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.
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This work was supported in part by the Smith-Kline-Dauelsberg Foundation. The results presented are part of the thesis work of M.L.
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Leipoldt, M., Engel, W. Hidden breaks in ribosomal RNA of phylogenetically tetraploid fish and their possible role in the diploidization process. Biochem Genet 21, 819–841 (1983). https://doi.org/10.1007/BF00498929
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DOI: https://doi.org/10.1007/BF00498929