Centromeric asymmetry and induction of translocations and sister chromatid exchanges in mouse chromosomes.
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Biomedical subjects
Publications and source records attributed to M S Lin.
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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.
A fluorescent staining technique has demonstrated a contralateral arrangement of fluorescent spots in the centromeric region of mouse metacentric chromosomes which have resulted from centric fusion. The results suggest that centric fusion involves the maintenance of DNA polaritv through the centromere and that the thymidine-rich chain of satellite DNA in the centromeric region is associated with the same DNA chain in every mouse autosome.
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