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Transgenic Stra8-EYFP pigs: a model for developing male germ cell technologies

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Abstract

The male germ line in mammals is composed of self-renewing cells, spermatogonia, the meiotic spermatocytes and spermiogenic spermatids. Identification of these cell stages in vitro has been problematic. Transgenic animals expressing a marker gene with a promoter specific to certain cell stages in the testis would be a useful approach to identifying these cells in a viable state. Towards this end, we have produced transgenic pigs expressing mitochondrial localized enhanced yellow fluorescent protein (EYFP-mito) under control of the germ cell specific Stimulated by Retinoic Acid 8 (Stra8) promoter. Stra8 has been shown to be expressed in pre-meiotic germ cells of mice. Twelve clones harboring the Stra8-EYFP-mito transgene were produced. Analysis by Western blot indicated that expression of the transgene was limited to testicular tissue in the transgenic pigs. Single cells and seminiferous tubules were cultured in vitro and subsequently examined with epifluorescent microscopy. Expression of EYFP was noted in cells cultured for up to 5 days. Both EYFP-mito and STRA8 antibodies were shown to bind and co-localize in seminiferous tubule cells in whole mounts and in histological sections. EYFP-mito in the transgenic pigs co-localized with the endogenous stem cell marker, NANOG. Expression of the Stra8-EYFP transgene in spermatogenic cells indicates that these pigs will be useful by providing labelled cells for use in such technologies such as germ cell transplantation and in vitro spermatogenic studies.

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Authors and Affiliations

  1. Department of Animal Science, North Carolina State University, Raleigh, NC, 27695-7621, USA

    Jeffrey R. Sommer, Sean G. Simpson, Edwin B. Collins & Robert M. Petters

  2. Department of Biomedical Sciences, North Carolina State University, Raleigh, NC, USA

    Lauren R. Jackson & Jorge A. Piedrahita

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  1. Jeffrey R. Sommer
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  2. Lauren R. Jackson
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  3. Sean G. Simpson
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  4. Edwin B. Collins
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  5. Jorge A. Piedrahita
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  6. Robert M. Petters
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Correspondence to Robert M. Petters.

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Sommer, J.R., Jackson, L.R., Simpson, S.G. et al. Transgenic Stra8-EYFP pigs: a model for developing male germ cell technologies. Transgenic Res 21, 383–392 (2012). https://doi.org/10.1007/s11248-011-9542-6

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  • DOI: https://doi.org/10.1007/s11248-011-9542-6

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