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Comparative painting reveals strong chromosome homology over 80 million years of bird evolution.

Authors
Type
Published Article
Journal
Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology
Publication Date
Volume
7
Issue
4
Pages
289–295
Identifiers
PMID: 10461874
Source
Medline
License
Unknown

Abstract

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).

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