First reports of XXY aneuploidy in natural populations of Thomas’ pine vole Microtus thomasi (Rodentia: Arvicolidae) from Greece

As part of an extensive cytological study in natural populations of Thomas’ pine vole Microtus thomasi, two cases of XXY aneuploidy (2 n=45, FN=47) from different localities of NW Peloponnesus, Greece were recently recorded. These constitute the first report of sex chromosome aneuploidy for this spe...

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Published inMammalian biology : Zeitschrift für Säugetierkunde Vol. 73; no. 5; pp. 342 - 349
Main Authors Rovatsos, Michail Th, Mitsainas, George P., Stamatopoulos, Costas, Giagia-Athanasopoulou, Eva B.
Format Journal Article
LanguageEnglish
Published Cham Elsevier GmbH 01.01.2008
Springer International Publishing
Subjects
Animal Anatomy
Animal Ecology
Animal Systematics/Taxonomy/Biogeography
asynaptic
Evolutionary Biology
Fish & Wildlife Biology & Management
Histology
Kleinefelter's syndrome
Life Sciences
male sterility
Microtus thomasi
Morphology
Original Investigation
sex chromosomes
Zoology
Microtus thomasi
sex chromosomes
Kleinefelter's syndrome
male sterility
asynaptic
Kleinefelter’s syndrome
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Summary:As part of an extensive cytological study in natural populations of Thomas’ pine vole Microtus thomasi, two cases of XXY aneuploidy (2 n=45, FN=47) from different localities of NW Peloponnesus, Greece were recently recorded. These constitute the first report of sex chromosome aneuploidy for this species, in a sample of 366 individuals from 89 localities of Greece. Both individuals appeared with a male phenotype and normal morphology; however, measurements and histological examination in the testes of one of the two individuals imply a severely impaired fertility. The above findings translate to a relatively high rate of sex chromosome aneuploidy (0.55%) (upper 95% CI 1.96%) for the natural populations of Microtus thomasi and possible reasons for this are discussed. Erster Bericht über die XXY-Aneuploidie in freilebenden Populationen der Balkan-Kurzohrmaus Microtus thomasi (Rodentia: Arvicolidae) aus Griechenland . In umfangreichen cytogenetischen Untersuchungen freilebender Populationen von Microtus thomasi haben wir zwei Beispiele von XXY-Aneuploidie (2 n=45, FN=47) an verschiedenen Lokalitäten im Nordwesten der Peloponnes (Griechenland) gefunden. Es handelt sich um den ersten Bericht von Geschlechtschromosomen-Aneuploidie dieser Art. Beide Tiere präsentierten sich mit normalem Phänotyp und Morphologie, obwohl Messungen und histologische Hodenuntersuchungen bei einem der zwei Tiere eine sehr beschränkte Fertilität andeuteten. Aus diesen Ergebnissen geht eine relativ hohe Frequenz von Geschlechtschromosomen-Aneuploidie (0.55%) für freilebende Populationen von M. thomasi hervor. Einige mögliche Grunde dafür werden diskutiert.
ISSN:1616-5047
1618-1476
DOI:10.1016/j.mambio.2007.10.010