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. 1985 Apr 25;13(8):2731–2743. doi: 10.1093/nar/13.8.2731

Chromosome-specific alpha satellite DNA: nucleotide sequence analysis of the 2.0 kilobasepair repeat from the human X chromosome.

J S Waye, H F Willard
PMCID: PMC341190  PMID: 2987865

Abstract

The pericentromeric region of the human X chromosome is characterized by a tandemly repeated family of 2.0 kilobasepair (kb) DNA fragments, initially revealed by cleavage of human DNA with the restriction enzyme BamHI. We report here the complete nucleotide sequence of a cloned member of the repeat family and establish that this X-linked DNA family consists entirely of alpha satellite DNA. Our data indicate that the 2.0 kb repeat consists of twelve alpha satellite monomers arranged in imperfect, direct repeats. Each of the alpha X monomers is approximately 171 basepairs (bp) in length and is 60-75% identical in sequence to previously described primate alpha satellite DNAs. The twelve alpha X monomers are 65-85% identical in sequence to each other and are organized as two adjacent, related blocks of five monomers, plus an additional two monomers also related to monomers within the pentamer blocks. Partial nucleotide sequence of a second, independent copy of the 2.0 kb BamHI fragment established that the 2.0 kb repeat is, in fact, the unit of amplification on the X. Comparison of the sequences of the twelve alpha X monomers allowed derivation of a 171 bp consensus sequence for alpha satellite DNA on the human X chromosome. These sequence data, combined with the results of filter hybridization experiments of total human DNA and X chromosome DNA, using subregions within the 2.0 kb repeat as probes, provide strong support for the hypothesis that individual human chromosomes are characterized by different alpha satellite families, defined both by restriction enzyme periodicity and by chromosome-specific primary sequence.

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Selected References

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