Chromosome Research

, Volume 11, Issue 6, pp 605–618 | Cite as

Reconstruction of the ancestral karyotype of eutherian mammals

  • F. Richard
  • M. Lombard
  • B. Dutrillaux


Applying the parsimony principle, i.e. that chromosomes identical in species belonging to different taxa were likely to be present in their common ancestor, the ancestral karyotype of eutherian mammals (about 100 million years old) was tentatively reconstructed. Comparing chromosome banding with all ZOO-FISH data from literature or studied by us, this reconstruction can be proposed with only limited uncertainties. This karyotype comprised 50 chromosomes of which 40–42 were acrocentrics. Ten ancestral pairs of chromosomes were homologous to a single human chromosome: 5, 6, 9, 11, 13, 17, 18, 20, X and Y (human nomenclature). Nine others were homologous to a part of a human chromosome: 1p+q (proximal), 1q, 2p+q (proximal), 2q, part of 7, 8q, 10p, 10q and 19p (human nomenclature). Finally, seven pairs of chromosomes, homologs to human chromosomes 3 + 21, 4 + 8p, part of 7 + 16p, part of 12 + part of 22 (twice), 14+15, 16q+19q, formed syntenies disrupted in man.

ancestral chromosomes chromosome painting comparative cytogenetics Eutheria fluorescence in-situ hybridization mammals 


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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • F. Richard
    • 1
    • 2
  • M. Lombard
    • 1
  • B. Dutrillaux
    • 1
    • 3
  1. 1.UMR 147 CNRS, Institut Curie, Section RechercheParis Cedex 05France
  2. 2.Université de Versailles-Saint-QuentinVersaillesFrance
  3. 3.Département de Radiobiologie, CEA-DSVFontenay-aux-Roses(France)

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