Molecular Cloning and Characterization of the Repetitive DNA Sequences That Comprise the Constitutive Heterochromatin of the W Chromosomes of Medaka Fishes

Overview

Journal Chromosome Res

Date 2011 Nov 30

PMID 22124859

Citations 10

Authors

Yusuke Takehana

Kiyoshi Naruse

Yusuke Asada

Yoichi Matsuda

Tadasu Shin-I

Yuji Kohara

Asao Fujiyama

Satoshi Hamaguchi

Mitsuru Sakaizumi

Affiliations

Soon will be listed here.

Abstract

Among the medaka fishes of the genus Oryzias, most species have homomorphic sex chromosomes, while some species, such as Oryzias hubbsi and Oryzias javanicus, have heteromorphic ZW sex chromosomes. In this study, a novel family of repetitive sequence was molecularly cloned from O. hubbsi and characterized by chromosome in situ and filter hybridization, respectively. This repetitive element, which we designated as a BstNI family element, localized at heterochromatin regions on the W chromosome, as well as on two pairs of autosomes. Homologous sequences to this element were found only in O. javanicus, which is a sister species of O. hubbsi, suggesting that this repeated element originated in the common ancestor of these two species. However, the intensity of the hybridization signals was lower in O. javanicus than in O. hubbsi, and the chromosomal location of this element in O. javanicus was confined to heterochromatin regions on one pair of autosomes. Thus, we hypothesize that this repetitive element was extensively amplified in the O. hubbsi lineage, especially on its W chromosome, after the separation of the O. javanicus lineage. In addition, we also found the W chromosomal location of the 18S-28S ribosomal RNA genes in both O. hubbsi and O. javanicus. Our previous studies showed no linkage homology of the sex chromosomes in these species, indicating that the RNA genes were shared between W chromosomes of different origins. This situation may be explained by a translocation of the sex-determining region with the ribosomal RNA genes in either species or an independent accumulation of the RNA genes as a convergent process during W chromosome degeneration.

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