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Related Experiment Videos

Assay of centromere function using a human artificial chromosome

H Masumoto1, M Ikeno, M Nakano

  • 1Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan. g44478a@nucc.cc.nagoya-u.ac.jp

Chromosoma
|January 23, 1999
PubMed
Summary
This summary is machine-generated.

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Researchers defined a functional human centromere sequence using artificial chromosomes. The alpha21-I alphoid DNA efficiently formed stable minichromosomes, demonstrating de novo centromere assembly.

Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Defining functional human centromere sequences is crucial for understanding chromosome stability and dynamics.
  • Artificial chromosomes provide a platform to study centromere formation and function in a controlled manner.

Purpose of the Study:

  • To identify and characterize functional human centromere DNA sequences.
  • To investigate the de novo formation of active centromere/kinetochore structures.

Main Methods:

  • Construction of yeast artificial chromosomes (YACs) containing human alphoid DNA from chromosome 21.
  • Introduction of mammalian telomere repeats and a selectable marker into YACs.
  • Transfection of modified YACs into cultured human cells and subsequent cytological analysis.

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Main Results:

  • A YAC with alpha21-I alphoid DNA, rich in CENP-B boxes, efficiently formed stable 1-5 Mb minichromosomes in human cells.
  • These minichromosomes correctly aligned at metaphase plates and segregated during anaphase.
  • Minichromosomes were formed de novo and bound key centromere proteins (CENP-A, -B, -C, -E).
  • A YAC with alpha21-II alphoid DNA, lacking CENP-B boxes, failed to produce minichromosomes.

Conclusions:

  • The alpha21-I alphoid DNA sequence is capable of inducing the de novo assembly of functional centromere/kinetochore structures.
  • The presence of CENP-B boxes and a regular repeat array in alphoid DNA are critical for minichromosome formation and centromere function.