Studies on the intranuclear distribution and properties of mouse satellite DNA

Carl L. Schildkraut, Joseph J. Maio

Research output: Contribution to journalArticlepeer-review

88 Scopus citations


Nucleoli isolated from mouse strain L-cells, L-5178Y lymphoblast tumor cells, and mouse liver and kidney cells showed a 3-4-fold enrichment in satellite DNA when compared with DNA from whole nuclei. This amount of satellite DNA associated with the nucleoli accounted for approximately one-third of the total satellite DNA of the cell. Treating the nucleoli with 2 M NaCl removed more main band DNA than satellite, and suggested that satellite DNA was more intimately bound to the nucleoli than main band DNA. However, attempts to demonstrate whether the satellite enrichment could have been due to preferential adsorption to the nucleoli during their isolation were inconclusive. Incubation of native or renatured satellite DNA with Escherichia coli exonuclease I did not produce any change in its buoyant density in CsCl. The base composition of satellite DNA was determined by using three different combinations of enzymes. Incubation with E. coli exonuclease III produced an increase in CsCl buoyant density and converted 45% of the satellite DNA to mononucleotides having the same average base composition as the total DNA. The satellite DNA did not behave differently from the main band DNA towards the deoxyribonucleases used in this study.

Original languageEnglish (US)
Pages (from-to)76-93
Number of pages18
JournalBBA Section Nucleic Acids And Protein Synthesis
Issue number1
StatePublished - Jun 18 1968

ASJC Scopus subject areas

  • General Medicine


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