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The autotetraploid fish (4 n  = 200, RRRR) (abbreviated as 4 n RR) resulted from the whole genome duplication of red crucian carp ( Carassius auratus  red var., 2 n  = 100, RR) (abbreviated as RCC). During investigation of the influence of polyploidization on organization and evolution of the multigene family of  5S  rDNA, molecular organization and chromosomal localization of the  5S  rDNA were characterized in autotetraploid fish. By sequence analysis of the coding region ( 5S ) and adjacent non-transcribed spacer (NTS), three distinct  5S  rDNA units (type I: 203 bp; type II: 340 bp; and type III: 477bp) were identified and characterized in 4 n RR. These  5S  rDNA units were inherited from their female parent (RCC), in which obvious base variations in NTS and array recombination of repeat units were found. Using fluorescence  in situ  hybridization employing different  5S  rDNA units as probes, these  5S  rDNA clusters were localized in chromosomes of 4 n RR, respectively, and showed obvious loss of chromosomal loci (type I and type II). Our data revealed genetic variation of the  5S  rDNA multigene family in the genome of autopolyploid fish. Furthermore, results provided new insights into the evolutionary patterns of this vertebrate multigene family.

frontiers in genetics

Molecular Organization and Chromosomal Localization Analysis of 5S rDNA Clusters in Autotetraploids Derived From Carassius auratus Red Var. (♀) × Megalobrama amblycephala (♂)