The proto-oncogene C-KIT maps to canid B-chromosomes Journal Articles uri icon

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  • Plant and animal karyotypes sometimes contain variable elements, that are referred to as additional or B-chromosomes. It is generally believed that B-chromosomes lack major genes and represent parasitic and selfish elements of a genome. Here we report, for the first time, the localization of a gene to B-chromosomes of mammals: red fox (Vulpes vulpes) and two subspecies of raccoon dog (Nyctereutes procyonoides). Identification of the proto-oncogene C-KIT on B-chromosomes of two Canidae species that diverged from a common ancestor more than 12.5 million years ago argues against the current view of B-chromosomes. Analyses of fox B-chromosomal C-KIT gene from a flow-sorted fox B-chromosome-specific library revealed the presence of intron-exon boundaries and high identity between sequenced regions of canine and fox B-chromosomal C-KIT copies. Identification of C-KIT gene on all B-chromosomes of two canid species provides new insight into the origin and evolution of supernumeraries and their potential role in the genome.


  • Grafodatskaya, Daria
  • Graphodatsky, Alexander S
  • Kukekova, Anna V
  • Yudkin, Dmitry V
  • Trifonov, Vladimir A
  • Vorobieva, Nadezhda V
  • Beklemisheva, Violetta R
  • Perelman, Polina L
  • Graphodatskaya, Daria A
  • Trut, Lyudmila N
  • Yang, Fengtang
  • Ferguson-Smith, Malcolm A
  • Acland, Gregory M
  • Aguirre, Gustavo D

publication date

  • February 2005