Laboratorio de Genética, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Polígono Río San Pedro, Puerto Real, Cádiz, Spain.
J Mol Evol. 2013 Mar;76(3):83-97. doi: 10.1007/s00239-013-9541-8. Epub 2013 Jan 26.
There has been considerable discussion in recent years on the evolution of the tandemly repeated multigene families, since some organisms show a concerted model whereas others show a birth-and-death model. This controversial subject extends to several species of fish. In this study, three species of the Sparidae family (Pagrus pagrus, P. auriga and Diplodus sargus) and an interspecific hybrid (P. pagrus (♀) × P. auriga (♂)) have been studied at both molecular and cytogenetic level, taking three different multigene families (5S rDNA, 45S rDNA and U2 snDNA). Results obtained with the 5S rDNA in P. pagrus and P. auriga are characterized by a considerable degree of conservation at the two levels; however, an extraordinary variation was observed in D. sargus at the two levels, which has never been found in other fishes studied to date. As a consequence of this, the evolutionary model of the multigene families is discussed considering the results obtained and others from the bibliography. The result obtained in the hybrid allowed the recombination frequency in each multigene family to be estimated.
近年来，关于串联重复多基因家族的进化一直存在大量讨论，因为有些生物表现出协同模型，而有些则表现出生存和死亡模型。这个有争议的主题延伸到了几种鱼类。在这项研究中，对三个鲷科物种（真鲷、黄鳍鲷和黄鲷）和一个种间杂种（真鲷（♀）×黄鳍鲷（♂））进行了分子和细胞遗传学水平的研究，使用了三种不同的多基因家族（5S rDNA、45S rDNA 和 U2 snDNA）。在真鲷和黄鳍鲷中的 5S rDNA 的结果表现出在两个水平上具有相当程度的保守性；然而，在黄鲷中观察到了在两个水平上的非凡变异，这在迄今为止研究过的其他鱼类中从未发现过。因此，考虑到获得的结果和文献中的其他结果，讨论了多基因家族的进化模型。杂种中获得的结果允许估计每个多基因家族的重组频率。
