Abstract
The terminal phase of DNA replication was studied by autoradiography in hybrids between human lymphocytes and mouse fibroblasts. The hybrids contained on the average only 11 human chromosomes. It was found that the sequence of terminal DNA replication for the human chromosomes in the hybrids was the same as the sequence of terminal replication for the corresponding chromosomes in the human lymphocytes. Furthermore, it was shown that the maintenance of the normal terminal replication sequence of the human chromosomes in the hybrids was not dependent on the presence of any specific human chromosome. The results suggest that the timing of terminal DNA replication is determined independently in each human chromosome.
Similar content being viewed by others
Literature cited
Gilbert, C. W., Muldal, S., Lajtha, L. G., and Rowley, J. (1962).Nature 195:869–873.
German, J. (1964).J. Cell Biol. 20:37–55.
Gavosto, F., Pegoraro, L., Masera, P., and Rovera, G. (1968).Exp. Cell. Res. 49:340–358.
Takagi, N., and Sandberg, A. A. (1968).Cytogenetics 7:135–143.
Weiss, M., and Green, H. (1967).Proc. Natl. Acad. Sci. 58:1104–1111.
Littlefield, J. (1964).Science 145:709.
Davidson, R. L., and Ephrussi, B. (1965).Nature 205:1170–1171.
Caspersson, T., Zech, L., Johansson, C., and Modest, E. J. (1970).Chromosoma 30:215–227.
Gallimore, P. H., and Richardson, C. R. (1973).Chromosoma 41:259–263.
1971 Paris Conference (1972).Standardization in Human Cytogenetics, Birth Defects: Original Article Series, Vol. VIII, The National Foundation, New York, p. 7.
Rao, P. N., and Johnson, R. T. (1971).Nature 225:159–164.
Slezinger, S. I., and Prokofieva-Belgovskaya, A. A. (1968).Cytogenetics 7:337–346.
German, J., and Aronian, D. (1971).Chromosoma 35:99–110.
Sonnenschein, C. (1970).Exp. Cell Res. 63:195–199.
Graves, J. A. M. (1972).Exp. Cell Res. 73:81–94.
Marin, G., and Colletta, G. (1975).Exp. Cell Res., in press.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lin, M.S., Davidson, R.L. Replication of human chromosomes in human-mouse hybrids: Evidence that the timing of DNA synthesis is determined independently in each human chromosome. Somat Cell Mol Genet 1, 111–122 (1975). https://doi.org/10.1007/BF01538735
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01538735