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Replication in Eukaryotes

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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique

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Asymmetric bidirectional replication at the human DBF4 origin.

Julia Romero¹, Hoyun Lee

¹Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, 451 Smyth Road, Ottawa, Ontario K1H 8M5, Canada.

Nature Structural & Molecular Biology

|June 10, 2008

Summary

Researchers discovered a novel DNA replication mechanism in mammalian cells, termed asymmetric bidirectional replication, originating at the DBF4 promoter locus. This finding clarifies how genomes are faithfully duplicated each cell cycle.

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Area of Science:

Molecular Biology
Genetics
Cell Biology

Background:

Accurate genome duplication per cell cycle is crucial for genetic stability.
DNA replication origins regulate genome duplication.
Replication initiation mechanisms in mammalian cells remain incompletely understood compared to unicellular organisms.

Purpose of the Study:

To investigate and elucidate the DNA replication initiation mechanism in mammalian cells.
To identify and characterize novel origins of DNA replication.
To understand the regulation of DNA replication at specific genetic loci.

Main Methods:

Identification of a strong replication origin at the DBF4 promoter locus.
Characterization of the locus, including initiation zones, origin recognition complex (ORC) binding sites, and DNase I-hypersensitive regions.
Analysis of replication progression direction and strand-specific activation.

Main Results:

A novel mammalian replication origin was identified at the DBF4 promoter locus within a 1.5 kb region.
The locus contains two distinct initiation zones, each with an ORC binding site and DNase I-hypersensitive regions.
Replication initiates at zone I, progresses towards zone II (0.4 kb downstream) in the direction of transcription, and potentially involves zone II for opposite strand replication, a mode termed 'asymmetric bidirectional replication'.

Conclusions:

A new mode of DNA replication, 'asymmetric bidirectional replication', has been identified in mammalian cells.
The DBF4 promoter locus serves as a strong replication origin with unique initiation characteristics.
This discovery advances the understanding of DNA replication regulation and maintenance of genetic integrity in mammals.