Construction of neocentromere-based human minichromosomes by telomere-associated chromosomal truncation Academic Article uri icon

abstract

  • Neocentromeres (NCs) are fully functional centromeres that arise ectopically in noncentromeric regions lacking alpha-satellite DNA. Using telomere-associated chromosome truncation, we have produced a series of minichromosomes (MiCs) from a mardel(10) marker chromosome containing a previously characterized human NC. These MiCs range in size from approximately 0.7 to 1.8 Mb and contain single-copy intact genomic DNA from the 10q25 region. Two of these NC-based Mi-Cs (NC-MiCs) appear circular whereas one is linear. All demonstrate stability in both structure and mitotic transmission in the absence of drug selection. Presence of a functional NC is shown by binding a host of key centromere-associated proteins. These NC-MiCs provide direct evidence for mitotic segregation function of the NC DNA and represent examples of stable mammalian MiCs lacking centromeric repeats.

authors

  • Saffery, R
  • Wong, LH
  • Irvine, DV
  • Bateman, MA
  • Griffiths, B
  • Cutts, SM
  • Cancilla, MR
  • Cendron, AC
  • Stafford, AJ
  • Choo, KHA

publication date

  • May 8, 2001