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首页> 外文期刊>Molecular cytogenetics >Chromosomes of Asian cyprinid fishes: cytogenetic analysis of two representatives of small paleotetraploid tribe Probarbini
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Chromosomes of Asian cyprinid fishes: cytogenetic analysis of two representatives of small paleotetraploid tribe Probarbini

机译：亚洲鳖鱼类的染色体：小古单左侧部落部件两种代表的细胞遗传学分析

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Polyploidy, although still poorly explored, represents an important evolutionary event in several cyprinid clades. Herein, Catlocarpio siamensis and Probarbus jullieni - representatives of the paleotetraploid tribe Probarbini, were characterized both by conventional and molecular cytogenetic methods. Alike most other paleotetraploid cyprinids (with 2n?=?100), both species studied here shared 2n?=?98 but differed in karyotypes: C. siamensis displayed 18m?+?34sm?+?46st/a; NF?=?150, while P. jullieni exhibited 26m?+?14sm?+?58st/a; NF?=?138. Fluorescence in situ hybridization (FISH) with rDNA probes revealed two (5S) and eight (18S) signals in C. siamensis, respectively, and six signals for both probes in P. jullieni. FISH with microsatellite motifs evidenced substantial genomic divergence between both species. The almost doubled size of the chromosome pairs #1 in C. siamensis and #14 in P. jullieni compared to the rest of corresponding karyotypes indicated chromosomal fusions. Based on our findings, together with likely the same reduced 2n?=?98 karyotypes in the remainder Probarbini species, we hypothesize that the karyotype 2n?=?98 might represent a derived character, shared by all members of the Probarbini clade. Besides, we also witnessed considerable changes in the amount and distribution of certain repetitive DNA classes, suggesting complex post-polyploidization processes in this small paleotetraploid tribe.
机译：多倍体虽然仍然缺乏差，但代表了几个鲤鱼片中的重要进化事件。在此，通过常规和分子细胞遗传学方法表征了古立方四倍体部落ProParbini的Catlocarpio Siamensis和Probarbus Jullieni代表。与大多数其他古单甲基倍性酪蛋白（用2N？=？100），这里研究的两个物种共享2n？=？98但在核型中不同：C.暹芯显示18米？+ 34sm？+ +？46st / a; nf？=？150，而p. jullieni表现出26m？+ 14sm？+？58st / a; nf？=？138。荧光原位杂交（鱼类）与RDNA探针揭示了C.暹罗的两（5S）和8（18秒）信号，以及P. Jullieni的探针的六个信号。含有微卫星基质的鱼在两种物种之间证明了大量的基因组分歧。与其他相应的核型的其余部分表示染色体融合，染色体对＃1的染色体对＃1的几乎翻倍。基于我们的研究结果，在剩余的ProParbini物种中，可能相同的2N？= 98核型，我们假设核型2N？=？98可能代表一个由Proparbini Clade的所有成员共享的派生字符。此外，我们还目睹了某些重复DNA类别的量和分布的相当大的变化，旨在在该小古单型四倍体部落中复杂的多倍体化过程。

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