Nucleosome distribution on the J sub( Kappa ) and C sub( Kappa ) immunoglobulin gene segments of mouse liver chromatin

The chromatin structure of the transcriptionally inactive kappa immunoglobulin gene in mouse liver was investigated by mainly employing indirect endlabeling on Bsp RI restriction nuclease digestions of intact nuclei. The disclosed strong (about 85%) but not uniform protection of the Bsp RI sites by nucleosomes is inconsistent with both a uniquely seguence-oriented localization and a completely random distribution of nucleosomes in this region of the genome. Several possibly applicable models are discussed.