Comparative painting reveals strong chromosome homology over 80 million years of bird evolution
Comparative painting reveals strong chromosome homology over 80 million years of bird evolution
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DOI：
10.1023/a:1009278914829
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发表时间：
1999-06-01
影响因子：
2.6
通讯作者：
Graves, JAM
中科院分区：
文献类型：
--
作者：
Shetty, S;Griffin, DK;Graves, JAM
鸡和不会飞的大鸸鹋属于两个亲缘关系较远的鸟类目，分别属于龙骨纲和平胸纲，它们至少在8000万年前分化。在鸟类之间的第一次ZOO-FISH研究中，我们将鸡（Gallus arteriticus）的单染色体颜料杂交到鸸鹋染色体上。我们发现，这两个物种之间的9个大染色体显示出显着的同源性，表明在进化过程中的核型很强的保守性。在鸸鹋中，一条鸡的大染色体（4）由一条大染色体和一条小染色体代表，表明小染色体和大染色体是可互换的。鸡的Z染色体涂料杂交鸸鹋Z和大部分的W，证实平胸类性染色体在很大程度上是同源的; W的着丝粒区域的杂交弱可能代表性别决定基因的位置。
Chickens and the great flightless emu belong to two distantly related orders of birds in the carinate and ratite subclasses that diverged at least 80 million years ago. In the first ZOO-FISH study between bird species, we hybridized single chromosome paints from the chicken (Gallus domesticus) onto the emu chromosomes. We found that the nine macrochromosomes show remarkable homology between the two species, indicating strong conservation of karyotype through evolution. One chicken macrochromosome (4) was represented by a macro- and a microchromosome in the emu, suggesting that microchromosomes and macrochromosomes are interconvertible. The chicken Z chromosome paint hybridized to the emu Z and most of the W, confirming that ratite sex chromosomes are largely homologous; the centromeric region of the W which hybridized weakly may represent the location of the sex determining gene(s).