Comparative chromosome painting defines the high rate of karyotype changes between pigs and bovids

Comparative chromosome painting defines the high rate of karyotype changes between pigs and bovids Human and sheep chromosome-specific probes were used to construct comparative painting maps between the pig (Suiformes), cattle and sheep (Bovidae), and humans. Various yet unknown translocations were observed that would assist in a more complete reconstruction of homology maps of these species. The number of homologous segments that can be identified with sheep probes in the pig karyotype exceeds that described previously by chromosome painting between two non-primate mammals belonging to the same order. Sheep probes painted 62 segments on pig autosomes and delineated not only translocations, but also 9 inversions. All inversions were paracentric and indicate that these rearrangements may be characteristic for chromosomal changes in suiforms. Hybridizations of all sheep painting probes to cattle chromosomes confirmed the chromosome conservation in bovids. In addition, we observed a small translocation that was previously postulated from linkage mapping data, but was not yet described by physical mapping. The chromosome painting data are complemented with a map of available comparative gene mapping data between pig and sheep genomes. A detailed table listing the comparative gene mapping data between pig and cattle genomes is provided. The reanalysis of the pig karyotype with a new generation of human paint probes provides an update of the human/pig comparative genome map and demonstrates two new chromosome homologies. Seven conserved segments not yet identified by chromosome painting are also reported. Mammalian Genome Springer Journals

Comparative chromosome painting defines the high rate of karyotype changes between pigs and bovids

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Copyright © 2001 by Springer-Verlag New York Inc.
Life Sciences; Cell Biology; Animal Genetics and Genomics; Human Genetics
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