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Detection of sex chromosome aneuploidy in dog spermatozoa by triple color fluorescence in situ hybridization


Detection of sex chromosome aneuploidy in dog spermatozoa by triple color fluorescence in situ hybridization



Theriogenology 82(4): 652-656



ISSN/ISBN: 0093-691X

PMID: 24962971

DOI: 10.1016/j.theriogenology.2014.05.018

With the development of a direct visualization of sex chromosome in a single sperm by fluorescence in situ hybridization (FISH) technique, the frequency of aberration (aneuploidy) in spermatozoa in several mammals has been investigated. However, there is no report in the incidence of X-Y aneuploidy in the sperm population of dogs. Therefore, in this study, the aneuploidy in dog spermatozoa was examined by multicolor FISH using specific molecular probes for canine sex chromosomes and autosome. Semen from eight male Labrador retrievers was used as specimen. For decondensation of sperm nuclei, the specimen was treated with 1 M NaOH for 4 minutes at room temperature. Probes for chromosomes X, Y, and 1, labeled with SpectrumGreen, Cy3 and Cy5, respectively, were hybridized with decondensed spermatozoa. Fluorescence in situ hybridization signals in sperm heads were clearly detected in each specimen, regardless of the sperm donor. The FISH signal of at least one of the three probes was detected in all sperm heads examined. There was no significant difference between the theoretical ratio (50:50) and the observed ratio of X and Y chromosomes in spermatozoa of all the eight dogs. Mean percentage of sex chromosome aneuploidy was 0.127% (ranged between 0% and 0.316%). This percentage of canine sex chromosome aneuploidy was lower than the one reported in cattle, horses, river buffalo, and goats sperm, but higher than that observed in mice and sheep.

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Accession: 052523692

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