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Gene action in fish of tetraploid origin. I. Cellular and biochemical parameters in cyprinid fish

✍ Scribed by Jörg Schmidtke; Wolfgang Engel

Publisher
Springer
Year
1975
Tongue
English
Weight
369 KB
Volume
13
Category
Article
ISSN
0006-2928

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✦ Synopsis

In phylogenetically diploid and tetrapIoid 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 poIyploids to regulate their genie activity down to the level of the diploids.

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Gene action in fish of tetraploid origin
Gene action in fish of tetraploid origin. II. Cellular and biochemical parameters in clupeoid and salmonoid fish
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By use of cell size, protein and hemoglobin content, and enzyme activities as markers, it becomes apparent that in the course of evolution the gene expression of anciently tetraploid fish of the order Ostariophysi was diploidized, but no such regulatory mechanism has evolved in the phylogenetically

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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 tha

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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

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PhylogeneticalIy 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 hypot