Structural differences in the chromatin from compartmentalized cells of the sea urchin embryo: differential nuclease accessibility of micromere chromatin.


Journal Article

The chromatin structure of three cell types isolated from the 16-cell stage sea urchin embryo has been probed with micrococcal nuclease. In micromeres, the four small cells at the vegetal pole, the chromatin is found to be considerably more resistant to degradation by micrococcal nuclease than chromatin in the larger mesomere and macromere cells which undergo more cellular divisions and are committed to different developmental fates. The micromeres show an order of magnitude decrease in the initial digestion rate and a limit digest value which is one third that of the larger blastomeres; both observations are suggestive of the formation of a more condensed chromatin structure during the process of commitment, or as the rate of cell division decreases. The decreased sensitivity to nuclease for micromeres is similar to results reported for sperm and larval stages of development.

Full Text

Duke Authors

Cited Authors

  • Cognetti, G; Shaw, BR

Published Date

  • November 1, 1981

Published In

Volume / Issue

  • 9 / 21

Start / End Page

  • 5609 - 5621

PubMed ID

  • 7312627

Pubmed Central ID

  • 7312627

Electronic International Standard Serial Number (EISSN)

  • 1362-4962

International Standard Serial Number (ISSN)

  • 0305-1048

Digital Object Identifier (DOI)

  • 10.1093/nar/9.21.5609


  • eng