Preferential accumulation of sex and Bs chromosomes in biarmed karyotypes by meiotic drive and rates of chromosomal changes in fishes

Abstract

Mechanisms of accumulation based on typical centromeric drive or of chromosomes carrying pericentric inversions are adjusted to the general karyotype differentiation in the principal Actinopterygii orders. Here, we show that meiotic drive in fish is also supported by preferential establishment of sex chromosome systems and B chromosomes in orders with predominantly bi-brachial chromosomes. The mosaic of trends acting at an infra-familiar level in fish could be explained as the interaction of the directional process of meiotic drive as background, modulated on a smaller scale by adaptive factors or specific karyotypic properties of each group, as proposed for the orthoselection model.

Chromosomal diversity in tropical reef fishes is related to body size and depth range

“…1). In general, our estimated rKDs are congruent with patterns of karyotype diversification postulated by previous authors (Galetti et al, 2000;Molina et al, 2014a).…”

“…The highest values in rKD-2n and rKD-NF were observed in Apogonidae, and lowest values in Haemulidae (Fig 1, Table S1). Two trends in karyotypic evolution of Actinopterygii fishes have been observed, with some lineages showing slow karyotypic evolution, and others showing fast chromosomal changes (Molina et al, 2014a). These patterns are clearly observed in our mapping of rKDs of tropical reef fishes (Fig.…”

“…Some lineages exhibit strong chromosomal conservatism (e.g., Haemulidae, Carangidae), whereas others vary substantially in their karyotypic macrostructure (e.g. Gobiidae, Pomacentridae) (Molina et al, 2014a). However, the factors leading to low or high rates of chromosomal diversity have not been clearly identified.…”

Atlantic surgeonfishes bear only minor microstructural changes in highly derived karyotypes

“…Indeed, the mapping of repetitive sequences in several families of this order, characterized by stable karyotypes, revealed a reduced phylogenetic variation (Motta-Neto et al, 2011a, b;Calado et al, 2013). On the other hand, heterochromatin heterogeneity has been reported in some fish groups with remarkable karyotypic changes such as Gobiidae (Caputo et al, 1997;Lima-Filho et al, 2014;Molina et al, 2014), Characidae (Mantovani et al, 2000), and Erythrinidae (Cioffi et al, 2009;Blanco et al, 2011). For instance, some species of marine Perciformes like Centropyge aurantonotus Burgess (1974) (Pomacanthidae), , and A. chirurgus (C) after Giemsa staining (left column), two-color FISH (middle column) with 18S rDNA (magenta signals), and 5S rDNA (green signals) probes and distribution of (TTAGGG)n sequences (right column).…”

A comparison of heterochromatic regions in three species of neotropical canids

“…However, a plausible mechanism could be based on female meiotic drive where, as has been proposed, a competition between homologous chromosomes for migration toward the functional oocyte (Molina et al, 2014;Pardo-Manuel de Villena and Sapienza, 2001;Zwick et al, 1999). Centromeric repeats mainly vary through expansion and contraction mechanisms produced by different mutational processes (Charlesworth et al, 1994).…”