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  • Animal model  (1)
  • Gene structure  (1)
  • Springer  (2)
  • 1
    ISSN: 1432-1211
    Keywords: Key words Complement ; Decay-accelerating factor ; Repetitive sequence ; Gene structure ; Serine/threonine-rich region
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  The decay-accelerating factor (DAF, CD55) protects cells from autologous complement attack on self cell membranes. We have previously reported that the seventh exon encoding the serine/threonine-rich(S/T)-abc region of the guinea pig DAF gene is composed of five homologous repeats of about 51 base pairs, and that differential usage of these repeats produces the various lengths observed in the S/T region of guinea pig DAF. In this study, we found that the seventh intron of the guinea pig DAF gene was wholly composed of 18 tandem repeats homologous to the repeating unit of the S/T-abc exon. This type of repetitive structure, although the number of repeats was variable, was also found in the corresponding exons and introns of all DAF genes of other species so far tested including human and seven other primates and mouse, in which alternative splicing in this region has not been found. This suggested that generation of the repetitive sequences spanning the exon and intron regions had occurred before the diversification of these species. In addition, all the intron sequences of the tested DAF genes had no stop codon when they were presumably translated in the same reading frame as the seventh and eighth exons, except for that of one of two duplicated mouse DAF genes. These findings and significant interspecies identities of the intron sequence suggest that the intron sequence conceivably could be translated in some tissues and/or in some stages of development although to date we have not yet succeeded in detecting mRNA for this region.
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  • 2
    ISSN: 1437-7799
    Keywords: Key words Adenine ; Animal model ; Chronic renal failure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background. A renal failure model prepared from rats fed on an adenine diet provides valuable information about the pathomechanism of various complications associated with a persistent uremic state. To establish an animal experimental model in which the animals survive in a persistent uremic state, it is essential to settle a point of no return, i.e., an irreversible point. We investigated an irreversible point using the rat renal failure model induced by adenine treatment. Methods. Rats were fed on a diet containing 0.75% adenine for 2, 4, or 6 weeks, and they were then fed an adenine-free diet for an additional 4 weeks to evaluate the degree of recovery from renal dysfunction. Results. The rats fed on the adenine diet for 2 weeks showed a decrease in mean serum creatinine(s-Cr) from 1.8 mg/dl before to 0.7 mg/dl after the observation period, with mild anemia. The rats fed on the adenine diet for 4 weeks showed persistent renal dysfunction. Although the mean s-Cr decreased from 2.7 to 2.0 mg/dl, it continued to be higher than the normal range, and the anemia worsened. In the rats fed on the adenine diet for 6 weeks, the mean s-Cr increased from 3.4 to 3.6 mg/dl. Hypoproteinemia was also observed and some animals died. Conclusion. Based on the above results, it was concluded that to prepare a model of chronic renal failure in rats compatible to chronic renal failure seen clinically, the administration of a 0.75% adenine diet for 4 weeks is most appropriate.
    Type of Medium: Electronic Resource
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