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Chiasma interference is blind to centromeres

P C Colombo1, G H Jones

  • 1Depto. de Cs. Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.

Heredity
|August 1, 1997
PubMed
Summary

The centromere does not block chiasma interference. Our study shows that interference acts across the centromere, influencing chiasma formation probability in both arms.

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Area of Science:

  • Genetics
  • Cytogenetics
  • Molecular Biology

Background:

  • The centromere's role in chiasma positioning has been debated since Mather's work.
  • It was widely assumed that the centromere acts as a barrier to chiasma interference.

Purpose of the Study:

  • To reassess the role of the centromere in chiasma interference.
  • To determine if interference acts across the centromere.

Main Methods:

  • Analysis of large chiasma datasets from grasshoppers (Leptysma argentina and Chorthippus brunneus).
  • Application of statistical methods, including coincidence calculation and correlation of distances between centromeres and nearest chiasmata.

Main Results:

  • Statistical analyses indicate that interference operates across the centromere.
  • The presence of an intervening centromere does not alter the action of interference.

Conclusions:

  • The centromere does not function as a barrier to chiasma interference.
  • Chiasma interference can act bidirectionally across the centromere, affecting both chromosome arms.

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