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The molecular basis of chromosome orthologies and sex chromosomal differentiation in palaeognathous birds

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/30225

Title: The molecular basis of chromosome orthologies and sex chromosomal differentiation in palaeognathous birds
Authors: Nishida-Umehara, Chizuko Browse this author
Tsuda, Yayoi Browse this author
Ishijima, Junko Browse this author
Ando, Junko Browse this author
Fujiwara, Atushi Browse this author
Matsuda, Yoichi Browse this author
Griffin, Darren K. Browse this author
Keywords: chromosome painting
gene mapping
sex chromosome
Struthioniformes
Tinamiformes
Issue Date: Oct-2007
Publisher: Springer Netherlands
Journal Title: Chromosome Research
Volume: 15
Issue: 6
Start Page: 721
End Page: 734
Publisher DOI: 10.1007/s10577-007-1157-7
Abstract: Palaeognathous birds (Struthioniformes and Tinamiformes) have morphologically conserved karyotypes and less differentiated ZW sex chromosomes. To delineate interspecific chromosome orthologies in palaeognathous birds we conducted comparative chromosome painting with chicken (Gallus gallus, GGA) chromosome 1–9 and Z chromosome paints (GGA1–9 and GGAZ) for emu, double-wattled cassowary, ostrich, greater rhea, lesser rhea and elegant crested tinamou. All six species showed the same painting patterns: each probe was hybridized to a single pair of chromosomes with the exception that the GGA4 was hybridized to the fourth largest chromosome and a single pair of microchromosomes. The GGAZ was also hybridized to the entire region of the W chromosome, indicating that extensive homology remains between the Z and W chromosomes on the molecular level. Comparative FISH mapping of four Z- and/or W-linked markers, the ACO1/IREBP, ZOV3 and CHD1 genes and the EE0.6 sequence, revealed the presence of a small deletion in the proximal region of the long arm of the W chromosome in greater rhea and lesser rhea. These results suggest that the karyotypes and sex chromosomes of palaeognathous birds are highly conserved not only morphologically, but also at the molecular level; moreover, palaeognathous birds appear to retain the ancestral lineage of avian karyotypes.
Rights: The original publication is available at www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/30225
Appears in Collections:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 西田 千鶴子

 

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