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Multiple sex chromosome system of X1X1X2X2/X1X2Y type in lutjanid fish, Lutjanus quinquelineatus (Perciformes)

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Abstract

The karyotype and other chromosomal markers as revealed by C-banding and Ag-staining were studied in Lutjanus quinquelineatus and L. kasmira (Lutjanidae, Perciformes). While in latter species, the karyotype was invariably composed of 48 acrocentric chromosomes in both sexes, in L. quinquelineatus the female karyotype had exclusively 48 acrocentric chromosomes (2n = 48) but that of the male consisted of one large metacentric and 46 acrocentric chromosomes (2n = 47). The chromosomes in the first meiotic division in males showed 22 bivalents and one trivalent, which was formed by an end-to-end association and a chiasmatic association. Multiple sex chromosome system of X1X1X2X2/X1X2Y type resulting from single Robertsonian fusion between the original Y chromosome and an autosome was hypothesized to produce neo-Y sex chromosome. The multiple sex chromosome system of L. quinquelineatus appears to be at the early stage of the differentiation. The positive C-banded heterochromatin was situated exclusively in centromeric regions of all chromosomes in both species. Similarly, nucleolus organizer region sites were identified in the pericentromeric region of one middle-sized pair of chromosomes in both species. The cellular DNA contents were the same (3.3 pg) between the sexes and among this species and related species.

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Correspondence to Akinori Takai.

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Ueno, K., Takai, A. Multiple sex chromosome system of X1X1X2X2/X1X2Y type in lutjanid fish, Lutjanus quinquelineatus (Perciformes). Genetica 132, 35–41 (2008). https://doi.org/10.1007/s10709-007-9146-5

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