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Corpus Systématique Animale

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Satellite DNAs, Heterochromatin and sex chromosomes in Chionodraco hamatus (Channichthyidae, Perciformes)

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  • T. Capriglione 1
  • A. Morescalchi 2
  • E. Olmo 3
  • L. Rocco 1
  • V. Stingo 1
  • S. Manzo 1
  • 1) Dipartimento di Biologia Evolutiva e Comparata, Via Mezzocannone 8, I-80134, Napoli, Italy
  • 2) Istituto di Anatomia Comparata, Viale Benedetto XV, 5, I-16132, Genova, Italy
  • 3) Istituto di Biologia e Genetica, Via delle Brecce Bianche, 1-60100, Ancona, Italy

We studied the genome of an antarctic ice fish, Chionodraco hamatus, in order to detect highly repetitive DNAs that may play a role in heterochromatinization processes and sex chromosome differentiation. We used two different experimental approaches. Hybridization of a Bkm probe to genomic DNA showed slight differences between the two sexes. Using restriction enzymes, a Bgl II satellite (pIF) was isolated. In situ hybridization revealed a preferential localization of pIF on the centromeres and the telomeres of most chromosomes, as well as an interstitial band on the long arms of the neo-Y sex chromosome, where probably the hypothetical fusion took place. Dot-blot experiments showed that pIF is still present in species belonging to different families of the same suborder. Though preliminary, our results suggest a conservative nature of this DNA which might have played a definite functional role in the genome of these polar fishes.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - psychologie. psychophysiologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - General Agricultural and Biological Sciences
Catégories WoS
  • 1 - science ; 2 - ecology
  • 1 - science ; 2 - biodiversity conservation
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Polar Biology

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