Format

Send to

Choose Destination
EMBO J. 1992 Mar;11(3):1217-25.

Delineation of DNA replication time zones by fluorescence in situ hybridization.

Author information

1
Department of Cellular Biochemistry, Hebrew University, Hadassah Medical School, Jerusalem, Israel.

Abstract

Fluorescence in situ hybridization has been used to visualize specific genomic DNA sequences in interphase nuclei. In normal diploid cells, unreplicated DNA segments give singlet hybridization signals while replicated loci are characterized by doublets. The distribution of these two patterns in unsynchronized cell populations can be used to determine the S phase replication time of any DNA sequence. The validity of this approach was established by analyzing genes whose replication profiles in expressing and non-expressing cells had been determined previously by conventional methods. Using this technique it has been possible to map the replication timing topography of the DNA within and flanking the cystic fibrosis (CF) gene locus on chromosome 7. The gene itself is located within a defined time zone which is approximately 500 kb in length and is under developmental control. It is early replicating in cells which express CF but late replicating in other cell types. These time zones probably represent basic units of chromosome structure.

PMID:
1547781
PMCID:
PMC556564
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Wiley Icon for PubMed Central
Loading ...
Support Center