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Haploid genome reactivation and recovery by cell hybridization

Induction of DNA synthesis in spermatid nuclei

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Abstract

DNA replication in haploid spermatid nuclei has been induced by hybridization of mouse early spermatids to proliferating HeLa cells. Use of polyethylene glycol rather than inactivated Sendai virus as the cell fusion agent was found to be essential to the production of large numbers of heterokaryons containing spermatid nuclei. DNA replication was detected in the heterokaryons by autoradiography. Density of silver grains over spermatid nuclei closely approximated the grain density over labelled HeLa nuclei in the same heterokaryons. Mouse centromeric heterochromatin appeared to be labelled last during the spermatid DNA synthetic period. On the average, HeLa nuclei in heterokaryons began DNA synthesis before spermatid nuclei. Results indicated, however, that DNA synthesis by HeLa nuclei might not be a prerequisite for spermatid DNA synthesis. These experiments demonstrate induction of DNA synthesis in spermatid nuclei, the first major step toward reactivation and recovery of their haploid genome by cell hybridization.

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  1. Department of Biology, Kline Biology Tower, Yale University, 06520, New Haven, Connecticut, USA

    S. M. Elsevier & F. H. Ruddle

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  1. S. M. Elsevier
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  2. F. H. Ruddle
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Elsevier, S.M., Ruddle, F.H. Haploid genome reactivation and recovery by cell hybridization. Chromosoma 56, 227–241 (1976). https://doi.org/10.1007/BF00293187

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  • DOI: https://doi.org/10.1007/BF00293187

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