Cioffi M B, Molina W F, Moreira-Filho O, Bertollo L A C
Departamento de Genética e Evolução, Universidade Federal de São Carlos, Brazil. mbcioffi @ ufscar.br
Cytogenet Genome Res. 2011;134(4):295-302. doi: 10.1159/000329481. Epub 2011 Jun 29.
The arrangement of 6 repetitive DNA sequences in the mitotic and meiotic sex chromosomes of 2 Erythrinidae fish, namely Hoplias malabaricus and Erythrinus erythrinus, both with a multiple X(1)X(1)X(2)X(2)/X(1)X(2)Y sex chromosome system, was analyzed using fluorescence in situ hybridization. The distribution patterns of the repetitive sequences were distinct for each species. While some DNA repeats were species-specific, others were present in the sex chromosomes of both species at different locations. These data, together with the different morphological types of sex chromosomes and the distinct chromosomal rearrangements associated with the formation of the neo-Y chromosomes, support the plasticity of sex chromosome differentiation in the Erythrinidae family. Our present data highlight that the sex chromosomes in fish species may follow diverse differentiation patterns, even in the same type of sex chromosome system present in cofamiliar species.
利用荧光原位杂交技术，分析了2种红牙鱼旨科鱼类，即马拉开波湖狼脂鲤（Hoplias malabaricus）和红牙鱼旨（Erythrinus erythrinus）有丝分裂和减数分裂性染色体中6个重复DNA序列的排列情况。这两种鱼均具有多重X(1)X(1)X(2)X(2)/X(1)X(2)Y性染色体系统。重复序列的分布模式在每个物种中都不同。虽然一些DNA重复序列是物种特异性的，但其他一些在两个物种的性染色体中位于不同位置。这些数据，连同性染色体的不同形态类型以及与新Y染色体形成相关的明显染色体重排，支持了红牙鱼旨科中性染色体分化的可塑性。我们目前的数据突出表明，鱼类物种中的性染色体可能遵循不同的分化模式，即使在亲缘关系相近的物种中存在相同类型的性染色体系统也是如此。
