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

被引:101
作者
Nishida-Umehara, Chizuko
Tsuda, Yayoi
Ishijima, Junko
Ando, Junko
Fujiwara, Atushi
Matsuda, Yoichi
Griffin, Darren K.
机构
[1] Hokkaido Univ, Div Genome Dynam, Lab Anim Cytogenet, Creat Res Initiat Sousei,Kita Ku, Sapporo, Hokkaido 060, Japan
[2] Hokkaido Univ, Grad Sch Environm Earth Sci, Lab Cytogenet, Div Biosci, Sapporo, Hokkaido 0600810, Japan
[3] Natl Res Inst Aquaculture, Fisheries Res Agcy, Immunol Sect, Tamaki Mie 5190423, Japan
[4] Univ Kent, Dept Biosci, Canterbury CT2 7NJ, Kent, England
基金
英国生物技术与生命科学研究理事会;
关键词
chromosome painting; gene mapping; sex chromosome; Struthioniformes; Tinamiformes;
D O I
10.1007/s10577-007-1157-7
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
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.
引用
收藏
页码:721 / 734
页数:14
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