Heterochromatin characterization of sex chromosomes in Triturus marmoratus (Urodela, Salamandridae)

1 January 1992

journal article
Published by S. Karger AG in Cytogenetic and Genome Research

Vol. 60 (2) , 150-153
https://doi.org/10.1159/000133327

Abstract

The sex chromosomes of the Iberian marbled newt, Triturus marmoratus, were studied using various banding techniques, including restriction enzyme/nick translation (RE/NT) procedures. Four types of heterochromatin on the sex chromosomes could be distinguished: (1) distamycin A/DAPI and chromomycin A3/distamycin A positive, EcoRI/NT negative, and HaeIII/Nυ and HinfI/NT positive; (2) distamycin A/DAPI and chromomycin A3/distamycin A positive, but RE/NT negative; (3) AT rich, but RE/NT negative; and (4) distamycin A/DAPI and chromomycin A3/distamycin A positive, EcoRl/NΙ and HinfI/NΙ negative, but Haelll/NT positive. These data suggest a common origin for the terminal heterochromatic domains of both the X and Y chromosomes in this species.

Keywords

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