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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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  • 2
    Electronic Resource
    Electronic Resource
    Gene action in fish of tetraploid origin. III. Ribosomal DNA amount in cyprinid fish (1976)
    Springer
    Biochemical genetics 14 (1976), S. 19-26 
    Details
    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; ribosomal RNA genes ; cyprinid fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Phylogenetically diploid and tetraploid cyprinid fish species have cells of very similar volumes and protein contents. This finding has prompted us to postulate a regulatory system established during the evolution of the tetraploids leading to a diploid state of genic expression. It was proposed that this might be accounted for by a selective loss of ribosomal genes. RNA-DNA hybridization experiments, however, reveal a clear-cut 1:2 relationship of ribosomal DNA amounts between the diploid and the tetraploid species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484870
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  • 3
    Electronic Resource
    Electronic Resource
    Gene action in fish of tetraploid origin. V. Cellular RNA and protein content and enzyme activities in cyprinid, clupeoid, and salmonoid species (1976)
    Springer
    Biochemical genetics 14 (1976), S. 975-980 
    Details
    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; RNA content ; protein content ; enzyme activities ; Cyprinidae ; Isospondyli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The ratio of cellular RNA and protein content is about 1:1 between phylogenetically diploid and tetraploid species of the teleost family Cyprinidae, but is roughly in proportion to ploidy in species of the teleost order Isospondyli. Enzyme activities do not unequivocally comply with this scheme. These findings are discussed in view of the hypothesis that a regulatory mechanism which reduces genic activity has evolved in the tetraploid cyprinids but not in the tetraploid species of the order Isospondyli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00485129
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Gene action in fish of tetraploid origin. IV. Ribosomal DNA amount in clupeoid and salmonoid fish (1976)
    Springer
    Biochemical genetics 14 (1976), S. 293-297 
    Details
    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; ribosomal RNA genes ; Isospondyli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Phylogenetically tetraploid species of the fish order Isospondyli generally have twice the mean ribosomal gene content as closely related species on the phylogenetically diploid level. Considerable intraspecific variation of rDNA amount was observed. These findings are discussed in view of the hypothesis that selective loss of ribosomal genes may account for diminishing genic activity in phylogenetically tetraploid organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484768
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