Summary
Amounts of desoxyribose nucleic acid (DNA) in individual liver nuclei were determined microspectrophotometrically for 37 humans ranging in age from 2 weeks to 90 years. It was found that:
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1.
Until the age of about 6 the liver contains only diploid (2DNA) nuclei.
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2.
During the years 6–10 there is evidence of DNA synthesis in some nuclei.
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3.
During the years 11–14 a definite tetraploid (4DNA) class is established and until the age of about 20 the liver contains diploid and tetraploid nuclei.
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4.
At about the age of 20 an octaploid (8DNA) class is established and all three DNA classes coexist in the liver until death.
It is concluded that:
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1.
The growth phase of the human liver at puberty can be explained, at least in part, as growth by the formation of polyploid cells as opposed to growth by mitosis.
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2.
The data presented are consistent with the hypothesis that the development of polyploidy in mammalian organs is dependent on the anterior pituitary growth hormone.
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Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Biology, Western Reserve University.
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Swartz, F.J. The development in the human liver of multiple desoxyribose nucleic acid (DNA) classes and their relationship to the age of the individual. Chromosoma 8, 53–72 (1956). https://doi.org/10.1007/BF01259493
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DOI: https://doi.org/10.1007/BF01259493