A COMPARISON OF HETEROCHROMATIC REGIONS IN THREE SPECIES OFNEOTROPICAL CANIDS

ZURANO JUAN P.; OJEDA DIEGO S; BIDAU CLAUDIO J.; MOLINA WAGNER F.; LEDESMA MARIO A; MARTINEZ PABLO A.

ZOOLOGISCHER ANZEIGER

ELSEVIER GMBH

Año: 2015 vol. 254 p. 1 - 7

0044-5231

tRepetitive DNA varies in nature and abundance, and has had an important role in genome evolutionof higher eukaryotes. In the present study we analyzed the dynamics of heterochromatic regions andtelomeric sequences in three endemic South American canid species, Chrysocyon brachyurus, Lycalopexgymnocercus, and two subspecies of Cerdocyon thous by means of C-banding and fluorescence in situhybridization (FISH) with telomeric probes. The three species revealed different banding patternsevidencing amplifications of centromeric heterochromatic and telomeric regions co-localized with telom-eric sequences in L. gymnocercus and C. thous, and the presence of a heterochromatic terminal block inthe Y chromosome of C. brachyurus. Additionally, an unusual heteromorphism of chromosome pair 1 wasobserved in the subspecies Cerdocyon thous entrerrianus. Our work emphasizes the importance of cyto-genetic studies at the population level comprising the largest possible area of the geographic distributionof the species.