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Distribution and linkage of repetitive clusters from the heterochromatic region of human chromosome 22

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The pericentric regions of eukaryotic chromosomes consist of several types of repetitive DNA families. In human chromosome 22, the organization of such families was studied in more detail. In addition to the known families of alpha and beta repeats, an additional repeat with a 48-bp motif was previously assigned to 22pter-q11. Here, we report in more detail the distribution of these repeat families, applying pulsed-field gel electrophoresis, fluorescencein situ hybridization and physical linkage on cosmid recombinants. At least two clusters of 48-bp repeats are localized on chromosome 22, one on the distal p-arm and one in the region 22cen-q11. Cosmids from a chromosome 22 library, containing both 48-bp and β-repeats, link both arrays on 22p and define their maximum distances to less than 44 kb. Loss of 48-bp repeat sequences in a Di-George cell line carrying a deletion in 22q11 suggests the presence of a second cluster in 22q11, a distribution supported by (fluorescenein situ hybridization)-FISH signal analysis. As additional members of the 48-bp repeat family can be found on all acrocentric chromosomes it remains to be determined whether the distribution seen on chromosome 22 is also common in other human acrocentric chromosomes.

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Correspondence to Carsten Pusch.

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accepted for publication by M. Schmid

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Müllenbach, R., Pusch, C., Holzmann, K. et al. Distribution and linkage of repetitive clusters from the heterochromatic region of human chromosome 22. Chromosome Res 4, 282–287 (1996).

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Key words

  • centromere
  • cosmid clone
  • 48-bp motif
  • fluorescencein situ hybridization
  • satellite DNA