Asynchronous replication of imprinted genes is established in the gametes and maintained during development

Itamar Simon, Toyoaki Tenzen, Benjamin E. Reubinoff, Dahlia Hillman, John R. McCarrey and Howard Cedar ()
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Itamar Simon: Hebrew University
Toyoaki Tenzen: Hebrew University
Benjamin E. Reubinoff: Hadassah Ein-Kerem University Hospital
Dahlia Hillman: Hadassah Ein-Kerem University Hospital
John R. McCarrey: Southwest Foundation for Biomedical Research
Howard Cedar: Hebrew University

Nature, 1999, vol. 401, issue 6756, 929-932

Abstract: Abstract Genomic imprinting is characterized by allele-specific expression of multiple genes within large chromosomal domains1 that undergo DNA replication asynchronously during S phase2,3. Here we show, using both fluorescence in situ hybridization analysis and S-phase fractionation techniques, that differential replication timing is associated with imprinted genes in a variety of cell types, and is already present in the pre-implantation embryo soon after fertilization. This pattern is erased before meiosis in the germ line, and parent-specific replication timing is then reset in late gametogenesis in both the male and female. Thus, asynchronous replication timing is established in the gametes and maintained throughout development, indicating that it may function as a primary epigenetic marker for distinguishing between the parental alleles.

Date: 1999
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DOI: 10.1038/44866

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