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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cloning, sequencing and tissue distribution of rat flavin-containing monooxygenase 4: two different forms are produced by tissue-specific alternative splicing.

The nucleotide sequence of rat flavin-containing monooxygenase 4 ( FMO4) mRNA was obtained by reverse transcription-polymerase chain reaction (RT-PCR) and 5'/3' terminal extension. Complete cDNA was amplified, cloned, and sequenced from the mRNA obtained from rat kidney and brain. Two different transcripts (short and long) stemming from the splicing of an internal region of 189 bases pair, corresponding to exon 4 were identified. This alternative splicing seems to be specific of the brain. The long cDNA encodes a protein of 560 amino acids with a predicted molecular mass of 63,395 Da. The short cDNA encodes a protein of 497 amino acids with a predicted molecular mass of 55,871 Da. Both of these encoded sequences contain the NADPH- and FAD-binding sites and a hydrophilic carboxyl terminus. These sequences are 80 and 79% identical to the sequences of human and rabbit FMO4. By Northern blotting and/or RT-PCR, the long-form FMO4 mRNA was detected in the rat kidney, intestine, and liver and the short form particularly in the brain. For the first time, the expression of FMO4 protein was demonstrated. By Western blotting using the two different forms of FMO4 antibodies, a long FMO4 protein was detected in the rat kidney, whereas in the rat brain, only the short form of FMO4 was observed.[1]


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