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Protein immunolocalization supports the presence of identical mechanisms of XY body formation in eutherians and marsupials

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Abstract

The meiotic sex chromosomes of the American marsupials Monodelphis dimidiata and Didelphis albiventris were studied with electron microscopy (EM) and with immunofluorescence localization of meiotic proteins SYCP1 and SYCP3, and proteins essential for meiotic sex chromosome inactivation (MSCI), γ-H2AX and BRCA1. The chromatin of the non-synaptic X and Y chromosomes contains γ-H2AX, first as foci and then as homogeneous staining at late stages. The thick and split X and Y axes are labelled with BRCA1 except at one terminus. The bulgings of the axes contain SYCP1 as well as the inner side of the dense plate. The evenly spaced and highly packed chromatin fibres of the conjoined XY body in these species have the same behaviour and the same components (γ-H2AX in the chromatin, BRCA1 in the axes) as in the XY body of eutherian species. These observations and recent data from the literature suggest that XY body formation is ancestral to the metatherian–eutherian divergence.

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  1. CIR, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, Buenos Aires, PC C1121ABG, Argentina

    M. J. Franco, R. B. Sciurano & A. J. Solari

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  1. M. J. Franco
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  2. R. B. Sciurano
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  3. A. J. Solari
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Correspondence to A. J. Solari.

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Franco, M.J., Sciurano, R.B. & Solari, A.J. Protein immunolocalization supports the presence of identical mechanisms of XY body formation in eutherians and marsupials. Chromosome Res 15, 815–824 (2007). https://doi.org/10.1007/s10577-007-1165-7

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  • DOI: https://doi.org/10.1007/s10577-007-1165-7

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