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Centrosome Duplication

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...

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Preparation of Peripheral Blood Mononuclear Cell Pellets and Plasma from a Single Blood Draw at Clinical Trial Sites for Biomarker Analysis

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MCPH1/BRIT1 limits ionizing radiation-induced centrosome amplification.

J A L Brown¹, E Bourke, C Liptrot

¹Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland.

|July 28, 2010

Summary

Microcephalin (MCPH1) deficiency causes abnormal centrosome amplification after DNA damage, impacting genome stability. This suggests a novel tumor suppressor role for MCPH1 in DNA repair and cell cycle control.

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Application of Laser Micro-irradiation for Examination of Single and Double Strand Break Repair in Mammalian Cells

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Published on: September 5, 2017

Area of Science:

Cell Biology
Molecular Oncology
DNA Damage Response

Background:

Microcephalin (MCPH1) is a centrosome-localized protein implicated in DNA damage checkpoints and genome stability.
Its precise role in tumor suppression, particularly after DNA damage, requires further elucidation.

Purpose of the Study:

To investigate the function of Microcephalin (MCPH1) in maintaining genome stability following DNA damage.
To determine the impact of MCPH1 disruption on centrosome duplication and DNA repair dynamics.

Main Methods:

Utilized the hyper-recombinogenic DT40 cell line with disrupted Mcph1 gene (Mcph1(-/-)).
Assessed cell viability, proliferation rates, G2-to-M checkpoint response, and radiosensitivity after ionizing radiation (IR).
Employed light and electron microscopy, and monitored IRIF formation (γ-H2AX, Rad51) and protein phosphorylation (Chk1, Cdk2).

Main Results:

Mcph1(-/-) cells exhibited moderate radiosensitivity and slower resolution of IRIF post-IR.
While centrosome structure was normal, IR induced massive centrosome amplification in Mcph1-deficient cells.
Sustained Chk1 phosphorylation and dysregulated Cdk2 activity were observed in Mcph1 null cells after IR.

Conclusions:

Microcephalin (MCPH1) plays a critical role in regulating centrosome numbers following DNA damage.
MCPH1 deficiency leads to aberrant centrosome amplification and impaired DNA damage resolution, suggesting a novel tumor suppressive mechanism.