Fmr1^tm1Rbd

PCR mutagenesis was used to create an I304N mutation in exon 10, changing sequence CTG(Leu) ATT(Ile) CAA(Gln) to CTT(Leu) AAC(Asn) CAG(Gln). A loxP-Auto-Cre-NeoR-loxP (ACNF) cassette was inserted in intron 10. Northern blot and quantitative RT-PCR analysis showed that the mutant mRNA was expressed at wild type level and was of the expected size in both brain and testes, but Western blot showed that protein levels were decreased to 13-30% that of wild type. Sequencing of RT-PCR products confirmed the presence of the mutation. (J:155593)