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A perspective on the evolution of germ-cell development and germinal mosaics of deleterious mutations

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Abstract

In many animals a small number of primordial germ cells (PGCs) are set aside early in development, mitosis and mitochondrial DNA syntheses are arrested, transcription is stopped or reduced, and the PGCs migrate later to the emerging gonads and become germ cells. What could be the evolutionary advantage of sequestering non-dividing PGCs early in development? A commonly cited advantage is a reduction in the number of new deleterious mutations that would occur if there were additional divisions in PGCs early in development. We would like to add to this advantage the fact that these additional mutations in PGCs give rise to germinal mosaics (i.e., premeiotic clusters of mutation) in multiple progeny of the same individual, thus having a larger detrimental effect on the evolutionary fitness of their carriers. Here, we reviewed published studies providing evidence that germinal mosaics of deleterious mutant alleles are not rare, occur for all types of genetic damage, and have been observed in all tested organisms and in nature. We propose the hypothesis that PGC sequestration during early animal development may have evolved in part in response to selection for preventing the occurrence of premeiotic clusters of deleterious mutant alleles, and describe a series of predictions that would allow the assessment of the potential role of germinal mosaics on the evolution of PGC sequestration.

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Acknowledgments

The authors thank James N. Thompson, Jr. for his comments on the manuscript and suggestions, and the Associate Editor and an anonymous reviewer for their constructive suggestions.

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Authors and Affiliations

  1. Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, 43403, USA

    Ronny C. Woodruff, Michael A. Balinski & Juan L. Bouzat

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  1. Ronny C. Woodruff
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  2. Michael A. Balinski
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  3. Juan L. Bouzat
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Correspondence to Ronny C. Woodruff.

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Woodruff, R.C., Balinski, M.A. & Bouzat, J.L. A perspective on the evolution of germ-cell development and germinal mosaics of deleterious mutations. Genetica 143, 563–569 (2015). https://doi.org/10.1007/s10709-015-9854-1

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