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The cryptic Y-autosome translocation in the small Indian mongoose, Herpestes auropunctatus, revealed by molecular cytogenetic approaches

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Abstract

In initial studies of the eutherian small Indian mongoose (Herpestes auropunctatus), the Y chromosome could not be identified in somatic cells. The male chromosome number is uniquely odd, 2n = 35, whereas that of females is 2n = 36. Previous reports indicated that this unique karyotype resulted from a translocation of the ancestral Y chromosome to an autosome. However, it has been difficult to identify the chromosomes that harbor the translocated Y chromosomal segment because it is an extremely small euchromatic region. Using a Southern blot analysis, we detected four conserved Y-linked genes, SRY, EIF2S3Y, KDM5D, and ZFY, in the male genome. We cloned homologues of these genes and determined their sequences, which showed high homology to genes in two carnivore species, cat and dog. To unambiguously identify the Y-bearing autosome, we performed immunostaining of pachytene spermatocytes using antibodies against SYCP3, γH2AX, and the centromere. We observed trivalent chromosomes, and the associations between the distal ends of the chromosomes were consistent with those of Y and X1 chromosomes. The centromere of the Y chromosome was located on the ancestral Y chromosomal segment. We mapped the complementary DNA (cDNA) clones of these genes to the male chromosomes using fluorescence in situ hybridization (FISH), and the linear localization of all genes was confirmed by two-colored FISH. These Y-linked genes were localized to the proximal region of the long arm of a single telomeric chromosome, and we successfully identified the chromosome harboring the ancestral Y chromosomal segment.

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Acknowledgments

The authors thank S. Ishishita, K. Matsubara, and Yoichi Matsuda for their advice on the drying-down technique and cell culture. We also thank C. Nishida-Umehara and T. Kudo for preparing chromosomes and collecting data and S. Abe for the kind help with sampling.

Authors’ contribution

CM conducted molecular experiments and immunostaining. FS contributed to the majority of the cytogenetic experiments and Southern blot analysis. FY and KN captured animals and performed sampling. II commented on the final version of the paper. AK designed the study and analyzed the data, and wrote the manuscript. All authors discussed the results and approved the final version of the manuscript.

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Correspondence to Asato Kuroiwa.

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All the animal experiments in this study were approved by Institutional Animal Care and Use Committee of National University Corporation Hokkaido University and were performed in accordance with the Guidelines for the Care and Use of Laboratory Animals, Hokkaido University. This article does not contain any studies on human participants by any of the authors.

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The authors declare that they have no competing interests.

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Murata, C., Sawaya, H., Nakata, K. et al. The cryptic Y-autosome translocation in the small Indian mongoose, Herpestes auropunctatus, revealed by molecular cytogenetic approaches. Chromosoma 125, 807–815 (2016). https://doi.org/10.1007/s00412-015-0572-3

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