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Uptake and early fate of metaphase chromosomes ingested by the Wi-L2 human lymphoid cell line

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Somatic Cell Genetics

Abstract

Aspects of the ingestion and early intracellular fate of homologous, [3H]-thymidine-labeled chromosomes (donor) were studied in recipient Wi-L2 cells in the absence of reutilized radioactivity. As much as 67% of the cell-associated radioactivity was resistant to hydrolysis by DNase I after 4 h of incubation. Cell fractionation and electron microscope autoradiography indicated that chromosome uptake was rapid, into both cytoplasmic and nuclear fractions and was facilitator and dose dependent. Sedimentation analysis demonstrated that at 4 h donor DNA of approximate single-strand mol wt of 1–6×106, as compared to 6–12× 106 for chromosomal DNA, was recoverable in cell fractions. By 6 h, a significant portion of the nucleus-associated donor DNA was converted into material of higher mol wt, although no evidence was found for integration into recipient DNA, Cytoplasmic donor DNA continued to be degraded. An average number of chromosome equivalents of nucleusassociated donor DNA to recipient cell nuclei of 1–4 was obtained and its relationship to the lower frequency of chromosome-mediated gene transfer is discussed.

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Author notes

  1. T. Simmons

    Present address: Division of Life Sciences, Polytechnic Institute of New York, 11201, Brooklyn, New York

Authors and Affiliations

  1. Department of Human Genetics, Yale University School of Medicine, 06510, New Haven, Connecticut

    T. Simmons, M. Lipman & L. D. Hodge

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  2. M. Lipman
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  3. L. D. Hodge
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Simmons, T., Lipman, M. & Hodge, L.D. Uptake and early fate of metaphase chromosomes ingested by the Wi-L2 human lymphoid cell line. Somat Cell Mol Genet 4, 55–76 (1978). https://doi.org/10.1007/BF01546493

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  • DOI: https://doi.org/10.1007/BF01546493

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