The alternative transcription and expression characterization of in autotetraploid .

Established autotetraploids often have a highly stable meiosis with high fertility compared with neo-autotetraploids. The autotetraploid (4n = 200, RRRR) (4nRR), which stemmed from whole-genome duplication of red var. (2n = 100, RR) (RCC), produces diploid gametes with an adopted diploid-like chromosome pairing in meiosis and maintains the formation of autotetraploid lineages. In this study, we focused on , a meiosis-specific recombinase during the prophase of meiosis I, and elaborated on the genetic variation, alternative transcription, expression characterization, and epigenetic modification of in RCC and 4nRR. Two original from RCC were identified in 4nRR, and two duplicated differences in genetic composition were observed in 4nRR. Furthermore, we only noticed that one original and one duplicated were expressed in RCC and 4nRR, respectively. However, both possessed identical gene expression profiles, differential expression of sexual dimorphism, and hypomethylation levels. These results indicated that the specific expression of duplicated may be involve in the progression of meiosis of the diploid-like chromosome pairing in autotetraploid . Herein, the findings significantly increase knowledge of meiosis of autopolyploid fish and provide meaningful insights into genetic breeding in polyploidy fish.