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J. Biol. Chem., Vol. 266, Issue 10, 6201-6208, 04, 1991

The distribution of cerebral expression of the transferrin gene is species specific

GF Tu, MG Achen, AR Aldred, BR Southwell and G Schreiber
Russell Grimwade School of Biochemistry, University of Melbourne, Parkville, Victoria, Australia.

Various plasma proteins, for example, transferrin, are synthesized not only in the liver, but also in the brain. The proportion of transferrin mRNA in total RNA from different regions of brains from various mammalian species was studied by Northern blot analysis. Absolute amounts of transferrin mRNA were determined in brain, choroid plexus, and liver from rats, sheep, and pigs by hybridization in solution followed by ribonuclease protection assay. Corrections for differences in yields of RNA were made using internal RNA standards. Large proportions of transferrin mRNA in total RNA and high absolute levels of transferrin mRNA in choroid plexus were found only in rats. Small proportions of transferrin mRNA were observed in RNA from choroid plexus from mice, dogs, and rabbits, while no transferrin mRNA at all was detected in choroid plexus from humans, sheep, pigs, cows, and guinea pigs. In further analysis of sheep and pigs, various amounts of transferrin mRNA were found in many parts of the brain, in contrast to the absence of transferrin mRNA from choroid plexus. In conclusion, a striking species specificity was observed for the pattern of cerebral expression of the transferrin gene.
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