The ZW Micro-Sex Chromosomes of the Chinese Soft-Shelled Turtle (Pelodiscus sinensis, Trionychidae, Testudines) Have the Same Origin as Chicken Chromosome 15

被引：96

作者：

Kawagoshi, T. ^{[2
]}

Uno, Y. ^{[2
]}

Matsubara, K.

Matsuda, Y. ^{[1
,2
]}

Nishida, C. ^{[2
]}

机构：

[1] Hokkaido Univ, Grad Sch Sci, Dept Biol Sci, Kita Ku, Sapporo, Hokkaido 0600810, Japan

[2] Hokkaido Univ, Grad Sch Life Sci, Biosyst Sci Course, Lab Anim Cytogenet, Sapporo, Hokkaido 0600810, Japan

来源：

CYTOGENETIC AND GENOME RESEARCH | 2009年 / 125卷 / 02期

关键词：

Chicken; Chromosome homology; Chromosome rearrangement; Comparative mapping; FISH; Reptile; Sex chromosome; Sex determination; Turtle; ZW; MITOCHONDRIAL GENOMES; VERTEBRATE EVOLUTION; OVARIAN DEVELOPMENT; BIRDS; DIFFERENTIATION; R-SPONDIN1; GENES; REARRANGEMENTS; LINEAGES; HOMOLOGY;

D O I：

10.1159/000227837

中图分类号：

Q2 [细胞生物学];

学科分类号：

071009 ; 090102 ;

摘要：

The Chinese soft-shelled turtle (Pelodiscus sinensis, Trionychidae, Testudines) has ZZ/ZW-type micro-sex chromosomes where the 18S-28S ribosomal RNA genes (18S-28S rDNA) are located. The W chromosome is morphologically differentiated from the Z chromosome by partial deletion and amplification of 18S-28S rDNA and W-specific repetitive sequences. We recently found a functional gene (TOP3B) mapped on the P. sinensis Z chromosome, which is located on chicken (Gallus gallus, GGA) chromosome 15. Then we cloned turtle homologues of 4 other GGA15-linked genes (GIT2, NF2, SBNO1, SF3A1) and localized them to P. sinensis chromosomes. The 4 genes all mapped on the Z chromosome, and 2 of them (SBNO1, SF3A1) were also localized to the W chromosome. Our mapping data suggest that at least one large inversion occurred between GGA15 and the P. sinensis Z chromosome, and that there are homologous regions in the distal portions of both the short and long arms between the Z and W chromosomes. W chromosomal differentiation in P. sinensis probably proceeded by the deletion of the proximal chromosomal region followed by 18S-28S rDNA amplification, after a paracentric inversion occurred at the breakpoints between the distal region of 18S-28S rDNA and the proximal region of SBNO1 on the Z chromosome. Copyright (C) 2009 S. Karger AG, Basel

引用

页码：125 / 131

页数：7

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