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Related Experiment Video

Updated: Jun 8, 2026

A Method to Study de novo Formation of Chromatin Domains

A Method to Study de novo Formation of Chromatin Domains

Published on: August 23, 2019

A WD-repeat protein stabilizes ORC binding to chromatin.

Zhen Shen¹, Kizhakke M Sathyan, Yijie Geng

¹Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA.

|October 12, 2010

Summary

The origin recognition complex (ORC) is crucial for DNA replication. A newly identified protein, ORC-associated (ORCA), recruits ORC to chromatin, essential for cell cycle progression and DNA replication initiation.

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Area of Science:

Cell Biology
Molecular Biology
Genetics

Background:

The Origin Recognition Complex (ORC) is vital for initiating DNA replication and regulating cell cycle progression.
ORC binds to origin DNA during G1 and to heterochromatin in post-replicated cells in metazoans.
The regulatory mechanisms governing ORC's chromatin association remain largely unknown.

Purpose of the Study:

To identify and characterize factors regulating ORC's chromatin association.
To elucidate the role of LRWD1 (ORCA) in ORC-chromatin interactions and DNA replication.

Main Methods:

Protein interaction studies to identify ORCA's interaction with ORC.
Cellular localization and cell cycle analysis of ORCA and ORC.
Depletion studies using siRNA to assess the functional impact of ORCA on ORC binding, MCM binding, and cell cycle progression.

Main Results:

A conserved protein, LRWD1 (ORCA), was identified and shown to interact with ORC.
ORCA colocalizes with ORC and exhibits similar cell-cycle dynamics.
ORCA depletion leads to reduced ORC and MCM binding to chromatin and G1 phase accumulation.

Conclusions:

ORCA is a key regulator that recruits ORC to chromatin.
ORCA-mediated ORC chromatin association is critical for pre-replication complex assembly in G1.
ORCA plays a significant role in chromatin organization in post-G1 cells and overall cell cycle progression.