Triploidy and mosaicism in Liolaemus chiliensis (Sauria: Tropiduridae)

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Abstract:

A remarkable diversity of ploidy, i.e., diploidy, triploidy, and diploid–triploid mosaicism, was found among the somatic and testicular cells in a natural population of the lizard Liolaemus chiliensis from central Chile. Intra pop ulation, intersexual, and intraindividual ploidy variation is reported. In contrast with other species of polyploid reptiles, 86% of L. chiliensis males were mosaics (2n/3n) and 14% were diploids; 33% of females were triploid, 57.1% were mosaics, and 9.5% were diploid. Among 21 specimens, no triploid males were found in this sample. In the mosaic males, the diploid and triploid spermatogonia both enter meiosis, producing both reduced and unreduced metaphase II spermatocytes, most of them euploids. We discuss the origin for this ploidy in this iguanid lizard.Key words: Liolaemus chiliensis, triploidy, mosaicism for triploidy and diploidy, Sauria, Tropiduridae.

Une remarquable diversité quant à la ploïdie (diploïde, triploïde, mosaïque diploïde-triploïde) a été observée au sein des cellules somatiques et testiculaires chez une population naturelle du lézard Liolaemus chiliensis provenant du centre du Chili. Une variation de ploïdie est rapportée au sein de la population, entre les sexes et au sein des individus. Contrairement aux autres espèces de lézards polyploïdes, les mâles du L. chiliensis sont des mosaïques (2n/3n) dans 86 % des cas ou diploïdes (2n) dans 14 % des cas. Les femelles étaient triploïdes (33 %), des mosaïques (57,1 %) ou diploïdes (9,5 %). Aucun mâle triploïde n'a été observé parmi les 21 individus de l'échantillon. Chez les mâles mosaïques, les spermatogonies diploïdes et triploïdes entrent en méiose et produisent des métaphases II réduites et non-réduites, la plupart étant euploïdes. Les auteurs discutent de l'origine de cette ploïdie chez cet iguanidé.Mots clés : Liolaemus chiliensis, triploïdie, mosaïcisme pour la triploïdie et la diploïdie, sauriens, tropiduridés.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2006

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  • From its inception in 1957, this international cytogenetics journal has catered to the research areas of the members of the Genetics Society of Canada; traditionally, these have included agriculture, entomology, genetics/cytogenetics, and evolutionary mechanisms. The contents of the journal have evolved as contributors developed new technologies and interests. A 20-member Editorial Board is composed of scientists from around the world. Reviews and commentary from respected experts are often featured.
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