Abstract
On the basement of the library model of satellite DNA evolution is the differential amplification of subfamilies through lineages diversification. However, this idea has rarely been explored from an experimental point of view. In the present work, we analyzed copy number and sequence variability of RPCS (repetitive PvuII Ctenomys sequence), the major satellite DNA present in the genomes of the rodents of the genus Ctenomys, in a closely related group of species and forms inhabiting the Iberá marsh in Argentina. We studied the dependence of these two parameters at the intrapopulation level because in the case of interbreeding genomes, differences in RPCS copy number are due to recent amplification/contraction events. We found an inverse relationship among RPCS copy number and sequence variability: amplifications lead to a decrease in sequence variability, by means of biased homogenization of the overall satellite DNA, prevailing few variants. On the contrary, the contraction events that involve tandems of homogeneous monomers contribute—by default—minor variants to become “evident”, which otherwise were undetectable. On the other hand, all the RPCS sequence variants are totally or partially shared by all the studied populations. As a whole, these results are comprehensible if these RPCS variants preexisted in the common ancestor of this Ctenomys group.
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Acknowledgments
This work was supported by grants from the Agencia Nacional de Investigaciones Científicas y Técnicas (PICT 3836/1) and Consejo Nacional de Investigaciones Científicas y Técnicas (PIP 5776) from Argentina. D.A.C. is supported by a doctoral fellowship awarded by CONICET. M. S. R. is career investigator of the CONICET. We would like to thank Mercedes Goin and Diana Avedikian, and also three anonymous reviewers for their comments on the first version of the manuscript. We also would like to thank Thales R. de Freitas, María Jimena Gómez Fernandez, Marcelo Kittlien, Fernando Mapelli, Patricia Mirol, Matías Mora, Vanina Raimondi, Verónica Trucco Cano and Laura Wolfenson for assistance at the fieldwork.
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Caraballo, D.A., Belluscio, P.M. & Rossi, M.S. The library model for satellite DNA evolution: a case study with the rodents of the genus Ctenomys (Octodontidae) from the Iberá marsh, Argentina. Genetica 138, 1201–1210 (2010). https://doi.org/10.1007/s10709-010-9516-2
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DOI: https://doi.org/10.1007/s10709-010-9516-2