Related Experiment Video

Updated: Mar 8, 2026

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
09:39

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes

Published on: December 20, 2014

15.8K

Protein Phosphatase 1 Down Regulates ZYG-1 Levels to Limit Centriole Duplication

Nina Peel1, Jyoti Iyer2, Anar Naik1

  • 1Department of Biology, The College of New Jersey, Ewing, NJ, United States of America.

Plos Genetics
|January 20, 2017
PubMed

Insights

Scientists discovered a new pathway regulating centriole duplication. Protein phosphatase 1 (PP1) controls levels of the ZYG-1 protein, crucial for centriole duplication, impacting cell division and development.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Centriole duplication is essential for cell division and organism development.
  • Dysregulation of centriole number is linked to human diseases like cancer and microcephaly.
  • The precise mechanisms controlling the levels of the key centriole duplication factor ZYG-1 are not fully understood.

Purpose of the Study:

  • To investigate the regulation of ZYG-1 protein levels and its role in centriole duplication.
  • To identify novel factors involved in controlling centriole copy number.
  • To elucidate the pathway governing ZYG-1 regulation.

Main Methods:

  • Utilized C. elegans as a model organism.
  • Employed genetic screening and molecular biology techniques.
  • Investigated the function of PP1 orthologs (GSP-1, GSP-2) and their regulators (SZY-2, SDS-22) in relation to ZYG-1.

Main Results:

  • Identified GSP-1 and GSP-2 (PP1 orthologs) and SZY-2 and SDS-22 as key regulators of ZYG-1 protein levels.
  • Down-regulation of PP1 activity or mutation of its regulators rescues centriole duplication defects in zyg-1 mutants by increasing ZYG-1 levels.
  • PP1 regulates ZYG-1 via a post-translational mechanism.
  • Inhibition of PP1 in wild-type cells leads to centriole amplification, producing multiple daughter centrioles.

Conclusions:

  • Defined a novel pathway involving PP1 that limits the number of daughter centrioles produced per cell cycle.
  • This pathway plays a critical role in maintaining appropriate centriole copy number.
  • Findings provide new insights into the regulation of centriole duplication and its implications for human health.

More Related Videos

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay12:26

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

Published on: May 3, 2018

19.4K
Quantitative PCR-based Assay to Measure Sonic Hedgehog Signaling in Cellular Model of Ciliogenesis07:26

Quantitative PCR-based Assay to Measure Sonic Hedgehog Signaling in Cellular Model of Ciliogenesis

Published on: January 31, 2025

1.1K

Related Concept Videos

Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
38.7K
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
6.1K
Separation of Sister Chromatids02:17

Separation of Sister Chromatids

At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
4.6K
Anaphase Promoting Complex00:50

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
3.5K
Centrosome Duplication02:25

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...
5.1K
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
5.3K