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Gene action in fish of tetraploid origin. III. Ribosomal DNA amount in cyprinid fish

✍ Scribed by J. Schmidtke; W. Engel

Publisher
Springer
Year
1976
Tongue
English
Weight
330 KB
Volume
14
Category
Article
ISSN
0006-2928

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✦ Synopsis

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.

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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. The