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Reciprocal chromosome painting illuminates the history of genome evolution of the domestic cat, dog and human

Abstract

Domestic cats and dogs are important companion animals and model animals in biomedical research. The cat has a highly conserved karyotype, closely resembling the ancestral karyotype of mammals, while the dog has one of the most extensively rearranged mammalian karyotypes investigated so far. We have constructed the first detailed comparative chromosome map of the domestic dog and cat by reciprocal chromosome painting. Dog paints specific for the 38 autosomes and the X chromosomes delineated 68 conserved chromosomal segments in the cat, while reverse painting of cat probes onto red fox and dog chromosomes revealed 65 conserved segments. Most conserved segments on cat chromosomes also show a high degree of conservation in G-banding patterns compared with their canine counterparts. At least 47 chromosomal fissions (breaks), 25 fusions and one inversion are needed to convert the cat karyotype to that of the dog, confirming that extensive chromosome rearrangements differentiate the karyotypes of the cat and dog. Comparative analysis of the distribution patterns of conserved segments defined by dog paints on cat and human chromosomes has refined the human/cat comparative genome map and, most importantly, has revealed 15 cryptic inversions in seven large chromosomal regions of conserved synteny between humans and cats.

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Yang, F., Graphodatsky, A.S., O'Brien, P.C.M. et al. Reciprocal chromosome painting illuminates the history of genome evolution of the domestic cat, dog and human. Chromosome Res 8, 393–404 (2000). https://doi.org/10.1023/A:1009210803123

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  • DOI: https://doi.org/10.1023/A:1009210803123

  • cat
  • chromosome painting
  • comparative mapping
  • dog
  • evolution
  • human