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Table of Contents
Vol. 99, No. 1-4, 2002
Issue release date: 2002
Section title: Sex chromosome organization
Cytogenet Genome Res 99:303–309 (2002)
(DOI:10.1159/000071608)

X-chromosomal localization of mammalian Y-linked genes in two XO species of the Ryukyu spiny rat

Arakawa Y.a · Nishida-Umehara C.b,c · Matsuda Y.b,c · Sutou S.d · Suzuki H.a
aLaboratory of Ecology and Genetics, Graduate School of Environmental Earth Science, bLaboratory of Animal Cytogenetics, Center for Advanced Science and Technology, cChromosome Research Unit, Faculty of Science, Hokkaido University, Sapporo; and dFunctional Genomics, School of Pharmacy, Shujitsu University, Okayama (Japan)

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Article / Publication Details

First-Page Preview
Abstract of Sex chromosome organization

Received: December 17, 2002
Accepted: February 06, 2003
Published online: August 14, 2003
Issue release date: 2002

Number of Print Pages: 7
Number of Figures: 6
Number of Tables: 0

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR

Abstract

Ryukyu spiny rats (genus Tokudaia), which are endemic to the central part of the Nansei Shoto archipelago in Japan, have unique karyotypes with odd numbers of chromosomes and no cytologically recognizable Y chromosome. The chromosome numbers of Tokudaia osimensis from Amamioshima and of Tokudaia sp. from Tokunoshima are 2n = 25 and 2n = 45, respectively, with a putative single X chromosome. The mouse X probe hybridized to the unpaired X chromosome, except for the distal part of the short arm in a female specimen of T. osimensis and in one male and one female of Tokudaia sp. Fluorescence in situ hybridization with the Tspy (testis-specific protein, Y-encoded) gene from both male and female cells of Tokudaia sp. by PCR localized Tspy to the distal part of the long arm of the X chromosome. Another Y-related gene, Zfy, from Tokudaia sp. was also localized to the same region in both species. Although the Sry gene is absent in this species, the present results suggest that the Y-chromosome segment carrying functional Y-linked genes, such as Tspy and Zfy, is translocated onto the distal part of the long arm of the X chromosome.   

© 2003 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Sex chromosome organization

Received: December 17, 2002
Accepted: February 06, 2003
Published online: August 14, 2003
Issue release date: 2002

Number of Print Pages: 7
Number of Figures: 6
Number of Tables: 0

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR


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