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Related Experiment Videos

CENP-I is essential for centromere function in vertebrate cells.

Ai Nishihashi1, Tokuko Haraguchi, Yasushi Hiraoka

  • 1PRESTO, The Japan Science and Technology Corporation, National Institute of Genetics and The Graduate University for Advanced Studies, Mishima, 411-8540, Shizuoka, Japan.

Developmental Cell
|April 24, 2002
PubMed
Summary

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40 years of CENP-A: the foundation of a new era of centromere biology.

Chromosoma·2025

We discovered a new centromere protein, CENP-I, essential for chromosome alignment and cell division. Its absence causes mitotic arrest and prevents cytokinesis, highlighting its critical role in cell cycle regulation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Centromeres are crucial for chromosome segregation during cell division.
  • Centromere protein A (CENP-A) is a key epigenetic marker of centromeres.
  • The function of many centromere proteins remains incompletely understood.

Purpose of the Study:

  • To identify and characterize novel essential centromere proteins.
  • To elucidate the role of the newly identified CENP-I in centromere function and cell division.
  • To determine the dependency of other centromere proteins on CENP-I.

Main Methods:

  • Sequence similarity analysis to identify potential homologous proteins.
  • Generation of a conditional loss-of-function mutant in chicken DT40 cells.

Related Experiment Videos

  • Immunocytochemistry to assess protein localization and cell cycle progression.

    • Main Results:

    • Identified CENP-I, a novel essential centromere protein homologous to fission yeast Mis6.
    • CENP-I colocalizes with CENP-A, CENP-C, and CENP-H throughout the cell cycle in vertebrate cells.
    • Loss of CENP-I leads to prometaphase arrest with misaligned chromosomes and failed cytokinesis.
    • CENP-I and CENP-H are required for CENP-C localization, but not CENP-A localization, to the centromere.

    Conclusions:

    • CENP-I is a vital component of the centromere essential for proper chromosome alignment and cell division.
    • CENP-I plays a critical role in the assembly and maintenance of the centromere complex, particularly in the localization of CENP-C.
    • The findings provide new insights into the molecular mechanisms of centromere function and cell cycle regulation.