Isolation and characterization of a major tandem repeat family from the human X chromosome.


Journal Article

We report the identification and characterization of a family of repeated restriction fragments whose molecular organization is apparently specific to the human X chromosome. This fragment, identified as an ethidium bromide-staining 2.0 kilobase (kb) band in BamHI-digested DNA from a Chinese hamster-human somatic cell hybrid containing a human X chromosome, has been cloned into pBR325 and characterized. The 2.0 kb repeated family has been assigned to the Xp11 leads to Xq12 region on the X by Southern blot analysis of somatic cell hybrids and is predominantly arranged in tandem clusters of up to seven 2.0 kb monomers. Homologous DNA sequences, not organized as 2.0 kb BamHI fragments, are found elsewhere on the X chromosome and on at least some autosomes, but are not found on the Y chromosome. From a dosing experiment using various amounts of the cloned repeat, we estimate that there are 5,000-7,500 copies of the 2.0 kb BamHI repeat per haploid genome. Since the vast majority, if not all, of these are confined to the X chromosome, this repeated DNA family must account for 5-10% of all X chromosome DNA and must constitute the major sequence component of the pericentromeric region of the X.

Full Text

Cited Authors

  • Willard, HF; Smith, KD; Sutherland, J

Published Date

  • April 1, 1983

Published In

Volume / Issue

  • 11 / 7

Start / End Page

  • 2017 - 2033

PubMed ID

  • 6300789

Pubmed Central ID

  • 6300789

Electronic International Standard Serial Number (EISSN)

  • 1362-4962

International Standard Serial Number (ISSN)

  • 1362-4962

Digital Object Identifier (DOI)

  • 10.1093/nar/11.7.2017


  • eng