamin C and producing only prelamin A. The lamin C 3' UTR replaced the endogenous prelamin A 3' UTR and a floxed neomycin resistance cassette was inserted downstream of the modified 3' UTR. Western blot analysis confirmed the increased expression of lamin A protein in cerebral cortex and the cerebellum. (J:207144)