XX/XY sex chromosome system and chromosome markers in the snake eel Ophisurus serpens (Anguilliformes: Ophichtidae). Issue 2 (7th February 2018)

• Record Type: Journal Article
• Authors: Salvadori, Susanna; Deiana, Anna Maria; Deidda, Federica; Lobina, Cinzia; Mulas, Antonello; Coluccia, Elisabetta
• Is Part Of: Marine biology research. Volume 14:Issue 2(2018)
• Page Start: 158
• Page End: 164
• Publication Date: 2018-02-07
• Subjects: Audrey J. Geffen; Anguilliformes -- karyotype evolution -- Ophisurus serpens -- rDNA -- telomeric sequences -- XX/XY sex chromosome system; Marine biology -- Periodicals; Marine biology -- North Atlantic Ocean -- Periodicals; 578.7705
• DOI: 10.1080/17451000.2017.1406665
• Languages: English
• ISSNs: 1745-1000

Abstract

ABSTRACT: We report evidence of an XX/XY sex chromosome system in the snake eel Ophisurus serpens (Anguilliformes: Ophichthidae). We characterized the male and female karyotypes by C-, replication- and Hae III-bandings. The 45S and 5S ribosomal gene families were located using dual fluorescence in situ hybridization, which showed that the 5S rDNA sites were present on the X chromosome, beside an autosome pair. FISH with a telomeric peptide nucleic acid probe enabled recognition of Interstitial Telomeric Sequences (ITSs), likely remnants of chromosomal rearrangements, in five chromosome pairs, including the rDNA-bearing ones. Possible mechanisms of the origin of sex chromosomes in this species are discussed, considering the presence of a sex-linked marker and ITSs.