caa a22 4500 463209818 CHVBK 20180405153137.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s00412-006-0088-y doi (NATIONALLICENCE)springer-10.1007/s00412-006-0088-y Comparison of the Z and W sex chromosomal architectures in elegant crested tinamou ( Eudromia elegans ) and ostrich ( Struthio camelus ) and the process of sex chromosome differentiation in palaeognathous birds [Elektronische Daten] [Yayoi Tsuda, Chizuko Nishida-Umehara, Junko Ishijima, Kazuhiko Yamada, Yoichi Matsuda] To clarify the process of avian sex chromosome differentiation in palaeognathous birds, we performed molecular and cytogenetic characterization of W chromosome-specific repetitive DNA sequences for elegant crested tinamou (Eudromia elegans, Tinamiformes) and constructed comparative cytogenetic maps of the Z and W chromosomes with nine chicken Z-linked gene homologues for E. elegans and ostrich (Struthio camelus, Struthioniformes). A novel family of W-specific repetitive sequences isolated from E. elegans was found to be composed of guanine- and cytosine-rich 293-bp elements that were tandemly arrayed in the genome as satellite DNA. No nucleotide sequence homologies were found for the Struthioniformes and neognathous birds. The comparative cytogenetic maps of the Z and W chromosomes of E. elegans and S. camelus revealed that there are partial deletions in the proximal regions of the W chromosomes in the two species, and the W chromosome is more differentiated in E. elegans than in S. camelus. These results suggest that a deletion firstly occurred in the proximal region close to the centromere of the acrocentric proto-W chromosome and advanced toward the distal region. In E. elegans, the W-specific repeated sequence elements were amplified site-specifically after deletion of a large part of the W chromosome occurred. Springer-Verlag, 2007 Tsuda Yayoi Laboratory of Cytogenetics, Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut Nishida-Umehara Chizuko Laboratory of Cytogenetics, Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut Ishijima Junko Laboratory of Animal Cytogenetics, Division of Genome Dynamics, Creative Research Initiative "Sousei”, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut Yamada Kazuhiko Laboratory of Animal Cytogenetics, Division of Genome Dynamics, Creative Research Initiative "Sousei”, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut Matsuda Yoichi Laboratory of Cytogenetics, Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut Chromosoma Springer-Verlag 116/2(2007-04-01), 159-173 0009-5915 116:2<159 2007 116 412 https://doi.org/10.1007/s00412-006-0088-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00412-006-0088-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tsuda Yayoi Laboratory of Cytogenetics, Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut NATIONALLICENCE 700 1- Nishida-Umehara Chizuko Laboratory of Cytogenetics, Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut NATIONALLICENCE 700 1- Ishijima Junko Laboratory of Animal Cytogenetics, Division of Genome Dynamics, Creative Research Initiative "Sousei”, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut NATIONALLICENCE 700 1- Yamada Kazuhiko Laboratory of Animal Cytogenetics, Division of Genome Dynamics, Creative Research Initiative "Sousei”, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut NATIONALLICENCE 700 1- Matsuda Yoichi Laboratory of Cytogenetics, Division of Bioscience, Graduate School of Environmental Earth Science, Hokkaido University, North 10 West 8, Kita-ku, 060-0810, Sapporo, Japan aut NATIONALLICENCE 773 0- Chromosoma Springer-Verlag 116/2(2007-04-01), 159-173 0009-5915 116:2<159 2007 116 412 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer