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  • 1
    Electronic Resource
    Electronic Resource
    Gene action in fish of tetraploid origin. I. Cellular and biochemical parameters in cyprinid fish (1975)
    Springer
    Biochemical genetics 13 (1975), S. 45-51 
    Details
    ISSN: 1573-4927
    Keywords: gene action ; polyploidy ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In phylogenetically diploid and tetraploid Cyprinid fish species, erythrocyte volumes, protein contents, and mean activities of the enzymes LDH, 6PGD, and PGI per cell per active gene locus decline with increasing DNA contents. These findings are assumed to reflect an evolutionary tendency of polyploids to regulate their genic activity down to the level of the diploids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486005
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hidden breaks in ribosomal RNA of phylogenetically tetraploid fish and their possible role in the diploidization process (1983)
    Springer
    Biochemical genetics 21 (1983), S. 819-841 
    Details
    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; ribosomal RNA ; protein synthesis ; gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Hidden breaks occur in the ribosomal RNA of tetraploid Cyprinid fish such that the large ribosomal RNA (28 S) yields upon denaturation two RNA fragments of 8.7×105 and 5.0×105 daltons, whereas the small rRNA (18 S) yields fragments of 3.2×105 to 5.0×104 daltons. In tetraploid Cyprinids hidden breaks occur only in the rRNA of somatic tissue and not in oocytes and sperm cells. Hidden breaks can be detected only slightly in diploid Cyprinid species. Ribosomes purified from somatic tissue of tetraploid Cyprinids show a reduced efficiency in protein synthesis in vitro. The ribosomal proteins from diploid and tetraploid Cyprinid fish show considerable electrophoretic differences. This is discussed in light of a possible functional role of hidden breaks in rRNA in the process of diploidization of gene expression in tetraploid Cyprinid species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00498929
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    Paper (German National Licenses)
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